JP7021540B2 - Awareness-based optometry device - Google Patents

Description

The present disclosure relates to a subjective optometry device that subjectively measures the optical characteristics of an eye to be inspected.

As a subjective optometry device, an optical member (for example, a spherical lens, a cylindrical lens, etc.) is arranged in front of the subject's eye, and an inspection target is presented via the optical member, whereby the optical characteristics of the optometry object are exhibited. Those that measure (optical power) are known (see Patent Document 1).

Japanese Unexamined Patent Publication No. 5-176893

By the way, in the subjective measurement, optical aberration is generated from each member constituting the subjective optometry device. The generated optical aberration changes depending on the measurement conditions (for example, ocular refractive power, inspection distance, convergence angle, etc.). Optical aberrations also occur due to the refractive power (optical characteristics) of the eye to be inspected. For this reason, complicated optical aberrations occur, and it may not be possible to accurately measure the optical measurement of the eye to be inspected.

In view of the above-mentioned prior art, it is a technical subject of the present disclosure to provide a subjective optometry apparatus capable of correcting optical aberrations and accurately measuring the optical characteristics of an eye to be inspected.

In order to solve the above problems, the present invention is characterized by having the following configurations.

The subjective eye examination device according to the present disclosure includes a light projecting optical system that projects the target light beam toward the eye to be inspected, and a correction that is arranged in the optical path of the light projecting optical system and changes the optical characteristics of the target light beam. It has an optical system and an optical member that guides the target light beam corrected by the correction optical system to the eye to be inspected, and includes a subjective measuring means for subjectively measuring the optical characteristics of the eye to be inspected. A subjective eye inspection device that corrects a third optical aberration component based on a first optical aberration component generated by the subjective measurement means and a second optical error component generated by the optical characteristics of the eye to be inspected. A setting means for setting a correction amount for the purpose, a correction means for correcting the third optical aberration component based on the correction amount, and the visual target generated by the correction means correcting the third optical aberration component. It is characterized by comprising a distortion correction means for correcting the distortion of the light beam .

It is an external view of the subjective optometry apparatus which concerns on this Example. It is a figure explaining the structure of the measuring means. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus from the front direction. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus from the side direction. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus from the top surface direction. It is a figure which shows the control system of the subjective optometry apparatus. It is a figure which shows the anterior eye part image of the eye to be inspected. It is a figure explaining alignment control. It is a figure explaining the correction amount for correcting a synthetic astigmatism component. It is a figure explaining the relative angle and the rotation angle of a cylindrical lens. It is a figure explaining the distortion of an optotype luminous flux. It is a figure explaining the correction of the distortion of an optotype luminous flux. It is a figure which shows the change of the correction amount set for correcting a synthetic astigmatism component.

<Overview>
The subjective optometry apparatus according to the embodiment of the present disclosure will be described. In the following, the depth direction (front-back direction of the subject) of the subjective eye examination device is the Z direction, the horizontal direction on the plane perpendicular to the depth direction (the left-right direction of the subject) is the X direction, and the plane perpendicular to the depth direction. The upper vertical direction (vertical direction of the subject) will be described as the Y direction. Further, in the following, L and R attached to the reference numerals will be described as indicating for the left eye to be inspected (for the left eye) and for the right eye to be inspected (for the right eye), respectively. The items classified by <> can be used independently or in relation to each other.

For example, the optometry device (for example, the optometry device 1) may include a conscious measuring means for consciously measuring the optical characteristics of the eye to be inspected. Further, for example, the subjective optometry apparatus may include an objective measuring means for objectively measuring the optical characteristics of the eye to be inspected. Of course, the subjective optometry device may be configured to include both a subjective measuring means and an objective measuring means. For example, the optical characteristics of the eye to be inspected include optical power (for example, at least one of spherical power, columnar power, astigmatic axis angle, etc.), contrast sensitivity, binocular vision function (for example, oblique amount, stereoscopic function). , Etc.), etc. may be at least one of them.

For example, the subjective optometry apparatus 1 may include a floodlight optical system (for example, a floodlight optical system 30). For example, the projection optical system projects a target beam toward the eye to be inspected and projects the target to the eye to be inspected. Further, for example, the subjective optometry apparatus may include a corrective optical system (for example, a corrective optical system 60, a subjective measurement optical system 25). For example, the correction optical system is arranged in the optical path of the projection optical system and changes the optical characteristics of the target luminous flux. Further, for example, the subjective optometry device may include an optical member (for example, a concave mirror 85) that guides the optotype light flux corrected by the correction optical system to the eye to be inspected.

For example, in the subjective optometry device 1, the target luminous flux may be guided to the eye to be inspected by passing through an optical path corresponding to the optical axis of the optical member. That is, the subjective measuring means may be configured to subjectively measure the optical characteristics of the eye to be inspected by guiding the luminous flux of the optotype passing through the optical path corresponding to the optical axis of the optical member to the eye to be inspected. .. Further, for example, in the subjective optometry device 1, the target luminous flux may be guided to the eye to be inspected by passing through a path deviating from the optical axis of the optical member. That is, the subjective measurement means may be configured to subjectively measure the optical characteristics of the eye to be inspected by guiding the luminous flux of the optotype that has passed through a path off the optical axis of the optical member to the eye to be inspected. ..

<Light projection optical system>
For example, the projection optical system has a light source (for example, a display 31) that irradiates a target luminous flux. Further, for example, the projection optical system may have at least one or more optical members that guide the target luminous flux projected from the light source that irradiates the target luminous flux toward the eye to be inspected. For example, a display may be used as the light source for projecting the luminous flux. For example, as a display, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), or the like is used. For example, an inspection target such as a Randold ring optotype is displayed on the display. Further, for example, a light source and a DMD (Digital Micromirror Device) may be used as the light source for projecting the luminous flux. In general, DMD has high reflectance and is bright. Therefore, the amount of light of the target luminous flux can be maintained as compared with the case of using a liquid crystal display using polarization.

For example, the light source for projecting the luminous flux may be configured to include a visible light source for presenting an optotype and an optotype plate. In this case, for example, the optotype is a rotatable disc plate and has a plurality of optotypes. For example, the plurality of optotypes include a visual acuity test optotype used at the time of subjective measurement. For example, as a visual acuity test target, visual acuity values (visual acuity values 0.1, 0.3, ..., 1.5) for each visual acuity value are prepared. For example, the optotype plate is rotated by a motor or the like, and the optotypes are switched and arranged on an optical path in which the optotype light flux is guided to the eye to be inspected. Of course, as the light source for projecting the luminous flux, a light source other than the above configuration may be used.

For example, the projection optical system may include a pair of left and right eye projection optical systems and a right eye projection optical system. For example, in the projection optical system for the left eye and the projection optical system for the right eye, the member constituting the projection optical system for the left eye and the member constituting the projection optical system for the right eye are the same members. It may be configured. Further, for example, the left-eye projection optical system and the right-eye projection optical system are at least one in a member constituting the left-eye projection optical system and a member constituting the right-eye projection optical system. The members of the portions may be composed of different members. Further, for example, the left-eye projection optical system and the right-eye projection optical system are at least one in a member constituting the left-eye projection optical system and a member constituting the right-eye projection optical system. It may be configured so that the members of the parts are also used. Further, for example, in the left-eye projection optical system and the right-eye projection optical system, a member constituting the left-eye projection optical system and a member constituting the right-eye projection optical system are separately provided. It may be provided.

<Correcting optical system>
For example, the correction optical system may be configured to change the optical characteristics of the visual target light flux (for example, at least one of spherical power, cylindrical power, astigmatic axis angle, polarization characteristics, optical aberration, and the like). For example, the configuration for changing the optical characteristics of the luminous flux may be a configuration for controlling an optical element. For example, the optical element may be configured to use at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, and the like. Of course, for example, as the optical element, an optical element different from the above-mentioned optical element may be used.

For example, the correction optical system may be configured to correct the spherical power of the eye to be inspected by optically changing the presentation position (presentation distance) of the optotype with respect to the eye to be inspected. In this case, for example, the configuration for optically changing the presentation position (presentation distance) of the optotype may be a configuration in which the light source (for example, the display) is moved in the optical axis direction. Further, for example, as a configuration for optically changing the presentation position (presentation distance) of the optotype, an optical element (for example, a spherical lens) arranged in the optical path may be moved in the optical axis direction. .. Of course, the correction optical system may have a configuration in which a configuration for controlling the optical element and a configuration for moving the optical element arranged in the optical path in the optical axis direction are combined.

For example, as a correction optical system, an optical element is arranged between an optical member for guiding a target light beam from the projection optical system toward the eye to be inspected and a light source of the projection optical system, and optical light is provided. The optical characteristics of the target light beam may be changed by controlling the element. That is, as the correction means, a phantom lens refractometer (phantom correction optical system) may be configured. In this case, for example, the target luminous flux corrected by the correction optical system is guided to the eye to be inspected via the optical member.

For example, the corrective optical system may have a pair of left and right corrective optical systems for the left eye and a corrective optical system for the right eye. For example, the correction optical system for the left eye and the correction optical system for the right eye are composed of the same member as the member constituting the correction optical system for the left eye and the member constituting the correction optical system for the right eye. It is also good. Further, for example, in the correction optical system for the left eye and the correction optical system for the right eye, at least a part of the members constituting the correction optical system for the left eye and the member constituting the correction optical system for the right eye is used. It may be composed of different members. Further, for example, in the correction optical system for the left eye and the correction optical system for the right eye, at least a part of the members constituting the correction optical system for the left eye and the member constituting the correction optical system for the right eye is used. It may be a configuration that is also used. Further, for example, the correction optical system for the left eye and the correction optical system for the right eye have a configuration in which a member constituting the correction optical system for the left eye and a member constituting the correction optical system for the right eye are separately provided. There may be.

<Optical member>
For example, an optical member that guides an optotype beam corrected by a correction optical system to an eye to be inspected guides the optotype or an image of the optotype to the eye to be inspected optically at a predetermined inspection distance. It may be an optical member. For example, a concave mirror may be used as the optical member. Of course, the optical member may be configured to lightly guide the target luminous flux or the image of the target luminous flux to the eye to be inspected so as to optically reach a predetermined inspection distance, and is not limited to the concave mirror. For example, in this case, at least one of a lens, a plane mirror, and the like may be used as the optical member.

<Correction of optical aberration component>
For example, the subjective optometry device may include setting means (for example, a control unit 70). For example, the setting means is a correction amount for correcting the third optical aberration component based on the first optical aberration component generated by the subjective measuring means and the second optical aberration component generated by the optical characteristics of the eye to be inspected. To set. For example, in this embodiment, as the third optical aberration component, a correction amount for correcting the synthetic optical aberration component in which the first optical aberration component and the second optical aberration component are combined may be set. .. Further, for example, in the present embodiment, as the third optical aberration component, a correction amount for correcting the first optical aberration component and the second optical aberration component may be set. For example, such optical aberration may be at least one of spherical aberration, astigmatism, coma, curvature of field, distortion, chromatic aberration, and the like. Further, for example, such an optical aberration component may be at least one of the direction of the optical aberration, the amount (magnitude) of the optical aberration, and the like.

For example, in the subjective optometry device of the present embodiment, the astigmatism component generated by the subjective measuring means (for example, the first astigmatism component 111) and the astigmatism component generated by the optical characteristics of the eye to be inspected (for example, for example). , The second astigmatism component 222) and the correction amount for correcting the astigmatism component (for example, the third astigmatism component 333) based on the above are set. Further, for example, in the subjective optometry apparatus according to the present embodiment, the direction of the astigmatism component and the amount of the astigmatism component are corrected respectively.

For example, the setting means is configured to set the correction amount by using a correction table previously stored in a memory (for example, memory 75) for acquiring a correction amount for correcting the third optical aberration component. There may be. Further, for example, the setting means may be configured to set the correction amount by using an arithmetic expression for calculating the correction amount for correcting the third optical aberration component, which is stored in the memory in advance. For example, such a correction table and an arithmetic expression may be created by conducting an experiment or a simulation in advance.

For example, the subjective optometry device may include correction means (for example, astigmatism correction optical system 63). For example, the correction means corrects the third optical aberration component based on the correction amount for correcting the third optical aberration component. This makes it possible to reduce the optical aberration component generated during the subjective measurement and accurately measure the optical characteristics of the eye to be inspected.

<When correcting the synthetic optical aberration component as the third optical aberration component>
For example, the setting means sets a correction amount for correcting the synthetic optical aberration component in which the first optical aberration component and the second optical aberration component are combined as the correction amount for correcting the third optical aberration component. You may. In this case, the correction means corrects the third optical aberration component by correcting the synthetic optical aberration component based on the correction amount for correcting the synthetic optical aberration component. As a result, it is not necessary to set each correction amount for each optical aberration component, and the third optical aberration component can be easily corrected.

For example, in the case of such a configuration, the correction means may also use the correction optical system, and the third optical aberration component may be corrected by changing the correction power of the correction optical system. In other words, the third optical aberration component may be corrected by the correction optical system. As a result, the third optical aberration component can be corrected with a simple configuration without requiring complicated control. The correction means is not limited to a configuration that also serves as a correction optical system, and may be any configuration that can correct the third optical aberration component. That is, for example, the correction means may be configured not to also use the correction optical system but also to use the correction optical system (for example, the correction optical system 90). Further, for example, the correction means may not be used in combination with the correction optical system or the correction optical system, but may be configured to separately provide an optical system for correcting the third optical aberration component.

<When correcting the first optical aberration component and the second optical aberration component as the third optical aberration component, respectively>
For example, the setting means sets, as a correction amount for correcting the third optical aberration component, a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component, respectively. It may be set. This makes it possible to set the correction amount according to each optical aberration component. That is, the correction amount can be set for each of the first optical aberration component and the second optical aberration component. With such a configuration, for example, it is possible to set a correction amount for the first optical aberration component and not set a correction amount for the second optical aberration component.

For example, when the setting means sets the correction amount for each of the first optical aberration component and the second optical aberration component to set the correction amount for correcting the third optical aberration component, the correction means is the first. The third optical aberration component may be corrected by performing the correction based on both the correction amount for correcting the optical aberration component and the correction amount for correcting the second optical aberration component. .. In this case, the correction means may also be used as a correction optical system. That is, a correction based on a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component using one correction unit (for example, an astigmatism correction optical system). May be done. This makes it possible to simplify the configuration of the device as compared with the case where a plurality of correction units are used.

Of course, the correction means also serves as a correction optical system, and by using the correction optical system, a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component can be obtained. You may make corrections based on this. Further, the correction means also uses an optical system separately provided for correcting the first optical aberration component and the second optical aberration component, and by using this optical system, the first optical aberration component can be corrected. Correction may be performed based on the correction amount and the correction amount for correcting the second optical aberration component.

Further, for example, when the setting means sets the correction amount for each of the first optical aberration component and the second optical aberration component to set the correction amount for correcting the third optical aberration component, the correction means may be used. The first correction means (for example, an optics correction optical system) that makes a correction based on the correction amount for correcting the first optical aberration component, and the correction amount based on the correction amount for correcting the second optical aberration component are performed. A second correction means (for example, a correction optical system) may be provided, and the first correction means and the second correction means may be used to correct the third optical aberration component. That is, by using the two correction units, correction may be performed based on a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component. As a result, each optical aberration component can be corrected separately. For example, the first optical aberration component can be corrected and the second optical aberration component cannot be corrected.

In the case of such a configuration, the first optical aberration component and the second optical aberration component may be corrected by using different correction means, and the first correction means and the second correction means are the present embodiment. It is not limited to the combination exemplified in. For example, a correction optical system may be used as the first correction means, and an astigmatism correction optical system may be used as the second correction means. Further, for example, an optical system for correcting the first optical aberration component and an optical system for correcting the second optical aberration component are separately provided, and the respective are used as the first correction means and the second correction means. It may be. Of course, an astigmatism correction optical system may be used as the first correction means, and a separately provided optical system may be used as the second correction means.

<Correction of distortion in the luminous flux>
For example, the subjective optometry device may include distortion correction means (for example, a control unit 70). For example, the distortion correction means corrects the distortion of the luminous flux generated by the correction means correcting the third optical aberration component. As a result, it is possible to perform subjective measurement with the distortion of the luminous flux reduced and to accurately acquire the optical characteristics of the eye to be inspected.

For example, the distortion correction means may correct at least a part of the distortion of the luminous flux, or may correct the entire distortion of the luminous flux. For example, the distortion correction means may be configured to correct the distortion of the luminous flux of the optotype by deforming the optotype displayed on the display (for example, the display 31). In this case, for example, the projection optical system may have a display, and the optotype may be emitted by displaying the optotype on the display.

When making corrections using a display, for example, the correction means may change the vertical size of the optotype displayed on the display. Further, for example, the correction means may change the lateral size of the optotype displayed on the display. Further, for example, the correction means may move the optotype in the optotype displayed on the display. That is, the correction means may be configured to perform at least one of processing of changing the vertical size of the optotype displayed on the display, changing the size in the horizontal direction, and moving the optotype. For example, the distortion of the luminous flux of the optotype can be easily corrected by the configuration of deforming the optotype displayed on the display.

Further, for example, the distortion correcting means may be configured to correct the distortion of the luminous flux by controlling the driving means and moving the optical member. In this case, for example, the projectile optical system may be configured to include a mobile optical member that can move in the optical path of the projectile optical system and a driving means that moves the mobile optical member in the optical path of the projectile optical system. .. For example, as the moving optical member, a lens, a prism, a mirror, or the like may be used. Further, for example, as the moving optical member, any optical member of the floodlight optical system may be used, or a different member provided separately from the optical member of the floodlight optical system may be used. For example, the distortion of the luminous flux can be corrected with high accuracy by controlling the driving means to move the optical member.

<Example>
Examples of the present disclosure will be described with reference to FIGS. 1 to 13. FIG. 1 is an external view of the subjective optometry device 1 according to the present embodiment. For example, the subjective optometry device 1 includes a housing 2, a presentation window 3, a monitor (display) 4, a chin rest 5, a base 6, an anterior eye imaging optical system 100, and the like. For example, the housing 2 includes a measuring means 7 inside the housing 2 (details will be described later). For example, the presentation window 3 is used to present a target to the subject. For example, the target luminous flux from the measuring means 7 is projected onto the eye E of the subject through the presentation window 3.

For example, the monitor 4 displays the optical characteristic result of the eye E to be inspected (for example, spherical power, cylindrical power, astigmatic axis angle, etc.). For example, the monitor 4 is a touch panel. That is, in this embodiment, the monitor 4 functions as an operation unit (controller). For example, the signal corresponding to the operation instruction input from the monitor 4 is output to the control unit 70 described later. The monitor 4 does not have to be a touch panel type, and the monitor 4 and the operation unit may be provided separately. For example, in this case, the operation unit may be configured to use at least one of an operation means such as a mouse, a joystick, and a keyboard.

For example, the monitor 4 may be a monitor mounted on the housing 2 or a monitor connected to the housing 2. For example, in this case, a configuration using a monitor of a personal computer may be used. Moreover, you may use a plurality of monitors together.

For example, the chin rest 5 keeps the distance between the optometry E and the subjective optometry device 1 constant. In this embodiment, a configuration in which the chin rest 5 is used to keep the distance between the optometry E and the subjective optometry device 1 constant has been described as an example, but the present invention is not limited to this. For example, in this embodiment, a forehead pad, a face pad, or the like may be used in order to keep the distance between the eye to be inspected E and the subjective optometry device 1 constant. For example, the chin rest 5 and the housing 2 are fixed to the base 6.

For example, the anterior eye image pickup optical system 100 is composed of an image pickup device (not shown) and a lens. For example, the anterior eye imaging optical system 100 is used to image the face of a subject.

<Measuring means>
For example, the measuring means 7 includes a measuring means 7L for the left eye and a measuring means 7R for the right eye. That is, the subjective optometry device 1 in this embodiment has a pair of left and right subjective measuring means and a pair of left and right objective measuring means. For example, the measuring means 7L for the left eye and the measuring means 7R for the right eye in this embodiment include the same member. Of course, the measuring means 7L for the left eye and the measuring means 7R for the right eye may have at least some components different from each other.

FIG. 2 is a diagram illustrating the configuration of the measuring means 7. For example, in this embodiment, the measuring means for the left eye 7L will be described as an example. Since the measuring means 7R for the right eye has the same configuration as the measuring means 7L for the left eye, the description thereof will be omitted. For example, the measuring means 7L for the left eye includes a subjective measurement optical system 25, an objective measurement optical system 10, a first index projection optical system 45, a second index projection optical system 46, an observation optical system 50, and the like.

<Aware optical system>
For example, the subjective measurement optical system 25 is used as a part of the configuration of the subjective measurement means for subjectively measuring the optical characteristics of the eye E to be inspected (details will be described later). For example, the optical characteristics of the eye to be inspected E include optical power, contrast sensitivity, binocular vision function (for example, oblique amount, stereoscopic vision function, etc.) and the like. In this embodiment, a subjective measuring means for measuring the refractive power of the eye to be inspected E will be described as an example. For example, the subjective measurement optical system 25 includes a projection optical system (target projection system) 30, a correction optical system 60, and a correction optical system 90.

For example, the projection optical system 30 projects the target luminous flux toward the eye E to be inspected. For example, the projection optical system 30 includes a display 31, a projection lens 33, a projection lens 34, a reflection mirror 36, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like. For example, the target light beam projected from the display 31 passes through the optical member in the order of the projection lens 33, the projection lens 34, the reflection mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14, and the eye to be inspected E. Projected on.

For example, the display 31 displays an inspection target such as a Randold ring optotype, an fixation target for fixing the eye E to be inspected, and the like. For example, the target luminous flux from the display 31 is projected toward the eye E to be inspected. For example, in this embodiment, an LCD (Liquid Crystal Display) is used as the display 31. As the display, an organic EL (Electro Luminescence) display or a plasma display can also be used.

For example, the correction optical system 60 is arranged in the optical path of the projection optical system 30. For example, the correction optical system 60 changes the optical characteristics of the target luminous flux. For example, the correction optical system 60 includes an astigmatism correction optical system 63 and a drive mechanism 39. For example, the astigmatism correction optical system 63 is arranged between the light projecting lens 33 and the light projecting lens 34. For example, the astigmatism correction optical system 63 is used to correct the columnar power and the astigmatism axis of the eye E to be inspected. For example, the astigmatism correction optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lens 61a and the cylindrical lens 61b are independently rotated about the optical axis L2 by driving the rotation mechanisms 62a and 62b, respectively. In this embodiment, the configuration using two positive cylindrical lenses 61a and 61b as the astigmatism correction optical system 63 has been described as an example, but the present invention is not limited to this. The astigmatism correction optical system 63 may have a configuration capable of correcting the cylindrical power, the astigmatism axis, and the like. In this case, for example, the corrective lens may be inserted into and out of the optical path of the projection optical system 30.

For example, the drive mechanism 39 includes a motor and a slide mechanism. For example, the drive mechanism 39 integrally moves the display 31 in the direction of the optical axis L2. For example, at the time of subjective measurement, by moving the display 31, the presentation position (presentation distance) of the optotype with respect to the eye E to be inspected is optically changed, and the spherical refractive power of the eye E to be inspected is corrected. That is, the movement of the display 31 constitutes a spherical power correction optical system. Further, for example, at the time of objective measurement, the movement of the display 31 causes cloud fog to be applied to the eye E to be inspected. The spherical power correction optical system is not limited to this. For example, the spherical power correction optical system may have a large number of optical elements and may be configured to perform correction by arranging the optical elements in the optical path. Further, for example, the spherical power correction optical system may be configured to move the lens arranged in the optical path in the optical axis direction.

In this embodiment, the correction optical system for correcting the spherical power, the cylindrical power, and the astigmatic axis is described as an example, but the present invention is not limited to this. For example, a correction optical system that corrects the prism value may be provided. By providing the correction optical system for the prism value, even if the subject has an oblique eye, the target luminous flux can be corrected so as to be projected onto the eye E to be examined.

In this embodiment, the astigmatism correction optical system 63 for correcting the columnar power and the columnar axis (astigmatism axis) and the correction optical system (for example, the drive mechanism 39) for correcting the spherical power are separately provided. The configuration to be provided has been described as an example, but the present invention is not limited to this. For example, the correction optical system may be configured to include a correction optical system that corrects the spherical power, the cylindricity, and the astigmatic axis. That is, the correction optical system in this embodiment may be an optical system that modulates the wavefront. Further, for example, the correction optical system may be an optical system that corrects spherical power, cylindrical power, astigmatic axis, and the like. In this case, for example, the correction optical system may include a lens disk in which a large number of optical elements (spherical lens, cylindrical lens, distributed prism, etc.) are arranged on the same circumference. The rotation of the lens disk is controlled by a drive unit (actuator, stepping motor, etc.), and the optical element (for example, cylindrical lens, cross-cylinder lens, rotary prism, etc.) desired by the examiner is rotated at the rotation angle desired by the examiner. It is arranged on the optical axis L2. For example, switching of the optical element arranged on the optical axis L2 may be performed by operating the monitor 4 or the like.

The lens disc comprises one lens disc or a plurality of lens discs. When a plurality of lens discs are arranged, a drive unit corresponding to each lens disc is provided. For example, as a lens disc group, each lens disc includes an aperture (or a 0D lens) and a plurality of optical elements. Typical types of lens discs are a spherical lens disc having a plurality of spherical lenses having different powers, a cylindrical lens disc having a plurality of cylindrical lenses having different powers, and an auxiliary lens disc having a plurality of types of auxiliary lenses. At least one of a red filter / green filter, a prism, a cross cylinder lens, a polarizing plate, a Maddox lens, and an auto cross cylinder lens is arranged on the auxiliary lens disk. Further, the cylindrical lens may be rotatably arranged around the optical axis L2 by the drive unit, and the rotary prism and the cross cylinder lens may be rotatably arranged around each optical axis by the drive unit.

For example, the correction optical system 90 is arranged between the objective lens 14 and the deflection mirror 81 described later. For example, the correction optical system 90 is used to correct optical aberrations (for example, astigmatism) that occur in subjective measurement. For example, the correction optical system 90 is composed of two positive cylindrical lenses 91a and 91b having the same focal length. For example, the correction optical system 90 corrects astigmatism by adjusting the cylindrical power and the astigmatic axis. The cylindrical lens 91a and the cylindrical lens 91b are independently rotated about the optical axis L3 by driving the rotation mechanisms 92a and 92b, respectively. In this embodiment, a configuration using two positive cylindrical lenses 91a and 91b as the correction optical system 90 has been described as an example, but the present invention is not limited to this. The correction optical system 90 may be configured as long as it can correct astigmatism. In this case, for example, the correction lens may be moved in and out of the optical axis L3.

In this embodiment, a configuration in which the correction optical system 90 is arranged separately from the correction optical system 60 has been described as an example, but the present invention is not limited to this. For example, the correction optical system 60 may be configured to also serve as the correction optical system 90. In this case, the cylindrical power and the cylindrical axis (astigmatic axis) of the eye E to be inspected are corrected according to the amount of astigmatism. That is, the correction optical system 60 is driven so as to correct the cylindrical power and the astigmatic axis in consideration of the amount of astigmatism. For example, by using the correction optical system 60 and the correction optical system 90 in combination, it is possible to correct optical aberrations with a simple configuration because complicated control is not required. Further, for example, by using the correction optical system 60 and the correction optical system 90 in combination, it is not necessary to separately provide a correction optical system for optical aberration, so that the optical aberration can be corrected with a simple configuration.

<Objective optical system>
For example, the objective measurement optical system 10 is used as a part of the configuration of the objective measurement means for objectively measuring the optical characteristics of the eye to be inspected (details will be described later). For example, the optical characteristics of the eye to be inspected E include an optical power, an axial length, a corneal shape, and the like. In this embodiment, an objective measuring means for measuring the refractive power of the eye to be inspected E will be described as an example. For example, the objective measurement optical system 10 is composed of a projection optical system 10a, a light receiving optical system 10b, and a correction optical system 90.

For example, the projection optical system (projection optical system) 10a projects a spot-shaped measurement index onto the fundus of the eye to be inspected E through the center of the pupil of the eye to be inspected E. For example, the light receiving optical system 10b takes out the fundus reflected light reflected from the fundus in a ring shape through the peripheral portion of the pupil, and causes the image pickup element 22 to image the ring-shaped fundus reflection image.

For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hole mirror 13, a prism 15, a drive unit (motor) 23, a dichroic mirror 35, and a dichroic arranged on the optical axis L1 of the objective measurement optical system 10. The mirror 29 and the objective lens 14 are included. For example, the prism 15 is a luminous flux deflection member. For example, the drive unit 23 rotationally drives the prism 15 around the optical axis L1. For example, the light source 11 has a conjugate relationship with the fundus of the eye E to be inspected. Further, the hole portion of the hole mirror 13 has a conjugate relationship with the pupil of the eye E to be inspected. For example, the prism 15 is arranged at a position deviating from the position conjugate with the pupil of the eye E to be inspected, and eccentricizes the passing light flux with respect to the optical axis L1. Instead of the prism 15, a parallel flat plate may be diagonally arranged on the optical axis L1 as a luminous flux deflection member.

For example, the dichroic mirror 35 shares the optical path of the subjective measurement optical system 25 and the optical path of the objective measurement optical system 10. That is, for example, in the dichroic mirror 35, the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 are coaxial. For example, the dichroic mirror 29, which is an optical path branching member, reflects the luminous flux by the subjective measurement optical system 25 and the measurement light by the projection optical system 10a and guides them to the eye E to be inspected.

For example, the light receiving optical system 10b shares the objective lens 14, the dichroic mirror 29, the dichroic mirror 35, the prism 15, and the hole mirror 13 of the projection optical system 10a, and the relay lens 16 is arranged in the optical path in the reflection direction of the hole mirror 13. , A light receiving aperture 18, a collimator lens 19, a ring lens 20, and an image pickup element 22 such as a CCD arranged in an optical path in the reflection direction of the mirror 17. For example, the light receiving diaphragm 18 and the image sensor 22 have a conjugate relationship with the fundus of the eye E to be inspected. For example, the ring lens 20 is composed of a ring-shaped lens portion and a light-shielding portion in which a region other than the lens portion is coated with a light-shielding coating, and is optically conjugated to the pupil of the eye E to be inspected. It is a relationship. For example, the output from the image sensor 22 is input to the control unit 70.

For example, the dichroic mirror 29 reflects the reflected light of the measurement light from the projection optical system 10a guided to the fundus of the eye E to be inspected toward the light receiving optical system 10b. Further, for example, the dichroic mirror 29 transmits the front eye portion observation light and the alignment light and guides them to the observation optical system 50. For example, the dichroic mirror 35 reflects the reflected light of the measurement light from the projection optical system 10a guided to the fundus of the eye E to be inspected toward the light receiving optical system 10b.

The objective measurement optical system 10 is not limited to the above, and a ring-shaped measurement index is projected from the peripheral portion of the pupil onto the fundus to extract the fundus reflected light from the central portion of the pupil, and the ring-shaped fundus is applied to the image pickup element 22. Well-known ones such as a configuration for receiving a reflected image can be used.

The objective measurement optical system 10 is not limited to the above, and includes a projection optical system that projects the measurement light toward the fundus of the eye E to be inspected and a reflected light acquired by the reflection of the measurement light on the fundus. It may be any measurement optical system having a light receiving optical system that receives light by a light receiving element. For example, the optical power measuring optical system may be configured to include a Shack-Hartmann sensor. Of course, a device provided with another measurement method may be used (for example, a phase difference method device that projects a slit).

For example, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18, the collimator lens 19, the ring lens 20, and the image pickup element 22 of the light receiving optical system 10b can be integrally moved in the optical axis direction. In this embodiment, for example, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18 of the light receiving optical system 10b, the collimator lens 19, the ring lens 20, and the image pickup element 22 are optical axes by a drive mechanism 39 for driving the display 31. It is integrally moved in the direction of L1. That is, the display 31, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18 of the light receiving optical system 10b, the collimator lens 19, the ring lens 20, and the image pickup element 22 are synchronized as the drive unit 95 and move integrally. Of course, each may be separately driven.

For example, the drive unit 95 moves a part of the objective measurement optical system 10 in the optical axis direction so that the outer ring light flux is incident on the image pickup device 22 in each meridian direction. That is, by moving a part of the objective measurement optical system 10 in the optical axis L1 direction according to the spherical refraction error (spherical refractive power) of the eye E to be inspected, the spherical refraction error is corrected and the fundus of the eye E to be inspected. The light source 11, the light receiving aperture 18, and the image pickup element 22 are optically coupled to each other. For example, the moving position of the drive mechanism 39 is detected by a potentiometer (not shown). The hole mirror 13 and the ring lens 20 are arranged so as to be conjugated with the pupil of the eye E to be inspected at a constant magnification regardless of the amount of movement of the drive unit 95.

In the above configuration, the measured luminous flux emitted from the light source 11 passes through the relay lens 12, the hole mirror 13, the prism 15, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14, and is spot-shaped on the fundus of the eye E to be inspected. Form a point light source image. At this time, the prism 15 rotating around the optical axis causes the pupil projection image (projected luminous flux on the pupil) of the hole portion in the hall mirror 13 to be eccentrically rotated at high speed. The point light source image projected on the fundus is reflected and scattered, emitted from the eye E to be inspected, condensed by the objective lens 14, and has a dichroic mirror 29, a dichroic mirror 35, a high-speed rotating prism 15, a hole mirror 13, and a relay lens. 16. The light is focused again at the position of the light receiving aperture 18 via the mirror 17, and a ring-shaped image is formed on the image pickup element 22 by the collimator lens 19 and the ring lens 20.

For example, the prism 15 is arranged in a common optical path of the projection optical system 10a and the light receiving optical system 10b. For example, since the reflected luminous flux from the fundus of the eye passes through the same prism 15 as the projected optical system 10a, in the subsequent optical systems, reverse scanning is performed as if there was no eccentricity of the projected luminous flux / reflected luminous flux (light-received luminous flux) on the pupil. Will be done.

For example, the correction optical system 90 is also used as the subjective measurement optical system 25. Of course, a correction optical system used in the objective measurement optical system 10 may be separately provided.

<1st index projection optical system and 2nd index projection optical system>
For example, in this embodiment, the first index projection optical system 45 and the second index projection optical system 46 are arranged between the correction optical system 90 and the deflection mirror 81. Of course, the arrangement positions of the first index projection optical system 45 and the second index projection optical system 46 are not limited to this. For example, the first index projection optical system 45 and the second index projection optical system 46 may be provided on the cover of the housing 2. For example, in this case, the first index projection optical system 45 and the second index projection optical system 46 may be arranged around the presentation window 3.

For example, in the first index projection optical system 45, a plurality of infrared light sources are arranged concentrically around the optical axis L3 at intervals of 45 degrees, and are arranged symmetrically with a vertical plane passing through the optical axis L3. ing. For example, the first index projection optical system 45 emits near-infrared light for projecting an alignment index on the cornea of the eye E to be inspected. For example, the second index projection optical system 46 includes six infrared light sources arranged at different positions from the first index projection optical system 45. In this case, the first index projection optical system 45 projects an index of infinity onto the cortex of the eye E to be inspected from the left-right direction, and the second index projection optical system 46 projects an index of finite distance on the cortex of the eye E to be inspected in the vertical direction. Alternatively, it is configured to project from an oblique direction. For convenience, FIG. 2 illustrates only a part of the first index projection optical system 45 and the second index projection optical system 46. The second index projection optical system 46 is also used as anterior eye portion illumination for illuminating the anterior eye portion of the eye E to be inspected. The second index projection optical system 46 can also be used as an index for measuring the shape of the cornea. The first index projection optical system 45 and the second index projection optical system 46 are not limited to the point light source. For example, it may be a ring-shaped light source or a line-shaped light source.

<Observation optical system>
For example, the observation optical system (imaging optical system) 50 shares the objective lens 14 and the dichroic mirror 29 in the subjective measurement optical system 25 and the objective measurement optical system 10, and includes an image pickup lens 51 and an image pickup element 52. For example, the image pickup device 52 has an image pickup surface arranged at a position substantially conjugate with the anterior eye portion of the eye E to be inspected. For example, the output from the image sensor 52 is input to the control unit 70. As a result, the image of the anterior eye portion of the eye E to be inspected is captured by the image pickup device 52 and displayed on the monitor 4. The observation optical system 50 also serves as an optical system for detecting an alignment index image formed on the cortex of the eye E to be inspected by the first index projection optical system 45 and the second index projection optical system 46, and is controlled by the control unit 70. The position of the alignment index image is detected.

<Internal configuration of subjective optometry device>
Hereinafter, the internal configuration of the subjective optometry device 1 will be described. FIG. 3 is a schematic configuration diagram of the inside of the subjective optometry device 1 according to the present embodiment as viewed from the front direction (direction A in FIG. 1). FIG. 4 is a schematic configuration diagram of the inside of the subjective optometry device 1 according to the present embodiment as viewed from the side direction (direction B in FIG. 1). FIG. 5 is a schematic configuration diagram of the inside of the subjective optometry device 1 according to the present embodiment as viewed from the upper surface direction (direction C in FIG. 1). Note that FIGS. 4 and 5 show only the optical axis of the left eye measuring means 7L for convenience of explanation.

For example, the subjective optometry device 1 includes a subjective measuring means and an objective measuring means. For example, in the subjective measuring means and the objective measuring means, the target luminous flux from the measuring means 7 passes through an optical path corresponding to the optical axis L of the optical member (for example, the concave mirror 85 described later) and is the eye to be inspected E. It may be guided to. Further, for example, in the subjective measuring means and the objective measuring means, the target luminous flux from the measuring means 7 passes through an optical path deviating from the optical axis L of the optical member (for example, the concave mirror 85 described later) and is covered. It may be guided to the optometry E. For example, in this embodiment, the optical axis L is an axis toward the center of the sphere of the concave mirror 85. In the following, a configuration in which the luminous flux from the measuring means 7 passes through a path deviating from the optical axis L of the concave mirror 85 will be described as an example. That is, the target luminous flux from the measuring means 7 is irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85, and the reflected luminous flux is guided to the eye E to be inspected.

For example, the subjective measuring means includes a measuring means 7, a deflection mirror 81, a drive mechanism 82, a drive means 83, a reflection mirror 84, and a concave mirror 85. The subjective measuring means is not limited to this configuration. For example, the configuration may not have the reflection mirror 84. In this case, the luminous flux from the measuring means 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Further, for example, a configuration having a half mirror may be used. In this case, the target luminous flux from the measuring means 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via the half mirror, and the reflected luminous flux may be guided to the eye E to be inspected. .. Although the concave mirror 85 is arranged in this embodiment, a convex lens may be arranged instead of the concave mirror 85.

For example, the objective measuring means includes a measuring means 7, a deflection mirror 81, a reflection mirror 84, and a concave mirror 85. The objective measuring means is not limited to this configuration. For example, the configuration may not have the reflection mirror 84. In this case, the luminous flux from the measuring means 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Further, for example, a configuration having a half mirror may be used. In this case, the target luminous flux from the measuring means 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via the half mirror, and the reflected luminous flux may be guided to the eye E to be inspected. .. Although the concave mirror 85 is arranged in this embodiment, a convex lens may be arranged instead of the concave mirror 85.

For example, the subjective optometry device 1 has a left eye driving means 9L and a right eye driving means 9R, and can move the left eye measuring means 7L and the right eye measuring means 7R in the X direction, respectively. .. For example, by moving the measuring means 7L for the left eye and the measuring means 7R for the right eye, the distance between the deflection mirror 81 and the measuring means 7 is changed, and the presentation position of the luminous flux in the Z direction is changed. To. As a result, the target light flux corrected by the correction optical system 60 is guided to the eye E to be inspected, and the image of the target light flux corrected by the correction optical system 60 is measured so as to be formed on the fundus of the eye E to be inspected. The means 7 can be adjusted in the Z direction.

For example, the deflection mirror 81 has a deflection mirror 81R for the right eye and a deflection mirror 81L for the left eye, which are provided in pairs on the left and right respectively. For example, the deflection mirror 81 is arranged between the correction optical system 60 and the eye E to be inspected. That is, the correction optical system 60 in this embodiment has a pair of left and right eye correction optical systems and a right eye correction optical system, and the left eye deflection mirror 81L has a left eye correction. It is placed between the optical system and the left eye ER, and the deflection mirror 81R for the right eye is placed between the corrective optical system for the right eye and the right eye ER. For example, the deflection mirror 81 is preferably arranged at the conjugate position of the pupil.

For example, the deflection mirror 81L for the left eye reflects the light flux projected from the measuring means 7L for the left eye and guides the light beam to the left eye subject EL. Further, for example, the deflection mirror 81L for the left eye reflects the reflected light reflected by the left eye subject EL and guides the light to the measuring means 7L for the left eye. For example, the deflection mirror 81R for the right eye reflects the light flux projected from the measuring means 7R for the right eye and guides the light beam to the right eye subject ER. Further, for example, the deflection mirror 81R for the right eye reflects the reflected light reflected by the right eye subject ER and guides the light to the measuring means 7R for the right eye. In this embodiment, a configuration in which a deflection mirror 81 is used as a deflection member that reflects the light flux projected from the measuring means 7 and guides the light beam to the eye E to be inspected is described as an example, but the present invention is limited to this. Not done. The deflection member may be any deflection member that reflects the light flux projected from the measuring means 7 and guides the light beam to the eye E to be inspected. For example, examples of the deflection member include a prism and a lens.

For example, the drive mechanism 82 includes a motor (drive unit) and the like. For example, the drive mechanism 82 has a drive mechanism 82L for driving the deflection mirror 81L for the left eye and a drive mechanism 82R for driving the deflection mirror 81R for the right eye. For example, the deflection mirror 81 rotates and moves by driving the drive mechanism 82. For example, the drive mechanism 82 rotates the deflection mirror 81 with respect to the rotation axis in the horizontal direction (X direction) and the rotation axis in the vertical direction (Y direction). That is, the drive mechanism 82 rotates the deflection mirror 81 in the XY directions. The rotation of the deflection mirror 81 may be in either the horizontal direction or the vertical direction.

For example, the drive means 83 includes a motor (drive unit) and the like. For example, the driving means 83 has a driving means 83L for driving the deflection mirror 81L for the left eye and a driving means 83R for driving the deflection mirror 81R for the right eye. For example, the deflection mirror 81 moves in the X direction by driving the drive means 83. For example, by moving the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye, the distance between the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye is changed, and the eye to be inspected. The distance in the X direction between the light path for the left eye and the light path for the right eye can be changed according to the interpupillary distance of E.

For example, a plurality of deflection mirrors 81 may be provided in each of the left eye optical path and the right eye optical path. For example, a configuration in which two deflection mirrors are provided in each of the left eye optical path and the right eye optical path (for example, two deflection mirrors in the left eye optical path) can be mentioned. In this case, one deflection mirror may be rotated in the X direction and the other deflection mirror may be rotated in the Y direction. For example, it is possible to optically correct the image formation position by deflecting the apparent luminous flux for forming the image of the correction optical system 60 in front of the eye to be inspected by rotating the deflection mirror 81. can.

For example, the concave mirror 85 is shared by the measuring means 7R for the right eye and the measuring means 7L for the left eye. For example, the concave mirror 85 is shared by an optical path for the right eye including a corrective optical system for the right eye and an optical path for the left eye including an optical path for the left eye. That is, the concave mirror 85 is arranged at a position that passes through both the optical path for the right eye including the correction optical system for the right eye and the optical path for the left eye including the correction optical system for the left eye. Of course, the concave mirror 85 does not have to be configured to be shared by the optical path for the right eye and the optical path for the left eye. That is, a concave mirror may be provided in each of the optical path for the right eye including the corrective optical system for the right eye and the optical path for the left eye including the corrective optical system for the left eye. For example, the concave mirror 85 guides the target luminous flux that has passed through the correction optical system to the eye E to be inspected, and forms an image of the target luminous flux that has passed through the correction optical system in front of the eye E to be inspected. In this embodiment, the configuration using the concave mirror 85 has been described as an example, but the present invention is not limited to this, and various optical members can be used. For example, as the optical member, a lens, a plane mirror, or the like can be used.

For example, the concave mirror 85 is used as both a subjective measuring means and an objective measuring means. For example, the luminous flux projected from the subjective measurement optical system 25 is projected onto the eye E to be inspected via the concave mirror 85. For example, the measurement light projected from the objective measurement optical system 10 is projected onto the eye E to be inspected via the concave mirror 85. Further, for example, the reflected light of the measurement light projected from the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85. In this embodiment, an example is a configuration in which the reflected light of the measurement light by the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85. However, it is not limited to this. For example, the reflected light of the measurement light by the objective measurement optical system 10 may be configured not to pass through the concave mirror 85.

More specifically, for example, in the present embodiment, the optical axis between the concave mirror 85 and the eye E to be inspected in the subjective measuring means and the concave mirror 85 to the eye E in the objective measuring means. The optical axis is configured to be at least coaxial. For example, in this embodiment, the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 are combined and coaxial with each other by the dichroic mirror 35.

<Optical path of subjective measurement means>
Hereinafter, the optical path of the subjective measurement means will be described. For example, the subjective measurement means guides the target light beam to the eye E to be inspected by reflecting the target light beam that has passed through the correction optical system 60 in the direction of the eye to be inspected by the concave mirror 85, and passes through the correction optical system 60. An image of the optotype beam is formed in front of the eye E to be inspected so as to optically have a predetermined inspection distance. For example, at this time, the target light beam passing through the correction optical system 60 passes through an optical path deviating from the optical axis L of the concave mirror 85, enters the concave mirror 85, and is an optical path deviating from the optical axis L of the concave mirror 85. It is reflected so as to pass through, and is guided to the eye E to be inspected. For example, the optotype image seen by the subject appears to be farther than the actual distance from the eye E to be examined to the display 31. That is, by using the concave mirror 85, the display distance of the optotype to the eye E to be inspected is extended, and the optotype image is presented to the subject so that the image of the luminous flux can be seen at the position of the predetermined inspection distance. Can be done.

It will be explained in more detail. In the following description, the optical path for the left eye will be described as an example, but the optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the subjective measurement means for the left eye, the luminous flux projected from the display 31 of the measurement means 7L for the left eye is incident on the astigmatism correction optical system 63 via the projection lens 33. The target light beam that has passed through the astigmatism correction optical system 63 is incident on the correction optical system 90 via the reflection mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. The luminous flux that has passed through the correction optical system 90 is guided from the measuring means for the left eye 7L toward the deflection mirror 81L for the left eye. The luminous flux emitted from the measuring means 7L for the left eye and reflected by the deflection mirror 81 for the left eye is reflected toward the concave mirror 85 by the reflection mirror 84. For example, the luminous flux emitted from the display 31 reaches the left eye subject EL by passing through the optical member in this way.

As a result, an optotype image corrected by the correction optical system 60 is formed on the fundus of the left eye to be inspected EL based on the spectacle wearing position of the left eye to be inspected EL (for example, about 12 mm from the apex position of the cornea). Therefore, the astigmatism correction optical system 63 was arranged in front of the eyes, and the spherical power was adjusted in front of the eyes by the correction optical system of the spherical power (in this embodiment, the drive mechanism 39 was driven). Is equivalent, and the subject can collimate the image of the optotype in a natural state through the concave mirror 85. In this embodiment, the optical path for the right eye has the same configuration as the optical path for the left eye, and the positions of the left eye subject EL and the right eye subject ER for wearing spectacles (for example, about 12 mm from the position of the apex of the cornea) are set. As a reference, an optotype image corrected by a pair of left and right correction optical systems 60 is formed on the fundus of both eyes. In this way, the subject responds to the examiner while directly looking at the optotype in the state of natural vision, corrects by the correction optical system 60 until the inspection optotype looks appropriate, and is based on the correction value. The optical characteristics of the eye to be inspected are measured subjectively.

<Optical path of objective measuring means>
Next, the optical path of the objective measuring means will be described. In the following description, the optical path for the left eye will be described as an example, but the optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the objective measuring means for the left eye, the measurement light emitted from the light source 11 of the projection optical system 10a in the objective measurement optical system 10 passes through the relay lens 12 to the objective lens 14 and is corrected by the correction optical system 90. Incident to. The measurement light that has passed through the correction optical system 90 is projected from the measurement means for the left eye 7L toward the deflection mirror 81L for the left eye. The measurement light emitted from the left-eye measuring means 7L and reflected by the left-eye deflection mirror 81 is reflected by the reflection mirror 84 toward the concave mirror 85. The measurement light reflected by the concave mirror passes through the reflection mirror 84 and reaches the left eye subject EL, and forms a spot-shaped point light source image on the fundus of the left eye subject EL. At this time, the prism 15 rotating around the optical axis causes the pupil projection image (projected luminous flux on the pupil) of the hole portion of the hall mirror 13 to be eccentrically rotated at high speed.

The light of the point light source image formed on the fundus of the left eye to be inspected EL is reflected and scattered to emit the eye to be inspected E, and is collected by the objective lens 14 through the optical path through which the measurement light has passed, and is collected by the objective lens 14 to be a dichroic mirror. 29, through the dichroic mirror 35, the prism 15, the hole mirror 13, the relay lens 16, and the mirror 17. The reflected light passing through the mirror 17 is collected again on the aperture of the light receiving diaphragm 18, is converted into a substantially parallel light beam (in the case of an emmetropic eye) by the collimator lens 19, and is taken out as a ring-shaped light beam by the ring lens 20. It is received by the image pickup element 22 as a ring image. By analyzing the received ring image, the optical characteristics of the eye E to be inspected can be objectively measured.

<Control unit>
FIG. 6 is a diagram showing a control system of the subjective optometry device 1 according to the present embodiment. For example, various members such as a monitor 4, a non-volatile memory 75 (hereinafter referred to as a memory 75), a measurement light source 11 included in the measuring means 7, an image pickup element 22, a display 31, and an image pickup element 52 are electrically connected to the control unit 70. Has been done. Further, for example, the control unit 70 is electrically connected to a drive unit (not shown) provided with the drive means 9, the drive mechanism 39, the rotation mechanisms 62a and 62b, the drive means 83, and the rotation mechanisms 92a and 92b, respectively.

For example, the control unit 70 includes a CPU (processor), RAM, ROM, and the like. For example, the CPU controls each member in the subjective optometry device 1. For example, RAM temporarily stores various types of information. For example, the ROM stores various programs for controlling the operation of the subjective optometry device 1, optotype data for various examinations, initial values, and the like. The control unit 70 may be composed of a plurality of control units (that is, a plurality of processors).

For example, the memory 75 is a non-transient storage medium capable of retaining the storage contents even when the power supply is cut off. For example, as the memory 75, a hard disk drive, a flash ROM, a USB memory detachably attached to the subjective optometry device 1, and the like can be used. For example, the memory 75 stores a control program for controlling the subjective measuring means and the objective measuring means.

<Control operation>
The control of the subjective optometry device 1 having the above configuration will be described. For example, in this embodiment, a case where the optical characteristics of the eye to be inspected E during long-distance measurement are measured by using the subjective optometry device 1 will be given as an example. Of course, the optometry device 1 may be used to measure the optical characteristics of the eye E to be inspected in near use.

<Alignment of the eye to be inspected>
The examiner instructs the subject to place his / her jaw on the chin rest 5 and observe the fixation target displayed on the display 31 through the presentation window 3. An alignment index image (hereinafter referred to as an index image) is projected onto the eye E of the subject by turning on the light sources of the first index projection optical system 45 and the second index projection optical system 46. Further, the anterior segment of the eye E to be inspected is detected by the anterior segment imaging optical system 100. When the anterior eye portion of the eye to be inspected E is detected, the control unit 70 starts aligning the eye to be inspected E with the measuring means 7. That is, the control unit 70 starts automatic alignment.

FIG. 7 is a diagram showing an image of the anterior segment of the eye to be inspected E. For example, when the alignment state is detected, the light sources included in the first index projection optical system 45 and the second index projection optical system 46 are turned on. As a result, the index images Ma to Mh are projected on the eye E to be inspected in a ring shape. For example, the control unit 70 detects the XY center coordinates (cross mark shown in FIG. 7) in the index images Ma to Mh as the substantially corneal apex position K. For example, the index images Ma and Me are at infinity, and the index images Mh and Mf are at finite distance.

For example, the alignment state of the eye E to be inspected in the left-right direction (X direction) and the up-down direction (Y direction) is determined using a preset alignment reference position N (see FIG. 8). For example, in this embodiment, such an alignment reference position N is the corneal apex position of the eye E to be inspected, the optical axis L4L or L4R of the luminous flux reflected by the concave mirror 85 and directed toward the eye E to be inspected. Is set to the matching position. Further, for example, a predetermined region centered on the alignment reference position N is set as an alignment allowable range A1 (see FIG. 8) for determining the suitability of alignment.

FIG. 8 is a diagram illustrating alignment control. For example, the control unit 70 determines the displacement amount Δd between the detected approximately corneal apex position K of the eye to be inspected E and the alignment reference position N to determine the positional deviation of the target luminous flux with respect to the eye to be inspected E in the XY direction. To detect. For example, when the positional deviation of the luminous flux with respect to the eye E to be inspected is detected, the control unit 70 moves the measuring means 7 based on the detection result. For example, in this embodiment, the deflection mirror 81 and the measuring means 7 can be integrally moved in the X direction to align the eye E to be inspected in the X direction (left-right direction). Further, for example, in the present embodiment, by integrally moving the deflection mirror 81 and the measuring means 7 in the Z direction, the alignment of the eye E to be inspected E can be performed in the Y direction (vertical direction). The deflection mirror 81 and the measuring means 7 are not integrated, and may be configured to move separately. For example, the control unit 70 adjusts the alignment in the X direction and the Y direction so that the deviation amount Δd falls within the alignment allowable range A1.

Further, for example, the control unit 70 compares the image ratio (that is, a / b) between the image spacing a of the index images Ma and Me at infinity and the image spacing b of the index images Mh and Mf at finite distance. Detects the positional deviation of the target luminous flux with respect to the eye E to be inspected in the Z direction. For example, when the positional deviation of the luminous flux with respect to the eye E to be inspected is detected, the control unit 70 moves the measuring means 7 based on the detection result. For example, in this embodiment, the deflection mirror 81 and the measuring means 7 can be integrally moved in the Y direction to align the eye E to be inspected in the Z direction (front-back direction). In the Z direction as well, an alignment allowable range for determining the suitability of alignment may be set.

For example, when the alignment deviation amount of the eye E to be inspected E in the XYZ direction falls within the allowable range, the control unit 70 stops driving the deflection mirror 81 and the measuring means 7 and outputs an alignment completion signal. The control unit 70 always detects the alignment deviation amount even when the alignment is completed, and if the alignment deviation amount exceeds the allowable range, the automatic alignment may be restarted. That is, the control unit 70 performs tracking control for tracking the photographing unit of the anterior eye portion imaging optical system 100 with respect to the eye E to be inspected so that the amount of alignment deviation is within the permissible range.

<Objective measurement>
When the alignment of the eye E to be inspected is completed, the control unit 70 irradiates the measured luminous flux from the light source 11 included in the objective measurement optical system 10. The measured luminous flux reaches the fundus of the left eye subject EL via the deflection mirror 81L and the concave mirror 85, is reflected by the fundus, and then reaches the image pickup element 22 via the concave mirror 85 and the deflection mirror 81L. Similarly, the measured luminous flux reaches the fundus of the right eye to be inspected ER via the deflection mirror 81R and the concave mirror 85, is reflected by the fundus, and then reaches the image pickup element 22 via the concave mirror 85 and the deflection mirror 81R. .. The objective measurement may be performed simultaneously on the left and right eyes, or may be performed at different timings on the left and right eyes.

For example, in the objective measurement, a preliminary measurement of the objective refractive power is first performed, and the display 31 is moved in the optical axis L2 direction based on the result of the preliminary measurement, so that the cloud fog with respect to the eye E to be inspected. May be applied. That is, after the display 31 is once moved to a position where the eye to be inspected E is in focus, the display 31 may be moved to a position where the amount of cloud fog is appropriate to apply cloud fog to the eye E to be inspected. .. For details on the calculation of the amount of cloud fog, refer to, for example, Japanese Patent Application Laid-Open No. 2017-99640.

Further, for example, in the objective measurement, the objective measurement of the objective refractive power may be performed on the eye E subject to cloud fog. In this measurement, the measured image (that is, the above-mentioned ring image) is captured by the image pickup device 22 and stored in the memory 75. For example, the control unit 70 obtains an optical power in each meridian direction by image analysis of a ring image, and performs a predetermined process on the optical power, so that the eye to be inspected measured by objective measurement is performed. The optical property of E (that is, at least one of the spherical power measured by the objective measurement, the cylindrical power, and the astigmatic axis angle) is acquired. Further, the control unit 70 stores the acquired optical characteristics in the objective measurement in the memory 75.

<Aware measurement>
When the objective measurement is completed, the examiner operates the monitor 4 to switch the measurement mode and performs the subjective measurement for the eye E to be inspected. The control unit 70 throws the correction optical system 60 and the correction optical system 60 so that the refractive power of the eye E to be inspected is corrected to 0D based on the optical characteristics (objective value) of the eye E to be inspected acquired by the objective measurement. It controls at least one of the opto-optical system 30. In this case, the control unit 70 may correct at least one of the cylindrical power and the astigmatic axis angle by rotating the cylindrical lenses 61a and 61b. Further, in this case, the control unit 70 may correct the spherical power by moving the display 31. As a result, it is possible to obtain the correction power at which the refractive power of the eye to be inspected E becomes 0D. The control unit 70 controls at least one of the correction optical system 60 and the projection optical system 30 so that the refractive power of the eye to be inspected E is corrected to other than 0D (for example, -1D). May be good. Further, the control unit 70 displays a required visual acuity value visual acuity target (for example, a visual acuity value 1.0 target) on the display 31 as an inspection target.

The examiner selects a predetermined switch displayed on the monitor 4 in order to determine whether the correction power set based on the optical characteristics in the objective measurement is appropriate for the subject, and the examiner selects the predetermined switch and examines the subject. The visual acuity value optotype displayed on the display 31 is switched according to the answer of the person. For example, if the subject's answer is correct, the examiner switches to a visual acuity target that is one step higher, and if the subject's answer is incorrect, the examiner switches to a visual acuity target that is one step lower. That is, the control unit 70 switches the optotype to be displayed on the display 31 based on the signal from the monitor 4 that changes the visual acuity optotype.

If the above correction power is not appropriate for the subject, the examiner operates the monitor 4 to change the correction power of the correction optical system 60 and the projection optical system 30, and the changed correction power is changed. You may decide if it is appropriate for the subject. For example, the control unit 70 determines the correction degree when the examiner deems it appropriate as the optical characteristics of the eye E to be inspected measured by the subjective measurement (that is, the spherical power measured by the subjective measurement and the cylindrical power). , And at least one of the astigmatic axis angles). Further, the control unit 70 stores the acquired optical characteristics in the subjective measurement in the memory 75.

The subjective measurement may be performed simultaneously in the left and right eyes to be inspected, or may be carried out in different timings in the left and right eyes to be inspected. When the timings are different, the visual acuity value optotype may not be displayed on the display 31 on the non-measurement eye side, or the fog (for example, constant with respect to the objective refractive power) by the correction optical system 60 may be used. It may be configured to perform (addition of refractive power).

<Generation of optical aberration component>
Here, for example, when the subjective measurement of the eye to be inspected E is performed by using the subjective eye examination device 1, it is generated by the first optical aberration component generated by the subjective measurement means and the optical characteristics of the eye to be inspected E. A second optical aberration component and a third optical aberration component based on the second optical aberration component are generated. For example, the optical aberration component may be at least one of the direction of the optical aberration, the amount (magnitude) of the optical aberration, and the like. Further, for example, the optical aberration may be at least one of spherical aberration, astigmatism, coma, curvature of field, distortion, chromatic aberration, and the like.

For example, the first optical aberration component generated by the subjective measuring means includes the alignment state of the eye E to be inspected, the correction power set by the correction optical system 60 (that is, the spherical power, the columnar power, the astigmatic axis angle, etc.). It varies depending on at least one of the convergence angles of the optometric light beam, and the like. For example, when at least one of these changes, the reflection position or the reflection area (that is, the luminous flux diameter of the optotype light beam) on the concave mirror 85 of the optotype beam emitted toward the concave mirror 85 provided by the subjective measuring means. ) Changes. As an example, the reflection area of the target luminous flux irradiated on the concave mirror 85 changes by changing the correction power set by the correction optical system 60. That is, the focusing state of the target luminous flux with respect to the concave mirror 85 changes depending on the correction power set by the correction optical system 60. For example, when the correction power is 0D, the target luminous flux is incident on the concave mirror 85 from infinity as a parallel luminous flux. For example, the stronger the correction power is on the positive side, the stronger the luminous flux is incident on the concave mirror 85 as a diffuse luminous flux. Therefore, the reflected area of the visual target luminous flux becomes large, and the first optical aberration component becomes large. Further, for example, the stronger the correction power is on the minus side, the stronger the focused light flux is incident on the concave mirror 85. Therefore, the reflection area becomes small and the first optical aberration component becomes small.

For example, the correction power set by the correction optical system 60 changes depending on at least one of the spherical power, the cylindrical power, and the astigmatic axis angle of the eye E to be inspected. That is, in this embodiment, the optical aberration component generated by the correction power set in the correction optical system 60 changes according to the second optical aberration component.

In this embodiment, the optical aberration component generated by the change in the correction degree set in the correction optical system 60 and the optical aberration component changed by moving the optical member of the subjective measuring means are generated. The optical aberration component to be used may be used as the first optical aberration component. For example, in this case, the first optical aberration component is composed of an optical aberration component generated by a change in the correction power set in the correction optical system 60 and an optical aberration component generated by a change in the alignment state of the eye E to be inspected. It may be an optical aberration component that is generated. Further, for example, in this case, the first optical aberration component includes an optical aberration component generated by a change in the correction power set in the correction optical system 60 and an optical aberration component generated by a change in the convergence angle of the optotype light beam. It may be an optical aberration component generated by.

For example, the second optical aberration component (in other words, the eyeball aberration component of the eye to be inspected E) generated by the optical characteristics (optical power) of the eye to be inspected E is the spherical power, the cylindrical power, and the astigmatic axis angle of the eye to be inspected E. Determined by at least one of. Hereinafter, the second optical aberration component will be described by exemplifying a case where the eye to be inspected E is a normal eye (when the optical refractive power of the eye to be inspected E is 0D) and a case where the eye to be inspected E is an astigmatic eye. In the following, a case where the target luminous flux is irradiated toward the eye E to be inspected in a perfect circular shape will be illustrated.

For example, if the eye to be inspected E is a normal eye, the luminous flux irradiated in a perfect circular shape reaches the fundus of the eye to be inspected E in the perfect circular shape. However, for example, if the eye to be inspected E is an astigmatic eye, the luminous flux irradiated in the perfect circular shape reaches the fundus of the eye to be inspected E in a state of being deformed from the perfect circular shape to the elliptical shape. The degree to which the elliptical shape is deformed (for example, the change in the length of the minor axis of the elliptical shape) changes according to the cylindrical power of the eye E to be inspected. Further, for example, if the eye E to be inspected is an astigmatic eye, the luminous flux deformed into an elliptical shape reaches the fundus of the eye E to be inspected in a state of being rotated about the center of the luminous flux. How much the elliptical shape rotates depends on the astigmatic axis angle of the eye E to be inspected.

For example, although the astigmatic eye is illustrated above, the luminous flux is deformed even in the case of a myopic eye or a hyperopic eye. In this case, the target luminous flux irradiated in a perfect circular shape is enlarged or reduced as compared with that of the normal eye, and reaches the fundus of the eye E to be inspected. How much the luminous flux is enlarged or reduced depends on the spherical power of the eye E to be inspected. Since the second optical aberration component is such an optical aberration component peculiar to the eye E to be inspected, it does not change due to a change in the correction power or the like set in the correction optical system 60.

For example, in the subjective optometry device 1 of the present embodiment, the synthetic optical aberration component in which the first optical aberration component and the second optical aberration component are combined is generated as the third optical aberration component. In this case, for example, the third optical aberration component is the direction of the synthetic optical aberration in which the direction of the optical aberration as the first optical aberration component and the direction of the optical aberration as the second optical aberration component are combined. There may be. Further, for example, in this case, the third optical aberration component is the amount of synthetic optical aberration obtained by combining the amount of optical aberration as the first optical aberration component and the amount of optical aberration as the second optical aberration component. There may be. Of course, for example, the third optical aberration component is the direction and amount of optical aberration as the first optical aberration component and the direction and amount of optical aberration as the second optical aberration component. And quantity.

<Setting the amount of correction to correct the optical aberration component>
For example, the control unit 70 corrects a third optical aberration component based on the first optical aberration component generated by the subjective measuring means and the second optical aberration component generated by the optical characteristics of the eye E to be inspected. Set the correction amount of. For example, in this embodiment, the control unit 70 corrects a synthetic optical aberration component in which the first optical aberration component and the second optical aberration component are combined as a correction amount for correcting the third optical aberration component. You may set the correction amount for this.

For example, in this embodiment, the first optical aberration component generated for each change in the correction power set in the correction optical system 60 may be stored in the memory 75 in advance. Of course, the first optical aberration component generated for each change in the position (that is, the alignment state) of the measuring means 7 with respect to the eye E to be inspected may be stored in the memory 75 in advance. Further, the first optical aberration component generated for each change of the angle of the deflection mirror 81 (that is, the convergence angle of the target luminous flux) may be stored in the memory 75 in advance. Further, for example, in this embodiment, the second optical aberration component generated for each optical characteristic of the eye E to be inspected may be stored in the memory 75 in advance.

For example, the control unit 70 may use the state of the optical member in the subjective measurement means (that is, at least one of the correction state of the correction optical system 60, the position of the measurement means 7, the angle of the deflection mirror 81, etc.) and the eye E to be inspected. Each optical aberration component stored in the memory 75 may be acquired based on the optical characteristics. Further, for example, the control unit 70 may acquire a synthetic optical aberration component obtained by synthesizing these optical aberration components based on each optical aberration component. In this case, the synthetic optical aberration component based on the first optical aberration component and the second optical aberration component may be stored in the memory 75 in advance. Of course, the synthetic optical aberration component may be acquired by using a table or an arithmetic expression created by conducting an experiment or a simulation in advance. Further, for example, the control unit 70 may set a correction amount for correcting the synthetic optical aberration component based on the acquired synthetic optical aberration component.

Hereinafter, the setting of the correction amount for correcting the composite optical aberration component will be described in detail. For example, in this embodiment, a case where astigmatism occurs as an optical aberration will be taken as an example. That is, as the first optical aberration component, the first astigmatism component generated by the subjective measuring means is generated, and as the second optical aberration component, the astigmatism component possessed by the eye E to be inspected (that is, the columnar power of the eye E to be inspected and the columnar power of the eye E to be inspected). The second astigmatism component generated by the astigmatism axis angle) is generated. For example, in the subjective optometry device 1, a synthetic astigmatism component in which these first astigmatism component and the second astigmatism component are combined is generated. For example, the control unit 70 sets a correction amount in consideration of the direction and amount of the combined astigmatism.

FIG. 9 is a diagram illustrating a correction amount for correcting a synthetic astigmatism component. Note that FIG. 9 is a conceptual diagram in which polar coordinates representing the length r of the vector as the amount of astigmatism and the angle θ of the vector as the direction of astigmatism are converted into virtual Cartesian coordinates. For example, when converting polar coordinates to Cartesian coordinates, the following formulas 1 and 2 are used. X in Equation 1 is the position of the x-coordinate in Cartesian coordinates. Y in Equation 2 is the position of the y coordinate in Cartesian coordinates.

For example, when the polar coordinates of the first astigmatism component 111 are (r, θ) = (1,30 °), the Cartesian coordinates of the first astigmatism component 111 are determined by the above formula (x, y) =. It can be expressed as (0.86, 0.5). Further, for example, when the polar coordinates of the second astigmatism component 222 are (r, θ) = (2,60 °), the Cartesian coordinates of the second astigmatism component 222 are determined by the above formula (x, y). ) = (1,1.73). For example, the combined astigmatism component 333 is an astigmatism component in which the first astigmatism component 111 and the second astigmatism component 222 are combined, and can be represented by the sum of these vectors. That is, the Cartesian coordinates of the combined astigmatism component 333 are (x, y) = (1.86, 2.23).

For example, the control unit 70 adds a fourth astigmatism component 444 whose vector direction is opposite to that of the combined astigmatism component 333 and whose vector length is the same as that of the third astigmatism component 333. The correction amount is set as the correction amount for correcting the combined astigmatism component. That is, the control unit 70 sets a correction amount that cancels the synthetic astigmatism component 333 as a correction amount for correcting the synthetic optical aberration component. For example, in FIG. 9, the Cartesian coordinates of the fourth astigmatism component 444 are (x, y) = (-1.86, -2.23).

For example, the control unit 70 can obtain the direction and amount of the fourth astigmatism component 444 by converting the Cartesian coordinates of the fourth astigmatism component 444 into polar coordinates. That is, the control unit 70 sets a correction amount for correcting the combined astigmatism component by converting it into the polar coordinates of the fourth astigmatism component 444. For example, the control unit 70 substitutes the position of the x-coordinate and the position of the y-coordinate in the Cartesian coordinates into the following formula 3, so that the length r of the vector of the fourth astigmatism component 444 (that is, the fourth astigmatism component 444). Amount of aberration) is calculated.

Further, for example, the control unit 70 substitutes the length r of the vector of the fourth astigmatism component 444 obtained by the formula 3 into either the formula 1 or the formula 2, thereby substituting the fourth astigmatism component 444. The angle θ of the vector of (that is, the direction of the fourth astigmatism) is obtained.

For example, this allows the polar coordinates of the fourth astigmatism component 444 to be expressed as (r, θ) = (2.91, 23.1 °). For example, the control unit 70 sets 2.91 (2.91D) as a correction amount for correcting the amount of synthetic astigmatism (in other words, the cylindrical power), and the direction of the synthetic astigmatism (in other words, in other words, 230.1 ° is set as the correction amount for correcting the astigmatism axis angle). The astigmatism axis angle is represented by 0 ° to 180 °. For example, since the astigmatism axis angle 90 ° is synonymous with the astigmatism axis angle 270 °, 50.1 ° may be set as the correction amount in this embodiment. .. Further, FIG. 9 is a conceptual diagram, and the numerical value represented by polar coordinates is not always the correction amount actually set.

For example, in the above, the correction amount for correcting the synthetic astigmatism component (third astigmatism component) was calculated using the conceptual diagram, but the memory 75 is for correcting the synthetic astigmatism component. A correction table for acquiring the correction amount may be stored. Further, the memory 75 may store an arithmetic expression for calculating a correction amount for correcting a synthetic astigmatism component. For example, such a correction table and an arithmetic expression may be created by conducting an experiment or a simulation in advance. For example, the control unit 70 sets a correction amount for correcting the synthetic astigmatism component based on at least one of the correction table and the calculation formula. For example, in this embodiment, a correction amount for correcting the amount of synthetic astigmatism and a correction amount for correcting the direction of the synthetic astigmatism are set, respectively.

For example, in this embodiment, the synthetic astigmatism component 444 changes for each eye to be inspected when the astigmatic axis angle of the eye to be inspected E is different even if the cylindrical power of the eye to be inspected E is the same. This will be described by taking as an example a change in the correction amount for correcting the amount of synthetic astigmatism. FIG. 13 is a diagram showing a change in the correction amount set for correcting the synthetic astigmatism component 444 when the astigmatism axis angle of the eye E to be inspected is different. For example, in FIG. 13, the horizontal axis indicates the astigmatic axis angle of the eye E to be inspected. Further, for example, in FIG. 13, the vertical axis indicates a correction amount for correcting the amount of synthetic astigmatism. For example, when the eye to be inspected E is a normal eye (0D), the correction amount becomes a predetermined value as shown by the dotted line, but when the eye to be inspected E is an astigmatic eye (for example, -5D, etc.), the solid line is used. As shown by, the correction amount changes for each astigmatic axis angle.

<Correction of optical aberration component>
Subsequently, the control unit 70 corrects the third astigmatism component based on the set correction amount. For example, in this embodiment, the control unit 70 corrects the third astigmatism component by correcting the synthetic astigmatism component based on the correction amount for correcting the synthetic astigmatism component. In this case, the control unit 70 may correct the third astigmatism component by changing the correction power of the correction optical system 60.

For example, in this embodiment, both the amount of synthetic astigmatism and the direction of synthetic astigmatism are corrected by using the two cylindrical lenses 61a and 61b included in the astigmatism correction optical system 63. For example, the control unit 70 can correct the amount of combined astigmatism by changing the relative angle α between the cylindrical lenses 61a and 61b. Further, for example, the control unit 70 can correct the direction of the combined astigmatism by changing the rotation angles β of the cylindrical lenses 61a and 61b.

FIG. 10 is a diagram illustrating a relative angle α and a rotation angle β of a cylindrical lens. FIG. 10A shows the relative angle of the cylindrical lens. FIG. 10B shows the rotation angle of the cylindrical lens. For example, the relative angle α of the cylindrical lens is expressed as an angle formed by the axis Sa of the cylindrical lens 61a and the axis Sb of the cylindrical lens 61b. For example, the control unit 70 drives at least one of the rotation mechanisms 62a and 62b based on the correction amount for correcting the amount of synthetic astigmatism set as described above, and drives the cylindrical lens 61a and the cylinder. The relative angle α of the lens 61b is changed. For example, the amount of astigmatism (that is, the cylindrical power) generated when each relative angle α is set is calculated from the refractive power of the cylindrical lenses 61a and 61b and is associated with each relative angle in advance. .. For example, the control unit 70 can generate a set amount of synthetic astigmatism by changing the relative angle α of the cylindrical lens. As a result, the target luminous flux having a predetermined amount of optical aberration is incident on the eye E to be inspected.

Further, for example, the rotation angle β of the cylindrical lens is expressed as an angle in which the two cylindrical lenses 61a and 61b are rotated while maintaining the relative angle α. For example, in FIG. 10B, the position of the axis shown by the dotted line is the position of the axis before rotating the cylindrical lens, and the position of the axis shown by the solid line is the position of the axis after rotating the cylindrical lens. For example, the control unit 70 drives the rotation mechanisms 62a and 62b based on the correction amount for correcting the direction of the combined astigmatism set as described above, and the rotation angle of the cylindrical lens 61a and the cylindrical lens 61b. Change β. In this embodiment, the angle at which the axis Sa of the cylindrical lens 61a is rotated is defined as the rotation angle β, but the angle at which the axis Sb of the cylindrical lens 61b is rotated may be considered as the rotation angle β. For example, the control unit 70 can generate the direction of the set synthetic astigmatism (that is, the astigmatism axis angle) by changing the rotation angle β of the cylindrical lens. As a result, the target luminous flux having a predetermined optical aberration direction is incident toward the eye E to be inspected.

For example, by correcting the synthetic astigmatism component generated when the subjective measurement of the eye to be inspected E is performed by using the subjective optometry device 1, the astigmatism can be canceled and reduced. It is possible to accurately perform subjective measurement for the eye E to be inspected.

In the above, an example is a configuration in which both the amount of synthetic astigmatism and the direction of synthetic astigmatism are corrected by using two cylindrical lenses 61a and 61b provided in the astigmatism correction optical system 63. Although explained above, it is not limited to this. For example, the two cylindrical lenses 91a and 91b included in the correction optical system 90 may be used to correct both the amount of synthetic astigmatism and the direction of synthetic astigmatism. Further, for example, the two cylindrical lenses 61a and 61b included in the astigmatism correction optical system 63 are used to correct either the amount of synthetic astigmatism or the direction of synthetic astigmatism, and the correction optical system 90 is provided. The two cylindrical lenses 91a and 91b may be used to correct either the amount of synthetic astigmatism or the direction of synthetic astigmatism. Even with these configurations, by changing the relative angle α and the rotation angle β of the two cylindrical lenses, it is possible to correct the synthetic astigmatism component generated when the subjective measurement is performed.

<Correction of target luminous flux generated by correction of optical aberration component>
For example, by correcting the third astigmatism component, distortion occurs in the target luminous flux projected on the fundus of the eye E to be inspected. Therefore, for example, the control unit 70 may correct the distortion of the luminous flux generated by correcting the third astigmatism component. In other words, the distortion of the target luminous flux projected on the fundus of the eye E to be inspected may be corrected. For example, in this embodiment, the distortion of the target luminous flux generated by correcting the synthetic astigmatism component is corrected.

For example, in this embodiment, the distortion of the luminous flux of the optotype can be corrected by deforming the optotype displayed on the display 31. More specifically, the optotype is deformed by performing at least one of a process of changing the vertical size of the optotype displayed on the display 31, changing the size in the horizontal direction, and moving the optotype. Therefore, it is possible to correct the distortion of the target luminous flux. This will be described below.

FIG. 11 is a diagram illustrating distortion of the luminous flux. In this embodiment, for convenience of explanation, a grid BF having a basic shape having the same vertical size and horizontal size is displayed on the display 31 as an optotype and guided to the eye E to be inspected. For example, when the target luminous flux is distorted, even if the grid BF of the basic shape shown by the dotted line is displayed on the display 31, it seems that the grid TF of the deformed shape shown by the solid line is projected on the eye E to be inspected. That is, it seems that a grid whose vertical size and horizontal size are deformed due to the distortion of the target luminous flux is projected on the eye E to be inspected. Further, it seems that a grid moved in the rotational direction about the center P of the optotype is projected on the eye E to be inspected. For example, in FIG. 11, the size in the vertical direction is smaller than the size in the vertical direction and the size in the horizontal direction is larger than the grid BF of the basic shape, and the grid TF having a deformed shape rotated counterclockwise around the center P of the optotype is It looks like it is displayed on the display 31. The grid (target) projected on the eye E is not necessarily deformed in all of the vertical, horizontal, and rotational directions, but at least one of them is deformed.

Therefore, for example, the control unit 70 sets a correction amount for correcting the distortion of the target luminous flux. For example, the memory 75 may store a correction table for acquiring a correction amount for correcting the distortion of the target luminous flux. Further, for example, the memory 75 may store an arithmetic expression for calculating a correction amount for correcting the distortion of the target luminous flux. For example, such a correction table and an arithmetic expression may be created by conducting an experiment or a simulation in advance. For example, the control unit 70 sets a correction amount for correcting the distortion of the target luminous flux based on at least one of the correction table and the calculation formula.

Further, for example, the control unit 70 corrects the distortion of the target luminous flux based on the set correction amount. FIG. 12 is a diagram illustrating correction of distortion of the luminous flux. In FIG. 12, the grid (target) displayed on the display 31 is represented by a dotted line, and the grid (target) projected on the eye E to be inspected is represented by a solid line. For example, as described with reference to FIG. 11, even if the grid BF having a basic shape is displayed on the display 31, the target luminous flux is distorted, so that the grid TF having a deformed shape is projected on the eye E to be inspected. For example, the control unit 70 displays on the display 31 an optotype for canceling the distortion of the optotype luminous flux that changes due to the correction of the synthetic astigmatism component based on the set correction amount. For example, in this embodiment, the control unit 70 has a larger vertical size and a smaller horizontal size than the grid BF of the basic shape, and is further rotated clockwise around the center P of the optotype. The grid RF is displayed on the display 31 in advance. As a result, the distortion of the target luminous flux guided toward the eye E to be inspected is corrected. That is, the correction grid RF displayed on the display 31 is distorted in its luminous flux, but the grid BF of the basic shape is projected on the eye E to be inspected.

Although not described in this embodiment, a correction grid RF that considers not only the distortion that deforms in the vertical, horizontal, and rotational directions of the optotype but also the distortion that deforms into a pincushion type or a barrel shape is displayed. It may be displayed in 31.

As described above, for example, the subjective eye examination device in the present embodiment is based on a first optical aberration component generated by the subjective measuring means and a second optical aberration component generated by the optical characteristics of the eye to be inspected. A correction amount for correcting the third optical aberration component is set, and the third optical aberration component is corrected based on the correction amount. This makes it possible to reduce the optical aberration component generated during the subjective measurement and accurately measure the optical characteristics of the eye to be inspected.

For example, in this embodiment, as the correction amount for correcting the third optical aberration component, the correction amount for correcting the synthetic optical aberration component in which the first optical aberration component and the second optical aberration component are combined is used. Set. Further, for example, in the present embodiment, the third optical aberration component is corrected by correcting the synthetic optical aberration component based on the correction amount for correcting the synthetic optical aberration component. Therefore, it is not necessary to set each correction amount for each optical aberration component, and the third optical aberration component can be easily corrected.

For example, in this embodiment, as the correction amount for correcting the third optical aberration component, a correction amount for correcting the first optical aberration component, a correction amount for correcting the second optical aberration component, and a correction amount for correcting the second optical aberration component. Are set respectively. This makes it possible to set the correction amount according to each optical aberration component. That is, for example, it is possible to set a correction amount for the first optical aberration component and not set a correction amount for the second optical aberration component.

For example, in the present embodiment, the third optical is corrected by performing the correction based on both the correction amount for correcting the first optical aberration component and the correction amount for correcting the second optical aberration component. Aberration components are corrected. That is, using one correction unit, correction is performed based on a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component. This makes it possible to simplify the configuration of the device as compared with the case where a plurality of correction units are used.

For example, in this embodiment, the first correction unit that performs correction based on the correction amount for correcting the first optical aberration component and the correction amount based on the correction amount for correcting the second optical aberration component are performed. The second correction unit corrects the third optical aberration component. That is, the third optical aberration component is corrected using the two correction units. As a result, each optical aberration component can be corrected separately. For example, the first optical aberration component can be corrected and the second optical aberration component cannot be corrected.

For example, in this embodiment, the distortion of the luminous flux generated by correcting the third optical aberration component is corrected. As a result, it is possible to perform subjective measurement with the distortion of the luminous flux reduced and to accurately acquire the optical characteristics of the eye to be inspected.

<Example of transformation>
In this embodiment, as the correction amount for correcting the third optical aberration component, the correction amount for correcting the synthetic optical aberration component in which the first optical aberration component and the second optical aberration component are combined is used. The configuration to be set has been described as an example, but the present invention is not limited to this. For example, as a correction amount for correcting the third optical aberration component, a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component are set respectively. It may be.

For example, in this case, a third correction amount based on both a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component using one correction unit. The optical aberration component may be corrected. For example, in this embodiment, either the astigmatism correction optical system 63 or the correction optical system 90 can be used as one correction unit. Of course, instead of using these optical systems in combination, a correction unit may be provided separately. For example, this makes it possible to correct the first optical aberration component generated by the subjective measuring means and the second optical aberration component generated by the optical characteristics of the eye E to be inspected.

Further, for example, in this case, the first correction unit that performs the correction based on the correction amount for correcting the first optical aberration component and the correction based on the correction amount for correcting the second optical aberration component are performed. The third optical aberration component may be corrected by using the second correction unit. For example, in this embodiment, the astigmatism correction optical system 63 can be used as the first correction unit, and the correction optical system 90 can be used as the second correction unit. Of course, the correction optical system 90 can be used as the first correction unit, and the astigmatism correction optical system 63 can be used as the second correction unit. Of course, instead of using these optical systems in combination, a correction unit may be provided separately. For example, this also makes it possible to correct the first optical aberration component generated by the subjective measuring means and the second optical aberration component generated by the optical characteristics of the eye E to be inspected.

For example, in this embodiment, the case where the target luminous flux irradiated to the concave mirror 85 changes depending on the correction power of the correction optical system 60 and the first optical aberration component is generated has been described as an example, but the present invention is limited to this. Not done. For example, in this embodiment, when the alignment state of the eye to be inspected E changes (that is, when the eye to be inspected E is displaced in at least one of the X direction, the Y direction, and the Z direction), the deflection mirror 81 and the measuring means 7 are used. Since the alignment is adjusted by moving together, the reflection position or the reflection area of the optometric luminous flux on the concave mirror 85 changes. Further, for example, in the present embodiment, when the convergence angle of the target luminous flux changes (that is, when the convergence angle of the left and right eyes to be examined is changed), the reflection angle of the deflection mirror 81 is adjusted, so that the concave mirror 85 is used. The reflection position or reflection area of the target luminous flux in. Therefore, for example, the memory 75 is for correcting a third optical aberration component based on the first optical aberration component generated by the alignment state of the eye E to be inspected and the second optical aberration component of the eye E to be inspected. The correction table or the arithmetic expression may be stored. Further, for example, in the memory 75, a correction for correcting a third optical aberration component based on the first optical aberration component generated by the convergence angle of the target luminous flux and the second optical aberration component of the eye E to be inspected. A table or an arithmetic expression may be stored. For example, the control unit 70 can appropriately change the correction amount according to various conditions by using these correction tables.

In this embodiment, a configuration in which the third optical aberration component is obtained by using the conceptual diagram as shown in FIG. 9 and the correction amount thereof is set is given as an example, but the present invention is not limited to this. Of course, the third optical aberration component may be obtained by a method different from the conceptual diagram.

In this embodiment, the astigmatism component has been described as an example as the optical aberration component, but the present invention is not limited to this. For example, the optical aberration component may be a spherical aberration component. In this case, a correction for correcting the third spherical aberration component based on the first spherical aberration component generated by the subjective measuring means and the second spherical aberration component generated by the spherical power of the eye E to be inspected. The amount is set, and the third spherical aberration component is corrected based on this. For example, the correction of the spherical aberration component may be performed by moving the display 31 in the optical axis L2 direction.

In this embodiment, a configuration for correcting the third optical aberration component by setting a correction amount for correcting the third optical aberration component has been described as an example, but the present invention is not limited to this. For example, the set correction amount is preferably a correction amount that can cancel the generated optical aberration component, but may be a correction amount that can reduce the generated optical aberration component. Further, it is not always necessary to correct the third optical aberration component as long as it does not interfere with the measurement. For example, in this case, the control unit 70 may determine whether or not to correct the third optical aberration component.

In this embodiment, a configuration for correcting the distortion of the luminous flux of the optotype by deforming the optotype displayed on the display 31 in advance has been described as an example, but the present invention is not limited to this. For example, in this embodiment, the distortion of the luminous flux may be corrected by moving the optical member based on the set correction amount. For example, in this case, the optical member included in the projection optical system 30 may be used, or the optical member may be separately provided. For example, when the distortion of the target light beam is corrected by using the optical member included in the projectile optical system 30, any one of the projectile lens 33, the projectile lens 34, the objective lens 14, and the like is tilted. It may be a configuration in which a plurality of lenses are combined and tilted. Further, for example, when the distortion of the target luminous flux is corrected by separately providing an optical member, a lens (convex lens, concave lens), a prism, a mirror, or the like is inserted and removed on the optical axis through which the target luminous flux passes. May be. For example, the distortion of the luminous flux may be corrected by the control unit 70 tilting or inserting / removing the optical member based on the correction amount set in this way.

In this embodiment, a configuration for correcting a third optical aberration component based on the first optical aberration component and the second optical aberration component when performing subjective measurement has been described as an example, but the present invention is limited to this. Not done. For example, when performing objective measurement, the configuration may be such that the third optical aberration component based on the first optical aberration component and the second optical aberration component is corrected. For example, the objective measurement may be performed using a subjective optometry device including objective measurement means, or may be performed using an objective optometry device including objective measurement means.

In this case, it has a projection optical system that projects the target light beam toward the eye to be inspected and an optical member that guides the target light beam to the eye to be inspected, and objectively examines the optical characteristics of the eye to be inspected. A third eye examination device including an objective measuring means for measuring, based on a first optical aberration component generated by the objective measuring means and a second optical aberration component generated by the optical characteristics of the eye to be inspected. A setting means for setting a correction amount for correcting the optical aberration component and a correction means for correcting the third optical aberration component based on the correction amount may be provided. For example, this causes complex optical aberrations generated by optical aberrations generated from each member constituting the optometry device in objective measurement and optical aberrations generated by the optical power (optical characteristics) of the eye to be inspected. After correction, it becomes possible to accurately measure the optical measurement of the eye to be inspected.

For example, in objective measurement, the light of a point light source image formed on the fundus of the eye to be inspected is taken out as a ring image, and the ring image is image-analyzed to obtain objective optical characteristics of the eye to be inspected E. Be measured. Therefore, for example, in the memory provided in the optometry device, how the shape of the ring image is deformed by the first optical aberration component and the second optical aberration component may be simulated and stored in advance. .. For example, the control unit included in the optometry device compares the shape of the ring image received by the image sensor in the objective measurement with the shape of the ring image stored in the memory, thereby performing the objective of the eye to be inspected. Optical characteristics can be obtained. Further, for example, the control unit compares the shape of the ring image received by the image sensor in the objective measurement with the shape of the ring image stored in the memory to obtain the first optical aberration component and the first optical aberration component. The third optical aberration component based on the two optical aberration components may be acquired.

Further, for example, the optometry apparatus may include an optical system capable of changing the optical characteristics of the optotype light beam in the optical path of the projection optical system. For example, such a configuration includes a configuration in which a lens is inserted and removed in the optical path of a projection optical system, a configuration in which two positive cylindrical lenses having the same rotatable focal length are arranged, and the like. For example, the control unit controls such an optical system at any time so as to cancel (or reduce) the third optical aberration component based on the first optical aberration component and the second optical aberration component. The correction may be performed.

It should be noted that the present disclosure is not limited to the apparatus described in this embodiment. For example, terminal control software (program) that performs the functions of the following embodiments is supplied to the system or device via a network or various storage media, and the control device (for example, CPU or the like) of the system or device reads the program. It is also possible to do it.

1 Subjective eye examination device 7 Measuring means 10 Objective measurement optical system 25 Subjective measurement optical system 30 Floodlight optical system 60 Correction optical system 70 Control unit 75 Memory 81 Deflection mirror 84 Reflection mirror 85 Concave mirror 90 Correction optical system 100 Front Eye image pickup optical system 111 1st astigmatism component 222 2nd astigmatism component 333 3rd astigmatism component

Claims (5)

A projection optical system that projects the luminous flux toward the eye to be inspected,
A correction optical system arranged in the optical path of the projection optical system and changing the optical characteristics of the target luminous flux, and a correction optical system.
An optical member that guides the target luminous flux corrected by the correction optical system to the eye to be inspected, and an optical member.
A optometric device comprising a conscious measuring means for consciously measuring the optical characteristics of the eye to be inspected.
A setting for setting a correction amount for correcting a third optical aberration component based on the first optical aberration component generated by the subjective measuring means and the second optical aberration component generated by the optical characteristics of the eye to be inspected. Means and
A correction means for correcting the third optical aberration component based on the correction amount, and
Distortion correction means for correcting the distortion of the target luminous flux generated by the correction means correcting the third optical aberration component, and
A subjective optometry device characterized by being equipped with. In the subjective optometry device of claim 1,
As the correction amount for correcting the third optical aberration component, the setting means obtains a correction amount for correcting the synthetic optical aberration component in which the first optical aberration component and the second optical aberration component are combined. A subjective optometry device characterized by setting. In the subjective optometry device of claim 2,
The correction means is a subjective optometry apparatus characterized in that the third optical aberration component is corrected by correcting the synthetic optical aberration component based on a correction amount for correcting the synthetic optical aberration component. In the subjective optometry device of claim 1,
The setting means includes, as a correction amount for correcting the third optical aberration component, a correction amount for correcting the first optical aberration component, a correction amount for correcting the second optical aberration component, and a correction amount for correcting the second optical aberration component. A subjective optometry device characterized by setting each. In the subjective optometry device of claim 4,
The correction means performs correction based on both a correction amount for correcting the first optical aberration component and a correction amount for correcting the second optical aberration component, thereby performing the third optical. A subjective optometry device characterized by correcting aberration components.

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