JP7101578B2 - Ophthalmic device and its operation method - Google Patents

Description

The present invention relates to an ophthalmic apparatus for objectively measuring (examining) the eye characteristics of an eye to be inspected and a method for operating the ophthalmic apparatus.

Ophthalmic devices (refractometer, autorefkeratometer, etc.) that objectively measure the optical power (spherical power, cylindrical power, astigmatic axis angle, etc.) as the eye characteristics of the eye to be inspected are well known (Patent Documents). See 1-3). In such an ophthalmic apparatus, after performing automatic alignment to focus the optical system on the eye to be inspected, a ring-shaped measurement pattern is projected on the fundus of the eye to be inspected, and the measurement pattern reflected by the fundus is projected. The fundus reflected light is imaged. Then, the ophthalmologist analyzes the captured image of the reflected light from the fundus of the eye, detects a ring image corresponding to the measurement pattern from the captured image, and obtains an approximate ellipse that approximates the ring image, and the shape of the approximate ellipse. The optical power of the eye to be inspected is calculated based on (major axis, minor axis, and axial angle).

Japanese Unexamined Patent Publication No. 2017-63979 Japanese Unexamined Patent Publication No. 2018-38881 Japanese Unexamined Patent Publication No. 2016-159071

FIG. 14 is an explanatory diagram showing an example of an image captured image 23 obtained by imaging the fundus reflected light of the measurement pattern reflected by the fundus of the eye to be inspected. As shown in FIG. 14, in the ophthalmic apparatus, the ring image 24 in the captured image 23 is used for calculating the optical refractive power in the ophthalmologic apparatus by focusing the optical system on the fundus of the eye to be inspected (normal eye) by automatic alignment. It will be of suitable size, i.e., the ring image 24 will be within the range of the scale 100 predetermined by the ophthalmologic device. As a result, the refractive power of the eye to be inspected can be accurately obtained from the ring image 24. Therefore, in the ophthalmic apparatus, it is desirable to adjust the focus of the optical system of the ophthalmic apparatus so that the ring image 24 is within the range of the scale 100, more preferably within the scale 100a inside the scale 100. ..

However, when a disease such as refractive error (astigmatism, etc.) or cataract occurs in the eye to be inspected, the optical system does not focus on the fundus of the inspected eye even if automatic alignment is performed by an ophthalmic apparatus, and the inside of the scale 100 is inside. The ring image 24 may not fit, or the ring image 24 may become undetectable from the captured image 23. In this case, it may not be possible to measure the eye characteristics of the eye to be inspected.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an ophthalmic apparatus capable of measuring eye characteristics of an eye to be inspected with a disease and a method of operating the same.

The ophthalmologic apparatus for achieving the object of the present invention is an optotype projection optical system having a first optical axis and projecting an optotype light beam onto the fundus of the eye to be inspected, and emits the optotype light beam. The optotype has a first light emitting unit and a first lens through which the optotype of the optotype is transmitted, and one of the first light emitting unit and the first lens is freely arranged along the first optical axis. A measurement pattern projection optical system having a projection optical system and a second optical axis and projecting a light beam of a measurement pattern onto the fundus of the eye, and a second light beam emitting unit that emits a light beam of the measurement pattern is a second. The measurement pattern projection optical system that is freely arranged along the optical axis and the fundus reflected light of the light beam of the measurement pattern projected from the measurement pattern projection optical system to the fundus, which has a third optical axis. A light-receiving optical system that receives light and has a second lens that is freely arranged along the third optical axis, and one movement along the first optical axis, along the second optical axis. The interlocking movement mechanism that interlocks the movement of the second light beam emitting part and the movement of the second lens along the third optical axis and the ring image based on the fundus reflected light received by the light receiving optical system are analyzed. An eye characteristic calculation unit that calculates the eye characteristics of the eye to be inspected, a movement control unit that controls the interlocking movement mechanism and executes movement processing to move one of them along the first optical axis, and a movement control unit that performs movement processing. Controls the interlocking movement mechanism when the stop operation reception unit that accepts the stop operation that stops the movement process at the position where the subject's eye consciously recognizes the optotype during execution and the stop operation reception unit accepts the stop operation. Based on the stop control unit that stops the movement process and the stop position of one that is stopped on the first optical axis by the stop control unit, the focus position of one that focuses the light beam of the optotype on the fundus is determined. A positioning control unit that controls the in-focus position determination unit and the interlocking movement mechanism to position one at the in-focus position determined by the in-focus position determination unit, and a positioning control unit for measurement when one is moved to the in-focus position. Other than performing objective measurement including projection of the light beam of the measurement pattern onto the eye to be inspected by the pattern projection optical system, reception of the fundus reflected light by the light receiving optical system, and calculation of the eye characteristics by the eye characteristic calculation unit. It is equipped with an optical measurement control unit.

According to the present invention, since the second light flux emitting portion and the second lens can be positioned at the in-focus position with respect to the eye E estimated from the subjective examination, the measurement projected from the measurement pattern projection optical system to the fundus. The focus of the luminous flux of the pattern can be made to match (substantially match) the fundus Ef.

In the ophthalmic apparatus according to another aspect of the present invention, the first light flux emitting unit can selectively emit the luminous flux of a plurality of types of visual targets having different visual acuity values, and controls the first light flux emitting unit for visual acuity. The emission control unit that emits the luminous flux of the target in order according to the type of the optotype, and the movement control unit and the stop operation reception unit each time the luminous flux of the optotype corresponding to the new visual acuity value is emitted from the first luminous flux emission unit. , And a repetitive control unit that repeatedly operates the stop control unit, and the focusing position determining unit determines the focusing position based on the stop position for each type of optotype. This makes it possible to determine the in-focus position of the first lens even for the eye to be inspected having a disease.

In the ophthalmic apparatus according to another aspect of the present invention, the in-focus position determining unit determines the stop position corresponding to the optotype having the highest visual acuity value among the stop positions for each type of optotype as the in-focus position. .. This makes it possible to determine the in-focus position of the first lens even for the eye to be inspected having a disease.

In the ophthalmic apparatus according to another aspect of the present invention, the focusing position determination unit is estimated to be a stop position corresponding to a visual acuity value equal to or higher than a predetermined reference value based on a stop position for each type of optotype. The stop position is calculated and the estimated stop position is determined as the in-focus position. This makes it possible to determine the in-focus position of the first lens even for the eye to be inspected having a disease.

In the ophthalmic apparatus according to another aspect of the present invention, the focusing position determining unit generates correspondence information indicating the correspondence between the type of the optotype and the stop position, and calculates the estimated stop position based on the correspondence information. This makes it possible to determine the in-focus position of the first lens even for the eye to be inspected having a disease. In addition, the corresponding information can be used for a subjective test using a separate device.

In the ophthalmic apparatus according to another aspect of the present invention, the emission control unit controls the first light flux emission unit to emit the light flux of the optotype in order from the optotype having the lowest visual acuity value. As a result, the stop position of the first lens can be gradually brought closer to the side to be inspected.

In the ophthalmic apparatus according to another aspect of the present invention, the movement control unit controls the interlocking movement mechanism to move one of them along the traveling direction of the light flux of the optotype. This allows the eye to be inspected to recognize the optotype during the movement process of the first lens.

In the ophthalmic apparatus according to another aspect of the present invention, when the movement control unit controls the interlocking movement mechanism to execute the first movement process, one of them is along the traveling direction from the initial position where the eye to be inspected is fogged. When the interlocking movement mechanism is controlled to execute the second and subsequent movement processes, one of them is moved along the traveling direction from the previous stop position.

In the ophthalmic apparatus according to another aspect of the present invention, the second light flux emitting unit emits a light flux having a ring-shaped measurement pattern.

The ophthalmic apparatus according to another aspect of the present invention includes a pair of optotype projection optical systems corresponding to both eyes, a pair of measurement pattern projection optical systems, and a pair of light receiving optical systems.

In the ophthalmic apparatus according to another aspect of the present invention, the first optical axis, the second optical axis, and the third optical axis are parallel to each other.

The method of operating the ophthalmologic apparatus for achieving the object of the present invention is an optotype projection optical system having a first optical axis and projecting an optotype light beam onto the fundus of the eye to be inspected, and an optotype light beam. It has a first light beam emitting part for emitting light, and a first lens through which the light beam of the target is transmitted, and one of the first light emitting part and the first lens is arranged so as to be able to move forward and backward along the first optical axis. A second light beam emitting unit that has a target projection optical system and a second optical axis, is a measurement pattern projection optical system that projects the light beam of the measurement pattern onto the fundus, and emits the light beam of the measurement pattern. Has a measurement pattern projection optical system that is freely arranged along the second optical axis and a third optical axis, and the fundus of the light beam of the measurement pattern projected from the measurement pattern projection optical system onto the fundus. A light-receiving optical system that receives reflected light and has a second lens that is freely arranged along the third optical axis, and one movement along the first optical axis, the second light. Analysis of the interlocking movement mechanism that interlocks the movement of the second light beam emitting part along the axis and the movement of the second lens along the third optical axis, and the ring image based on the fundus reflected light received by the light receiving optical system. Then, in the operation method of the ophthalmologic device including the eye characteristic calculation unit for calculating the eye characteristics of the eye to be inspected, the movement control unit controls the interlocking movement mechanism to move one of them along the first optical axis. The movement control process for executing the movement process and the stop operation receiving unit accepting the stop operation for stopping the movement process at the position where the subject consciously recognizes the optotype while the movement control unit is executing the movement processing. The operation reception process, the stop control process in which the stop control unit controls the interlocking movement mechanism to stop the movement process when the stop operation reception unit receives the stop operation, and the focusing position determination unit control the stop. Based on the one stop position stopped on the first optical axis by the unit, the in-focus position determination step of determining the one in-focus position for focusing the light beam of the optotype on the fundus and the positioning control unit move in conjunction with each other. A measurement pattern when one of the positioning control process and the objective measurement control process, which controls the mechanism to position one at the in-focus position determined by the in-focus position determination unit, is moved to the in-focus position. Objective measurement that includes projection of the light beam of the measurement pattern onto the eye to be inspected by the projection optical system, light reception of the fundus reflected light by the light receiving optical system, and calculation of the eye characteristics by the eye characteristic calculation unit. It has an optical measurement control step.

INDUSTRIAL APPLICABILITY The present invention can measure the eye characteristics of an eye to be inspected with a disease.

It is a schematic diagram of the ophthalmic apparatus of this invention. It is a block diagram which shows the structure of the optical system of an ophthalmic apparatus. It is explanatory drawing for demonstrating an example of a plurality of types of optotype charts formed on a chart board. It is a functional block diagram of a control device. It is explanatory drawing for demonstrating the first movement processing, stop operation reception, and stop control by each part of the subjective inspection control part corresponding to the visual acuity value "0.1" visual acuity chart. It is explanatory drawing for demonstrating the second movement processing, stop operation reception, and stop control by each part of the subjective inspection control part corresponding to the visual acuity value "0.2". To explain the lens position of the in-focus lens after the fifth movement process, stop operation reception, and stop control by each part of the subjective inspection control unit corresponding to the visual acuity value "0.8" optotype chart. It is an explanatory diagram of. It is explanatory drawing for demonstrating the method of determining the focusing position of the focusing lens by the focusing position determination part. It is explanatory drawing which showed an example of the operation screen displayed on the monitor in the remeasurement mode. It is a flowchart which shows the flow of the objective measurement process of the ocular refractive power of the eye to be examined by the ophthalmology apparatus, especially the flow of the measurement process of the ocular refractive power in a remeasurement mode. It is explanatory drawing for demonstrating the captured image (ring image) acquired in the remeasurement mode. It is a schematic diagram of the ophthalmic apparatus of another Embodiment 1. FIG. It is a schematic diagram of the optotype projection optical system, the measurement pattern projection optical system, and the light receiving optical system of the ophthalmic apparatus of another embodiment 2. It is explanatory drawing which showed an example of the captured image obtained by imaging the fundus reflected light of the measurement pattern reflected by the fundus of an eye to be inspected.

[Configuration of ophthalmic appliances]
FIG. 1 is a schematic view of the ophthalmic apparatus 1 of the present invention. As shown in FIG. 1, the ophthalmic apparatus 1 is an autorefkeratometer or the like capable of measuring an optical power or the like as an eye characteristic of the eye E to be inspected, and includes a base 2, a face receiving portion 3, a gantry 4, and a measuring head. 5 and.

The X-axis direction in the figure is the left-right direction (the eye width direction of the subject E) with respect to the subject, the Y-axis direction is the vertical direction, and the Z-axis direction is the subject (the subject E). ) Is the front-back direction parallel to the front direction approaching and the rear direction away from the subject (also referred to as the working distance direction).

The face receiving portion 3 is provided integrally with the base 2 at a position on the front side of the measuring head 5 in the Z-axis direction. The face receiving portion 3 has a chin rest 3a and a forehead pad 3b whose positions can be adjusted in the Y-axis direction, and supports the face of the subject.

The gantry 4 is provided on the base 2 and can move in each direction (front-back, left-right direction) of the XZ axis with respect to the base 2. A measuring head 5 and an operating lever 6 are provided on the gantry 4.

The operation lever 6 is provided on the gantry 4 and at a position on the rear side (examiner side) of the measurement head 5 in the Z-axis direction, and is operated when the measurement head 5 is moved in each direction of the XYZ axes. It is an operating member. For example, when the operation lever 6 is tilted in the Z-axis direction (front-back direction) or the X-axis direction (left-right direction), the measurement head 5 is moved in the Z-axis direction or the X-axis direction by an electric drive mechanism (not shown). .. Further, when the operation lever 6 is rotated around its longitudinal axis, the measurement head 5 is moved in the Y-axis direction (vertical direction) by the above-mentioned electric drive mechanism according to the rotation operation direction. The top of the operating lever 6 is provided with a measurement button for starting the measurement of the optical refractive power of the eye to be inspected E by the ophthalmic apparatus 1.

The measuring head 5 has a function of measuring the eye characteristics (optical power and corneal shape) of the eye E to be inspected. A monitor 7 is provided on the surface of the measuring head 5 on the rear side in the Z-axis direction. Further, in the measurement head 5, an optical system 8 (including an image pickup element, various light sources, and various drive units) corresponding to the measurement of the refractive power of the eye and the like, and a control device 9 are provided.

The monitor 7 is, for example, a touch panel type liquid crystal display device. This monitor 7 is an observation image 22 (see FIG. 9) of the anterior eye portion of the eye E to be inspected used for alignment of the measurement head 5, and measurement results of the optical refractive power of the eye E to be inspected obtained by the measurement head 5. , And an input screen for performing operations (settings) related to measurement. Further, as shown in FIG. 9 described later, the monitor 7 displays an observation image 22 of the anterior eye portion, a captured image 23 (ring image 24), an operation screen 25 showing a measurement status, and the like in the remeasurement mode.

As the control device 9, various arithmetic processing devices are used to control the operation of each part of the ophthalmic apparatus 1 in an integrated manner and to calculate the refractive power of the eye to be inspected E and the like. For example, a spectacle lens measuring device (not shown) can be connected to the control device 9, and measurement data (lens power, etc.) of the spectacle lens worn by the subject is input from the spectacle lens measuring device.

[Optical system of ophthalmic appliances]
FIG. 2 is a block diagram showing the configuration of the optical system 8 of the ophthalmic apparatus 1. As shown in FIG. 2, the optical system 8 includes an observation optical system 12, a Z alignment optical system 13, an XY alignment optical system 14, an optotype projection optical system 15, a measurement pattern projection optical system 16, and light receiving. Includes an optical system 17.

(Structure of observation optical system)
The observation optical system 12 is an optical system used for observing the anterior eye portion of the eye E to be inspected, and photographs the anterior eye portion. The observation optical system 12 has a main optical axis O1 parallel to the Z-axis direction. The observation optical system 12 includes an objective lens 12a, a dichroic filter 12b, a half mirror 12c, a relay lens 12d, and a dichroic filter 12e in order from the side to be examined E along the main optical axis O1. A lens 12f and a CMOS (complementary metal oxide semiconductor) type or CCD (Charge Coupled Device) type image pickup element 12g are arranged. Further, the observation optical system 12 has an illumination light source (not shown). Since each part constituting the observation optical system 12 is a known technique, the details thereof will be omitted.

The illumination light emitted from the illumination light source of the observation optical system 12 illuminates the anterior segment of the eye E to be inspected and is reflected by the anterior segment. The reflected light is incident on the observation optical system 12, passes through each part of the observation optical system 12, and is incident on the image pickup surface of the image pickup device 12g. As a result, the reflected light is imaged by the image pickup element 12g, and the image pickup image data of the observation image 22 of the anterior eye portion of the eye E to be inspected is acquired by the image pickup element 12g. The image pickup device 12g outputs the image pickup image data of the observation image 22 to the control device 9.

Around the objective lens 12a, a kerato plate 12h and a keratling light source 12i used for measuring the corneal shape of the cornea Ec of the eye to be inspected E are provided. The kerato plate 12h and the keratling light source 12i project a single or multiple ring-shaped light flux onto the corneal Ec of the anterior eye portion. The ring-shaped light flux reflected by the corneal Ec is incident on the image pickup surface of the image pickup device 12g via the objective lens 12a, the dichroic filter 12b, and the like. As a result, the keratling image is imaged by the image sensor 12g. The image pickup device 12g outputs the image pickup image data of the keratling image to the control device 9.

(Z alignment optical system)
The Z alignment optical system 13 is used to detect the alignment state of the measurement head 5 with respect to the eye E to be inspected in the Z axis direction. The Z alignment optical system 13 is provided at two locations behind the kerato plate 12h (on the image sensor 12g side). Each Z alignment optical system 13 has an alignment light source 13a and a projection lens 13b. Each alignment light source 13a emits a luminous flux toward the projection lens 13b. The pair of luminous fluxes emitted from each alignment light source 13a are converted into parallel luminous fluxes by each projection lens 13b, and then transmitted through a pair of transmission holes (not shown) of the kerato plate 12h and projected onto the cornea Ec. ..

The pair of light fluxes reflected by the cornea Ec are incident on the image pickup surface of the image pickup element 12g via the objective lens 12a, the dichroic filter 12b, and the like. As a result, the pair of bright spot images is imaged by the image pickup device 12g, and the image pickup element 12g outputs the captured image data of the pair of bright spot images to the control device 9. As a result, the monitor 7 can display a pair of bright spot images together with the above-mentioned observation image 22 and the keratling image. Then, the control device 9 automatically or the examiner manually drives an electric drive mechanism (not shown) so that, for example, the above-mentioned keratling image and the pair of bright spot images have a predetermined positional relationship. By moving 5 in the Z-axis direction, alignment in the Z-axis direction (Z alignment) is executed. In addition, you may use another known method for Z alignment.

(XY alignment optical system)
The XY alignment optical system 14 is used to detect the alignment state of the measurement head 5 with respect to the eye E to be inspected in the X-axis direction and the Y-axis direction. The XY alignment optical system 14 forms an optical path branched from the observation optical system 12 via the half mirror 12c. The XY alignment optical system 14 has an alignment light source 14a and a projection lens 14b. The alignment light source 14a emits a luminous flux toward the projection lens 14b. The luminous flux emitted from the alignment light source 14a is converted into a parallel luminous flux by the projection lens 14b, reflected by the half mirror 12c, and projected onto the cornea Ec via the dichroic filter 12b and the objective lens 12a.

The luminous flux reflected by the corneal Ec is incident on the image pickup surface of the image pickup device 12g via the objective lens 12a, the dichroic filter 12b, and the like. As a result, the bright spot image is imaged by the image pickup device 12g, and the image pickup element 12g outputs the captured image data of the bright spot image to the control device 9. As a result, the monitor 7 can display the bright spot image for XY alignment together with the above-mentioned observation image 22, the keratling image, and the pair of bright spot images. Then, the control device 9 automatically or the examiner manually drives an electric drive mechanism (not shown) to adjust the positions of the bright spot image in the X-axis direction and the Y-axis direction, thereby adjusting the positions in the X-axis direction and the Y-axis direction. Directional alignment (XY alignment) is performed. In addition, other known methods may be used for XY alignment.

(Structure of optotype projection optical system)
The optotype projection optical system 15 projects the light beam of the fixation target onto the fundus Ef of the eye E to be examined in order to fix the eye E or fog the eye E when the objective measurement of the optical refractive power of the eye E is measured. During the subjective examination in the remeasurement mode, the light beam of the optotype chart 26 (see FIG. 3) is projected onto the fundus Ef.

The optotype projection optical system 15 includes an LED light source 15a using an LED (light emitting diode) that generates white light, a color correction filter 15b, a collimator lens 15c, a chart plate 15d, a half mirror 15e, and a relay lens 15f. A reflection mirror 15g, a focusing lens 15h (also referred to as a moving lens), a relay lens 15i, a field lens 15j, a VCS lens 15k which is a variable cross cylinder lens, and a reflection mirror 15m. , A dichroic filter 15n, 12b, and an objective lens 12a. Since each part constituting the optotype projection optical system 15 is a known technique, the details thereof will be omitted.

Further, the optotype projection optical system 15 has a glare light source 15p used for the glare test of the eye E to be inspected. The glare light source 15p emits glare light to the half mirror 15e during the glare test. As a result, glare light is applied to the eye E to be inspected through each part from the half mirror 15e to the objective lens 12a.

The chart plate 15d is a disk on which a plurality of optotypes are formed. The chart plate 15d has a rotation axis parallel to the optical path 15q of the white light emitted from the LED light source 15a. The chart plate 15d is rotationally driven by a chart plate drive mechanism 20 (configured by a motor or the like) connected to the rotation axis, so that any one of a plurality of optotypes is selectively inserted into the optical path 15q. do. As a result, the optotype inserted in the optical path 15q is illuminated by the white light incident from the LED light source 15a via the color correction filter 15b and the collimator lens 15c. As a result, the luminous flux of the optotype is emitted from the chart plate 15d toward the half mirror 15e, and the luminous flux of the optotype is further projected onto the fundus Ef through each part from the half mirror 15e to the objective lens 12a.

The chart plate 15d constitutes the first luminous flux emitting unit of the present invention together with the LED light source 15a, the color correction filter 15b, and the collimator lens 15c. In addition, instead of the chart plate 15d or the like, as the first light beam emitting unit of the present invention, a liquid crystal display (LCD) capable of emitting a light beam of an arbitrary target, a micro display (also referred to as a micro display projector), and the like. A transmissive LCD, a microscanner for image generation, or the like may be used. Further, these LCDs and the like may be arranged on the optical axis O2.

A fixative and a target chart 26 (see FIG. 3) are formed on the chart plate 15d as a plurality of types of optotypes. The fixative is a fixative for fixing or fogging the eye E to be inspected, and for example, a landscape chart or the like is used.

FIG. 3 is an explanatory diagram for explaining an example of a plurality of types of optotype charts 26 formed on the chart plate 15d. As shown in FIG. 3, each optotype chart 26 is an optotype (Randall ring) used for a subjective examination of the visual acuity value of the eye E to be inspected, and is formed on the chart plate 15d according to the visual acuity value. Each optotype chart 26 is selectively inserted into the optical path 15q by the chart plate driving mechanism 20 rotationally driving the chart plate 15d. As a result, the light fluxes of the plurality of target charts 26 having different visual acuity values are selectively emitted from the chart plate 15d toward the half mirror 15e, and the light flux further passes through each part from the half mirror 15e to the objective lens 12a to the fundus. It is projected on Ef. Each of these optotype charts 26 is used in the subjective examination of the remeasurement mode described later.

The type of the optotype chart 26 used in the remeasurement mode described later is not limited to the Randolt ring shown in FIG. 3, and various known types used for the subjective examination of the visual acuity value of the eye E to be inspected. An arbitrary optotype such as an optotype chart 26 (E-character optometry or the like) or a landscape chart can be used.

Returning to FIG. 2, the optotype projection optical system 15 has an optical axis O2 (corresponding to the first optical axis of the present invention) parallel to the above-mentioned main optical axis O1. A focusing lens 15h, a relay lens 15i, a field lens 15j, a VCS lens 15k, and the like are arranged on the optical axis O2.

The in-focus lens 15h corresponds to the first lens and “one” of the present invention, and is arranged so as to be able to move forward and backward along the optical axis O2 of the optotype projection optical system 15. The focusing lens 15h is moved back and forth on the optical axis O2 by the interlocking movement mechanism 27 described later. In this embodiment, the lens position of the in-focus lens 15h is represented by a Diopter (D) conversion value.

As shown by the arrow "minus [D]" in the figure, the lens position on the optical axis O2 of the focusing lens 15h is on the traveling direction side of the luminous flux of the optotype (fixation target, optotype chart 26), that is, the eye to be inspected. By moving it to the E side, the refractive power of the luminous flux of the optotype can be displaced to the minus side. Conversely, as shown by the arrow "plus [D]" in the figure, by moving the lens position of the focusing lens 15h in the direction away from the eye E to be inspected, the refractive power of the luminous flux of the optotype is moved to the plus side. It can be displaced. Therefore, the presentation distance of the optotype chart 26 with respect to the eye E to be inspected can be changed by moving the focusing lens 15h forward and backward. In addition, the eye E to be inspected can be fixed or fogged by the fixative.

The VCS lens 15k has a pair of positive and negative cylinder lenses. The pair of cylinder lenses can rotate independently about the optical axis O2. The VCS lens 15k has a function of correcting (correcting) the cylindrical power (astigmatism power) and the axis angle (astigmatism axis angle) among the aberrations caused by the refraction characteristics of the eye E to be inspected.

The VCS lens 15k is driven by a VCS lens drive mechanism 19 (see FIG. 4) configured by a motor or the like under the control of the control device 9. The astigmatism degree can be adjusted by rotating the pair of cylinder lenses in opposite directions by the VCS lens drive mechanism 19, and the astigmatism axis angle can be adjusted by rotating them integrally in the same direction.

(Structure of pattern projection optical system for measurement)
The measurement pattern projection optical system 16 projects a light beam of a ring-shaped measurement pattern (hereinafter, simply referred to as a measurement pattern) used for measuring the objective refractive power of the eye to be inspected E on the fundus Ef. The measurement pattern projection optical system 16 includes a reflex measurement unit 16a, a relay lens 16b, a pupil ring 16c, a field lens 16d, a perforated prism 16e, a rotary prism 16f, a dichroic filter 15n, and a dichroic filter 12b. , And an objective lens 12a. Since each part constituting the measurement pattern projection optical system 16 is a known technique, the details thereof will be omitted.

Further, the measurement pattern projection optical system 16 has an optical axis O3 (corresponding to the second optical axis of the present invention) parallel to the main optical axis O1 and the optical axis O2 described above. A reflex measurement unit 16a, a relay lens 16b, a pupil ring 16c, a field lens 16d, and a perforated prism 16e are arranged on the optical axis O2.

The reflex measurement unit 16a corresponds to the second light flux emitting unit of the present invention, and has an LED light source 16h, a collimator lens 16i, a conical prism 16j, and a measurement pattern forming plate 16k. The LED light source 16h and the pupil ring 16c are arranged at positions that are optically conjugate. Further, the forming plate 16k and the fundus Ef are arranged at positions optically conjugate to each other.

The reflex measurement unit 16a is arranged so as to be able to move forward and backward along the optical axis O3 of the measurement pattern projection optical system 16. The reflex measurement unit 16a is moved back and forth on the optical axis O3 by the interlocking movement mechanism 27 described later.

The luminous flux emitted from the LED light source 16h is converted into parallel light by the collimator lens 16i, and then converted into the luminous flux of the measurement pattern through the conical prism 16j and the forming plate 16k. As a result, the luminous flux of the measurement pattern is emitted toward the relay lens 16b. This luminous flux passes through the relay lens 16b, the pupil ring 16c, the field lens 16d, the reflective surface of the perforated prism 16e, the rotary prism 16f, the dichroic filter 15n, the dichroic filter 15n, the dichroic filter 12b, and the objective lens 12a to the fundus Ef. It is projected. The luminous flux of the measurement pattern is projected onto the fundus Ef in a state where the shape is distorted by the optical refractive power of the eye E to be inspected.

(Structure of light receiving optical system)
The light receiving optical system 17 receives (detects) the fundus reflected light of the light flux of the measurement pattern projected on the fundus Ef by the measurement pattern projection optical system 16. The light receiving optical system 17 includes an objective lens 12a, a dichroic filter 12b, 15n, a rotary prism 16f, a perforated prism 16e, a field lens 17a, a reflection mirror 17b, a relay lens 17c, and a focusing lens 17d (moving). It also has a lens), a reflection mirror 17e, a dichroic filter 12e, an imaging lens 12f, and an image pickup element 12g. Since each part constituting the light receiving optical system 17 is a known technique, the details thereof will be omitted.

Further, the light receiving optical system 17 has the above-mentioned main optical axis O1, optical axis O2, and optical axis O4 parallel to the optical axis O3 (corresponding to the third optical axis of the present invention). A reflection mirror 17b, a relay lens 17c, a focusing lens 17d, and a reflection mirror 17e are arranged on the optical axis O4.

The focusing lens 17d corresponds to the second lens of the present invention, and is arranged so as to be able to move forward and backward along the optical axis O4 of the light receiving optical system 17. The focusing lens 17d is moved back and forth on the optical axis O4 by the interlocking movement mechanism 27 described later.

The fundus reflected light of the light beam of the measurement pattern reflected by the fundus Ef includes an objective lens 12a, a dichroic filter 12b, 15n, a rotary prism 16f, a hole of a perforated prism 16e, a field lens 17a, a reflection mirror 17b, and a relay lens. It is incident on the light receiving surface of the image pickup element 12g via the 17c, the focusing lens 17d (also referred to as a moving lens), the reflection mirror 17e, the dichroic filter 12e, and the imaging lens 12f. The image pickup device 12g captures the fundus reflected light and outputs the captured image data of the captured image 23 of the fundus reflected light to the control device 9.

Although not shown, the interlocking movement mechanism 27 includes a holding member that integrally holds (connects) the focusing lens 15h, the reflex measuring unit 16a, and the focusing lens 17d, and the main optical axis O1 (each optical axis). It is provided with a slide mechanism for holding the holding member so as to be slidably movable in a parallel direction (Z-axis direction) with respect to the axes O2 to O4), and a drive mechanism such as a motor for moving the holding member forward and backward in the Z-axis direction. As a result, the focusing lens 15h, the reflex measuring unit 16a, and the focusing lens 17d are interlocked (integrally) moved along the Z-axis direction by the interlocking movement mechanism 27. In addition, the interlocking movement (interlocking movement) referred to here is a direction in which the focusing lens 15h, the reflex measuring unit 16a, and the focusing lens 17d are moved toward or away from the eye E to be inspected on each optical axis O2 to O4. It is to move with the same amount of movement.

[Control device configuration]
FIG. 4 is a functional block diagram of the control device 9. As shown in FIG. 4, the control device 9 includes an arithmetic circuit composed of various processors, memories, and the like. Various processors include CPU (Central Processing Unit), GPU (Graphics Processing Unit), ASIC (Application Specific Integrated Circuit), and programmable logic devices [for example, SPLD (Simple Programmable Logic Devices), CPLD (Complex Programmable Logic Device), etc. And FPGA (Field Programmable Gate Arrays)] and the like. The various functions of the control device 9 may be realized by one processor, or may be realized by a plurality of processors of the same type or different types.

The control device 9 comprehensively operates each part of the ophthalmic device 1 by executing a control program read from a storage unit (not shown) based on the input operation of the examiner to the operation lever 6 and the touch panel type monitor 7. Control. In addition to the operation lever 6 and the monitor 7, the control device 9 includes an image pickup element 12g of the optical system 8 described above, a keratling light source 12i, an alignment light source 13a, 14a, an LED light source 15a, a glare light source 15p, and an LED light source 16h. , The VCS lens drive mechanism 19, the chart plate drive mechanism 20, the interlocking movement mechanism 27, and the like are connected. Further, the control device 9 is connected to an operation switch 29 operated by the subject in the remeasurement mode described later.

By executing the above-mentioned control program, the control device 9 functions as an operation control unit 30, an alignment control unit 32, a measurement control unit 34, and an eye characteristic calculation unit 36. Hereinafter, what is described as "-part" in this embodiment may be "-circuit", "-device", or "-equipment". That is, what is described as "... part" may be composed of firmware, software, and hardware or a combination thereof.

The operation control unit 30 includes a light source control unit 40, a drive control unit 42, an image pickup control unit 44, a display control unit 46, a chart plate drive control unit 48, and a VCS lens drive control unit 50.

Under the control of the measurement control unit 34 described later, the light source control unit 40 has each light source (keratling light source 12i, alignment light source 13a, 14a, LED light source 15a, glare light source 15p, and LED light source) connected to the control device 9. 16h) Controls on / off.

The drive control unit 42 drives an electric drive mechanism (not shown) in response to an operation (tilt operation and rotation operation) with respect to the operation lever 6 to move the measurement head 5 in each axial direction of the XYZ axes. Further, the drive control unit 42 drives the interlocking movement mechanism 27 under the control of the measurement control unit 34 described later, and interlocks the focusing lens 15h, the reflex measurement unit 16a, and the focusing lens 17d (integrally). ) Move along the Z-axis direction.

The image pickup control unit 44 drives the image pickup element 12g under the control of the measurement control unit 34 described later, and comprises the above-mentioned observation image 22, a pair of bright spot images for Z alignment, and a bright spot image for XY alignment. And the imaging of each captured image data of the captured image 23 is executed.

The display control unit 46 controls the image display on the monitor 7. The display control unit 46 causes the monitor 7 to display the observation image 22, the captured image 23 (ring image 24), and the operation screen 25 (see FIG. 9) showing the measurement status in the remeasurement mode described later.

The chart plate drive control unit 48, under the control of the measurement control unit 34 described later, drives the chart plate drive mechanism 20 to rotate the chart plate 15d, whereby a plurality of optotypes formed on the chart plate 15d ( The fixative and the optotype chart 26 etc.) are selectively inserted into the optical path 15q. Thereby, the luminous flux of the optotype can be projected from the optotype projection optical system 15 onto the fundus Ef according to the type of the optotype.

The VCS lens drive control unit 50 measures this when the measurement result of the astigmatism state (astigmatism degree and astigmatism axis) of the eye E to be inspected obtained by known objective measurement or the like is input to the touch panel type monitor 7. Based on the result, the astigmatism state of the eye E to be inspected is corrected by driving the VCS lens drive mechanism 19 to rotate the pair of cylinder lenses.

The alignment control unit 32 controls each part of the motion control unit 30 to perform alignment (auto alignment or manual alignment) of the measurement head 5 with respect to the eye to be inspected E before starting the objective measurement of the eye characteristics of the eye to be inspected E. Run. This alignment is performed in a state where the eye E is fixed on the fixative (landscape chart), but since the specific method is a known technique, the description thereof is omitted here.

The measurement control unit 34 controls each unit of the motion control unit 30 to perform objective measurement and subjective examination of the eye characteristics (here, eye refractive power) of the eye E to be inspected. Since the measurement of the corneal shape is basically the same as the conventional one, a specific description thereof will be omitted. Hereinafter, the eye characteristic of the eye E to be inspected refers to the characteristic (in the present embodiment, the optical refractive power) obtained by analyzing the ring image 24.

The measurement control unit 34 has an objective measurement mode, a subjective test mode, and a remeasurement mode as measurement modes for measuring the eye characteristics of the eye to be inspected E. These measurement mode switching operations are executed in response to the input of the mode switching operation to the touch panel type monitor 7.

When the objective measurement mode is selected, the measurement control unit 34 controls each unit of the motion control unit 30 to execute the objective measurement of the optical refractive power of the eye E to be inspected. In this case, after the alignment described above is executed, the measurement control unit 34 drives the interlocking movement mechanism 27 via the drive control unit 42 to move the focusing lens 15h by + 1.5D to the eye to be inspected. Let E be in a cloud fog view state. Next, the measurement control unit 34 controls the light source control unit 40 to turn on the LED light source 16h, and causes the measurement pattern projection optical system 16 to project the luminous flux of the measurement pattern onto the fundus Ef. Then, the measurement control unit 34 controls the image pickup control unit 44 to cause the image pickup element 12g to capture the image pickup of the fundus reflected light of the measurement pattern reflected by the fundus Ef, and the eye characteristic calculation unit described later from the image pickup element 12g. The 36 is made to output the captured image data of the captured image 23.

When the subjective test mode is selected, the measurement control unit 34 controls each part of the motion control unit 30 to perform a subjective test (distance test, near-field test, contrast test, and glare test) of the eye characteristics of the eye E to be inspected. And so on). In this case, the measurement control unit 34 controls the light source control unit 40 to light the LED light source 15a, and also drives the chart plate drive mechanism 20 to drive the chart plate 15d as a target for subjective inspection (target chart 26, etc.). ) Is inserted into the optical path 15q. As a result, the luminous flux of the target for subjective examination is projected from the optical target projection optical system 15 onto the fundus Ef, so that the subject responds to the target for subjective examination. Further, when performing a glare inspection, the measurement control unit 34 controls the light source control unit 40 to turn on the glare light source 15p.

When the remeasurement mode is selected, the measurement control unit 34 controls each unit of the motion control unit 30 to remeasure the objective measurement of the optical refractive power of the eye E to be inspected. This remeasurement mode is executed when the objective measurement of the optical refractive power of the eye to be inspected E is impossible in the above-mentioned objective measurement mode. When this objective measurement is not possible, the focus of the luminous flux of the measurement pattern emitted from the measurement pattern projection optical system 16 is deviated from the fundus Ef even after the alignment is completed due to a disease of the eye E to be inspected or the like. Or, the ring image 24 cannot be detected from the captured image 23. When the remeasurement mode is selected, the measurement control unit 34 executes the objective test of the eye to be inspected E in combination with the subjective test of the eye to be inspected E, which will be described in detail later.

The eye characteristic calculation unit 36 analyzes the captured image data of the captured image 23 input from the image pickup element 12g, detects the ring image 24 from the captured image 23, and analyzes the shape of the ring image 24 (ellipse approximation, etc.). Is performed, and the optical refractive power of the eye to be inspected E is calculated based on the shape analysis result of the ring image 24. Since the specific calculation method of the ocular refractive power is a known technique, a specific description thereof will be omitted here.

(Remeasurement mode)
Next, the remeasurement mode will be described. When the measurement control unit 34 is switched to the remeasurement mode, the measurement control unit 34 first executes a subjective test of the eye E to be inspected, and the eye E to be inspected is the optotype chart 26 for each of a plurality of types of optotype charts 26 having different visual acuity values. Acquires the lens position (stop position described later) of the focusing lens 15h capable of recognizing. Next, the measurement control unit 34 focuses the focusing lens 15h for focusing the luminous flux of the optotype chart 26 on the fundus Ef based on the lens position (stop position) of the focusing lens 15h for each optotype chart 26. Estimated value) is determined. Then, the measurement control unit 34 re-executes the objective measurement of the eye characteristics of the eye E to be inspected after positioning the focusing lens 15h at the focusing position.

In the remeasurement mode, the measurement control unit 34 functions as a subjective inspection control unit 52, a focusing position determination unit 54, a positioning control unit 56, and an objective measurement control unit 58.

When the measurement control unit 34 is switched to the remeasurement mode, the subjective inspection control unit 52 executes the subjective inspection of the eye E to be inspected for determining the in-focus position described above. In this subjective test, the optotype chart 26 is presented to the eye E to be inspected, the focusing lens 15h is moved along the optical axis O2, and the eye to be inspected E is at a position where the optotype chart 26 is consciously recognized. The reception of the stop operation of the movement process and the stop control of the move process are repeatedly executed for each of a plurality of optometric charts 26 having different visual acuity values. Therefore, the subjective inspection control unit 52 functions as an emission control unit 52a, a movement control unit 52b, a stop operation reception unit 52c, a stop control unit 52d, and a repetitive control unit 52e.

When the measurement control unit 34 is switched to the remeasurement mode, the emission control unit 52a controls the light source control unit 40 to turn on the LED light source 15a, and also controls the chart plate drive mechanism 20 via the chart plate drive control unit 48. It is driven to insert the optotype chart 26 having the lowest visual acuity value in the chart plate 15d into the optical path 15q. As a result, the luminous flux of the optotype chart 26 having a visual acuity value of “0.1” is projected onto the fundus Ef.

Further, the emission control unit 52a drives the chart plate drive mechanism 20 via the chart plate drive control unit 48 in response to the input of the optotype switching operation to the monitor 7, and is the second visual acuity in the chart plate 15d. The optotype chart 26 having a low value is inserted into the optical path 15q. As a result, the luminous flux of the optotype chart 26 having a visual acuity value of “0.2” is projected onto the fundus Ef.

Hereinafter, the emission control unit 52a drives the chart plate drive mechanism 20 via the chart plate drive control unit 48 each time the optotype switching operation is input to the monitor 7, whereby the remaining optotype chart 26 Is inserted into the optical path 15q in order from the one with the lowest visual acuity value. As a result, the luminous flux of the optotype chart 26 is projected from the optotype projection optical system 15 onto the fundus Ef in order from the one with the lowest visual acuity value. In the subjective test of this embodiment, the visual acuity values are "0.1", "0.2", "0.3", "0.5", "0.8", and "1.0", for a total of 6 Although the type of optotype chart 26 is used, the type of the optotype chart 26 may be increased or decreased as appropriate.

When the optotype chart 26 having a visual acuity value of “0.1” is presented to the eye E to be inspected, the movement control unit 52b drives the interlocking movement mechanism 27 via the drive control unit 42 to drive the focusing lens 15h. , The eye to be inspected E is moved to an initial position (for example, + 1.5D when the eye to be inspected E is a myopic eye, see FIG. 5 described later), which is a lens position for cloud fog. Next, the movement control unit 52b drives the interlocking movement mechanism 27 via the drive control unit 42 to move the focusing lens 15h from the initial position along the optical axis O2 in the minus [D] direction for the first time. Perform processing. As a result, the eye E to be inspected can recognize the optotype chart 26. In this case, the lower the visual acuity value of the eye E to be inspected, the larger the amount of movement of the focusing lens 15h.

Then, the movement control unit 52b continues the first movement processing of the focusing lens 15h until it is stopped by the stop control unit 52d described later. In conjunction with the movement of the focusing lens 15h, the reflex measuring unit 16a and the focusing lens 17d are also integrally moved in the minus [D] direction by the interlocking movement mechanism 27.

Further, the movement control unit 52b drives the interlocking movement mechanism 27 via the drive control unit 42 each time a repetitive control command is input from the repetitive control unit 52e described later in response to the above-mentioned optotype switching operation. , The second and subsequent movement processes for moving the focusing lens 15h from the previous stop position along the optical axis O2 in the minus [D] direction are executed. The movement control unit 52b also continues the second and subsequent movement processes until it is stopped by the stop control unit 52d, which will be described later.

The stop operation reception unit 52c receives the stop operation of the movement process input to the touch panel type monitor 7 or the operation switch 29 while the movement control unit 52b is executing the movement process of the focusing lens 15h. This stop operation is an operation for stopping the movement process at a position where the eye E to be inspected subjectively recognizes the optotype chart 26. For example, when the subject recognizes the optotype chart 26 during the movement process of the focusing lens 15h, the examiner inputs a stop operation to the monitor 7 in response to a signal from the subject, or When the subject directly operates the operation switch 29 to input the stop operation, the stop operation reception unit 52c accepts the stop operation of the movement process.

When the stop operation reception unit 52c receives the stop operation, the stop control unit 52d controls the drive control unit 42 to drive and stop the interlocking movement mechanism 27 to stop the movement process of the focusing lens 15h. Further, the stop control unit 52d detects a stop position which is a lens position of the focusing lens 15h stopped on the optical axis O2, and outputs information about this stop position to the focusing position determination unit 54 described later. The stop position of the focusing lens 15h can be detected by various known methods such as detection using various position detection sensors or detection from the count value of the rotation speed of the motor of the interlocking movement mechanism 27.

When the luminous flux of the optotype chart 26 having a high visual acuity value (for example, “1.0”) is projected onto the fundus Ef, depending on the state of the eye E to be inspected, even if the moving process of the focusing lens 15h is continued. The target chart 26 may not be recognized by the eye E to be inspected. Therefore, when the movement amount or movement time of the focusing lens 15h exceeds a predetermined upper limit value, the stop control unit 52d controls the drive control unit 42 to stop the movement processing of the focusing lens 15h. , The detection of the stop position of the focusing lens 15h is not executed.

The repeat control unit 52e projects the luminous flux of the optotype chart 26 corresponding to the new visual acuity value from the optotype projection optical system 15 to the fundus Ef each time the optotype switching operation is input to the monitor 7. The movement control unit 52b, the stop operation reception unit 52c, and the stop control unit 52d are repeatedly operated each time. As a result, the second and subsequent movement processes of the focusing lens 15h by the movement control unit 52b, the reception of the stop operation by the stop operation reception unit 52c, and the stop control of the movement processing by the stop control unit 52d are repeatedly executed. ..

FIG. 5 is an explanatory diagram for explaining the first movement process, stop operation reception, and stop control by each part of the subjective inspection control unit 52 corresponding to the visual acuity chart 26 having a visual acuity value of “0.1”. .. As shown by the reference numeral VA in FIG. 5, when the measurement control unit 34 is switched to the remeasurement mode, the visual acuity value “0.1” is controlled by the light source control unit 40 and the chart plate drive control unit 48 by the emission control unit 52a. The luminous flux of the optotype chart 26 is projected onto the fundus Ef. Further, the focusing lens 15h is moved to the initial position (+ 1.5D) by the control of the drive control unit 42 (interlocking movement mechanism 27) by the movement control unit 52b. Hereinafter, these states are referred to as "initial states". In the initial state, since the eye E to be inspected is in a cloud fog state, the optotype chart 26 having a visual acuity value of "0.1" cannot be recognized by the eye E to be inspected.

When the eye to be inspected E is a hyperopic eye, the initial position of the focusing lens 15h is set to the plus [D] side of + 1.5D.

When the optotype chart 26 and the focusing lens 15h are set in the initial state, the movement control unit 52b drives the interlocking movement mechanism 27 via the drive control unit 42 to move the focusing lens 15h from the initial position to the optical axis O2. The first movement process of moving in the minus [D] direction is started. Further, in conjunction with the movement of the focusing lens 15h, the reflex measuring unit 16a and the focusing lens 17d are integrally moved in the minus [D] direction by the interlocking movement mechanism 27.

As shown by the reference numeral VB in FIG. 5, when the movement process of the focusing lens 15h in the minus [D] direction is continued, the eye E to be inspected displays the optotype chart 26 having a visual acuity value of “0.1” at some point. Can be recognized consciously. When the eye E recognizes the optotype chart 26, the examiner inputs a stop operation to the monitor 7 by a signal from the examinee, or the examinee inputs a stop operation to the operation switch 29. By doing so, the stop operation reception unit 52c receives the stop operation of the first movement process.

Next, the stop control unit 52d controls the drive control unit 42 to drive and stop the interlocking movement mechanism 27, thereby stopping the first movement process of the focusing lens 15h. Further, the stop control unit 52d detects the stop position (+ 1.25D in this embodiment) of the focusing lens 15h, and outputs information about this stop position to the focusing position determination unit 54. This completes the first movement process corresponding to the visual acuity chart 26 having a visual acuity value of "0.1".

FIG. 6 is an explanatory diagram for explaining the second movement process, stop operation reception, and stop control by each part of the subjective inspection control unit 52 corresponding to the visual acuity chart 26 having a visual acuity value “0.2”. .. When the first movement process is completed, the examiner inputs the optotype switching operation to the monitor 7. As a result, the emission control unit 52a drives the chart plate drive mechanism 20 via the chart plate drive control unit 48 to project the luminous flux of the optotype chart 26 having a visual acuity value of “0.2” onto the fundus Ef. Next, the repeat control unit 52e repeatedly operates the movement control unit 52b, the stop operation reception unit 52c, and the stop control unit 52d.

As shown by the reference numeral VIA in FIG. 6, the movement control unit 52b drives the interlocking movement mechanism 27 via the drive control unit 42 to move the focusing lens 15h from the previous (first time) stop position (+ 1.25D). The second movement process of moving in the minus [D] direction along the optical axis O2 is started. In conjunction with the movement of the focusing lens 15h, the reflex measuring unit 16a and the focusing lens 17d are also integrally moved in the minus [D] direction by the interlocking movement mechanism 27.

As shown by the reference numeral VIB in FIG. 6, when the movement process of the focusing lens 15h in the minus [D] direction is continued, the eye E to be inspected displays the optotype chart 26 having a visual acuity value of “0.2” at some point. Can be recognized consciously. When the eye E to be inspected recognizes the optotype chart 26, the stop operation reception unit 52c accepts the stop operation of the second movement process in response to the stop operation by the examiner or the subject, and the stop control unit 52d receives the drive control unit. The second movement process is stopped by driving and stopping the interlocking movement mechanism 27 via the 42. Then, the stop control unit 52d detects the stop position (+ 1.00D in this embodiment) of the focusing lens 15h, and outputs information about this stop position to the focusing position determination unit 54. This completes the second movement process corresponding to the visual acuity chart 26 having a visual acuity value of “0.2”.

Similarly, each time the target switching operation is input to the monitor 7, the projection of the luminous flux of the target chart 26 having a higher visual acuity value than the previous time on the fundus Ef, the movement process of the focusing lens 15h, and the stop are performed. The reception of the operation, the stop of the movement process, and the detection of the stop position are repeatedly executed.

FIG. 7 shows the focusing lens 15h after the fifth movement process, stop operation reception, and stop control by each part of the subjective inspection control unit 52 corresponding to the visual acuity chart 26 with a visual acuity value of “0.8” are completed. It is explanatory drawing for demonstrating the lens position of. As shown in FIG. 7, by executing the fifth movement process, stop operation reception, and stop control in a state where the luminous flux of the optotype chart 26 having a visual acuity value of “0.8” is projected onto the fundus Ef, the movement process, the stop operation reception, and the stop control are executed. For example, in the present embodiment, the stop position of the focusing lens 15h moves to + 0.25D.

In this way, as the luminous flux of the optotype chart 26 having a higher visual acuity value than the previous time is projected onto the fundus Ef, that is, as the visual acuity value of the optotype chart 26 presented to the eye E to be inspected increases. The stop position of the focusing lens 15h moves to the E side of the eye to be inspected (minus [D] direction side).

At this time, the reflex measuring unit 16a and the focusing lens 17d are integrally moved to the eye E side in conjunction with the movement of the focusing lens 15h by the interlocking movement mechanism 27. Therefore, when the focusing lens 15h is located at the stop position corresponding to the target chart 26 having a high visual acuity value (for example, the visual acuity value “0.8” or more) or a position near the stop position, the focusing lens 15h and the reflex measurement are performed. All of the unit 16a and the focusing lens 17d are set at or near the focusing position with respect to the eye E to be inspected. As a result, the luminous flux of the measurement pattern projected from the measurement pattern projection optical system 16 onto the fundus Ef according to the focus of the luminous flux on the optotype chart 26 coincides with the fundus Ef (including substantially matching, the same applies hereinafter). The focus can be aligned with the fundus Ef. As a result, as shown in FIG. 14 described above, the ring image 24 is detected from the captured image 23 with a size suitable for the calculation of the optical refractive power, that is, the ring image 24 is detected within the range of the scale 100.

Returning to FIG. 4, the focusing position determination unit 54 focuses the light beam of the optotype chart 26 on the fundus Ef based on the detection result of the stop position for each optotype chart 26 by the stop control unit 52d. The in-focus position (estimated value) on the optical axis O2 of is determined. As described above, since the in-focus lens 15h, the reflex measurement unit 16a, and the in-focus lens 17d move in conjunction with each other by the interlocking movement mechanism 27, the in-focus position of the in-focus lens 15h determines the light beam of the measurement pattern. The focusing position (estimated position) of the reflex measuring unit 16a for focusing on the fundus Ef and the focusing position (estimated value) of the focusing lens 17d corresponding thereto are shown.

FIG. 8 is an explanatory diagram for explaining a method of determining the focusing position of the focusing lens 15h by the focusing position determining unit 54. As shown in FIG. 8, the focusing position determining unit 54 determines the type (visual acuity value) and the stop position (lens position) of the optotype chart 26 based on the detection result of the stop position for each optotype chart 26 by the stop control unit 52d. ), The correspondence information 60 indicating the correspondence relation with) is generated. Then, the focusing position determination unit 54 determines the focusing position of the focusing lens 15h by the following first determination method or second determination method based on the correspondence information 60. Although the correspondence information 60 is graphed in FIG. 8, it may be expressed in another format. Further, in FIG. 8, it is assumed that the optotype chart 26 having a visual acuity value of “1.0” is not recognized by the eye E to be inspected.

When the first determination method is selected, the focusing position determination unit 54 has a stop position corresponding to the optotype chart 26 having the highest visual acuity value among the stop positions (see arrow A1 in the figure) based on the correspondence information 60. ), That is, the stop position (+ 0.25D) corresponding to the optotype chart 26 having a visual acuity value of “0.8” is determined as the in-focus position of the in-focus lens 15h.

Further, when the second determination method is selected, the in-focus position determination unit 54 corresponds to the optotype chart 26 having a visual acuity value (for example, “1.0”) equal to or higher than a predetermined reference value based on the correspondence information 60. The estimated stop position (see arrow A2 in the figure), which is the stop position, is calculated using a known fitting method such as the least squares method, and this estimated stop position is determined as the in-focus position of the focusing lens 15h.

Then, the focusing position determination unit 54 outputs the determination result of the focusing position of the focusing lens 15h determined by the first determination method or the second determination method to the positioning control unit 56.

Returning to FIG. 4, the positioning control unit 56 drives the interlocking movement mechanism 27 via the drive control unit 42 based on the in-focus position determination result of the in-focus lens 15h input from the in-focus position determination unit 54. Then, the focusing lens 15h is positioned at the focusing position. As a result, the reflex measurement unit 16a is positioned on the optical axis O3 at or near the in-focus position with respect to the eye to be inspected E, and the in-focus lens 17d is at or near the in-focus position with respect to the eye to be inspected E on the optical axis O4. Positioned to. As a result, the reflex measuring unit 16a and the focusing lens 17d can be positioned at the focusing position with respect to the eye E estimated from the subjective examination.

The objective measurement control unit 58 controls each part of the motion control unit 30 after the focusing lens 15h is positioned at the focusing position, and the eye refractive force of the eye E to be inspected in the above-mentioned objective measurement mode. Similar to the objective measurement, the transition of the eye E to the cloud fog vision state, the projection of the light beam of the measurement pattern on the fundus Ef, and the imaging of the fundus reflected light of the measurement pattern by the image pickup element 12g are executed. As a result, the captured image data of the captured image 23 is output from the image pickup element 12g to the eye characteristic calculation unit 36, and the eye characteristic calculation unit 36 executes the calculation of the optical refractive power of the eye to be inspected E.

[Operation screen in remeasurement mode]
FIG. 9 is an explanatory diagram showing an example of the operation screen 25 displayed on the monitor 7 in the remeasurement mode. As shown in FIG. 9, the display control unit 46 causes the monitor 7 to display the operation screen 25 in the remeasurement mode. The operation screen 25 includes an observation image display area 62, a subjective inspection display area 64, and a captured image display area 66.

In the observation image display area 62, the observation image 22 of the anterior eye portion of the eye E to be inspected is displayed. The display control unit 46 acquires the captured image data of the observation image 22 of the anterior segment imaged from the image pickup element 12g in the remeasurement mode, and displays the observation image 22 in the observation image display area 62 based on the captured image data. .. Then, the display control unit 46 updates the observation image 22 displayed in the observation image display area 62 every time the captured image data of the new observation image 22 is captured by the image pickup element 12g. As a result, the examiner can confirm the fixative state of the eye E to be inspected.

The subjective test display area 64 displays the status of the subjective test in the remeasurement mode. The subjective inspection display area 64 includes an optotype display area 64a and a status display area 64b.

In the optotype display area 64a, the optotype chart 26 presented to the eye E to be inspected in the subjective examination in the remeasurement mode is displayed. The display control unit 46 acquires information on the type of the optotype chart 26 inserted in the optical path 15q from the above-mentioned emission control unit 52a, and displays an image of the optotype chart 26 in the optical path 15q as an optotype display area. Display on 64a. Thereby, the examiner can confirm the optotype chart 26 presented to the eye E to be inspected.

The status display area 64b includes a lens position display bar 70, an inspection result screen 72, and a display switching icon 74.

The lens position display bar 70 indicates the lens position of the focusing lens 15h during the movement process. The display control unit 46 moves the focusing lens 15h on the optical axis O2 based on the detection result of the position detection sensor (not shown) described above or the count result of the count value of the rotation speed of the motor of the interlocking movement mechanism 27. The lens position of the lens is acquired, and the lens position display bar 70 showing the lens position in a bar display format is displayed in the status display area 64b. Then, the display control unit 46 moves the cursor 70a of the lens position display bar 70 indicating the lens position according to the change in the lens position of the focusing lens 15h on the optical axis O2. As a result, the examiner can determine the lens position of the focusing lens 15h.

The inspection result screen 72 shows the stop position for each of the optotype charts 26 having different visual acuity values. The display control unit 46 generates an inspection result screen 72 based on the detection result of the stop position for each optotype chart 26 detected by the stop control unit 52d and displays it in the status display area 64b. Further, the display control unit 46 sets the type (visual acuity value) of the optotype chart 26 presented to the subject based on the information regarding the type of the optotype chart 26 inserted in the optical path 15q described above. Is displayed so that it can be identified. Thereby, the examiner can determine the stop position for each optotype chart 26.

The icon 74 is operated when the display of the status display area 64b is alternately switched between the lens position display bar 70 and the inspection result screen 72 and the corresponding information 60 (graph) shown in FIG. 8 described above. When the inspector operates the icon 74 while the lens position display bar 70 and the inspection result screen 72 are displayed in the status display area 64b, the display control unit 46 generates the in-focus position determination unit 54 described above. Based on the corresponding information 60, the graph of the corresponding information 60 is displayed in the status display area 64b. Then, when the icon 74 is re-operated by the examiner, the display control unit 46 returns the display of the status display area 64b to the original lens position display bar 70 and the inspection result screen 72.

In the captured image display area 66, the captured image 23 (ring image 24) captured by the image pickup element 12g in the objective measurement of the optical refractive power of the eye E to be inspected is displayed. The display control unit 46 acquires the captured image data of the captured image 23 captured by the image pickup element 12g during the objective measurement in the remeasurement mode, and displays the captured image 23 in the captured image display area 66 based on the captured image data. .. Further, as shown in FIG. 14, the display control unit 46 displays scales 100, 100a, which are indicators of the size of the ring image 24 suitable for calculating the optical refractive power, in the captured image display area 66. It is superimposed and displayed on the captured image 23. By displaying the captured image 23 in the captured image display area 66, the examiner can determine whether or not the ring image 24 is present in the captured image 23, and the ring image 24 has a size suitable for calculating the optical refractive power. You can check if it exists.

[Action of the ophthalmic appliance of this embodiment]
FIG. 10 shows the flow of the objective measurement process of the ophthalmic refractive power of the eye E to be inspected by the ophthalmic apparatus 1 having the above configuration, particularly the measurement process of the optical refractive power in the remeasurement mode (corresponding to the operation method of the ophthalmic apparatus of the present invention). It is a flowchart which shows the flow. Since the process of measuring the refractive power of the eye to be inspected E in the objective measurement mode is a known technique, a specific description thereof will be omitted here.

As shown in FIG. 10, the light flux of the measurement pattern emitted from the measurement pattern projection optical system 16 is out of focus from the fundus Ef due to the disease of the eye E to be inspected, or the ring image 24 is detected from the captured image 23. If it is impossible, the measurement of the optical refractive power of the eye E to be inspected in the objective measurement mode becomes impossible (step S1). In this case, the examiner inputs the mode switching operation to the remeasurement mode to the touch panel type monitor 7. Then, in response to the mode switching operation for the monitor 7, the measurement control unit 34 switches the measurement mode to the remeasurement mode (step S2).

When the measurement control unit 34 is switched to the remeasurement mode, each unit of the subjective inspection control unit 52 operates to determine the focusing position of the focusing lens 15h for focusing the luminous flux of the target on the fundus Ef. The subjective test is started (step S3).

First, the optotype chart 26 and the focusing lens 15h are brought into the initial state by the control of the light source control unit 40 and the chart plate drive control unit 48 by the emission control unit 52a and the control of the drive control unit 42 by the movement control unit 52b. It is set (step S4). As a result, the luminous flux of the optotype chart 26 having a visual acuity value of “0.1” is projected onto the fundus Ef, and the focusing lens 15h is moved to the initial position (+ 1.5D) on the optical axis O2.

Next, as shown in FIG. 5, the movement control unit 52b drives the interlocking movement mechanism 27 via the drive control unit 42 to deduct the focusing lens 15h from the initial position along the optical axis O2. The first movement process of moving in the [D] direction is started (step S5, corresponding to the movement control step of the present invention).

When the first movement process is started, the eye E to be inspected can consciously recognize the optotype chart 26 having a visual acuity value of "0.1" at any time point. Therefore, as described with reference to FIG. 5, the input of the stop operation to the monitor 7 or the operation switch 29, the reception of the stop operation by the stop operation reception unit 52c, and the reception of the stop operation (step S6, in the stop operation reception step of the present invention). (Equivalent), and the stop control unit 52d stops the movement process (step S7, corresponding to the stop control step of the present invention). Further, the stop control unit 52d detects the stop position of the focusing lens 15h and outputs information regarding the stop position to the focusing position determination unit 54. This completes the first movement process corresponding to the visual acuity chart 26 having a visual acuity value of "0.1".

When the first movement process is completed, the examiner inputs the optotype switching operation to the monitor 7. In response to this operation, the emission control unit 52a drives the chart plate drive mechanism 20 via the chart plate drive control unit 48 to project the luminous flux of the target chart 26 having a visual acuity value of “0.2” onto the fundus Ef. (Step S8).

Next, as shown in FIG. 6, the movement control unit 52b drives the interlocking movement mechanism 27 via the drive control unit 42 to move the focusing lens 15h from the first stop position to the optical axis O2. The second movement process of moving in the minus [D] direction along the line is started (step S5).

When the second movement process is started, the eye E to be inspected can consciously recognize the optotype chart 26 having a visual acuity value of "0.2" at any time point. As a result, the processes of steps S6 and S7 described above are repeatedly executed (see FIG. 6). Further, in step S7, the stop control unit 52d detects the stop position of the focusing lens 15h and outputs information about the stop position to the focusing position determination unit 54. This completes the second movement process corresponding to the visual acuity chart 26 having a visual acuity value of “0.2”.

Similarly, each time the optotype switching operation is input to the monitor 7, the above-mentioned processes from step S5 to step S7 are repeatedly executed. Then, when the sixth movement process corresponding to the visual acuity chart 26 with the visual acuity value "1.0" is completed, the subjective examination of the eye E to be inspected is completed (NO in step S8, step S9).

When the subjective test is completed, the focusing position determination unit 54 generates the correspondence information 60 shown in FIG. 8 described above based on the detection result of the stop position for each optotype chart 26, and further, based on this correspondence information 60, has already been generated. The focusing position of the focusing lens 15h is determined by the first determination method or the second determination method described above (step S10, corresponding to the focusing position determination step of the present invention). Then, the focusing position determination unit 54 outputs the determination result of the focusing position of the focusing lens 15h to the positioning control unit 56.

Next, the positioning control unit 56 receives the input of the determination result from the focusing position determination unit 54 and drives the interlocking movement mechanism 27 via the drive control unit 42 to position the focusing lens 15h at the focusing position. (Step S11, corresponding to the positioning control step of the present invention). As a result, the reflex measuring unit 16a and the focusing lens 17d are positioned at the focusing position with respect to the eye E estimated from the subjective examination in conjunction with the positioning of the focusing lens 15h.

When the focusing lens 15h is positioned at the focusing position, the objective measurement control unit 58 controls each part of the motion control unit 30 to shift the subject eye E to the cloud fog vision state and measure the fundus Ef. The projection of the luminous flux of the pattern and the imaging of the reflected light from the fundus of the eye by the image pickup element 12g are executed (step S12, corresponding to the objective measurement control step of the present invention). As a result, the captured image data of the captured image 23 is output from the image pickup device 12g to the eye characteristic calculation unit 36.

FIG. 11 is an explanatory diagram for explaining the captured image 23 (ring image 24) acquired in the remeasurement mode. As shown by reference numeral XIA in FIG. 11, when a disease occurs in the eye E to be inspected in the normal objective measurement mode, the ring image 24 cannot be detected from the captured image 23, or the ring image 24 is omitted from the illustration. The image 24 may not fit inside the scale 100.

On the other hand, in the remeasurement mode, the luminous flux of the measurement pattern projected from the measurement pattern projection optical system 16 onto the fundus Ef by positioning the focusing lens 15h at the focusing position determined by the subjective examination of the eye E to be inspected. The position of the reflex measurement unit 16a and the focusing lens 17d is adjusted via the interlocking movement mechanism 27 so that the focus of the lens is aligned with the fundus Ef. As a result, as shown by the reference numeral XIB in FIG. 11, the ring image 24 can be detected from the captured image 23 with a size suitable for the calculation of the optical refractive power, that is, the ring image 24 can be detected within the range of the scale 100. ..

Returning to FIG. 10, the eye characteristic calculation unit 36 analyzes the captured image data of the captured image 23 input from the image pickup element 12g by a known method, and calculates the optical refractive power of the eye E to be inspected (step S13). The calculation result of the optical power of the eye by the eye characteristic calculation unit 36 is stored in a storage unit (not shown) as a measurement result of the optical power of the eye to be inspected E, and is displayed on the monitor 7 by the display control unit 46.

Further, the calculation result of the optical refractive power of the eye to be inspected E calculated by the eye characteristic calculation unit 36 is used for the subjective examination by another device. If the objective measurement of the optical refractive power of the eye to be inspected E is not possible even in the remeasurement mode, the subjective test by another device is performed based on the corresponding information 60 described above.

[Effect of this embodiment]
As described above, in the present embodiment, when the objective measurement of the optical power of the eye to be inspected E with a disease is impossible, the focusing lens 15h for the eye to be inspected E is performed by performing the subjective examination of the eye to be inspected E. The focusing position (estimated position) of the reflex measuring unit 16a is determined, and the objective measurement of the ocular refractive power is performed with the focusing lens 15h, the reflex measuring unit 16a, and the focusing lens 17d positioned at the determined positions. Re-execute. As a result, the ring image 24 can be detected from the captured image 23 with a size suitable for calculating the optical refractive power. Thereby, even the eye E to be examined with a disease can measure the refractive power of the eye.

[Ophthalmic device of another embodiment 1]
FIG. 12 is a schematic view of the ophthalmic apparatus 1A of another embodiment. The ophthalmic apparatus 1 of the above embodiment includes one measuring head 5 (optical system 8) corresponding to the eye to be inspected E (one eye), whereas the ophthalmic apparatus 1A of another embodiment is a pair of measurements corresponding to both eyes. A head 5 (optical system 8) is provided. The ophthalmic apparatus 1A has basically the same configuration as the ophthalmic apparatus 1 of the above embodiment except that the pair of measuring heads 5R and 5L and the pair of mirrors 82R and 82L provided on the table 80 are provided. be. Therefore, those having the same function or configuration as those of the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 12, the pair of measuring heads 5R and 5L and the pair of mirrors 82R and 82L are provided so as to be rotatable around an axis perpendicular to the upper surface of the table 80, respectively. The pair of measuring heads 5R and 5L have the same configuration as the measuring head 5 of the above embodiment.

The mirror 82R reflects the various light fluxes emitted from the measuring head 5R toward the eye E (right eye) to be inspected, and measures the reflected light of the various light fluxes reflected by the eye E (right eye) to be inspected. It reflects toward the head 5R. Further, the mirror 82L reflects the various light fluxes emitted from the measurement head 5L toward the eye E (left eye) to be inspected, and the reflected light of the various light fluxes reflected by the eye E (left eye) to be inspected. Is reflected toward the measuring head 5L. As a result, the objective measurement (acquisition of the captured image 23) of the optical power of the eye to be inspected E (right eye) is performed by the measurement head 5R, and the optical power of the eye to be inspected E (left eye) is measured by the measurement head 5L. Objective measurement (acquisition of captured image 23) can be performed. As a result, the control device 9 can calculate the refractive power of both eyes.

At this time, the objective measurement of the optical power of the eye to be inspected E (right eye) by the measurement head 5R and the objective measurement of the optical power of the eye to be inspected E (left eye) by the measurement head 5L should be performed at the same time. Can't. Therefore, when objectively measuring the refractive power of the eye to be inspected E (right eye), the optotype projection optical system 15 of the measurement head 5L has only the light beam in the background of the optotype (fixation target, optotype chart 26). Is projected onto the left eye. The background of the optotype is, for example, a black frame surrounding the Randall ring in the case of the optotype chart 26 shown in FIGS. 3 and 9. Conversely, when objectively measuring the refractive power of the eye to be inspected E (left eye), the optotype projection optical system 15 of the measurement head 5R projects only the light flux in the background of the optotype to the right eye. This makes it possible to stabilize the fixative of both eyes.

[Ophthalmic device of another embodiment 2]
FIG. 13 is a schematic view of the optotype projection optical system 15, the measurement pattern projection optical system 16, and the light receiving optical system 17 of the ophthalmic apparatus 1B of the second embodiment. The optometric projection optical system 15 of the ophthalmologic apparatus 1 of the above embodiment emits a light beam of an optotype (fixed optotype, optotype chart 26) from an LED light source 15a, a color correction filter 15b, and a collimator lens 15c, and also emits light. By moving the focusing lens 15h back and forth on the axis O2, the presentation distance of the optotype to the eye E to be inspected is changed.

On the other hand, as shown in FIG. 13, the optotype projection optical system 15 of the ophthalmic apparatus 1B of the second embodiment replaces the LED light source 15a, the color correction filter 15b, the collimator lens 15c, and the focusing lens 15h. , The target luminous flux emitting unit 15S (corresponding to the first luminous flux emitting unit of the present invention) arranged on the optical axis O2 is provided. The ophthalmic apparatus 1B of the second embodiment has basically the same configuration as the ophthalmic apparatus 1 of the above embodiment except that the ophthalmic apparatus 1B of the second embodiment is provided with the target luminous flux emitting unit 15S. Therefore, those having the same function or configuration as those of the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

The target luminous flux emitting unit 15S includes an LED light source 15t, a diffuser plate 15u, a filter 15v such as an ND filter and a color correction filter, a collimating lens 15w, and an optotype unit 15x. The LED light source 15t emits white light toward the diffuser plate 15u. As a result, the white light is diffused by the diffuser plate 15u, subjected to various treatments by the filter 15v, further converted into a parallel light flux by the collimating lens 15w, and then incident on the optotype unit 15x.

As the optotype unit 15x, the chart plate 15d described in the above embodiment, a transmissive LCD capable of displaying an arbitrary optotype, or the like is used. The optotype unit 15x transmits the parallel light flux of the white light incident from the collimating lens 15w, and emits the light flux of the optotype (fixation target, optotype chart 26). As a result, the luminous flux of the optotype is projected onto the fundus Ef as in the above embodiment.

The target luminous flux emitting unit 15S is arranged so as to be able to move forward and backward along the optical axis O2. Therefore, the target luminous flux emitting unit 15S corresponds to "one side" of the present invention. Therefore, in another embodiment 2, the target presentation distance to the eye E to be inspected can be changed by moving the target luminous flux emitting unit 15S forward and backward along the optical axis O2 by the interlocking movement mechanism 27.

The interlocking movement mechanism 27 of the second embodiment moves the target luminous flux emitting unit 15S, the reflex measuring unit 16a, and the focusing lens 17d in parallel with each optical axis O2 to O4 in the parallel direction (Z-axis direction). Let me. Therefore, the second embodiment is basically the same as the above embodiment except that the "focusing lens 15h" of the above embodiment is moved by the interlocking movement mechanism 27 instead of the "target luminous flux emitting unit 15S". The same applies to the above embodiment, and the same effect as that of the above embodiment can be obtained.

[others]
In each of the above embodiments, in the subjective test in the remeasurement mode, the moving process of the focusing lens 15h (the target luminous flux emitting unit 15S) is repeatedly performed 6 times corresponding to the 6 types of target charts 26, but the movement is performed. The number of times the process is repeated (the number of types of the optotype chart 26) is not particularly limited. For example, when it is assumed that the visual acuity value of the eye E to be inspected is high, the movement process is performed with the visual acuity chart 26 having the visual acuity value “1.0” or “0.8” presented to the eye E to be inspected from the beginning. The movement process may be completed once or twice.

In each of the above embodiments, the ring-shaped measurement pattern is projected from the measurement pattern projection optical system 16 to the fundus Ef, but the measurement pattern projection optical system 16 projects the point-shaped measurement pattern from the measurement pattern projection optical system 16 to the fundus Ef. It may be projected and the ring-shaped reflected light from the fundus of the fundus may be received by the light receiving optical system 17. That is, the shape of the measurement pattern is not particularly limited as long as the ring-shaped fundus reflected light can be received by the light receiving optical system 17.

In each of the above embodiments, the case where the optical axes O2 to O4 are parallel to each other has been described, but the optical axes O2 to O4 may not be parallel to each other. In this case, the interlocking movement mechanism 27 is interlocked with a movement mechanism (motor drive mechanism or the like) that individually moves the focusing lens 15h, the reflex measuring unit 16a, and the focusing lens 17d, and each movement mechanism is driven in conjunction with each other. It is equipped with a drive control unit (processor, etc.). As a result, even if the optical axes O2 to O4 are non-parallel, the focusing lens 15h, the reflex measuring unit 16a, and the focusing lens 17d are interlocked with the same amount of movement in the direction toward or away from the eye E to be inspected. Can be moved.

In each of the above embodiments, the control device 9 is incorporated in the ophthalmic devices 1, 1A, 1B, but the control device 9 is a computing device (personal computer, mobile terminal, etc.) separate from the ophthalmic devices 1, 1A, 1B. ) May be incorporated. That is, the processor of the arithmetic unit or the like may function as the control device 9.

In each of the above embodiments, the ophthalmic devices 1, 1A and 1B for measuring the optical power as an eye characteristic of the eye E to be inspected have been described as an example, but the ring image 24 included in various captured images of the eye E to be inspected is an image. The present invention can also be applied to an ophthalmic apparatus that analyzes and measures various eye characteristics other than the optical power of the eye E to be inspected.

1,1A, 1B ... Ophthalmic equipment,
7 ... Monitor,
8 ... Optical system,
9 ... Control device,
12 ... Observation optical system,
12g ... Image sensor,
15 ... Objective projection optical system,
15d ... Chart board,
15h ... Focusing lens,
15S ... Luminous flux emitting part,
16 ... Measurement pattern projection optical system,
16a ... Ref measurement unit,
17 ... Light receiving optical system,
17d ... Focusing lens,
22 ... Observation image,
23 ... Captured image,
24 ... Ring image,
25 ... Operation screen,
26 ... optotype chart,
27 ... Interlocking movement mechanism,
30 ... Motion control unit,
36 ... Eye characteristic calculation unit,
42 ... Drive control unit,
48 ... Chart plate drive control unit,
52 ... Awareness inspection control unit,
52a ... Emission control unit,
52b ... Movement control unit,
52c ... Stop operation reception unit,
52d ... Stop control unit,
52e ... Repeat control unit,
54 ... Focusing position determination unit,
56 ... Positioning control unit,
58 ... Objective measurement control unit

Claims (12)

It is an optotype projection optical system that has a first optical axis and projects a luminous flux of an optotype on the fundus of the eye to be inspected, and has a first luminous flux emitting portion that emits the luminous flux of the optotype and a luminous flux of the optotype. An optotype projection optical system having a first lens through which the light flux is transmitted, and one of the first luminous flux emitting portion and the first lens being arranged so as to be able to advance and retreat along the first optical axis.
A measurement pattern projection optical system having a second optical axis and projecting a light flux of a measurement pattern onto the fundus of the eye, and a second light flux emitting unit that emits a light flux of the measurement pattern is the second optical axis. The pattern projection optical system for measurement, which is arranged freely along the
A light receiving optical system having a third optical axis and receiving the fundus reflected light of the light beam of the measurement pattern projected onto the fundus from the measurement pattern projection optical system, and along the third optical axis. A light receiving optical system having a second lens arranged so as to be able to move forward and backward,
The movement of the one along the first optical axis, the movement of the second luminous flux emitting portion along the second optical axis, and the movement of the second lens along the third optical axis are performed in conjunction with each other. Interlocking movement mechanism and
An eye characteristic calculation unit that analyzes a ring image based on the fundus reflected light received by the light receiving optical system and calculates the eye characteristics of the eye to be inspected.
A movement control unit that controls the interlocking movement mechanism and executes a movement process for moving one of them along the first optical axis.
A stop operation receiving unit that accepts a stop operation for stopping the movement process at a position where the eye to be inspected subjectively recognizes the optotype while the movement control unit is executing the movement process.
A stop control unit that controls the interlocking movement mechanism to stop the movement process when the stop operation reception unit receives the stop operation.
Based on the one stop position stopped on the first optical axis by the stop control unit, the focus position determining unit determines the one focus position for focusing the luminous flux of the optotype on the fundus. ,
A positioning control unit that controls the interlocking movement mechanism to position one of them at the focusing position determined by the focusing position determining unit.
When one of the above is moved to the in-focus position, the projection of the luminous flux of the measurement pattern onto the eye to be inspected by the measurement pattern projection optical system and the reception of the fundus reflected light by the light receiving optical system. An objective measurement control unit that executes objective measurement including the calculation of the eye characteristics by the eye characteristic calculation unit, and the objective measurement control unit.
An ophthalmic device equipped with. The first luminous flux emitting unit can selectively emit the luminous flux of a plurality of types of the visual acuity targets having different visual acuity values.
An emission control unit that controls the first luminous flux emission unit to emit the luminous flux of the optotype in order according to the type of the optotype.
Every time the light flux of the target corresponding to the new visual acuity value is emitted from the first light flux emitting unit, the movement control unit, the stop operation reception unit, and the stop control unit are repeatedly operated. When,
Equipped with
The ophthalmic apparatus according to claim 1, wherein the in-focus position determining unit determines the in-focus position based on the stop position for each type of the optotype. The second aspect of claim 2, wherein the in-focus position determining unit determines the stop position corresponding to the optotype having the highest visual acuity value among the stop positions for each type of optotype as the in-focus position. Ophthalmology equipment. The in-focus position determination unit calculates an estimated stop position, which is the stop position corresponding to the visual acuity value of the visual acuity value equal to or higher than a predetermined reference value, based on the stop position for each type of the optotype. The ophthalmic apparatus according to claim 2, wherein the estimated stop position is determined as the in-focus position. The ophthalmic apparatus according to claim 4, wherein the in-focus position determining unit generates correspondence information indicating a correspondence relationship between the type of the optotype and the stop position, and calculates the estimated stop position based on the correspondence information. The ophthalmology according to any one of claims 2 to 5, wherein the emission control unit controls the first light flux emission unit to emit the light flux of the target in order from the target having the lowest visual acuity value. Device. The ophthalmologic device according to claim 6, wherein the movement control unit controls the interlocking movement mechanism to move one of them along the traveling direction of the luminous flux of the target. When the movement control unit controls the interlocking movement mechanism to execute the first movement process, one of the movement control units is moved along the traveling direction from the initial position where the eye to be inspected is fogged, and the movement is described. The ophthalmic apparatus according to claim 7, wherein when the interlocking movement mechanism is controlled to execute the movement process from the second time onward, one of the movement processes is moved from the previous stop position along the traveling direction. The ophthalmic apparatus according to any one of claims 1 to 8, wherein the second light flux emitting unit emits a ring-shaped light flux of the measurement pattern. The ophthalmology according to any one of claims 1 to 9, wherein the pair of optotype projection optical systems corresponding to both eyes, the pair of measurement pattern projection optical systems, and the pair of light receiving optical systems are provided. Device. The ophthalmic apparatus according to any one of claims 1 to 10, wherein the first optical axis, the second optical axis, and the third optical axis are parallel to each other. It is an optotype projection optical system that has a first optical axis and projects a luminous flux of an optotype on the fundus of the eye to be inspected, and has a first luminous flux emitting portion that emits the luminous flux of the optotype and a luminous flux of the optotype. An optotype projection optical system having a first lens through which the light flux is transmitted, and one of the first luminous flux emitting portion and the first lens being arranged so as to be able to advance and retreat along the first optical axis.
A measurement pattern projection optical system having a second optical axis and projecting a light flux of a measurement pattern onto the fundus of the eye, and a second light flux emitting unit that emits a light flux of the measurement pattern is the second optical axis. The pattern projection optical system for measurement, which is arranged freely along the
A light receiving optical system having a third optical axis and receiving the fundus reflected light of the light beam of the measurement pattern projected onto the fundus from the measurement pattern projection optical system, and along the third optical axis. A light receiving optical system having a second lens arranged so as to be able to move forward and backward,
The movement of the one along the first optical axis, the movement of the second luminous flux emitting portion along the second optical axis, and the movement of the second lens along the third optical axis are performed in conjunction with each other. Interlocking movement mechanism and
An eye characteristic calculation unit that analyzes a ring image based on the fundus reflected light received by the light receiving optical system and calculates the eye characteristics of the eye to be inspected.
In the method of operating an ophthalmic appliance equipped with
A movement control step in which the movement control unit controls the interlocking movement mechanism to execute a movement process of moving one of them along the first optical axis.
A stop operation reception step of accepting a stop operation in which the stop operation reception unit stops the movement process at a position where the eye to be inspected subjectively recognizes the target while the movement control unit is executing the movement process.
A stop control step in which the stop control unit controls the interlocking movement mechanism to stop the movement process when the stop operation is received by the stop operation reception unit.
The focusing position determining unit determines the focusing position of the one that focuses the luminous flux of the optotype to the fundus based on the one stopping position stopped on the first optical axis by the stop control unit. Focusing position determination process and
A positioning control step in which the positioning control unit controls the interlocking movement mechanism to position one of them at the in-focus position determined by the in-focus position determining unit.
When one of the objective measurement control steps is moved to the in-focus position, the measurement pattern projection optical system projects the light beam of the measurement pattern onto the eye to be inspected, and the light receiving optical system. An objective measurement control step for executing an objective measurement including the light received from the fundus of the eye and the calculation of the eye characteristics by the eye characteristic calculation unit.
How to operate an ophthalmic appliance with.

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