JP7375332B2 - Optometry equipment and programs - Google Patents

Description

The present disclosure relates to an optometric apparatus and an optometric program that measure optical characteristics of an eye to be examined.

As an example of an ophthalmometric device, a correction optical system is placed in the optical path of a projection optical system that projects a measurement light beam toward the subject's eye, and the correction optical system changes the optical characteristics of the measurement light beam. BACKGROUND ART A subjective optometry device is known that has a measuring section including an optical member that guides a measuring light beam (Patent Document 1). In an apparatus with such a configuration, during eye examination, alignment is performed between the eye to be examined and the measurement unit, and the optotype is presented to the eye to be examined while maintaining a conjugate relationship with the pupil of the eye to be examined. .

JP2018-171228A

Incidentally, in the apparatus having the above configuration, an optical member that guides the measurement light beam is fixedly arranged in the optical path of the projection optical system. The present inventors discovered that when the measurement unit is moved relative to the eye to be examined during alignment, changes in the distance between the fixedly arranged optical member and the measurement unit, etc. affect the measurement light flux that enters the eye to be examined. We found that the divergence-convergence angle changes. If the angle of divergence and convergence of the measurement light beam changes, the optical characteristics of the eye to be examined may not be appropriately measured.

In view of the above-mentioned conventional technology, the technical problem of the present disclosure is to provide an optometry device and an optometry program that can accurately measure the optical characteristics of an eye to be examined.

In order to solve the above problems, the present disclosure is characterized by having the following configuration.
(1) An optometry apparatus according to a first aspect of the present disclosure includes a measuring means having at least a light projection optical system that projects a measurement light beam toward an eye to be examined; a fixed optical member that guides the measurement light flux from the light projecting optical system; and a fixed optical member that guides the measurement light flux from the light projecting optical system; An optometry apparatus for measuring characteristics, comprising an acquisition means for acquiring an eye refractive power of the eye to be examined or a correction power set for correcting the eye refractive power of the eye to be examined by a correction means; a detection means for detecting positional relationship information between the eye test and the pupil conjugate position in the projection optical system; a movement control means for controlling a drive means to move the measurement means with respect to the eye to be examined so as to maintain a conjugate relationship; and a fixed optical member that changes as the measurement means is moved by the movement control means. a correction means for correcting a change in the divergence and convergence angle of the measurement light beam due to the distance between the measurement means , and the correction means corrects the eye refractive power or the correction obtained by the acquisition means. It is characterized in that a change in the divergence and convergence angle of the measurement light beam is corrected based on the degree of power and the positional relationship information detected by the detection means.
(2) An optometry program according to a second aspect of the present disclosure includes a measurement means having at least a light projection optical system that projects a measurement light beam toward an eye to be examined; An optometry program used in an optometry apparatus that measures the optical characteristics of the eye to be examined, the fixed optical member comprising: a fixed optical member that guides the measurement light flux from the projection optical system; , an obtaining step executed by a processor of the optometry apparatus to obtain the eye refractive power of the eye to be examined or a correction power set for correcting the eye refractive power of the eye to be examined by a correcting means; , a detection step of detecting positional relationship information between the eye to be examined and a pupil conjugate position in the projection optical system; a movement control step of controlling a drive means to move the measurement means with respect to the eye to be examined so as to maintain a conjugate relationship with the position; and a movement control step of changing the fixation as the measurement means is moved by the movement control step. causing the optometry apparatus to execute a correction step of correcting a change in the divergence and convergence angle of the measurement light beam due to the distance between the optical member and the measurement means, and the correction step is performed by The method is characterized in that a change in the divergence/convergence angle of the measuring light beam is corrected based on the eye refractive power or the corrected power and the positional relationship information detected in the detection step.

It is an external view of an optometry device. It is a figure showing a measurement part. FIG. 2 is a schematic configuration diagram of the inside of the optometry device viewed from the front. FIG. 2 is a schematic configuration diagram of the inside of the optometry device viewed from the side. FIG. 2 is a schematic configuration diagram of the inside of the optometry device viewed from above. FIG. 2 is a diagram showing a control system of the optometry device. It is a figure explaining the pupil conjugate position in a measurement part. It is a figure explaining the change of the divergence convergence angle of an optotype light beam. It is a figure explaining correction of optotype light flux.

<Summary>
An overview of an optometry apparatus according to an embodiment of the present disclosure will be described. Note that the items classified in <> below can be used independently or in conjunction.

The optometry apparatus in this embodiment measures the optical characteristics of the eye to be examined. The optical characteristics of the eye to be examined may be the subjective optical characteristics of the eye to be examined, and in this case, ocular refractive power (e.g., spherical power, cylindrical power, astigmatic axis angle, etc.), contrast sensitivity, binocular Examples include at least one of visual functions (for example, tropism, stereoscopic vision function, etc.). Further, the optical characteristics of the eye to be examined may be objective optical characteristics of the eye to be examined. At least one of the following may be mentioned: length, corneal shape, etc.

The optometry device includes a measuring means (for example, a measuring section 7). The measuring means includes at least a light projecting optical system that projects a measuring light beam toward the eye to be examined. For example, the optometry apparatus may include a light projection optical system and a subjective measurement means (for example, the subjective measurement optical system 25) that subjectively measures the optical characteristics of the eye to be examined. Further, the optometry apparatus may include an objective measurement means (for example, an objective measurement optical system 10) that has a light projecting optical system and objectively measures the optical characteristics of the eye to be examined. Note that the optometry device may include both a subjective measurement device and an objective measurement device.

<Subjective measurement means>
The subjective measurement means may include a light projection optical system (eg, light projection optical system 30). The light projection optical system in the subjective measurement means projects a target light beam toward the eye to be examined. The light projection optical system may include at least one optical member that guides the optotype light flux projected toward the eye to be examined.

Further, the subjective measurement means may include a corrective optical system (for example, corrective optical system 60). The correction optical system is disposed in the optical path of the projection optical system, and changes the optical characteristics (for example, at least one of spherical power, cylindrical power, cylindrical axis, polarization characteristics, aberration amount, etc.) of the optotype light beam. let

<Light projection optical system>
The light projection optical system may include an optotype presenting means. The optotype presenting means presents an optotype to the eye to be examined. In this case, the projection optical system projects the optotype light flux emitted from the optotype presenting means toward the eye to be examined. For example, a display (for example, the display 31) can be used as the optotype presenting means. The display may be LCOS (Liquid crystal on silicon), LCD (Liquid Crystal Display), organic EL (Electro Luminescence), or the like. Furthermore, for example, a light source and a DMD (Digital Micromirror Device) can be used as the optotype presenting means. Generally, DMDs have high reflectance and are bright. Therefore, compared to the case where an LCD using polarized light is used, the amount of light of the optotype light beam can be maintained. Further, for example, as the optotype presenting means, a visible light source for presenting an optotype and an optotype plate can be used. The optotype board is a rotatable disc plate and may have a plurality of optotypes. In such a case, the optotype board is rotated by a motor or the like, and the optotypes are switched and arranged on the optical path through which the optotype light flux is guided to the subject's eye.

<Correction optical system>
The correction optical system may have any configuration as long as it can change the optical characteristics of the optotype light beam.

For example, the corrective optical system may be able to change at least one of the spherical power, cylindrical power, astigmatic axis angle, etc. of the optotype light beam by controlling optical elements. The optical element may be at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, a variable focus lens, and the like. Of course, optical elements different from these optical elements may be used.

Further, for example, the corrective optical system may correct the spherical power of the eye to be examined by optically changing the presentation position (presentation distance) of the optotype with respect to the eye to be examined. In this case, the optotype display means may be moved in the optical axis direction in order to optically change the presentation position of the optotype. Further, in this case, in order to optically change the presentation position of the optotype, an optical element (for example, a spherical lens, etc.) disposed in the optical path may be moved in the optical axis direction.

The corrective optical system is a combination of a configuration for controlling optical elements, a configuration for moving an optotype display means in the optical axis direction, and a configuration for moving an optical element disposed in the optical path in the optical axis direction. It may be a configuration.

In this embodiment, the corrective optical system may be an eye refractive power measurement unit (phoropter) that arranges an optical element in front of the eye to be examined. For example, the eye refractive power measurement unit may have a variable focus lens and may be configured to change the refractive power of the variable focus lens. Further, for example, the eye refractive power measurement unit includes a lens disk in which a plurality of optical elements are arranged on the same circumference, and a driving means (for example, a motor) for rotating the lens disk. The optical element may be electrically switched by driving the optical element. Of course, the eye refractive power measuring unit may have a configuration including a variable focus lens, a lens disk, and a driving means. When these configurations are provided, the target light beam directed toward the eye to be examined is projected via the eye refractive power measurement unit.

Furthermore, in the present embodiment, the corrective optical system includes an optical element disposed between the optotype display means and the optical member for guiding the optotype light flux from the projection optical system toward the subject's eye. , the optical characteristics of the optotype light beam may be changed by controlling an optical element. That is, the corrective optical system may be configured as a phantom lens refractometer (phantom corrective optical system). In this case, for example, the optotype light flux corrected by the correction optical system is guided to the subject's eye via the optical member.

<Objective measurement means>
The objective measuring means may include a projection optical system (eg, projection optical system 10a). The light projection optical system in the objective measuring means projects a measurement light beam onto the fundus of the eye to be examined. Further, the objective measuring means may include a light receiving optical system (for example, the light receiving optical system 10b). The light-receiving optical system receives a fundus-reflected light beam that is a measurement light beam reflected on the fundus of the eye to be examined.

<Fixed optical member>
The optometry device includes a fixed optical member. The fixed optical member is a fixed optical member that is fixedly arranged in the optical path of the light projecting optical system, and is a fixed optical member that guides the measurement light beam from the light projecting optical system. The fixed optical member may be a fixed optical member for guiding the measuring light flux that is projected onto the eye to be examined into the light projecting optical system and further corrected into the corrective optical system. For example, as the fixed optical member, at least one of a concave mirror (for example, concave mirror 85), a lens, etc. can be used.

In addition, in this embodiment, by using a concave mirror as a fixed optical member, the optotype presented to the eye to be examined is optically arranged at a predetermined examination distance. Since it is not necessary to arrange predetermined members at actual distances, the device can save space.

<Acquisition means>
The optometry device may include an acquisition means (for example, the control unit 70). The acquisition means acquires optical characteristics of the eye to be examined. The acquisition means may acquire, as the optical characteristics of the eye to be examined, an optical characteristic based on a measurement result measured by a subjective measurement means or an objective measurement means in an optometrist. Further, the acquisition means may acquire the optical characteristics by receiving the optical characteristics based on the measurement results measured by a device different from the optometry device. Further, the acquisition means may acquire, as the optical characteristics, a value input by the examiner's operation of the operation means (for example, the monitor 4). Note that the acquisition means obtains, as the optical characteristics of the eye to be examined, a correction power (for example, at least one of spherical power, cylindrical power, astigmatic axis angle, etc.) for correcting the eye to be examined based on these optical characteristics. The configuration may be such that the information is acquired.

<Detection means>
The optometry apparatus includes a detection means (for example, a control section 70). The detection means detects positional relationship information between the eye to be examined and a pupil conjugate position in the projection optical system. The positional relationship information between the eye to be examined and the pupil conjugate position may be the respective positional coordinates of the eye to be examined (for example, the corneal apex position or the pupil position) and the pupil conjugate position. Further, the positional relationship information between the eye to be examined and the pupil conjugate position may be the distance between the eye to be examined and the pupil conjugate position. Note that the detection means may detect positional relationship information between the eye to be examined and the pupil conjugate position by detecting at least one of the eye to be examined and the pupil conjugate position.

For example, the detection means may be configured to detect the amount of deviation based on positional relationship information between the eye to be examined and the pupil conjugate position. Further, for example, the detection means may be configured to detect the alignment state between the eye to be examined and the measuring means, which is determined from the amount of deviation based on the positional relationship information between the eye to be examined and the pupil conjugate position. As an example, in this case, the alignment state may be detected by setting a reference position where alignment is appropriate and detecting the amount of deviation of the eye to be examined from the reference position. Note that, for example, the reference position may be a position where the pupil position of the subject's eye matches the pupil conjugate position.

In this embodiment, the distance from the eye to be examined to a predetermined member (for example, presentation window 3, measurement unit 7, etc.) when the eye to be examined is aligned to the reference position may be used as the working distance. In this case, the reference position may be a position for setting the working distance between the eye to be examined and the optometry device to an appropriate working distance, or may be a position where the pupil position of the emmetropic eye matches the pupil conjugate position. .

<Movement control means>
The optometry apparatus includes a movement control means (for example, a control section 70). The movement control means controls the drive means (for example, the left eye drive section 9L, the right eye drive section 9R) so as to maintain a conjugate relationship between the eye to be examined and the pupil conjugate position based on the position information detected by the detection means. ) to move the measurement means relative to the eye to be examined. As a result, even if a positional shift occurs in the eye to be examined, the eye to be examined and the pupil conjugate position of the light projection optical system are aligned, and the conjugate relationship between the eye to be examined and the pupil conjugate position is maintained. The distance between the two will be automatically adjusted. Therefore, alignment of the eye to be examined and the measuring means is easily performed.

For example, in this embodiment, the movement control means may be configured to move the entire measuring means with respect to the eye to be examined. Furthermore, for example, in the present embodiment, the movement control means may be configured to move at least some members of the light projection optical system housed in the measurement means with respect to the eye to be examined. The movement control means may have any configuration as long as it can move the pupil conjugate position of the projection optical system.

<Correction means>
The optometry apparatus includes a correction means (for example, the control section 70). The correcting means corrects a change in the divergence/convergence angle of the measurement light beam due to the distance between the fixed optical member and the measuring means, which changes due to the movement of the measuring means by the moving means. That is, the correction means corrects a change in the divergence/convergence angle of the measurement light beam due to a changing magnification (that is, pupil magnification) by maintaining a conjugate relationship between the eye to be examined and the pupil conjugate position. For example, the divergence/convergence angle of the measurement light beam may be any angle representing the divergence angle at which the measurement light beam diverges to the convergence angle at which the measurement light beam converges.

In other words, the correction means corrects a change in the divergence and convergence state of the measuring light beam caused by the distance between the fixed optical member and the measuring means, which changes due to the movement of the measuring means by the moving means. Note that the divergence/convergence state of the measurement light beam refers to any state such as a divergent light beam in which the measurement light beam diverges, a parallel light beam in which the measurement light beam is parallel, a convergence light beam in which the measurement light beam converges, or the like.

In this embodiment, the correction means may be configured to correct the divergence and convergence angle of the measurement light beam so that it is maintained before and after the measurement means moves with respect to the eye to be examined. As an example, the correction means maintains the divergence and convergence angle of the measurement light beam in a state in which alignment of the measurement means with respect to the eye to be examined is completed and in a state in which the measurement means is moved in response to a positional shift of the eye to be examined that occurs thereafter. It may be corrected so that Thereby, it is possible to make an appropriate measurement light beam incident on the eye to be examined, and to obtain the optical characteristics of the eye to be examined with high accuracy.

The correction means may correct the optical characteristics of the measurement light beam based on the optical characteristics acquired by the acquisition means and the positional relationship information between the eye to be examined and the pupil conjugate position detected by the detection means. good. In this case, the correction means corrects the optical characteristics of the measurement light beam based on the objective optical characteristics of the eye to be examined acquired by the acquisition means and the positional relationship information between the eye to be examined and the pupil conjugate position. You can do it like this. Furthermore, in this case, the correction means uses the subjective optical characteristics of the eye to be examined (or the correction power for correcting the eye to be examined) acquired by the acquisition means and the positional relationship information between the eye to be examined and the pupil conjugate position. Based on this, the optical characteristics of the measurement light beam may be corrected. As a result, it is possible to easily correct changes in the divergence and convergence angle of the measurement light beam, which vary in degree depending on the optical characteristics of the eye to be examined, and to accurately acquire the optical characteristics of the eye to be examined.

In this embodiment, the correction means may correct the optical characteristics of the measurement light beam by controlling a correction optical system included in the subjective measurement means. Thereby, there is no need to provide a new member, the divergence and convergence angle of the measurement light beam can be corrected with a simple configuration, and the optical characteristics of the eye to be examined can be accurately acquired.

The correction means may include a correction amount setting means for setting a correction amount for correcting the divergence/convergence angle of the measurement light beam. The correction amount setting means may be configured to set the correction amount in advance based on the optical characteristics of the eye to be examined, the conjugate position of the eye to be examined, the pupil conjugate position, and the positional relationship information. For example, in this case, the correction amount setting means may calculate the correction amount by arithmetic processing based on the optical characteristics of the eye to be examined, the conjugate position of the eye to be examined, the pupil, and the positional relationship information. Further, for example, in this case, the correction amount setting means may load a correction table based on the optical characteristics of the eye to be examined, the conjugate position of the eye to be examined, the pupil, and the positional relationship information from the storage means (for example, the memory 75). Then, the correction amount may be obtained.

For example, the correction means may correct the divergence and convergence angle of the measurement light beam based on the correction amount set by the correction amount setting means. Further, the correction means may directly correct the divergence/convergence angle of the measurement light beam using arithmetic processing or a correction table without setting a correction amount.

Note that the present disclosure is not limited to the device described in this embodiment. For example, terminal control software (program) that performs the functions of the following embodiments is supplied to a system or device via a network or various storage media, and a control device (such as a CPU) of the system or device reads the program. It is also possible to execute

<Example>
An example of the subjective optometry device according to the present embodiment will be described.

FIG. 1 is an external view of the subjective optometry device. For example, a subjective optometry device (hereinafter referred to as an optometry device) 1 includes a housing 2, a presentation window 3, a monitor 4, a jaw rest 5, a base 6, an anterior segment imaging optical system 100, and the like.

The housing 2 is fixed to a base 6. A measuring section 7, which will be described later, is provided inside the housing 2. The presentation window 3 is used to present an optotype to the subject's eye (tested eye E). The monitor 4 displays the measurement results of the optical characteristics of the eye E to be examined. The monitor 4 is a display with a touch panel function. That is, the monitor 4 functions as an operation unit (controller). Note that the monitor 4 does not need to be of a touch panel type, and may have a configuration in which the monitor 4 and the operation section are provided separately. In this case, at least one of a mouse, joystick, keyboard, mobile terminal, etc. may be used as the operation unit. A signal corresponding to an operation instruction input from the monitor 4 is output to a control section 70, which will be described later. The chin rest 5 is fixed to a base 6. The chin rest 5 is used to maintain a constant distance between the eye E and the optometric apparatus 1. Note that the present invention is not limited to the chin rest 5, but may be configured to use a forehead rest, a face rest, or the like to maintain a constant distance between the eye E and the optometric apparatus 1.

The anterior segment imaging optical system 100 is used to image the subject's face. The anterior segment imaging optical system 100 includes an image sensor and a lens (not shown). The anterior eye imaging optical system 100 images at least one of the left eye EL and the right eye ER to obtain an anterior eye image. Imaging of the anterior segment by the anterior segment imaging optical system 100 is controlled by a control unit 70, which will be described later. Further, the anterior segment image acquired by the anterior segment imaging optical system 100 is analyzed by a control unit 70, which will be described later.

<Measurement part>
The optotype light flux from the measurement unit 7 is guided to the eye E to be examined via the presentation window 3. The measurement section 7 includes a left eye measurement section 7L and a right eye measurement section 7R. The measurement unit 7 includes a left and right pair of subjective measurement units, which will be described later, and a left and right pair of objective measurement units, which will be described later. The left eye measurement section 7L and the right eye measurement section 7R in this embodiment are constructed from the same member. Of course, at least a portion of the left eye measurement section 7L and the right eye measurement section 7R may be made of different members.

FIG. 2 is a diagram showing the measuring section 7. As shown in FIG. In FIG. 2, as the measurement unit 7, a left eye measurement unit 7L is taken as an example. The right eye measurement section 7R has the same configuration as the left eye measurement section 7L, and therefore will be omitted. For example, the left eye measurement section 7L includes a subjective measurement optical system 25, an objective measurement optical system 10, a first target projection optical system 45, a second target projection optical system 46, an observation optical system 50, and the like.

<Subjective measurement optical system>
The subjective measurement optical system 25 is used as part of the configuration of a subjective measurement unit that subjectively measures the optical characteristics of the eye E to be examined (details will be described later). In this embodiment, a subjective measuring unit that measures the eye refractive power of the eye E to be examined is taken as an example of the optical characteristics of the eye E to be examined. In addition to the eye refractive power, the optical characteristics of the eye E to be examined may include contrast sensitivity, binocular vision function (for example, tropism, stereoscopic vision function, etc.). 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.

<Light projection optical system>
The light projection optical system 30 projects a target light beam toward the eye E to be examined. For example, the light projection optical system 30 includes a display 31, a light projection lens 33, a light projection lens 34, a reflecting mirror 36, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like.

The display 31 displays visual targets (fixation targets, test visual targets, etc.). The optotype light beam emitted from the display 31 is projected onto the eye E through the optical members 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. be done.

<Correction optical system>
The correction optical system 60 is arranged in the optical path of the projection optical system 30. Further, the correction optical system 60 changes the optical characteristics of the optotype light flux emitted from the display 31. For example, the correction optical system 60 includes an astigmatism correction optical system 63, a drive mechanism 39, and the like.

The astigmatism correction optical system 63 is used to correct the cylindrical power and astigmatism axis angle of the eye E to be examined. The astigmatism correction optical system 63 is arranged between the light projecting lens 33 and the light projecting lens 34. The astigmatism correcting 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 each rotate independently about the optical axis L2 by driving the rotation mechanism 62a and the rotation mechanism 62b. In this embodiment, the astigmatism correcting optical system 63 is described using a cylindrical lens 61a and a cylindrical lens 61b as an example, but the present invention is not limited to this. The astigmatism correction optical system 63 may have any configuration as long as it can correct the cylindrical power, astigmatism axis angle, and the like. For example, a corrective lens may be inserted into and removed from the optical path of the projection optical system 30.

The drive mechanism 39 consists of a motor and a slide mechanism. The drive mechanism 39 moves the display 31 in the optical axis L2 direction by moving a drive unit 95, which will be described later, in the optical axis L2 direction. In the objective measurement, by moving the display 31, the subject's eye E can be fogged. In the subjective measurement, by moving the display 31, the presentation position (presentation distance) of the optotype with respect to the eye E to be examined can be optically changed, and the spherical power of the eye E to be examined can be corrected. That is, in this embodiment, a spherical correction optical system that corrects the spherical power of the eye E by changing the position of the display 31 is configured. Note that the configuration of the spherical correction optical system may be different from this embodiment. For example, spherical power may be corrected by arranging multiple optical elements in the optical path. Further, for example, the spherical power may be corrected by placing a lens in the optical path and moving the lens in the optical axis direction.

In this embodiment, a corrective optical system for correcting spherical power, cylindrical power, and astigmatic axis angle is exemplified. However, the corrective optical system may correct other optical properties (eg, prism values, etc.). By correcting the prism value, the optotype light beam is appropriately projected onto the eye to be examined even if the eye to be examined is a strabismus eye.

Further, in this embodiment, an astigmatism correcting optical system 63 that corrects the cylindrical power and the astigmatic axis angle, and a drive mechanism 39 that corrects the spherical power are separately provided. However, spherical power, cylindrical power, and astigmatic axis angle may be corrected by the same configuration. For example, spherical power, cylindrical power, and astigmatic axis angle may be corrected by an optical system that modulates the wavefront. In addition, a lens disk in which a plurality of optical elements (for example, at least one of a spherical lens, a cylindrical lens, and a dispersion prism) are arranged on the same circumference, and an actuator that rotates the lens disk are used as a corrective optical system. It's okay to be hit. In this case, various optical characteristics are corrected by rotating the lens disk and switching the optical elements located on the optical axis L2. Further, an optical element (for example, at least one of a cylindrical lens, a cross cylinder lens, a rotary prism, etc.) arranged on the optical axis L2 may be rotated by an actuator.

<Correction optical system>
The correction optical system 90 is arranged between the objective lens 14 and the deflection mirror 81 (described later). The correction optical system 90 is used to correct optical aberrations (eg, astigmatism, etc.) that occur during subjective measurements. The correction optical system 90 corrects astigmatism by adjusting the cylindrical power and the astigmatic axis angle. The correction optical system 90 is composed of two positive cylindrical lenses 91a and 91b having the same focal length. The cylindrical lens 91a and the cylindrical lens 91b each rotate independently about the optical axis L3 by driving the rotation mechanism 92a and the rotation mechanism 92b. 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 have any configuration as long as it can correct astigmatism. For example, in this case, a correction lens may be inserted or removed from the optical axis L3.

<Objective measurement optical system>
The objective measurement optical system 10 is used as part of the configuration of an objective measurement unit that objectively measures the optical characteristics of the eye to be examined (details will be described later). In this embodiment, the optical characteristics of the eye E to be examined will be described using an objective measuring unit that measures the eye refractive power of the eye E to be examined as an example. Note that the optical characteristics of the eye E to be examined may include, in addition to the eye refractive power, the axial length of the eye, the shape of the cornea, and the like. For example, the objective measurement optical system 10 includes a projection optical system 10a, a light receiving optical system 10b, and a correction optical system 90.

The projection optical system (projection optical system) 10a projects a spot-shaped measurement index onto the fundus of the eye E to be examined via the center of the pupil of the eye E to be examined. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hall mirror 13, a prism 15, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like.

The light source 11 emits a measurement light beam. The light source 11 has a conjugate relationship with the fundus of the eye E to be examined. The hole portion of the hall mirror 13 has a conjugate relationship with the pupil of the eye E to be examined. The prism 15 is a light beam deflecting member. The prism 15 is arranged at a position away from the conjugate position with the pupil of the eye E, and decenters the measurement light flux passing through the prism 15 with respect to the optical axis L1. The prism 15 is rotationally driven by a drive unit (motor) 23 around the optical axis L1. The dichroic mirror 35 shares the optical path of the objective measurement optical system 10 with the optical path of the subjective measurement optical system 25, which will be described later. That is, the dichroic mirror 35 makes the optical axis L1 of the objective measurement optical system 10 and the optical axis L2 of the subjective measurement optical system 25 coaxial. Dichroic mirror 29 is an optical path branching member. The dichroic mirror 29 reflects the measurement light flux from the projection optical system 10a and the measurement light flux from the subjective measurement optical system 25 and guides them to the eye E to be examined.

The light-receiving optical system 10b extracts the fundus-reflected light flux reflected from the fundus of the eye E to be examined in a ring shape through the periphery of the pupil of the eye E to be examined. For example, the light receiving optical system 10b includes an objective lens 14, a dichroic mirror 29, a dichroic mirror 35, a prism 15, a hall mirror 13, a relay lens 16, a mirror 17, a light receiving aperture 18, a collimator lens 19, a ring lens 20, an image sensor 22, Equipped with etc. The ring lens 20 includes a ring-shaped lens part and a light-shielding part in which a region other than the lens part is coated with a light-shielding coating. The ring lens 20 has an optically conjugate positional relationship with the pupil of the eye E to be examined. The light receiving aperture 18 and the image sensor 22 are in a conjugate relationship with the fundus of the eye E to be examined. The output from the image sensor 22 is input to the control section 70.

In this embodiment, a light source 11 included in the projection optical system 10a, a light receiving aperture 18, a collimator lens 19, a ring lens 20, and an image sensor 22 included in the light receiving optical system 10b, and a display 31 included in the light projecting optical system 30, are integrally movable in the optical axis direction by a drive mechanism 39. That is, the light source 11, the light-receiving aperture 18, the collimator lens 19, the ring lens 20, the image sensor 22, and the display 31 are synchronized as a drive unit 95, and the drive mechanism 39 moves them integrally. For example, the position to which the drive mechanism 39 has moved is detected by a potentiometer (not shown).

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 beam is incident on the image sensor 22 in each meridian direction. That is, by moving a part of the objective measurement optical system 10 in the direction of the optical axis L1 according to the spherical refractive error (spherical refractive power) of the eye E to be examined, the spherical refractive error is corrected, and the fundus of the eye E to be examined is corrected. The light source 11, the light-receiving aperture 18, and the image sensor 22 are made to be optically conjugate to each other. Note that the hall mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the eye E to be examined at a constant magnification, regardless of the amount of movement of the drive unit 95.

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

For example, the prism 15 is arranged on a common optical path of the projection optical system 10a and the light receiving optical system 10b. For example, since the reflected light flux from the fundus passes through the same prism 15 as the projection optical system 10a, the subsequent optical system performs reverse scanning as if there were no eccentricity of the projection light flux and reflected light flux (received light flux) on the pupil. be done.

Note that in this embodiment, the configuration of the objective measuring section can be changed. For example, the objective measurement unit is configured to project a ring-shaped measurement index onto the fundus from the periphery of the pupil, extract light reflected from the fundus from the center of the pupil, and cause the image sensor 22 to receive the ring-shaped reflected image of the fundus. You can leave it there. Further, the objective measurement unit may include a Shack-Hartmann sensor, or may include a phase difference type configuration that projects a slit.

<First target projection optical system and second target projection optical system>
For example, in this embodiment, the first target projection optical system 45 and the second target 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 target projection optical system 45 and the second target projection optical system 46 are not limited to this. For example, the first target projection optical system 45 and the second target projection optical system 46 may be provided on the cover of the housing 2. For example, in this case, the first target projection optical system 45 and the second target projection optical system 46 may be arranged around the presentation window 3.

For example, the first target projection optical system 45 includes a ring-shaped infrared light source arranged around the optical axis L3. For example, the first target projection optical system 45 emits near-infrared light for projecting an alignment target onto the cornea of the eye E to be examined. For example, the second target projection optical system 46 includes a ring-shaped infrared light source arranged at a different position from the first target projection optical system 45. In addition, in FIG. 2, for convenience, only a part (cross-sectional part) of the ring-shaped infrared light source in the first target projection optical system 45 and the second target projection optical system 46 is illustrated. In this embodiment, the first target projection optical system 45 projects an alignment target at infinity onto the cornea of the subject's eye. Further, the second target projection optical system 46 projects a finite alignment target onto the cornea of the subject's eye. Note that the alignment light emitted from the second target projection optical system 46 is also used as anterior segment photographing light for photographing the anterior segment of the eye to be examined by the observation optical system 50. Further, the light sources of the first target projection optical system 45 and the second target projection optical system 46 are not limited to ring-shaped light sources, but may be a plurality of point-shaped light sources, a line-shaped light source, or the like.

<Observation optical system>
The observation optical system (imaging optical system) 50 includes an objective lens 14, a dichroic mirror 29, an imaging lens 51, an imaging element 52, and the like. The dichroic mirror 29 transmits the anterior segment observation light and the alignment light. The imaging element 52 has an imaging surface disposed at a position substantially conjugate with the anterior segment of the eye E to be examined. The output from the image sensor 52 is input to the control section 70. As a result, an anterior segment image of the eye E to be examined is captured by the image sensor 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 cornea of the eye E by the first target projection optical system 45 and the second target projection optical system 46, and is controlled by the control unit 70. The position of the alignment target image is detected.

<Internal configuration of optometry device>
The internal configuration of the optometry device 1 will be described below. FIG. 3 is a schematic configuration diagram of the inside of the optometry apparatus 1 according to the present embodiment, viewed from the front direction (direction A in FIG. 1). FIG. 4 is a schematic configuration diagram of the inside of the optometry apparatus 1 according to the present embodiment, viewed from the side direction (direction B in FIG. 1). FIG. 5 is a schematic configuration diagram of the inside of the optometry apparatus 1 according to the present example viewed from the top direction (direction C in FIG. 1). Note that in FIGS. 4 and 5, only the optical axis of the left eye measurement section 7L is shown for convenience of explanation.

For example, the optometry device 1 includes a subjective measurement section and an objective measurement section. For example, in the subjective measurement unit and the objective measurement unit, the optotype light flux from the measurement unit 7 passes through an optical path that coincides with the optical axis L of an optical member (for example, a concave mirror 85 described later), and passes through the eye to be examined. The light may be guided. For example, in the subjective measurement unit and the objective measurement unit, the optotype light flux from the measurement unit 7 passes through an optical path deviating from the optical axis L of an optical member (for example, a concave mirror 85 described later) and is The light may be guided to the optometry clinic E. For example, in this embodiment, the optical axis L is an axis directed toward the spherical center of the concave mirror 85. In the following, a configuration in which the optotype light flux from the measurement unit 7 passes through a path deviating from the optical axis L of the concave mirror 85 will be exemplified. That is, the optotype light flux from the measurement unit 7 is irradiated obliquely with respect to the optical axis L of the concave mirror 85, and the reflected light flux is guided to the eye E to be examined.

For example, the subjective measuring section includes a measuring section 7, a deflection mirror 81, a driving mechanism 82, a driving section 83, a reflecting mirror 84, and a concave mirror 85. Note that the subjective measurement section is not limited to this configuration. For example, a configuration that does not include the reflecting mirror 84 may be used. In this case, the optotype light flux from the measurement unit 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Further, for example, a configuration including a half mirror may be used. In this case, the optotype light flux from the measurement unit 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via a half mirror, and the reflected light flux may be guided to the eye E to be examined. . In this embodiment, a concave mirror 85 is disposed, but a convex lens may be disposed instead of the concave mirror 85.

For example, the objective measuring section includes a measuring section 7, a deflecting mirror 81, a reflecting mirror 84, and a concave mirror 85. Note that the objective measurement unit is not limited to this configuration. For example, a configuration that does not include the reflecting mirror 84 may be used. In this case, the optotype light flux from the measurement unit 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Further, for example, a configuration including a half mirror may be used. In this case, the optotype light flux from the measurement unit 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via a half mirror, and the reflected light flux may be guided to the eye E to be examined. . In this embodiment, a concave mirror 85 is disposed, but a convex lens may be disposed instead of the concave mirror 85.

For example, the optometric apparatus 1 includes a left eye drive section 9L and a right eye drive section 9R, and can move the left eye measurement section 7L and the right eye measurement section 7R in the X direction, respectively. For example, by moving the left eye measurement section 7L and the right eye measurement section 7R, the distance between the deflection mirror 81 and the measurement section 7 is changed, and the presentation position of the optotype light beam in the Z direction is changed. Ru. Thereby, the optotype light flux corrected by the correction optical system 60 is guided to the eye E to be examined, and the measurement is performed so that an image of the optotype light flux corrected by the correction optical system 60 is formed on the fundus of the eye E to be examined. The portion 7 can be adjusted in the Z direction.

For example, the deflection mirror 81 includes a right eye deflection mirror 81R and a left eye deflection mirror 81L, which are provided in a pair on the left and right sides, respectively. For example, the deflection mirror 81 is placed between the corrective optical system 60 and the eye E to be examined. That is, the corrective optical system 60 in this embodiment has a left eye corrective optical system and a right eye corrective optical system provided in a pair on the left and right, and the left eye deflection mirror 81L is a left eye corrective optical system. The deflection mirror 81R for the right eye is arranged between the optical system and the left eye EL, and the deflection mirror 81R for the right eye is arranged between the corrective optical system for the right eye and the right eye ER. For example, it is preferable that the deflection mirror 81 is placed at a conjugate position of the pupil.

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

For example, the drive mechanism 82 includes a motor (drive section) or the like. For example, the drive mechanism 82 includes a drive mechanism 82L for driving a left eye deflection mirror 81L, and a drive mechanism 82R for driving a right eye deflection mirror 81R. For example, the deflection mirror 81 is rotated by driving the drive mechanism 82 . For example, the drive mechanism 82 rotates the deflection mirror 81 about a rotation axis in the horizontal direction (X direction) and a rotation axis in the vertical direction (Y direction). That is, the drive mechanism 82 rotates the deflection mirror 81 in the XY directions. Note that the deflection mirror 81 may be rotated in either the horizontal direction or the vertical direction.

For example, the drive unit 83 includes a motor or the like. For example, the drive unit 83 includes a drive unit 83L for driving a deflection mirror 81L for the left eye, and a drive unit 83R for driving the deflection mirror 81R for the right eye. For example, the deflection mirror 81 is moved in the X direction by driving the drive unit 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 distance between the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye is changed. The distance in the X direction between the left eye optical path and the right eye optical path can be changed in accordance with the interpupillary distance of E.

Note that, 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 may be mentioned 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 are provided in the left eye optical path). 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, by rotating the deflection mirror 81, the apparent light beam for forming the image of the corrective optical system 60 in front of the subject's eye is deflected, thereby optically correcting the image formation position. can.

For example, the concave mirror 85 is shared by the right eye measurement section 7R and the left eye measurement section 7L. For example, the concave mirror 85 is shared by a right eye optical path that includes a right eye corrective optical system and a left eye optical path that includes a left eye corrective optical system. That is, the concave mirror 85 is arranged at a position where it passes through both the right eye optical path including the right eye corrective optical system and the left eye optical path including the left eye corrective optical system. Of course, the concave mirror 85 does not have to be shared by the right eye optical path and the left eye optical path. That is, a concave mirror may be provided in each of the right eye optical path including the right eye corrective optical system and the left eye optical path including the left eye corrective optical system. For example, the concave mirror 85 guides the optotype light flux that has passed through the corrective optical system to the subject's eye E, and forms an image of the optotype light flux that has passed through the corrective optical system in front of the subject's eye E. In this embodiment, a 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, a lens, a plane mirror, or the like can be used as the optical member.

For example, the concave mirror 85 is used for both the subjective measurement section and the objective measurement section. For example, the optotype light beam projected from the subjective measurement optical system 25 is projected onto the eye E to be examined 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 examined 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, the reflected light of the measurement light 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. listed in, but not limited to. For example, the measurement light reflected by the objective measurement optical system 10 may be configured not to pass through the concave mirror 85.

More specifically, for example, in this embodiment, the optical axis between the concave mirror 85 and the eye E in the subjective measuring section and the optical axis between the concave mirror 85 and the eye E in the objective measuring section The optical axis and the optical axis are 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 by the dichroic mirror 35 and become coaxial.

<Light path of subjective measurement unit>
The optical path of the subjective measurement unit will be explained below. For example, the subjective measurement unit guides the optotype light flux that has passed through the corrective optical system 60 to the eye E by reflecting it in the direction of the eye to be examined by the concave mirror 85, and the light flux that has passed through the corrective optical system 60. An image of the optotype light beam is optically formed in front of the eye E to be examined at a predetermined examination distance. For example, at this time, the optotype light flux that has passed through the correction optical system 60 passes through an optical path deviating from the optical axis L of the concave mirror 85 and enters the concave mirror 85; The light is reflected and guided to the eye E to be examined. For example, the optotype seen by the subject appears to be farther away than the actual distance from the eye E to the display 31. That is, by using the concave mirror 85, the presentation distance of the optotype with respect to the eye E to be examined is extended, and the optotype can be presented to the examinee so that the image of the optotype light beam can be seen at a position at a predetermined examination distance. can.

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

As a result, an optotype corrected by the corrective optical system 60 is formed on the fundus of the left eye EL, with the eyeglass wearing position of the left eye EL (for example, about 12 mm from the corneal apex position) as a reference. Therefore, the astigmatism correcting optical system 63 was arranged as if in front of the eye, and the adjustment of the spherical power by the spherical power correcting optical system (in this embodiment, the drive of the drive mechanism 39) was performed in front of the eye. are equivalent, and the subject can collimate the image of the optotype in a natural state via the concave mirror 85. In this example, the optical path for the right eye has the same configuration as the optical path for the left eye, and the eyeglass wearing position of the left eye EL and right eye ER (for example, about 12 mm from the corneal apex position) is used as a reference. , optotypes corrected by a pair of left and right correction optical systems 60 are formed on the fundus of both eyes to be examined. In this way, the subject responds to the examiner while looking directly at the optotype in a state of natural vision, performs correction using the corrective optical system 60 until the optotype appears properly, and then uses the corrected value to make a conscious decision. The optical characteristics of the eye to be examined are measured.

<Optical path of objective measurement unit>
Next, the optical path of the objective measuring section will be explained. In the following description, the left eye optical path will be described as an example, but the right eye optical path also has the same configuration as the left eye optical path. For example, in the objective measurement unit 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 is transmitted to the correction optical system 90 via the relay lens 12 to the objective lens 14. incident on . The measurement light that has passed through the correction optical system 90 is projected from the left eye measurement section 7L toward the left eye deflection mirror 81L. The measurement light emitted from the left eye measurement section 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, reaches the left eye EL, and forms a spot-like point light source image on the fundus of the left eye EL. At this time, the pupil projection image (the projected light flux on the pupil) of the hole portion of the hall mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis.

The light of the point light source image formed on the fundus of the left eye EL is reflected and scattered, exits the eye E, is condensed by the objective lens 14 via the optical path through which the measurement light passes, and is focused by the dichroic mirror 29. , dichroic mirror 35, prism 15, hall mirror 13, relay lens 16, and mirror 17. The reflected light that has passed through the mirror 17 is again focused on the aperture of the light-receiving diaphragm 18, turned into a substantially parallel beam by the collimator lens 19 (in the case of emmetropic eyes), and taken out as a ring-shaped beam by the ring lens 20. The light is received by the image sensor 22 as a ring image. By analyzing the received ring image, the optical characteristics of the eye E can be measured objectively.

<Control unit>
FIG. 6 is a diagram showing a control system of the optometry apparatus 1 according to this embodiment. For example, various components such as the monitor 4, the nonvolatile memory 75 (hereinafter referred to as the memory 75), the light source 11 included in the measurement unit 7, the image sensor 22, the display 31, and the image sensor 52 are electrically connected to the control unit 70. ing. Further, for example, drive units (not shown) including the drive unit 9, drive mechanism 39, rotation mechanisms 62a and 62b, drive unit 83, and rotation mechanisms 92a and 92b, respectively, are electrically connected to the control unit 70.

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

For example, the memory 75 is a non-transitory storage medium that can retain stored contents even if the power supply is cut off. For example, as the memory 75, a hard disk drive, flash ROM, USB memory, etc. can be used. For example, the memory 75 stores a control program for controlling the subjective measurement section and the objective measurement section.

<Control operation>
The control operation of the optometry device 1 will be explained.

<Detection of pupil conjugate position with respect to the eye to be examined and alignment of the measurement unit>
The examiner instructs the subject to place his or her chin on the chinrest 5 and observe the presentation window 3. The examiner also operates the monitor 4 to select a fixation target for fixating the eye E to be examined. The control unit 70 displays a fixation target on the display 31 according to the input signal from the monitor 4. As a result, a fixation target is projected onto the eye E to be examined.

Subsequently, the examiner operates the monitor 4 and selects a switch to start alignment between the eye E and the measurement unit 7 . The control unit 70 projects alignment index images by the first index projection optical system 45 and the second index projection optical system 46 onto the cornea of the eye E to be examined, in accordance with the input signal from the monitor 4 . Further, the control unit 70 uses the alignment index image to detect deviations of the corneal apex position Ek in the eye E from the alignment reference position in the X direction, Y direction, and Z direction (working distance direction). In this embodiment, such a deviation of the subject's eye is detected using an alignment index image, but it may be configured to be detected using a light receiving position of an electric signal or the like.

Further, the control section 70 moves the measuring section 7 based on the deviation. For example, in this embodiment, the concave mirror 85 may be fixedly arranged in the optical path of the light projecting optical system 30, and only the measuring section 7 may be moved based on the shift. Further, for example, in this embodiment, the concave mirror 85 may be movably arranged in the optical path of the light projecting optical system 30, and the measuring section 7 and the concave mirror 85 may be moved integrally based on the deviation.

As a result, the eye E to be examined is placed at an appropriate working distance, and alignment is completed. For example, the appropriate working distance in this embodiment is the distance from the eye E to the presentation window 3, and is the distance where the pupil position Ep of the eye E to be examined and the pupil conjugate position R1 match (details will be described later). do).

FIG. 7 is a diagram illustrating the pupil conjugate position in the measurement unit 7. FIG. 7A shows a state in which alignment of the eye E to be examined has been completed and the eye E to be examined is at an appropriate working distance with respect to the measurement unit 7. FIG. 7B shows a state in which the eye E to be examined has moved from the state shown in FIG. FIG. 7(c) shows a state in which the eye E to be examined is at an appropriate working distance with respect to the measuring section 7 by moving the measuring section 7 from the state shown in FIG. 7(b). In addition, in FIG. 7, for convenience, the subject's eye E, the presentation window 3, the concave mirror 85 (here, explained by replacing it with a convex lens), and the measuring section 7 are arranged on a straight line for simplicity. Further, in FIG. 7, when the eye E to be examined is located at a predetermined position Z1, the position of the measuring section 7 where the pupil conjugate position R1 coincides with the pupil position Ep is defined as the initial position T1 of the measuring section 7.

For example, as shown in FIG. 7(a), if the eye to be examined E is at an appropriate working distance g1 with respect to the measurement unit 7 at the initial position T1, the pupil position Ep of the eye to be examined and The pupil position R1 at the working distance g1 coincides with the pupil position R1. Further, if the eye E to be examined is at an appropriate working distance g1 with respect to the measurement unit 7 located at the initial position T1, the pupil position Ep and the pupil conjugate position R2 inside the optometry device 1 have a predetermined positional relationship. Become. As an example, the distance from the pupil position Ep to the concave mirror 85 and the distance from the concave mirror 85 to the pupil conjugate position R2 are both the same (substantially the same) distance WD. Therefore, if the eye E to be examined is at an appropriate working distance g1 with respect to the measurement unit 7 at the initial position T1, the pupil position Ep (pupil position R1) and the pupil conjugate position R2 are Optically conjugated.

However, for example, as shown in FIG. 7(b), if the eye E to be examined moves after the alignment is completed, the eye E to be examined is not at the appropriate working distance g1 with respect to the measurement unit 7 at the initial position T1, and the pupil The position Ep may be shifted from the pupil position R1 in the Z direction. For example, in such a case, the control unit 70 fixes the concave mirror 85 in the optical path of the light projecting optical system 30 and moves only the measurement unit 7 based on the displacement of the eye E to be examined. More specifically, the control unit 70 controls the concave surface so that the imaging point R3 (pupil imaging position R3) on the concave mirror 85 when the pupil position Ep is taken as an object point matches the pupil conjugate position R2. The measurement unit 7 is moved in the Z direction with respect to the mirror 85 to adjust the alignment.

For example, the control unit 70 detects the corneal vertex position Ek of the eye E to be examined using the alignment index image, and detects the pupil position Ep based on the corneal vertex position Ek. Since it is assumed that the pupil position Ep is located a predetermined distance (for example, 3 mm) on the back side from the corneal apex position Ek, the pupil position Ep can be detected by detecting the corneal apex position Ek. Further, the control unit 70 detects the distance G (working distance G) from the pupil position Ep to the presentation window 3 using the alignment index image, and determines the distance G and the appropriate working distance g1 at the initial position T1 of the measuring unit 7. The amount of movement δzp by which the measurement unit 7 is moved is calculated based on the amount of deviation δz (in other words, the amount of deviation δz of the pupil position Ep from the pupil position R1).

For example, the movement amount δzp of the measurement unit 7 is determined by the focal length f of the concave mirror 85, the distance from the pupil position Ep to the concave mirror 85 (i.e., WD+δz), and the distance from the concave mirror 85 to the pupil imaging position R3 (i.e. , WD-δzp) using the following formula.

The control unit 70 moves the measurement unit 7 integrally with respect to the concave mirror 85 in the optical axis L4 direction based on the movement amount δzp. As a result, as shown in FIG. 7(c), the measurement unit 7 moves from the initial position T1 to the movement position T2, and the pupil conjugate position R2 coincides with the pupil imaging position R3. By the control unit 70 moving the measurement unit 7, the conjugate relationship between the pupil position Ep of the eye E to be examined and the pupil conjugate position R2 is maintained, and the alignment of the measurement unit 7 with respect to the eye E to be examined is completed.

<Start of subjective measurement>
When the examiner completes the alignment of the eye E to be examined and the measurement unit 7, the examiner starts subjective measurement of the eye to be examined. The examiner operates the monitor 4 to set a correction power in order to correct the eye refractive power of the eye E to be examined to a predetermined value (for example, 0D, etc.). The examiner obtains in advance the optical characteristics of the eye E to be examined (for example, the optical characteristics in the objective measurement of the eye E, the optical characteristics in the subjective measurement of the eye E, etc.), and performs correction based on this. You may also set the frequency.

<Change in optotype luminous flux due to misalignment>
After the alignment between the eye E and the measuring unit 7 is completed, when the measuring unit 7 moves by the amount of movement δzp in accordance with the amount of deviation δz of the eye E to be examined, the degree of refraction of the eye E is set to a predetermined value. It may not be possible to correct it. In other words, depending on the amount of deviation δz of the eye E in the Z direction (in other words, the amount of movement δzp of the measurement unit 7 in the Z direction), it is not possible to add the desired correction power to the eye E, and the refractive power of the eye E cannot be adjusted. may be corrected with another value different from the predetermined value. Such a phenomenon is caused by moving the measurement unit 7 with respect to the eye E to be examined, so that the measurement unit 7 is moved relative to the concave mirror 85 fixedly arranged in the optical path of the projection optical system 30, and the measurement unit 7 is moved relative to the eye E to be examined. This occurs because the divergence/convergence angle of the optotype light flux incident on the target light flux (that is, the divergence/convergence state of the optotype light flux) changes. Hereinafter, changes in the divergence and convergence angle of the optotype light flux will be explained.

FIG. 8 is a diagram illustrating changes in the divergence and convergence angle of the optotype light flux. FIG. 8A shows a state in which alignment for the eye E to be examined has been completed and the eye E to be examined is at position Z1. FIG. 8B shows a state in which the eye E to be examined has moved from the state shown in FIG. FIG. 8C shows a state in which the eye E to be examined has moved from the state shown in FIG. In FIG. 8, for convenience, the eye E, the concave mirror 85 (explained by replacing it with a convex lens), and the measuring section 7 are arranged on a straight line, and the objective lens 14 and the light projection lens 33 included in the measuring section 7 are arranged in a straight line. , and the light projecting lens 34 are replaced with one convex lens M for simplification. Moreover, in FIG. 8, a case where the eye E to be examined is an emmetropic eye (the eye refractive power is 0D) is taken as an example.

For example, as shown in FIG. 8A, when the eye E to be examined is at position Z1, the measurement unit 7 is placed at the initial position T1 due to alignment. At this time, the optotype light flux emitted from the display 31 is refracted by the convex lens M, passes through the fundus conjugate position Q2 inside the optometric apparatus 1, and is refracted by the concave mirror 85. The optotype light flux passing through the concave mirror 85 becomes parallel light (that is, at an angle of 0 degrees) and enters the eye E to be examined, and is condensed at a fundus conjugate position Q1 located outside the optometry apparatus 1. In this case, the fundus conjugate position Q1 matches the fundus Ef of the eye E to be examined. For example, in such a state, the position of the optical test target (that is, the position of the optical display 31) presented to the eye E to be examined is located at infinity in front of the eye E to be examined. A desired correction power (for example, 0D here because the eye E to be examined is an emmetropic eye) can be added.

On the other hand, for example, as shown in FIG. 8(b), when the eye E to be examined approaches the concave mirror 85 side by a deviation amount δz1 from the position Z1, the measurement unit 7 moves by a movement amount δzp1 from the initial position T1. do. Along with this, the fundus conjugate position Q2 and the pupil conjugate position R2 move in a direction away from the concave mirror 85. The optotype light flux emitted from the display 31 is refracted by the convex lens M, passes through the moved fundus conjugate position Q2, and is refracted by the concave mirror 85. The optotype light flux passing through the concave mirror 85 becomes not parallel light but convergent light (that is, at a convergence angle θ1) and enters the eye E to be examined, and is condensed at the fundus conjugate position Q1. In this case, the eye E (measuring unit 7) moves and changes from the state shown in FIG. 8(a) to the state shown in FIG. A fundus conjugate position Q1 is placed on the side. In such a state, the position of the optical test target presented to the eye E is placed in front of the infinity of the eye E, which is different from the desired correction power for the eye E. Frequency will be added.

Similarly, for example, as shown in FIG. 8C, when the eye E to be examined is moved away from the position Z1 by a shift amount δz2 from the concave mirror 85 side, the measurement unit 7 moves by a movement amount δzp2 from the initial position T1. Along with this, the fundus conjugate position Q2 and the pupil conjugate position R2 move in a direction closer to the concave mirror 85. The optotype light flux emitted from the display 31 is refracted by the convex lens M, passes through the moved fundus conjugate position Q2, and is refracted by the concave mirror 85. The optotype light flux passing through the concave mirror 85 becomes not parallel light but divergent light (that is, at a divergence angle θ2) and enters the eye E to be examined, and is condensed at the fundus conjugate position Q1. In this case, the eye E (measuring unit 7) moves and changes from the state shown in FIG. 8(a) to FIG. A fundus conjugate position Q1 is placed on the side. In such a state, the position of the optical test target presented to the eye E is placed behind the eye E, so a power different from the desired correction power is added to the eye E. Become so.

For example, as described above, when the convergence-divergence angle of the optotype light flux incident on the eye E (i.e., the convergence angle of the optotype light flux, the divergence angle of the optotype light flux, etc.) changes, the image presented to the eye E The position of the optical test target changes. Therefore, a power different from the desired correction power is added to the eye E to be examined. Note that the angle of convergence and divergence of such a target light flux changes more greatly as the absolute value of the ocular refractive power of the eye E to be examined is larger (in other words, the greater the absolute value of the correction power added to the eye E to be examined is). Become. Further, the angle of convergence and divergence of such a target light flux changes more as the refractive power of the concave mirror 85 fixedly disposed in the optical path of the projection optical system 30 increases.

<Correction of optotype luminous flux>
Therefore, in this embodiment, the angle of convergence and divergence of the optotype light flux, which changes depending on the alignment between the eye E to be examined and the measuring section 7, is made to be a constant angle before and after the eye E to be examined (the measuring section 7) moves. First, the optical characteristics of the optotype light beam are corrected. In other words, the convergence/divergence state of the target light flux (convergent light flux, parallel light flux, or diverging light flux), which changes depending on the alignment between the eye E and the measurement unit 7, is maintained before and after the eye E is moved. First, the optical characteristics of the optotype light beam are corrected. Thereby, a desired correction power can be added to the eye E to be examined.

FIG. 9 is a diagram illustrating correction of the optotype light flux. FIG. 9A shows a state in which the eye E to be examined is at position Z1, the measurement unit 7 is at the initial position T1, and parallel light is incident on the eye E to be examined (same state as in FIG. 8A). FIG. 9(b) shows a state in which the eye E to be examined is shifted from the position Z1 and the measurement unit 7 is shifted from the initial position T1, and diverging light is incident on the eye E to be examined (same state as in FIG. 8(c)). FIG. 9C shows a state in which the optotype light flux is corrected from the state shown in FIG. 9B, and parallel light is incident on the eye E to be examined. In FIG. 9 as well, the eye E to be examined is an emmetropic eye, and here, in order to add a predetermined spherical power to the eye E to be examined, a case will be exemplified in which the spherical refractive power of the optotype light beam is corrected.

In this embodiment, since the eye E to be examined is an emmetropic eye, the spherical power S1 for correcting the eye E to be examined (the spherical power S1 added to the eye E to be examined) may be set to 0D. The control unit 70 controls each optical system in the measurement unit 7 according to the spherical power S1 set by the examiner, and adjusts the spherical refractive power of the optotype light flux emitted from the measurement unit 7 to 0D. For example, the control unit 70 moves the display 31 in the direction of the optical axis L2 according to the spherical power S1 set by the examiner, and places the display 31 at a position N1 corresponding to the spherical power S1 (here, 0D). . As a result, the spherical refractive power of the optotype light flux emitted from inside the measurement unit 7 is adjusted to 0D.

At this time, in the state of FIG. 9A in which there is no deviation in the Z direction in the eye E, the optotype light flux emitted from within the measurement unit 7 enters the eye E as parallel light and is condensed at the fundus Ef. Therefore, the eye E to be examined is corrected to 0D according to the set spherical power S1. However, in the state shown in FIG. 9(b) in which the eye E to be examined is shifted by the amount of deviation δz in the Z direction, the optotype light flux emitted from inside the measurement unit 7 enters the eye E as a diverging light, and the eye is located deeper than the fundus Ef. Focus the light on the side. Therefore, even if the display 31 is placed at the position N1 corresponding to the spherical power S1, a value different from the spherical power S1 is added to the eye E to be examined. For example, the eye E to be examined is corrected not by 0D but by +1D.

Therefore, when the state shown in FIG. 9(b) is reached, the control unit 70 adjusts the spherical refractive power of the target light flux emitted from the measurement unit 7 to a predetermined spherical refractive power S2 (hereinafter referred to as corrected spherical refractive power S2). By adjusting the target eye E, the optotype light flux incident on the eye E is made into parallel light similar to that shown in FIG. 9(a), resulting in the state shown in FIG. 9(c).

For example, in the present example, the corrected spherical refractive power S2 is a function of the spherical power S1 added to the eye E to be examined and the amount of deviation δz of the eye E to be examined in the Z direction (for example, S2=S2(S1, δz) ) can be expressed as The control unit 70 moves the eye E in the Z direction so that when the eye E shifts from the state shown in FIG. 9(a) to the state shown in FIG. 9(b), such a function is established. The spherical refractive power (corrected spherical refractive power S2) of the optotype light beam is calculated so as to replace the state with no deviation (deviation amount δz=0) and add the desired spherical power S1 to the eye E to be examined.

The control unit 70 controls each optical system in the measuring unit 7 based on the corrected spherical refractive power S2, and adjusts the spherical refractive power of the optotype light flux emitted from the measuring unit 7 to the corrected spherical refractive power S2. do. For example, the control unit 70 places the display 31 at a position N2 corresponding to the corrected spherical refractive power S2. As a result, the fundus conjugate position Q1 and the fundus conjugate position Q2 move toward the optical axis L4 while maintaining the conjugate relationship between the pupil position Ep of the eye E and the pupil conjugate position R2, and the fundus Ef of the eye E to be examined moves toward the optical axis L4. , the fundus conjugate position Q1 and the fundus conjugate position Q2 have a conjugate relationship.

At this time, the optotype light flux emitted from the display 31 is refracted by the convex lens M, passes through the fundus conjugate position Q2, and is refracted by the concave mirror 85, so that it enters the eye E as parallel light and enters the fundus. The light is focused at Ef (fundus conjugate position Q1). As a result, the spherical refractive power of the optotype light flux emitted from inside the measurement unit 7 is set to a value different from 0D (here, corrected spherical refractive power S2), but the optotype light flux is corrected and E is now corrected by the spherical power S1 (0D). That is, in this embodiment, by using Equation 2, a constant spherical power (here, spherical power S1) can be given to the eye E to be examined.

For example, in this embodiment, when the optotype light flux is corrected in this way, the control unit 70 causes the spherical power of the eye E to be actually corrected to be displayed as the measurement result displayed on the monitor 4. Good too. More specifically, by guiding the optotype light beam having the corrected spherical refractive power S2 toward the eye E rather than the spherical power set in the measurement unit 7, the target light beam actually enters the eye E to be examined. The spherical power of the optotype light beam may be displayed. As a result, the spherical power actually added to the eye E is output, taking into account that the optotype light beam incident on the eye E has been corrected, so the examiner can accurately determine the optical characteristics of the eye E. can be obtained.

Note that in the above example, the correction of the divergence and convergence angle of the optotype light beam in the case where the eye E to be examined is displaced in the direction away from the concave mirror 85 and the diverging light is incident on the eye E to be examined is taken as an example. The correction of the divergence and convergence angle of the optotype light beam in the case where the convergent light is incident on the eye E after being shifted toward the concave mirror 85 can be considered in the same way.

Furthermore, in the above example, the case where the desired spherical power S1 is added to the eye E to be examined, but the same correction can be made using equation 2 also when adding the desired cylindrical power to the eye E to be examined. I can do it. For example, in this case, the control unit 70 may correct the divergence and convergence angle of the optotype light beam by rotating the cylindrical lenses 61a and 61b around the optical axis L2 based on the corrected cylindrical power obtained from Equation 2. good.

As explained above, for example, the optometry apparatus in this embodiment has a fixed optical member that changes when the measurement unit is moved to maintain the conjugate relationship between the eye to be examined and the pupil conjugate position. The change in the divergence and convergence angle of the measurement light beam based on the distance between the measurement unit and the measurement unit is corrected. As a result, the divergence and convergence angle of the measurement light beam is maintained before and after the measurement unit is moved relative to the eye to be examined, so that the appropriate measurement light beam can be incident on the eye to be examined and the optical characteristics of the eye to be examined can be accurately obtained. be able to.

Further, for example, the optometry apparatus in this embodiment acquires the optical characteristics of the eye to be examined, and performs measurement based on the optical characteristics of the eye to be examined and the position information of the pupil conjugate position of the eye to be examined and the pupil conjugate position in the light projection optical system. Corrects changes in the divergence and convergence angle of the luminous flux. As a result, it is possible to easily correct changes in the divergence and convergence angle of the measurement light beam, which vary in degree depending on the optical characteristics of the eye to be examined, and to accurately acquire the optical characteristics of the eye to be examined.

For example, the optometry apparatus in this embodiment includes a light projection optical system that projects a measurement light beam toward the subject's eye, and a light projection optical system that changes the optical characteristics of the measurement light beam in the optical path of the light projection optical system. and a correction optical system, and by controlling the correction optical system, the optical characteristics of the measurement light beam are corrected. Thereby, there is no need to provide a new member, the divergence and convergence angle of the measurement light beam can be corrected with a simple configuration, and the optical characteristics of the eye to be examined can be acquired with high accuracy.

Further, for example, in the optometry apparatus of this embodiment, a concave mirror is used as a fixed optical member fixedly disposed in the optical path of the projection optical system, and the measurement light beam reflected by the concave mirror is guided to the eye to be examined. As a result, the optotype presented to the eye to be examined is optically placed at a predetermined examination distance. Since the predetermined members do not have to be arranged at actual distances, the device can save space.

<Transformation example>
In this embodiment, the divergence and convergence angle of the target light flux, which changes as the eye E (measuring unit 7) shifts in the Z direction, is maintained before and after the eye E (measuring unit 7) moves. Although the explanation has been given using an example of a configuration in which the correction is made based on the above, the present invention is not limited to this. For example, when the eye E to be examined shifts in the Z direction, the area where the optotype light beam is incident on the concave mirror 85 changes, and aberrations due to the concave mirror 85 may occur. Therefore, in this embodiment, the optotype light flux may be corrected by taking into account the divergence/convergence angle of the optotype light flux and the aberration caused by the concave mirror 85, respectively.

In addition, in this embodiment, in order to correct the spherical refractive power of the optotype light flux and make the optotype light flux emitted from inside the measurement unit 7 have the corrected spherical refractive power S2, the arrangement position of the display 31 is changed as an example. Although the description has been given above, the invention is not limited thereto. For example, in order to make the optotype light flux emitted from inside the measuring section 7 the corrected spherical refractive power S2, an optical member may be separately inserted and removed. Similarly, for example, in order to correct the cylindrical refractive power of the optotype light flux and make the optotype light flux emitted from within the measuring section 7 have the corrected cylindrical refractive power, an optical member may be separately inserted and removed.

These optical members used for correcting the spherical refractive power and the cylindrical refractive power are located on the optical axis (for example, on the optical axis L2 or on the optical axis L3) through which the optotype light flux emitted from the display 31 toward the eye E passes. If so, it may be inserted or removed at any position. As the optical member, a lens (for example, a spherical lens, a cylindrical lens, etc.), a prism, a mirror, etc. can be used.

In addition, in this embodiment, in order to correct the spherical refractive power of the optotype light beam, a configuration using the formula shown in Equation 2 has been described as an example, but the present invention is not limited to this. For example, in order to correct the spherical refractive power of the optotype light flux, a correction table is created in which the corrected spherical refractive power S2 based on the deviation amount δz of the eye E to be examined and the correction power S1 added to the eye E to be examined are associated in advance. The configuration may be such that the information is stored in the memory 75. In this case, the control unit 70 obtains the spherical refractive power S2 from the deviation amount δz and the spherical power S1, and controls the placement position of the display 31 according to the spherical refractive power S2, thereby controlling the spherical refractive power of the optotype light beam. It may be corrected.

In addition, in this embodiment, when the eye E to be examined is shifted from the position Z1 in the Z direction, the configuration is described as an example in which the divergence and convergence angle of the optotype light beam incident on the eye E to be examined is corrected, but the present invention is not limited to this. Not done. For example, depending on the amount of deviation δz of the eye E to be examined, the change in the divergence and convergence angle of the optotype light flux is slight, so there is a case where the optotype light flux does not need to be corrected. When adopting such a configuration, it is possible to correct the optotype light flux by setting a tolerance range for the displacement amount δz of the eye E and detecting whether the displacement amount δz exceeds the tolerance range. It may be determined whether or not. The allowable range may be set in advance for each eye refractive power of the eye E to be examined through experiments, simulations, etc.

In the present embodiment, a configuration for correcting the divergence and convergence angle of the optotype light beam in subjective measurement of the subject's eye has been described as an example, but the present invention is not limited to this. For example, such correction may be performed in objective measurement of the eye to be examined. In the objective measurement, a measurement light beam is irradiated from the light source 11 toward the fundus Ef of the eye E to be examined, and the fundus reflected light beam reflected from the fundus is captured as a ring image by the image sensor 22. At this time, due to the alignment between the eye E and the measurement unit 7, when the measurement unit 7 moves by a movement amount δzp according to the amount of deviation δz of the eye E in the Z direction, the divergence and convergence angle of the fundus reflected light flux changes, The shape and size of the ring image based on the fundus reflected light flux may change.

Therefore, the control unit 70 controls the movement position of the drive unit 95 in the direction of the optical axis L2, the rotation angle of the cylindrical lenses 91a and 91b, etc. using the amount of deviation δz of the eye E in the Z direction. , the same fundus-reflected light flux as in a state where there is no shift in the Z direction may be made to enter the eye E to be examined. As a result, the divergence and convergence angle of the fundus reflected light flux is maintained before and after the measurement unit 7 is moved, and a correct ring image based on the fundus reflected light flux can be obtained. The control unit 70 analyzes the ring image to obtain the eye refractive power in each meridian direction, and performs predetermined processing on this eye refractive power to obtain the objective value of the eye E (i.e., the eye E optical properties in objective measurements) can be acquired with high precision.

Of course, the control unit 70 does not control the movement position of the drive unit 95 or the rotation angle of the cylindrical lenses 91a and 91b as described above, but rather controls the ring image in advance based on the ring image that has changed due to the alignment between the eye E and the measurement unit 7. By determining the objective value in advance and correcting this objective value using the amount of deviation δz of the eye E in the Z direction, it is also possible to obtain highly accurate measurement results.

1 Subjective optometry device 2 Housing 4 Monitor 5 Chin rest 7 Measuring unit 10 Objective measurement optical system 25 Subjective measurement optical system 30 Light projecting optical system 45 First target projection optical system 46 Second target projection optical system 50 Observation optics System 60 Correction optical system 70 Control unit 75 Memory 81 Deflection mirror 84 Half mirror 85 Concave mirror 90 Correction optical system 100 Anterior segment imaging optical system

Claims (4)

A measurement means having at least a projection optical system that projects a measurement light beam toward the eye to be examined;
a fixed optical member fixedly arranged in the optical path of the light projecting optical system, the fixed optical member guiding the measurement light flux from the light projecting optical system;
Equipped with
An optometry device that measures optical characteristics of the eye to be examined by projecting the measurement light beam onto the eye to be examined,
acquisition means for acquiring the eye refractive power of the eye to be examined or a correction power set for correcting the eye refractive power of the eye to be examined by a correction means;
a detection means for detecting positional relationship information between the eye to be examined and a pupil conjugate position in the light projection optical system;
Based on the positional relationship information detected by the detection means, a driving means is controlled to move the measuring means with respect to the eye to be examined so as to maintain a conjugate relationship between the eye to be examined and the pupil conjugate position. a movement control means for causing
a correction means for correcting a change in the divergence and convergence angle of the measuring light beam due to a distance between the fixed optical member and the measuring means, which changes due to the movement of the measuring means by the movement control means;
Equipped with
The correction means calculates a change in the divergence and convergence angle of the measurement light beam based on the eye refractive power or the corrected power acquired by the acquisition means and the positional relationship information detected by the detection means. An optometry device characterized by correction . The optometry device according to claim 1,
The optometry apparatus is characterized in that the correction means corrects the divergence and convergence angle of the measuring light beam so that it is maintained before and after the measurement means moves. The optometry device according to claim 1 or 2,
The measuring means is a subjective measuring means having the light projection optical system and a correction optical system that is located in the optical path of the light projection optical system and changes the optical characteristics of the measurement light beam,
The optometry apparatus is characterized in that the correction means corrects a change in the divergence and convergence angle of the measurement light beam by controlling the correction optical system. A measurement means having at least a projection optical system that projects a measurement light beam toward the eye to be examined;
a fixed optical member fixedly arranged in the optical path of the light projecting optical system, the fixed optical member guiding the measurement light flux from the light projecting optical system;
Equipped with
An optometry program used in an optometry device that measures optical characteristics of the eye to be examined,
being executed by a processor of the optometry device,
an acquisition step of acquiring the eye refractive power of the eye to be examined or a correction power set for correcting the eye refractive power of the eye to be examined by a correction means;
a detection step of detecting positional relationship information between the eye to be examined and a pupil conjugate position in the light projection optical system;
Based on the positional relationship information detected in the detection step , controlling a driving means to move the measuring means with respect to the eye to be examined so as to maintain a conjugate relationship between the eye to be examined and the pupil conjugate position. a movement control step for causing
a correction step of correcting a change in the divergence and convergence angle of the measurement light beam due to the distance between the fixed optical member and the measurement means, which changes due to the movement of the measurement means in the movement control step;
causing the optometry device to execute
The correction step calculates a change in the divergence/convergence angle of the measurement light beam based on the eye refractive power or the correction power obtained in the acquisition step and the positional relationship information detected in the detection step. An optometry program that features correction .