Ophthalmic device and method for examining subject's eye

Abstract

To provide an ophthalmologic apparatus capable of measuring eye characteristics of subject's left / right eyes under a same condition, with both eyes opened.SOLUTION: An ophthalmologic apparatus simultaneously performs measurement of axial length of a subject's left eye EL using an OCT optical system 38 of a left eye measurement optical system 25L and measurement of axial length of a subject's right eye ER using an OCT optical system 38 of a right eye measurement optical system 25R, simultaneously performs measurement of a corneal shape of the subject's left eye FL using a keratometry system 34 of the left eye measurement optical system 25L and measurement of a corneal shape of the subject's right eye ER using a keratometry system 34 of the right eye measurement optical system 25R, and simultaneously performs measurement of refractive characteristics of the subject's left eye EL using a refractometry optical system of the left eye measurement optical system 25L and measurement of refractive characteristic of the subject's right eye ER using a refractometry optical system of the right eye measurement optical system 25R.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to an ophthalmic apparatus and a method for examining an eye to be examined. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known an ophthalmologic apparatus that simultaneously measures the axial length of a subject's eye, the corneal shape of the subject's eye, and the refractive characteristics of the subject's eye (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-121114 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, humans view objects with both the left and right eyes in daily life. Therefore, when the eye characteristics of the test eyes, such as the axial length, are measured one eye at a time, the measurement is performed in a state where the state of accommodation and convergence of the test eyes is different from when viewing an object with both eyes. In addition, when the eye characteristics of the left and right test eyes are measured at different times, the conditions such as the measurement environment are different. Therefore, a problem occurs in that it is difficult to measure the appropriate eye characteristics.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide an ophthalmic apparatus and an examination method for examinee's eyes that can measure the ocular characteristics of the left and right examinee's eyes under the same conditions with both eyes open. [Means for solving the problem]

[0006] In order to achieve the above object, the ophthalmologic apparatus of the present invention includes a first left eye measuring optical system used to measure dimensional information in the front-rear direction of a left eye to be examined, a second left eye measuring optical system used to measure the corneal shape of the left eye to be examined, a third left eye measuring optical system used to measure the refractive characteristics of the left eye to be examined, a first right eye measuring optical system used to measure dimensional information in the front-rear direction of a right eye to be examined, a second right eye measuring optical system used to measure the corneal shape of the right eye to be examined, a third right eye measuring optical system used to measure the refractive characteristics of the right eye to be examined, and a control unit that controls each of the optical systems and processes the measurement data obtained. The control unit simultaneously executes a measurement using the first left eye measuring optical system and a measurement using the first right eye measuring optical system, simultaneously executes a measurement using the second left eye measuring optical system and a measurement using the second right eye measuring optical system, and simultaneously executes a measurement using the third left eye measuring optical system and a measurement using the third right eye measuring optical system. The measurement data obtained using the third left eye measuring optical system is also processed by the control unit. Validity using measurement data obtained using the first left eye measuring optical system and / or measurement data obtained using the second left eye measuring optical system. Judgment and measurement data obtained using the third right eye measurement optical system. Validity based on measurement data obtained using the first right eye measuring optical system and / or measurement data obtained using the second right eye measuring optical system. Judgment do.

[0007] The method for inspecting an eye of the present invention is executed by an ophthalmic apparatus including a first left-eye measuring optical system used for measuring dimensional information of the left eye in the front-rear direction, a second left-eye measuring optical system used for measuring the corneal shape of the left eye, a third left-eye measuring optical system used for measuring the refractive characteristics of the left eye, a first right-eye measuring optical system used for measuring dimensional information of the right eye in the front-rear direction, a second right-eye measuring optical system used for measuring the corneal shape of the right eye, a third right-eye measuring optical system used for measuring the refractive characteristics of the right eye, and a control unit for controlling each of the optical systems and processing the obtained measurement data. The method includes a first measurement step for simultaneously performing a measurement using the first left-eye measuring optical system and a measurement using the first right-eye measuring optical system, a second measurement step for simultaneously performing a measurement using the second left-eye measuring optical system and a measurement using the second right-eye measuring optical system, and a third measurement step for simultaneously performing a measurement using the third left-eye measuring optical system and a measurement using the third right-eye measuring optical system. Furthermore, measurement data obtained using the third left eye measurement optical system Validity using measurement data obtained using the first left eye measuring optical system and / or measurement data obtained using the second left eye measuring optical system. Judgment and measurement data obtained using the third right eye measurement optical system. Validity based on measurement data obtained using the first right eye measuring optical system and / or measurement data obtained using the second right eye measuring optical system. Judgment do. Effect of the Invention

[0008] In the ophthalmologic apparatus and the method for examining the subject's eyes thus configured, the ocular characteristics of the left and right eyes to be examined can be measured under the same conditions with both eyes open. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing the appearance of an ophthalmic apparatus according to a first embodiment. [Diagram 2] FIG. 2 is an explanatory diagram illustrating a schematic configuration of a measurement unit of the ophthalmologic apparatus of the first embodiment. [Diagram 3] 1A and 1B are explanatory diagrams showing a schematic configuration of the measurement optical system of the ophthalmic apparatus of Example 1, in which (a) shows a state in which both eyes are looking at infinity, and (b) shows a state in which both eyes are looking at a predetermined position. [Figure 4] 2 is a block diagram showing the configuration of a control system of the ophthalmic apparatus of the first embodiment. FIG. [Diagram 5] FIG. 2 is an explanatory diagram showing the configuration of a measurement optical system according to the first embodiment. [Figure 6] FIG. 2 is an explanatory diagram illustrating a configuration of an OCT unit according to the first embodiment. [Figure 7] 4 is a flowchart showing a procedure for measuring eye characteristics executed in the ophthalmologic apparatus of the first embodiment. [Figure 8] 3 is an explanatory diagram of an eye position detection method executed in the ophthalmologic apparatus of the first embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an ophthalmic apparatus and an examination method for an eye to be examined according to the present invention will be described with reference to a first embodiment shown in the drawings.

[0011] The ophthalmic apparatus 10 of the first embodiment is an ophthalmic apparatus of a binocular open type capable of measuring the ocular characteristics of the subject's eyes simultaneously with the subject keeping both eyes open.

[0012] As shown in Fig. 1, the ophthalmologic apparatus 10 of the first embodiment includes a base 11 installed on a floor surface, an eye examination table 12, a support 13, an arm 14, and a measurement unit 20. The ophthalmologic apparatus 10 also includes, as input / output devices, an examiner's controller 19a such as a mobile terminal, an examinee's controller 19b (see Fig. 6), and a display device 19c such as a liquid crystal display. In the first embodiment, the display device 19c is provided in the examiner's controller 19a.

[0013] In the ophthalmologic apparatus 10, the ocular characteristics of the subject's eye are measured while the subject faces the ophthalmological examination table 12 and places his / her forehead in contact with a forehead support 15 provided on the measurement unit 20. In the following, the left-right direction as viewed from the subject is defined as the X direction, the up-down direction (vertical direction) as the Y direction, and the direction perpendicular to the X and Y directions (depth direction) as the Z direction.

[0014] The optometry table 12 is supported by a base 11, and its height position is adjustable. The support pillar 13 stands upright in the Y direction from the rear end of the optometry table 12, and has an arm 14 attached to its upper part. The arm 14 supports the measurement unit 20 by suspending it above the optometry table 12, and extends from the support pillar 13 along the Z direction. The arm 14 is attached to the support pillar 13 so as to be movable up and down.

[0015] A control box 30a containing a control unit 30 is provided below the optometry table 12. The control unit 30, as described below, comprehensively controls the operations of each unit of the ophthalmologic apparatus 10. The control unit 30 receives power from a commercial power source (not shown) via a power cable 30b.

[0016] The measurement unit 20 is controlled by the control unit 30, and simultaneously measures the dimensional information in the front-back direction of the subject's eye, which is the eye characteristics of the subject's eye, the corneal shape of the subject's eye, and the refractive characteristics of the subject's eye, for both the left and right eyes. The measurement unit 20 may perform any subjective test or any objective measurement other than the above. In the subjective test, a visual target or the like is presented to the subject, and the test result is obtained based on the subject's response to the presented visual target or the like. The subjective test includes subjective refraction measurements such as distance test, near test, contrast test, and glare test, visual field test, astigmatism axis test, and astigmatism degree test. In the objective measurement, light is irradiated to the subject's eye, and information about the subject's eye (eye characteristics) is measured based on the detection result of the return light. The objective measurement includes a measurement for obtaining the eye characteristics of the subject's eye and photography for obtaining an image of the subject's eye. Furthermore, objective measurements include intraocular pressure measurement, fundus photography, tomography using optical coherence tomography (OCT photography), and measurements using OCT.

[0017] The measurement unit 20 is also connected to the control unit 30 via a control / power cable 30c (see FIG. 2), and power is supplied to the measurement unit 20 via the control unit 30. Information is also exchanged between the measurement unit 20 and the control unit 30 via the control / power cable 30c.

[0018] As shown in Figure 2, the measurement unit 20 includes a mounting base portion 20a, a left drive mechanism 21L and a right drive mechanism 21R provided on the mounting base portion 20a, a left eye measurement head 22L supported by the left drive mechanism 21L, and a right eye measurement head 22R supported by the right drive mechanism 21R.

[0019] The left eye measurement head 22L and the right eye measurement head 22R are provided in pairs to correspond to the left and right test eyes EL, ER (see FIG. 2), respectively, and are configured to be plane-symmetrical with respect to a vertical plane located midway between them in the X direction. Also, the configuration of each drive part of the left drive mechanism 21L supporting the left eye measurement head 22L and the configuration of each drive part of the right drive mechanism 21R supporting the right eye measurement head 22R are configured to be plane-symmetrical with respect to a vertical plane located midway between them in the X direction.

[0020] The left drive mechanism 21L has a left vertical drive unit 23a, a left horizontal drive unit 23b, and a left rotation drive unit 23c, and is suspended from one end of the mounting base unit 20a. The drive units 23a, 23b, and 23c are arranged between the mounting base unit 20a and the left eye measurement head 22L in the order of the left vertical drive unit 23a, the left horizontal drive unit 23b, and the left rotation drive unit 23c from the upper side.

[0021] The right drive mechanism 21R has a right vertical drive unit 24a, a right horizontal drive unit 24b, and a right rotation drive unit 24c, and is suspended from the other end of the mounting base unit 20a. The drive units 24a, 24b, and 24c are arranged between the mounting base unit 20a and the right eye measurement head 22R in the order of the right vertical drive unit 24a, the right horizontal drive unit 24b, and the right rotation drive unit 24c from the upper side.

[0022] Each of the drive units 23a, 23b, 23c, 24a, 24b, and 24c has an actuator such as a pulse motor that generates a drive force, and a transmission mechanism such as a plurality of gear sets or a rack and pinion that transmits the drive force.

[0023] The left vertical drive unit 23a moves the left eye measurement head 22L in the Y direction (vertical direction) relative to the mounting base part 20a, and the right vertical drive unit 24a moves the right eye measurement head 22R in the Y direction (vertical direction) relative to the mounting base part 20a. The left horizontal drive unit 23b moves the left eye measurement head 22L in the X direction and Z direction (horizontal direction) relative to the mounting base part 20a, and the right horizontal drive unit 24b moves the right eye measurement head 22R in the X direction and Z direction (horizontal direction) relative to the mounting base part 20a.

[0024] The left rotation drive unit 23c rotates the left eye measuring head 22L around the ocular rotation axis OL (see FIG. 2) of the left subject eye EL to change the orientation of the left eye measuring head 22L relative to the left subject eye EL. The right rotation drive unit 24c rotates the right eye measuring head 22R around the ocular rotation axis OR (see FIG. 2) of the right subject eye ER to change the orientation of the right eye measuring head 22R relative to the right subject eye ER.

[0025] The left horizontal drive unit 23b and the right horizontal drive unit 24b may be provided with a combination of an actuator and a transmission mechanism for each of the X and Z directions. In this case, the configuration can be simplified and the control of the horizontal movement can be facilitated. The left rotation drive unit 23c and the right rotation drive unit 24c move the transmission mechanism that receives the driving force from the actuator along an arc-shaped guide groove with the eyeball rotation axis OL, OR as the center position. As a result, the left eye measurement head 22L and the right eye measurement head 22R are rotated around the eyeball rotation axis OL of the left eye EL and the eyeball rotation axis OR of the right eye ER, respectively. The left rotation drive unit 23c and the right rotation drive unit 24c may be mounted so that the left eye measurement head 22L and the right eye measurement head 22R can be rotated around their own rotation axis.

[0026] As shown in Fig. 2 and Fig. 3(a) and (b), the left eye measurement head 22L has a left housing 22a (a housing for the left eye) fixed to the left rotation drive unit 23c, a left eye measurement optical system 25L accommodated in the left housing 22a, an objective lens 26L, and a left eye deflection member 27L provided on the outer surface of the left housing 22a. Furthermore, two cameras (stereo cameras) 39A and 39B are provided in the left housing 22a close to the left eye deflection member 27L, in front and behind (Z direction) with the optical axis of the left eye measurement optical system 25L in between. In the left eye measurement head 22L, the light emitted from the left eye measurement optical system 25L through the objective lens 26L is deflected by the left eye deflection member 27L and irradiated to the left test eye EL, thereby measuring the eye characteristics of the left test eye EL. In addition, each of the cameras 39A and 39B acquires an anterior eye image of the left test eye EL (more specifically, an anterior eye image photographed from an oblique lateral direction intersecting the visual axis) that is bent and incident via the left eye deflection member 27L.

[0027] As shown in Fig. 2 and Fig. 3(a) and (b), the right eye measurement head 22R has a right housing 22b (a housing for the right eye) fixed to the right rotation drive unit 24c, a right eye measurement optical system 25R housed in the right housing 22b, an objective lens 26R, and a right eye deflection member 27R provided on the outer surface of the right housing 22b. In addition, two cameras (stereo cameras) 39A and 39B are provided in the right housing 22b close to the right eye deflection member 27R, in front and behind (Z direction) with the optical axis of the right eye measurement optical system 25R in between. In the right eye measurement head 22R, the outgoing light emitted from the right eye measurement optical system 25R through the objective lens 26R is bent by the right eye deflection member 27R and irradiated to the right eye ER to measure the eye characteristics of the right eye ER. In addition, each of the cameras 39A and 39B acquires an anterior eye image of the right test eye ER that is bent and incident via the right eye deflection member 27R (more specifically, an anterior eye image captured from an oblique lateral direction intersecting the visual axis).

[0028] In the ophthalmologic apparatus 10 of the first embodiment, the cameras 39A and 39B photograph the test eyes EL and ER from different directions substantially simultaneously, so that two different anterior eye images can be obtained for each test eye EL and ER. The positions of the cameras 39A and 39B are not limited to front and rear across the optical axis, and may be arranged above and below the optical axis. The number of cameras is not limited to two, and three or more cameras may be provided, for example, four cameras are provided front and rear and four cameras are provided above and below, and in this case, more anterior eye images can be obtained. The cameras 39A and 39B may be provided outside the housings 22a and 22b, and may be provided at desired positions depending on the size and design of each part.

[0029] Here, "substantially simultaneously" means that a difference in the timing of photographing is allowed to the extent that eye movement can be ignored when photographing with the multiple cameras 39A and 39B. By photographing the anterior segments of the examinee's eyes EL and ER from different directions substantially simultaneously with the multiple cameras 39A and 39B, it becomes possible to obtain multiple photographed images of the examinee's eyes EL and ER when they are in the same position (direction).

[0030] Furthermore, the ophthalmologic apparatus 10 of the first embodiment adjusts the positions of the measurement heads 22L, 22R to correspond to the positions of the deflection members 27R, 27L to the left and right test eyes EL, ER, respectively. This allows the ophthalmologic apparatus 10 of the first embodiment to simultaneously obtain the upper (ocular characteristics) of the left and right test eyes EL, ER when the subject opens the left and right test eyes EL, ER (binocular vision state).

[0031] In addition, the measurement heads 22L, 22R simultaneously change their rotational postures symmetrically about the ocular rotation axes OL, OR of the corresponding left and right test eyes EL, ER. As a result, the orientations of the left eye measurement axis LL of the left eye measurement optical system 25L and the right eye measurement axis LR of the right eye measurement optical system 25R are changed according to the visual axis (gaze direction) that changes due to divergence and convergence when the left and right test eyes EL, ER are in a binocular vision state.

[0032] 3(a) shows a state in which the rotational postures of the measurement heads 22L and 22R are adjusted so that the left eye measurement axis LL from the left test eye EL to the left eye deflection member 27L and the right eye measurement axis LR from the right test eye ER to the right eye deflection member 27R are parallel to each other. In the state shown in FIG. 3(a), the visual axis can be the same as when the subject is looking at infinity with binocular vision.

[0033] 3(b) shows a state in which the rotational postures of the measurement heads 22L and 22R are adjusted so that the left eye measurement axis LL from the left test eye EL to the left eye deflection member 27L and the right eye measurement axis LR from the right test eye ER to the right eye deflection member 27R are extended toward the predetermined position P. In the state shown in FIG. 3(b), the visual axes can be made similar to the state in which the subject is viewing the predetermined position P with binocular vision.

[0034] An example of the configuration of the left eye measuring optical system 25L and the right eye measuring optical system 25R will be described below with reference to Fig. 4. Note that since the configuration of the left eye measuring optical system 25L and the configuration of the right eye measuring optical system 25R are the same, only the left eye measuring optical system 25L will be described below.

[0035] The left eye measurement optical system 25L of the first embodiment includes an anterior eye observation system 31, a Z alignment system 32, an XY alignment system 33, a keratoconstriction measurement system 34, a reflex measurement projection system 35, a reflex measurement light receiving system 36, a fixation projection system 37, and an OCT optical system 38. Here, the anterior eye observation system 31, the XY alignment system 33, the keratoconstriction measurement system 34, the reflex measurement projection system 35, the reflex measurement light receiving system 36, the fixation projection system 37, and the OCT optical system 38 have a common left eye measurement axis LL. The reflex measurement projection system 35 and the reflex measurement light receiving system 36 form a reflex measurement optical system. In the right eye measurement optical system 25R, the anterior segment observation system 31, the XY alignment system 33, the keratometry measurement system 34, the reflex measurement projection system 35, the reflex measurement light receiving system 36, the fixation projection system 37, and the OCT optical system 38 have a common right eye measurement axis LR.

[0036] (Anterior segment observation system 31) The anterior eye observation system 31 is an optical system that captures a moving image of the anterior eye of the left eye EL. The anterior eye observation system 31 has an anterior eye illumination light source 31a for capturing anterior eye images. The anterior eye illumination light source 31a irradiates illumination light (e.g., infrared light) onto the anterior eye of the left eye EL. The light reflected by the anterior eye of the left eye EL passes through the objective lens 26L, the dichroic mirror 31b, the hole formed in the aperture (telecentric aperture) 31c, the half mirror 33c, the relay lens 31d, the relay lens 31e, and the dichroic mirror 36f. The light that has passed through the dichroic mirror 36f is imaged on the imaging surface of the imaging element 31g by the imaging lens 31f. The imaging element 31g (imaging surface) is set to a pupil conjugate position by the above optical system that passes through the anterior eye observation system 31. The imaging element 31g captures images at a predetermined rate and outputs a video signal to the control unit 30. The control unit 30 causes the display screen 19d of the display device 19c to display a left anterior eye image EL' based on the video signal. The left anterior eye image EL' is, for example, an infrared moving image.

[0037] (Z alignment system 32) The Z alignment system 32 is an optical system used for alignment of the left eye measurement head 22L in the optical axis direction (front-back direction, Z direction) of the anterior eye observation system 31. The Z alignment system 32 projects light (infrared light) emitted from the Z alignment light source 32a onto the cornea Cr of the left eye EL. The light from the Z alignment light source 32a is reflected by the cornea Cr of the left eye EL and is imaged on the light receiving surface of the line sensor 32c by the imaging lens 32b. In the Z alignment system 32, when the position of the corneal apex changes in the optical axis direction of the anterior eye observation system 31, the projection position of the light on the light receiving surface of the line sensor 32c is changed according to the change. The control unit 30 obtains the position of the corneal apex of the left eye EL based on the projection position of the light on the sensor surface of the line sensor 32c, and controls the left horizontal drive unit 23b based on the position to perform Z alignment.

[0038] (XY alignment system 33) The XY alignment system 33 is an optical system used for alignment of the left eye measurement head 22L in a direction perpendicular to the optical axis of the anterior eye observation system 31 (left-right direction (X direction) and up-down direction (Y direction)). The XY alignment system 33 projects light (infrared light) emitted from the XY alignment light source 33a onto the cornea Cr of the left eye EL. The light from the XY alignment light source 33a passes through a collimator lens 33b, is reflected by a half mirror 33c, and is projected through the anterior eye observation system 31. That is, the XY alignment system 33 is branched off from the optical path of the anterior eye observation system 31 by the half mirror 33c, and shares the objective lens 26L, the dichroic mirror 31b, and the diaphragm 31c with the anterior eye observation system 31. The light reflected by the cornea Cr of the eye E is guided to the image sensor 31g through the anterior eye observation system 31.

[0039] The XY alignment system 33 forms a bright spot image Br, which is an image based on the reflected light. The bright spot image Br is acquired by the imaging element 31g together with the left anterior eye image EL'. The control unit 30 causes the left anterior eye image EL' including the bright spot image Br and the alignment mark AL to be displayed on the display screen 19d of the display device 19c. Furthermore, the control unit 30 controls the left vertical drive unit 23a and the left horizontal drive unit 23b so as to eliminate the displacement of the bright spot image Br relative to the alignment mark AL, and automatically performs XY alignment. The examiner can manually perform XY alignment by moving the left eye measurement head 22L so as to guide the bright spot image Br into the alignment mark AL.

[0040] (Keratoassay System 34) The keratometric measurement system 34 is an optical system used to measure the shape of the cornea Cr of the left test eye EL, and constitutes a keratometer mechanism. The "corneal shape" includes at least one of the corneal radius of curvature, corneal refractive power, corneal astigmatism, and corneal astigmatism axis angle. Here, the keratometric measurement system 34 of the left eye measuring optical system 25L corresponds to the second left eye measuring optical system, and the keratometric measurement system 34 of the right eye measuring optical system 25R corresponds to the second right eye measuring optical system.

[0041] The kerato measurement system 34 includes a kerato plate 34a and a kerato ring light source 34b. The kerato plate 34a is disposed between the objective lens 26L and the left eye EL, and the kerato ring light source 34b is disposed between the kerato plate 34a and the objective lens 26L. The kerato measurement system 34 projects a ring-shaped light beam (light beam for measuring the corneal shape) onto the cornea Cr of the left eye EL by illuminating the kerato plate 34a with light from the kerato ring light source 34b. That is, the kerato plate 34a and the kerato ring light source 34b form a kerato projection system that projects a ring-shaped light beam onto the cornea Cr of the left eye EL.

[0042] The reflected light (keratinizing image: pattern image) from the cornea Cr of the left eye EL is detected by the anterior eye observation system 31 and acquired by the imaging element 31g together with the left anterior eye image EL'. The control unit 30 performs a known calculation based on the keratinizing image to calculate corneal shape parameters that represent the shape of the cornea Cr. Furthermore, the control unit 30 determines the corneal shape of the left eye EL based on the image obtained by the anterior eye observation system 31.

[0043] (Reflective measurement optical system) The refraction measurement optical system, which is composed of the refraction measurement projection system 35 and the refraction measurement light receiving system 36, is an optical system used to measure the refractive characteristics of the left test eye EL, and constitutes an autorefractometer mechanism. The "refractive characteristics" include at least one of the refractive power value, the spherical power, the cylindrical power, and the cylindrical axis angle. Here, the refraction measurement optical system (the refraction measurement projection system 35 and the refraction measurement light receiving system 36) of the left eye measurement optical system 25L corresponds to the third left eye measurement optical system, and the refraction measurement optical system (the refraction measurement projection system 35 and the refraction measurement light receiving system 36) of the right eye measurement optical system 25R corresponds to the third right eye measurement optical system.

[0044] The reflex measurement projection system 35 has a reflex measurement light source 35a, which is a high-brightness SLD (Super Luminescent Diode) light source, and projects a measurement light beam (light beam for measuring refraction characteristics) onto the fundus Ef of the left eye EL. The reflex measurement light source 35a is movable in the optical axis direction and is disposed at a fundus conjugate position. The light output from the reflex measurement light source 35a passes through a relay lens 35b, enters the conical surface of the conical prism 35c, is deflected, and is emitted from the bottom surface of the conical prism 35c. The light from the bottom surface of the conical prism 35c passes through a ring-shaped light-transmitting portion of the ring aperture 35d to be made into a ring-shaped light beam, is reflected by a reflecting surface around the hole of the hole prism 35e, passes through the rotary prism 35f, and is reflected by a filter 35g. The filter 35g is an optical element that separates the optical path of the reflex measurement optical system from the optical path of the OCT optical system 38 by performing wavelength separation. The rotary prism 35f is used to average the light amount distribution of the ring-shaped light beam for the blood vessels and diseased parts of the fundus Ef, reduce speckle noise caused by the light source, etc. The reflex measurement projection system 35 shares the dichroic mirror 31b and the objective lens 26L with the anterior segment observation system 31, and reflects the light reflected by the filter 35g by the dichroic mirror 31b, passes through the objective lens 26L, and projects it onto the left test eye EL.

[0045] The reflex measurement projection system 35 is provided in an optical path branched by an aperture prism 35e provided in the optical path of the reflex measurement light receiving system 36. The aperture formed in the aperture prism 35e is disposed at a pupil conjugate position.

[0046] The reflex measurement light receiving system 36 receives a measurement light beam (light beam for measuring refraction characteristics, here a ring-shaped light beam) reflected from the fundus Ef of the left eye EL. The reflex measurement light receiving system 36 shares the dichroic mirror 31b and the objective lens 26L with the anterior segment observation system 31, and the reflected light from the fundus Ef (hereinafter referred to as "fundus return light") passes through the objective lens 26L and is reflected by the dichroic mirror 31b and the filter 35g. The reflex measurement light receiving system 36 also shares the rotary prism 35f and the aperture prism 35e with the reflex measurement projection system 35, and the fundus return light passes through the rotary prism 35f and passes through the hole of the aperture prism 35e. Furthermore, the fundus return light passes through the relay lens 36a, is reflected by the reflecting mirror 36b, and passes through the relay lens 36c and the focusing lens 36d. The focusing lens 36d is movable along the optical axis of the reflex measurement light-receiving system 36. The light passing through the focusing lens 36d is reflected by the reflecting mirror 36e, then by the dichroic mirror 36f, and is imaged on the imaging surface of the image sensor 31g by the imaging lens 31f. That is, the reflex measurement light-receiving system 36 shares the imaging lens 31f and the image sensor 31g with the anterior eye observation system 31. In the optical system passing through the reflex measurement light-receiving system 36, the imaging surface of the image sensor 31g is disposed at a fundus conjugate position. The control unit 30 calculates the refractive characteristics of the left test eye EL by performing a known calculation based on the output from the image sensor 31g.

[0047] (Fixation projection system 37) The fixation projection system 37 is an optical system that presents a fixation target to the left test eye EL and is used for fixation of the left test eye EL. Here, the fixation projection system 37 of the left eye measurement optical system 25L corresponds to the left eye fixation optical system, and the fixation projection system 37 of the right eye measurement optical system 25R corresponds to the right eye fixation optical system.

[0048] The fixation projection system 37 includes a liquid crystal panel 37a and a relay lens 37b, and is coupled to the optical path of the OCT optical system 38 by a dichroic mirror 38f. The fixation projection system 37 displays a pattern representing a fixation target on the liquid crystal panel 37a under the control of the control unit 30, and transmits the light through the relay lens 37b and the dichroic mirror 38f to proceed to the optical path of the OCT optical system 38. At least one of the liquid crystal panel 37a and the relay lens 37b is movable in the optical axis direction. The light transmitted through the dichroic mirror 38f passes through the relay lens 38g, is reflected by the reflecting mirror 38h, passes through the filter 35g, is reflected by the dichroic mirror 31b, passes through the objective lens 26L, and is projected onto the fundus Ef of the left subject eye EL.

[0049] The fixation projection system 37 can change the fixation position of the left subject eye EL by changing the display position of the pattern on the screen of the liquid crystal panel 37a, and can acquire various images, such as an image centered on the macular part of the fundus Ef, an image centered on the optic disc, an image centered on the center of the fundus between the macular part and the optic disc, and the like.

[0050] (OCT optical system 38) The OCT optical system 38 is an optical system used to perform OCT (Optical Coherence Tomography) measurement and measure the axial length (dimensional information in the anterior-posterior direction) of the left test eye EL, and constitutes an interference measurement mechanism. In particular, the OCT optical system 38 of the first embodiment is an interferometer using optical coherence interferometry. Here, the OCT optical system 38 of the left eye measuring optical system 25L corresponds to the first left eye measuring optical system, and the OCT optical system 38 of the right eye measuring optical system 25R corresponds to the first right eye measuring optical system. In addition, in the ophthalmic apparatus 10 of the first embodiment, the OCT optical system 38 is used to measure the axial length, which is the distance from the cornea to the retina. Note that the dimensional information in the anterior-posterior direction of the test eye measured using the OCT optical system 38 is not limited to this, and may be any one of the anterior chamber depth, which is the distance from the cornea to the crystalline lens, the crystalline lens thickness, which is the thickness of the crystalline lens, and the corneal thickness, which is the thickness of the cornea.

[0051] In the OCT optical system 38, the position of the focusing lens 38c is adjusted based on the results of a refractive measurement performed prior to the OCT measurement so that the end face of the optical fiber f1 is conjugate with the imaging site (fundus Ef or anterior segment) and the optical system.

[0052] The OCT optical system 38 is provided on an optical path that is wavelength-separated from the optical path of the reflex measurement optical system by a filter 35g. The optical path of the fixation projection system 37 is coupled to the optical path of the OCT optical system 38 by a dichroic mirror 38f. This allows the optical axes of the OCT optical system 38 and the fixation projection system 37 to be coaxially coupled.

[0053] The OCT optical system 38 includes an OCT unit 100. As shown in Fig. 5, in the OCT unit 100, an OCT light source 101 includes a tunable light source capable of sweeping the wavelength of emitted light, similar to a general swept-source type OCT device. The tunable light source includes a laser light source including a resonator. The OCT light source 101 changes the output wavelength over time in a near-infrared wavelength band that is not visible to the human eye.

[0054] As illustrated in FIG. 5, the OCT unit 100 is provided with an optical system for performing swept-source OCT. This optical system includes an interference optical system. This interference optical system has a function of splitting light from a variable-wavelength light source into measurement light and reference light, a function of superimposing return light of the measurement light from the subject's eye E and the reference light passing through the reference optical path to generate interference light, and a function of detecting this interference light. A detection result (detection signal) of the interference light obtained by the interference optical system is a signal indicating the spectrum of the interference light, and is sent to the control unit 30. In addition, at least one of the length of the optical path of the measurement light (measurement arm, sample arm) and the length of the optical path of the reference light (reference arm) is variable.

[0055] The OCT light source 101 includes, for example, a near-infrared tunable laser that changes the wavelength of the emitted light (wavelength range of 1000 nm to 1100 nm) at high speed. The light L0 output from the OCT light source 101 is guided to a polarization controller 103 by an optical fiber 102, where its polarization state is adjusted. The light L0 whose polarization state has been adjusted is guided to a fiber coupler 105 by an optical fiber 104, where it is split into a measurement light LS and a reference light LR.

[0056] The reference light LR is guided by an optical fiber 110 to a collimator 111 where it is converted into a parallel beam, and is then guided to a corner cube 114 via an optical path length correction member 112 and a dispersion compensation member 113. The optical path length correction member 112 acts to match the optical path length of the reference light LR with the optical path length of the measurement light LS. The dispersion compensation member 113 acts to match the dispersion characteristics between the reference light LR and the measurement light LS. The corner cube 114 is movable in the incident direction of the reference light LR, thereby changing the optical path length of the reference light LR.

[0057] The reference light LR that has passed through the corner cube 114 passes through the dispersion compensation member 113 and the optical path length correction member 112, is converted from a parallel light beam to a focused light beam by the collimator 116, and enters the optical fiber 117. The reference light LR that has entered the optical fiber 117 is guided to a polarization controller 118 where its polarization state is adjusted, is guided by the optical fiber 119 to an attenuator 120 where the amount of light is adjusted, and is guided by the optical fiber 121 to a fiber coupler 122.

[0058] On the other hand, the measurement light LS generated by the fiber coupler 105 is guided by the optical fiber f1 and converted into a parallel beam by the collimator lens unit 38a, passes through the optical scanner 38b, the focusing lens 38c, the relay lens 38d, and the reflecting mirror 38e, and is reflected by the dichroic mirror 38f.

[0059] The optical scanner 38b deflects the measurement light LS one-dimensionally or two-dimensionally. The optical scanner 38b includes, for example, a first galvanometer mirror and a second galvanometer mirror. The first galvanometer mirror deflects the measurement light LS so as to scan the imaging site (fundus Ef or anterior segment) in a horizontal direction (X direction) perpendicular to the optical axis of the OCT optical system 38. The second galvanometer mirror deflects the measurement light LS deflected by the first galvanometer mirror so as to scan the imaging site in a vertical direction (Y direction) perpendicular to the optical axis of the OCT optical system 38. Examples of the scan pattern of the measurement light LS by the optical scanner 38b include horizontal scan, vertical scan, cross scan, radial scan, circular scan, concentric circle scan, and spiral scan.

[0060] The measurement light LS reflected by the dichroic mirror 38f passes through a relay lens 38g, is reflected by a reflecting mirror 38h, passes through a filter 35g, is reflected by a dichroic mirror 31b, is refracted by the objective lens 26L, and enters the left test eye EL. The measurement light LS is scattered and reflected at various depth positions in the left test eye EL. The return light of the measurement light LS from the left test eye EL travels in the opposite direction along the same path as the outward path, is guided to the fiber coupler 105, and reaches the fiber coupler 122 via the optical fiber 128.

[0061] The fiber coupler 122 generates interference light by combining (causing interference between) the measurement light LS incident via the optical fiber 128 and the reference light LR incident via the optical fiber 121. The fiber coupler 122 splits the interference light at a predetermined splitting ratio (for example, 1:1) to generate a pair of interference lights LC. The pair of interference lights LC are guided to a detector 125 via optical fibers 123 and 124, respectively.

[0062] The detector 125 is, for example, a balanced photodiode. The balanced photodiode includes a pair of photodetectors that detect a pair of interference lights LC, respectively, and outputs a difference between a pair of detection results obtained by these photodetectors. The detector 125 sends this output (detection signal) to a data acquisition system (DAQ) 130.

[0063] The DAQ130 is supplied with a clock KC from the OCT light source 101. The clock KC is generated in the OCT light source 101 in synchronization with the output timing of each wavelength swept within a predetermined wavelength range by the wavelength-variable light source. For example, the OCT light source 101 optically delays one of two branched lights obtained by branching the light L0 of each output wavelength, and then generates the clock KC based on the result of detecting the combined light. The DAQ130 samples the detection signal input from the detector 125 based on the clock KC. The DAQ130 sends the sampling result of the detection signal from the detector 125 to the control unit 30. For example, for each series of wavelength sweeps (for each A line), the control unit 30 forms a reflection intensity profile in each A line by performing a Fourier transform or the like on the spectral distribution based on the sampling data. Furthermore, the control unit 30 may form image data by imaging the reflection intensity profile of each A line.

[0064] In the ophthalmologic apparatus 10 of the first embodiment, an element (movable corner cube 114) for changing the reference arm length is provided to change the difference between the measurement arm length and the reference arm length to move the coherence gate, but other elements may be used. For example, a movable mirror may be provided in the reference arm, or a retroreflector such as a movable corner cube may be provided in the measurement arm.

[0065] The control unit 30 also calculates a refractive power value from the measurement result obtained using the refraction measurement optical system, and moves the refraction measurement light source 35a and the focusing lens 36d in the optical axis direction to a position where the fundus Ef, the refraction measurement light source 35a, and the image sensor 31g are conjugate with each other based on the calculated refractive power value. The control unit 30 may move the focusing lens 38c of the OCT optical system 38 in the optical axis direction in conjunction with the movement of the focusing lens 36d. That is, the OCT optical system 38 can be fine-tuned based on the measurement data of the refractive characteristics using the refraction measurement optical system.

[0066] As shown in FIG. 6, the control unit 30 is connected to the left eye measurement optical system 25L and the right eye measurement optical system 25R, the left and right vertical drive units 23a, 24a, the left and right horizontal drive units 23b, 24b, and the left and right rotation drive units 23c, 24c as the left and right drive mechanisms 21L, 21R, the cameras 39A, 39B, the examiner's controller 19a, the subject's controller 19b, and a memory unit 30d.

[0067] Here, the examiner's controller 19a is an operation mechanism used by the examiner to operate the ophthalmic apparatus 10. The examiner's controller 19a is connected to the control unit 30 by short-distance wireless communication so that they can communicate with each other. Note that the examiner's controller 19a in the first embodiment is a mobile terminal such as a tablet terminal or a smartphone, but it is not limited to the configuration of the first embodiment as long as it is connected to the control unit 30 via a wired or wireless communication path. That is, the examiner's controller 19a may be a notebook personal computer, a desktop personal computer, or the like, and may be configured to be fixed to the ophthalmic apparatus 10.

[0068] The examiner's controller 19a is also provided with a display device 19c. The display device 19c has a display screen 19d (see FIG. 1, etc.) on which images and the like are displayed, and a touch panel type input unit 19e arranged superimposed thereon. The examiner's controller 19a appropriately displays an anterior eye image and the like from an anterior eye observation system 31 on the display screen 19d under the control of the control unit 30. The examiner's controller 19a also outputs operation information, such as an alignment instruction and a measurement instruction, inputted via the input unit 19e, to the control unit 30.

[0069] The subject controller 19b is used to input the subject's response when acquiring various eye characteristics of the left and right test eyes EL and ER. The subject controller 19b may be, for example, an input device such as a control lever, a keyboard, a mouse, or a mobile terminal, though not shown. The subject controller 19b is connected to the control unit 30 via a wired or wireless communication path.

[0070] The control unit 30 centrally controls the operation of the ophthalmologic apparatus 10 in response to appropriate operations on the examiner's controller 19a and the subject's controller 19b by developing a program stored in the connected storage unit 30d or the built-in internal memory 30e, for example, on a RAM (Random Access Memory). In the first embodiment, the storage unit 30d is composed of a ROM (Read Only Memory), an EEPROM (Electrically Erasable Programmable ROM), or the like, and the internal memory 30e is composed of a RAM, or the like.

[0071] The storage unit 30d also stores various data including reference data for various eye characteristics such as the axial length, refractive characteristics, and corneal shape of the subject's eye. Here, the "reference data" refers to data used for judgment by comparing with the measurement data, such as statistical data (e.g., average value, etc.) obtained by statistically processing measurement data of a large number of subjects' eyes, or a data group that can be matched by 50% of people in a predetermined comparison group. The storage unit 30d may also store various measurement data.

[0072] The control unit 30 then aligns the left and right measurement heads 22L, 22R with respect to the left and right test eyes EL, ER using the Z alignment system 32 and the XY alignment system 33. The control unit 30 also simultaneously measures the axial lengths of the left and right test eyes EL, ER using the OCT optical system 38 and two cameras 39A, 39B. The control unit 30 also simultaneously measures the corneal shapes of the left and right test eyes EL, ER using the keratometry system 34. The control unit 30 also simultaneously measures the refractive characteristics of the left and right test eyes EL, ER using the refraction measurement optical system (refraction measurement projection system 35 and refraction measurement light receiving system 36).

[0073] Furthermore, the control unit 30 compares the measurement data obtained by performing each of the above measurements with the reference data read from the storage unit 30d, and outputs the comparison result. The comparison result is output, for example, by displaying it on the display screen 19d of the display device 19c of the examiner's controller 19a.

[0074] In addition, when comparing the measurement data with the reference data, the control unit 30 may take into account the subject's age, the prevalence of myopia in the reference data, and the subject's occupational profile and characteristics, etc. This allows for a more accurate comparison.

[0075] The control unit 30 may also store the measurement data of the subject determined at a time point before the measurement in the storage unit 30d as reference data. This allows, for example, measurement data of the same subject at different times to be compared, and potential changes in the ocular characteristics of the subject's eye can be obtained over a predetermined period of time, making it possible, for example, to easily identify the cause of deteriorating refractive characteristics.

[0076] The control unit 30 may also correct the measurement data of the refractive characteristics of the left and right test eyes EL, ER using the measurement data of the axial lengths of the left and right test eyes EL, ER and / or the measurement data of the corneal shapes of the left and right test eyes EL, ER. That is, the control unit 30 checks the validity of the measurement data of the refractive characteristics of the left and right test eyes EL, ER based on the axial lengths and / or corneal curvatures of the left and right test eyes EL, ER. When the control unit 30 determines that the measurement data of the bending characteristics is not valid, it notifies the examiner that the measurement data is not valid. The examiner is notified by displaying on the display device 19c, outputting a voice, or the like.

[0077] Here, the refractive characteristics of the subject's eye are affected by many factors and environmental conditions, making it difficult to obtain objective refractive characteristics and subject to error. However, the measurement data of the axial length and corneal shape are not affected by, for example, drugs or brain activity. Therefore, the validity of the measurement data of the refractive characteristics can be determined based on the measurement data of the axial length and corneal shape.

[0078] Furthermore, in the ophthalmologic apparatus 10 of the first embodiment, when measuring the eye characteristics (axial length, corneal shape, refractive characteristics) of the left and right test eyes EL, ER, a cycloplegic drug may be administered to the left and right test eyes EL, ER to perform the measurement. However, by performing the measurement without administering a cycloplegic drug, the measurement of the left and right test eyes EL, ER can be performed more easily and quickly.

[0079] An example of the operation of the ophthalmologic apparatus 10 of the first embodiment will be described below with reference to the flowchart shown in FIG.

[0080] In step S1, the examinee's face is fixed by the forehead support 15, and then the control unit 30 receives the examiner's operation on the examiner's controller 19a and turns on the Z alignment light source 32a and the XY alignment light source 33a. The control unit 30 acquires an imaging signal of the anterior eye image formed on the imaging surface of the imaging element 31g, and displays the anterior eye image E' on the display screen 19d of the display device 19c. After that, the left eye measurement head 22L and the right eye measurement head 22R are moved to the examination positions of the left and right test eyes EL, ER. The examination positions are positions where the eye characteristics of the left and right test eyes EL, ER can be measured. The left eye measurement head 22L and the right eye measurement head 22R are arranged at the examination positions through the alignment of the Z alignment system 32, the XY alignment system 33, and the anterior eye observation system 31. The movement of the left eye measuring head 22L and the right eye measuring head 22R is executed by the control unit 30 in accordance with an operation or instruction by the examiner or an instruction by the control unit 30.

[0081] In step S2, following the alignment adjustment in step S1, the control unit 30 simultaneously measures the corneal shapes of the left and right test eyes EL and ER. Step S2 corresponds to a second measurement step in which a measurement using the second left eye measurement optical system and a measurement using the second right eye measurement optical system are simultaneously performed. In addition, "simultaneously measuring the corneal shapes of the left and right test eyes EL and ER" means that the control unit 30 simultaneously controls the keratometric measurement system 34 of the left eye measurement optical system 25L and the keratometric measurement system 34 of the right eye measurement optical system 25R to simultaneously obtain the measurement data of the corneal shape of the left test eye EL and the measurement data of the corneal shape of the right test eye ER. The control unit 30 stores the calculated measurement data of the corneal shapes of the left and right test eyes EL and ER in the memory unit 30d.

[0082] Note that "simultaneous" does not only mean the exact same timing (i.e., no time difference), but also includes the presence of a tolerable time difference. The tolerable time difference may be, for example, either or both of a time difference according to the characteristics of the subject's eye and a time difference according to the characteristics of the ophthalmic device 10. The former can be determined, for example, clinically, and an example of this is a time difference that is not affected by the eye movement of the subject's eye. The latter can be determined, for example, by actual measurement, and an example of this is a time difference involved in the control of the ophthalmic device 10 and a time difference involved in the operation of the ophthalmic device 10. Specific examples of "simultaneity" are as follows:

[0083] If both location measurements are made instantaneously, then both location measurements are said to be "concurrent" if the time difference between one execution and the other is less than or equal to a predefined threshold.

[0084] In addition, when one position measurement is performed instantaneously and the other position measurement is performed non-instantaneously, if the former is performed at any timing within the execution period of the latter position measurement, both position measurements can be said to be "simultaneous." In addition, when the time difference between the execution timing of the former and the start timing or end timing of the latter position measurement is equal to or less than a predetermined threshold, both position measurements can be said to be "simultaneous."

[0085] Furthermore, when both position measurements are performed non-instantaneously, if at least a portion of the execution period of one overlaps with at least a portion of the execution period of the other, both position measurements can be said to be "simultaneous." Also, when the time difference between the end timing of one and the start timing of the other is equal to or less than a predetermined threshold, both position measurements can be said to be "simultaneous."

[0086] The simultaneity described above may be expressed as "approximately simultaneously," "almost simultaneously," "substantially simultaneously," "practically simultaneously," or the like.

[0087] In step S2, the control unit 30 performs arithmetic processing on the image acquired by the image sensor 31g to calculate the corneal radius of curvature, and calculates the corneal refractive power, the degree of corneal astigmatism, and the corneal astigmatism axis angle from the calculated corneal radius of curvature, thereby obtaining the corneal shape.

[0088] In step S2, the control unit 30 presents a fixation target by the fixation projection system 37 and fixes the gaze of the left and right test eyes EL, ER during the measurement of the corneal shape. At this time, the fixation target is presented at the presentation position of infinity, and the left and right test eyes EL, ER are in a state of looking at infinity.

[0089] In step S2, the control unit 30 measures the distances from each of the test eyes EL and ER to the objective lenses 26L and 26R during the measurement of the corneal shape. The control unit 30 also stores the measurement data of the distances during the corneal shape measurement in the memory unit 30d. Here, the distance from the left test eye EL to the objective lens 26L is measured based on images taken by the two cameras 39A and 39B built into the left housing 22a. Therefore, the two cameras 39A and 39B in the left housing 22a correspond to a left eye distance measurement unit that measures the distance from the left test eye EL to the objective lens 26L (predetermined first reference position). In addition, the distance from the right test eye ER to the objective lens 26R is measured based on images taken by the two cameras 39A and 39B built into the right housing 22b. Therefore, the two cameras 39A and 39B in the right housing 22b correspond to a right eye distance measuring unit that measures the distance from the right eye ER to the objective lens 26R (a predetermined second reference position).

[0090] Hereinafter, a method for measuring the distance from each of the test eyes EL, ER to each of the objective lenses 26L, 26R will be described. Note that the method for measuring the distance is the same for the left and right test eyes EL, ER, so the method for measuring the distance from the left test eye EL to the objective lens 26L will be described below.

[0091] First, under the control of the control unit 30, the two cameras 39A and 39B in the left housing 22a capture images of the anterior part of the left subject eye EL from different directions substantially simultaneously. Next, the control unit 30 corrects distortions of the captured images and analyzes the distortion-corrected images to identify a characteristic position of the left subject eye EL, for example, a position corresponding to the pupil center of the anterior part. Then, the control unit 30 acquires three-dimensional position information of the left subject eye EL based on the identified characteristic position (pupil center) of the left subject eye EL.

[0092] That is, as shown in Fig. 8, the distance (baseline length) between the two cameras 39A and 39B is "B". The distance (imaging distance) between the baselines of the two cameras 39A and 39B and the characteristic site P of the left subject's eye EL is "H". The distance (screen distance) between each camera 39A, 39B and its screen plane is "f".

[0093] In such an arrangement, the resolution of the images captured by the two cameras 39A and 39B is expressed by the following equation: Here, Δp represents the pixel resolution. Resolution in xy direction (plane resolution): Δxy=H×Δp / f Resolution in z direction (depth resolution): Δz=H×H×Δp / (B×f)

[0094] Then, the control unit 30 calculates the three-dimensional position of the characteristic portion P, i.e., the distance from the left test eye EL to the objective lens 26L, by applying a known trigonometric method that takes into account the positional relationship shown in Figure 8 to the known positions of the two cameras 39A, 39B and the characteristic position corresponding to the characteristic portion P in the two captured images.

[0095] Furthermore, in step S2, the control unit 30 detects the eye positions of the left and right subjects EL and ER during the corneal shape measurement. The control unit 30 also stores the detection data of the eye positions during the corneal shape measurement in the storage unit 30d.

[0096] Here, the "eye position" is the rotation angle of the left and right test eyes EL, ER around the eyeball rotation axis OL, OR. The rotation angle θ (eye position) is calculated based on the change in the position of the pupil center when the eyeball rotates by the rotation angle θ = (Rr) sinθ, the change in the position of the bright spot image (Br) in the anterior eye photographed image when the eyeball rotates by the rotation angle θ = (Rd) sinθ, and the distance between the pupil center and the bright spot image (Br) when the eyeball rotates by the rotation angle θ = (rd) sinθ. Note that "R" is the distance from the corneal apex to the rotation center of the eyeball, "r" is the radius of curvature of the cornea, and "d" is the distance from the corneal apex to the pupil. Note that if the rotation angle θ and the subject's interpupillary distance are known, the distance to the object being viewed due to convergence can be calculated.

[0097] In addition, biological data such as the distortion of the subject's cornea, pupil position, and refractive index of the components of the subject's eye are not accurately known. Therefore, a correction measurement of the gaze direction of the subject's eye may be performed to estimate each parameter in the above formula before measuring the eye position. The correction measurement is performed by presenting a visual target at a position where the subject's eye can see it properly, acquiring an image of the anterior eye when looking at the presented visual target, and acquiring the pupil center and bright spot image (Br). Then, the rotation angle of the presented visual target is used to correct the rotation angle of the pupil center and bright spot image (Br) at that time.

[0098] In step S3, following the measurement of the corneal shape in step S2, the control unit 30 simultaneously measures the refractive characteristics of the left and right test eyes EL and ER. Step S3 corresponds to a third measurement step in which a measurement using the third left eye measurement optical system and a measurement using the third right eye measurement optical system are simultaneously performed. In addition, "simultaneously measuring the refractive characteristics of the left and right test eyes EL and ER" means that the control unit 30 simultaneously controls the reflex measurement projection system 35 and the reflex measurement light receiving system 36 of the left eye measurement optical system 25L and the reflex measurement projection system 35 and the reflex measurement light receiving system 36 of the right eye measurement optical system 25R to simultaneously obtain the measurement data of the refractive characteristics of the left test eye EL and the measurement data of the refractive characteristics of the right test eye ER. Note that "simultaneously" is as described above. The control unit 30 stores the measurement data of the refractive characteristics of the left and right test eyes EL and ER obtained by the measurement in the memory unit 30d.

[0099] In step S3, the control unit 30 analyzes a ring image (pattern image) obtained by receiving the reflected light (fundus return light) of the ring-shaped measurement light beam projected on the fundus Ef by the reflex measurement projection system 35 at the image sensor 31g. This analysis determines the spherical power, the cylindrical power, and the cylindrical axis angle (refractive characteristics). The control unit 30 stores the calculated measurement data of the refractive characteristics in the memory unit 30d. The analysis of the ring image by the control unit 30 may, for example, first determine the center of gravity of the ring image from the luminance distribution in the image in which the obtained ring image is depicted, and determine the luminance distribution along a plurality of scanning directions extending radially from the center of gravity, and specify the ring image from the luminance distribution. Next, an ellipse is obtained for the specified ring image, and the spherical power, the cylindrical power, and the cylindrical axis angle are obtained by substituting the major axis and minor axis of the ellipse into a known formula. The control unit 30 may also determine the refractive characteristics based on the deformation and deviation of the ring image relative to the reference pattern.

[0100] In step S3, the control unit 30 presents a fixation target by the fixation projection system 37 during the measurement of the refractive characteristics, and fixes the line of sight of the left and right test eyes EL, ER. At this time, the fixation target is presented at a presentation position of infinity, and the left and right test eyes EL, ER are in a state of looking at infinity. In addition, the control unit 30 may move the relay lens 37b to a position where the focus is not correct, and create a cloudy state, after moving the relay lens 37b to the far point of the left and right test eyes EL, ER based on the result of the provisional measurement of the refractive characteristics. As a result, the left and right test eyes EL, ER are in an accommodation rest state (a state where the accommodation of the crystalline lens is removed), and the refractive characteristics can be measured in the accommodation rest state.

[0101] In step S3, the control unit 30 measures the distance from each of the test eyes EL, ER to the objective lenses 26L, 26R during the measurement of the refractive characteristics. The control unit 30 also stores the measurement data of the distance during the measurement of the refractive characteristics in the storage unit 30d. The "method of measuring the distance" is as described above.

[0102] Furthermore, in step S3, the control unit 30 detects the eye positions of the left and right test eyes EL and ER during the refractive characteristic measurement. The control unit 30 also stores the detection data of the eye positions during the refractive characteristic measurement in the storage unit 30d. Note that the "eye positions" are as described above.

[0103] In step S4, following the measurement of the refractive characteristics in step S3, the control unit 30 simultaneously measures the axial lengths of the left and right test eyes EL, ER. Step S4 corresponds to a first measurement step in which a measurement using the first left eye measurement optical system and a measurement using the first right eye measurement optical system are simultaneously performed. In addition, "simultaneously measuring the axial lengths of the left and right test eyes EL, ER" means that the control unit 30 simultaneously photographs the anterior parts of the left and right test eyes EL, ER and performs OCT scans of the fundus Ef of the left and right test eyes EL, ER, and simultaneously obtains the measurement data of the axial length of the left test eye EL and the measurement data of the axial length of the right test eye ER. In addition, "simultaneously" is as described above. The control unit 30 stores the measurement data of the axial lengths of the left and right test eyes EL, ER obtained by the measurement in the memory unit 30d.

[0104] In photographing the anterior eye segments in step S4, for example, the anterior eye segments of the left and right test eyes EL, ER onto which alignment light beams are projected by the XY alignment system 33 are photographed by two cameras 39A, 39B. In the OCT scan, for example, an A-scan (or a B-scan, a three-dimensional scan, or another scan mode) is performed by the OCT optical system 38. The control unit 30 constructs OCT data from data collected by the fundus OCT scan. The OCT data is, for example, a reflection intensity profile or image data.

[0105] Next, the control unit 30 acquires data indicating the arm length when the OCT scan was performed (for example, the position of the corner cube 114). Next, the control unit 30 analyzes the anterior eye photographed image, identifies the position of the bright spot image (Br) in the anterior eye photographed image, and sets a reference position (first reference position) in the anterior eye photographed image based on the corneal curvature radius acquired in step S3. Next, the control unit 30 calculates the deviation (first deviation) of the position of the bright spot image relative to the first reference position, and calculates the alignment error between the left and right test eyes EL, ER and the measurement arm corresponding to the first deviation. Next, the control unit 30 calculates the change amount of the arm length relative to the reference arm length stored in advance. Next, the control unit 30 identifies a coherence gate position corresponding to the arm length, and sets the identified coherence gate position as a reference position (second reference position) in the OCT data. Next, the control unit 30 analyzes the OCT data to identify a data position (retinal surface position) corresponding to the retinal surface of the left and right test eyes EL, ER. Next, the control unit 30 calculates the deviation (second deviation) of the retinal surface position relative to the second reference position. Then, the control unit 30 performs a calculation based on the pre-stored reference axial length, the alignment error, the arm length change amount, and the second deviation to obtain a measurement value of the axial length of the subject's eye E.

[0106] In step S4, the control unit 30 presents a fixation target by the fixation projection system 37 and fixes the gaze of the left and right test eyes EL, ER during the measurement of the axial length. At this time, the fixation target is presented at the presentation position of infinity, and the left and right test eyes EL, ER are in a state of looking at infinity.

[0107] Furthermore, in step S4, the control unit 30 detects the eye positions of the left and right test eyes EL and ER during the axial length measurement. The control unit 30 also stores the detection data of the eye positions during the axial length measurement in the memory unit 30d. Note that the "eye position" is as described above.

[0108] In step S5, following the measurement of the axial length in step S4, the control unit 30 reads out reference data previously stored in the memory unit 30d. Step S5 corresponds to a reading step of reading out the reference data from the memory unit 30d after obtaining the measurement data.

[0109] In step S6, following the reading of the reference data in step S5, the control unit 30 reads the measurement data stored in the memory unit 30d and compares the reference data with the measurement data. Step S6 corresponds to a comparison step in which the reference data and the measurement data are compared.

[0110] In step S7, following the data comparison in step S6, the comparison result is output. The comparison result is displayed on the display device 19c of the examiner controller 19a. Step S7 corresponds to an output step of outputting the comparison result.

[0111] The characteristic functions of the ophthalmologic apparatus 10 of the first embodiment will be described below.

[0112] The ophthalmic device 10 of the first embodiment includes an OCT optical system 38 of the left eye measuring optical system 25L used to measure the axial length of the left eye EL, a keratoscopic measurement system 34 of the left eye measuring optical system 25L used to measure the corneal shape of the left eye EL, and a reflex measurement optical system (reflex measurement projection system 35 and reflex measurement light receiving system 36) of the left eye measuring optical system 25L used to measure the refractive characteristics of the left eye EL. The ophthalmic device 10 of the first embodiment also includes an OCT optical system 38 of the right eye measuring optical system 25R used to measure the axial length of the right eye ER, a keratoscopic measurement system 34 of the right eye measuring optical system 25R used to measure the corneal shape of the right eye ER, and a reflex measurement optical system (reflex measurement projection system 35 and reflex measurement light receiving system 36) of the right eye measuring optical system 25R used to measure the refractive characteristics of the right eye ER.

[0113] When measuring the eye characteristics of the test eye using the ophthalmic apparatus 10 of Example 1, the control unit 30 first controls the Z alignment system 32, the XY alignment system 33, and the anterior eye observation system 31 to position the left eye measurement head 22L and the right eye measurement head 22R at the examination position (step S1 of the flowchart shown in Figure 7).

[0114] Then, the process proceeds to steps S2, S3, and S4 in the flow chart shown in Fig. 7 in order. That is, the control unit 30 controls the OCT optical system 38, the kerato-measuring system 34, the refraction measuring optical system (the refraction measuring projection system 35 and the refraction measuring light receiving system 36) of the left eye measuring optical system 25L, and the two cameras 39A and 39B provided in the left housing 22a, and the OCT optical system 38, the kerato-measuring system 34, the refraction measuring optical system (the refraction measuring projection system 35 and the refraction measuring light receiving system 36) of the right eye measuring optical system 25R, and the two cameras 39A and 39B provided in the right housing 22b. Then, the measurement of the corneal shape is performed simultaneously in the left and right test eyes EL, ER, the measurement of the refractive characteristics is performed simultaneously in the left and right test eyes EL, ER, and the measurement of the axial length is performed simultaneously in the left and right test eyes EL, ER.

[0115] Thus, the ophthalmologic apparatus 10 of the first embodiment can measure the ocular characteristics (axial length, corneal shape, refractive characteristics) of the left and right test eyes EL, ER under substantially the same conditions with both eyes open. As a result, the ocular characteristics of the left and right test eyes EL, ER can be measured under conditions close to those of daily life in which an object is viewed with both the left and right eyes, making it possible to measure the ocular characteristics appropriately.

[0116] In the ophthalmologic apparatus 10 of the first embodiment, the OCT optical system 38, the keratoscopic measurement system 34, and the reflex measurement optical system (the reflex measurement projection system 35 and the reflex measurement light receiving system 36) of the left eye measurement optical system 25L are accommodated in the left housing 22a of the left eye measurement head 22L. In addition, the OCT optical system 38, the keratoscopic measurement system 34, and the reflex measurement optical system (the reflex measurement projection system 35 and the reflex measurement light receiving system 36) of the right eye measurement optical system 25R are accommodated in the right housing 22b of the right eye measurement head 22R. The control unit 30 drives the left drive mechanism 21L and the right drive mechanism 21R, respectively, and controls the positions of the left eye measurement head 22L (left housing 22a) and the right eye measurement head 22R (right housing 22b) in the XYZ directions and the orientations around the eyeball rotation axes OL and OR.

[0117] This allows the optical systems 38, 34, 35, 36 to move integrally with respect to the left and right test eyes EL, ER, facilitating adjustment of alignment, etc. Also, since only one drive mechanism (left drive mechanism 21L, right drive mechanism 21R) is required for each of the left and right measurement heads 22L, 22R housing the optical systems 38, 34, 35, 36, the device can be made compact.

[0118] In the ophthalmic device 10 of the first embodiment, the control unit 30 has a storage unit 30d in which reference data is stored in advance. After acquiring each measurement data of the corneal shape, refractive characteristics, and axial length of the left and right test eyes EL, ER, the process proceeds in order to steps S5, S6, and S7 of the flowchart shown in FIG. 7. That is, the control unit 30 reads out the reference data stored in the storage unit 30d, compares the read out reference data with the measurement data of the ocular characteristics (axial length, corneal shape, refractive characteristics) of the left and right test eyes EL, ER obtained by simultaneously measuring the left and right test eyes EL, ER, and outputs the comparison result. As a result, the examiner can easily evaluate how much the left and right test eyes EL, ER measured by the ophthalmic device 10 deviate from the reference data based on the comparison result, and whether they already exhibit known symptoms, by recognizing the comparison result displayed on the display device 19c, etc.

[0119] In the ophthalmologic apparatus 10 of the first embodiment, the OCT optical system 38, the keratoscopic measurement system 34, and the reflex measurement optical system (the reflex measurement projection system 35 and the reflex measurement light receiving system 36) of the left eye measurement optical system 25L have a common left eye measurement axis LL. Since the configuration of the left eye measurement optical system 25L is the same as that of the right eye measurement optical system 25R, the OCT optical system 38, the keratoscopic measurement system 34, and the reflex measurement optical system (the reflex measurement projection system 35 and the reflex measurement light receiving system 36) of the right eye measurement optical system 25R have a common right eye measurement axis LR.

[0120] As a result, by aligning the common left eye measurement axis LL and right eye measurement axis LR to the left and right test eyes EL and ER, the alignment of the OCT optical system 38, the keratometry system 34, and the reflex measurement optical system (the reflex measurement projection system 35 and the reflex measurement light receiving system 36) can be completed. In addition, by simultaneously aligning each of the optical systems 38, 34, 35, and 36, it is possible to perform measurements using each of the optical systems 38, 34, 35, and 36 under the same alignment conditions, and it is possible to obtain measurement data that can be compared with high accuracy. In addition, it is possible to standardize optical components, thereby making it possible to reduce the number of components.

[0121] In the ophthalmologic apparatus 10 of the first embodiment, two cameras 39A and 39B for measuring the distance from the left eye EL to the objective lens 26L are provided in the left housing 22a, and two cameras 39A and 39B for measuring the distance from the right eye ER to the objective lens 26R are provided in the right housing 22b. In step S2, the control unit 30 measures the distance from the left eye EL to the objective lens 26L and the distance from the right eye ER to the objective lens 26R while measuring the corneal shape using the keratometry system 34. In step S3, the control unit 30 measures the distance from the left eye EL to the objective lens 26L and the distance from the right eye ER to the objective lens 26R while measuring the refractive characteristics using the refraction measurement optical system (refraction measurement projection system 35 and refraction measurement light receiving system 36).

[0122] This makes it possible to determine whether the distances from the left and right test eyes EL, ER to the objective lenses 26L, 26R are suitable for measuring the corneal shape and refractive characteristics, and to perform measurements of the corneal shape and refractive characteristics based on the results of this determination. This allows for more accurate measurements. In addition, when comparing with reference data, highly accurate comparison results can be output.

[0123] The ophthalmologic apparatus 10 of the first embodiment includes a fixation projection system 37 of the left eye measuring optical system 25L used for fixating the left eye EL, and a fixation projection system 37 of the right eye measuring optical system 25R used for fixating the right eye ER. In step S2, the control unit 30 executes measurement of the corneal shape using the keratometry system 34 while fixating the left eye EL using the fixation projection system 37 of the left eye measuring optical system 25L and fixating the right eye ER using the fixation projection system 37 of the right eye measuring optical system 25R. In step S3, the control unit 30 executes measurement of the refractive characteristics using the refraction measurement optical system (refraction measurement projection system 35 and refraction measurement light receiving system 36) while fixating the left eye EL using the fixation projection system 37 of the left eye measuring optical system 25L and fixating the right eye ER using the fixation projection system 37 of the right eye measuring optical system 25R. Furthermore, in step S4, the control unit 30 performs measurement of the axial length using the OCT optical system 38 and the two cameras 39A, 39B while fixating the left test eye EL using the fixation projection system 37 of the left eye measurement optical system 25L and fixating the right test eye ER using the fixation projection system 37 of the right eye measurement optical system 25R.

[0124] This allows the left and right test eyes EL, ER to focus on the fixation target, and the lines of sight of the left and right test eyes EL, ER can be fixed. Here, for accurate measurement, it is essential to set the directions of the lines of sight (visual axes) of the left and right test eyes EL, ER to the correct positions relative to the left eye measurement axis LL and the right eye measurement axis LR. That is, by fixing the lines of sight of the left and right test eyes EL, ER in a desired direction (infinity in the first embodiment), the visual axes can be aligned with the left eye measurement axis LL and the right eye measurement axis LR, and the measurement accuracy of the eye characteristics can be improved.

[0125] In the ophthalmologic apparatus 10 of the first embodiment, the OCT optical system 38 used to measure the axial length (front-rear dimension information) of the left and right test eyes EL, ER constitutes an interference measurement mechanism. For this reason, unlike in the case of performing axial measurement using ultrasound, for example, it is not necessary to contact the eyeball with a probe, and it is possible to prevent measurement errors caused by eyeball pressure. In addition, eye drops are also not required. As a result, it is possible to measure the axial length of the left and right test eyes EL, ER with high accuracy.

[0126] In particular, the OCT optical system 38 of the first embodiment is an interferometer that uses optical coherence interferometry, and therefore, the axial length can be measured using light with a relatively short coherence length, and the optical path length of the OCT optical system 38 can be prevented from becoming unnecessarily long.

[0127] In the ophthalmologic apparatus 10 of the first embodiment, the keratometry system 34 used to measure the corneal shapes of the left and right test eyes EL, ER constitutes a keratometer mechanism. Therefore, the control unit 30 can perform measurement of the corneal shape based on an image obtained by capturing an image of reflected light of a ring-shaped light beam (light beam for measuring the corneal shape) projected onto the left and right test eyes EL, ER.

[0128] In particular, the kerato-measuring system 34 of the first embodiment has a kerato-plate 34a and a kerato-ring light source 34b that project a ring-shaped light beam for corneal shape measurement onto the cornea Cr of the left and right test eyes EL and ER. The control unit 30 obtains the corneal shape by analyzing the image obtained by photographing the anterior eye parts of the left and right test eyes EL and ER on which the pattern image of the ring-shaped light beam is formed. This makes it possible to easily obtain the corneal shape by so-called image processing.

[0129] In the ophthalmologic apparatus 10 of the first embodiment, the refraction measurement optical system (the refraction measurement projection system 35 and the refraction measurement light receiving system 36) used for measuring the refractive characteristics of the left and right test eyes EL and ER constitutes an autorefractometer mechanism. Therefore, it becomes possible to easily measure the refractive characteristics of the left and right test eyes EL and ER.

[0130] In particular, the refraction measurement optical system of the first embodiment has a refraction measurement projection system 35 that projects a measurement light beam (a light beam for measuring refractive characteristics) onto the fundus Ef of the left and right test eyes EL, ER, and a refraction measurement light receiving system 36 that receives the measurement light beam reflected from the fundus Ef of the left and right test eyes EL, ER. This makes it possible to calculate refractive characteristics such as refractive power values ​​by projecting the light beam for measuring refractive characteristics onto the fundus Ef, receiving a reflected image from the fundus Ef, and performing arithmetic processing in the control unit 30.

[0131] In the ophthalmologic apparatus 10 of the first embodiment, the control unit 30 detects the eye positions of the left and right test eyes EL, ER when measuring the corneal shape using the keratometry system 34 in step S2. The control unit 30 also detects the eye positions of the left and right test eyes EL, ER when measuring the refractive characteristics using the refraction measurement optical system (refraction measurement projection system 35 and refraction measurement light receiving system 36) in step S3. Furthermore, the control unit 30 detects the eye positions of the left and right test eyes EL, ER when measuring the axial length using the OCT optical system 38 and two cameras 39A, 39B in step S4.

[0132] This makes it possible to grasp the eye position during measurement of each eye characteristic, and to recognize the validity and accuracy of the measurement data obtained by the measurement. Also, depending on the state of the eye position, it becomes possible to take measures such as redoing the measurement, thereby improving the measurement accuracy.

[0133] The ophthalmic device of the present invention has been described above based on Example 1. However, the specific configuration is not limited to this Example, and design changes and additions are permitted as long as they do not deviate from the gist of the invention according to each claim in the scope of the claims.

[0134] For example, in the first embodiment, when measuring the axial length, which is the dimensional information in the front-back direction of the left and right test eyes EL and ER, the corneal position is measured using two cameras 39A and 39B, and the retinal position is measured using the OCT optical system 38. However, the present invention is not limited to this. For example, as described in JP 2017-189669 A and the like, both the corneal position and the retinal position may be measured using the OCT optical system 38.

[0135] In the ophthalmologic apparatus 10 of the first embodiment, the distances from the left and right test eyes EL, ER to the objective lenses 26L, 26R are measured in both the measurement of the corneal shape and the measurement of the refractive characteristics, but the present invention is not limited to this. The distances from each test eye EL, ER to the objective lenses 26L, 26R may be detected during the measurement of at least one of the corneal shape or the refractive characteristics. It is not necessary to detect the distances from each test eye EL, ER to the objective lenses 26L, 26R.

[0136] In the first embodiment, the first reference position for detecting the distance is the objective lens 26L provided in the left eye measurement head 22L, and the second reference position is the objective lens 26L provided in the right eye measurement head 22R, but this is not limited thereto. For example, the first reference position can be set arbitrarily, such as the center position of the two cameras 39A and 39B. The left eye distance measuring unit and the right eye distance measuring unit may be configured, for example, by an arbitrary distance sensor.

[0137] In the ophthalmologic apparatus 10 of the first embodiment, the left and right test eyes EL and ER are fixed in any of the measurements of the axial length, the corneal shape, and the refractive characteristics. However, this is not limiting, and it is sufficient to fixate at least when measuring any of the axial length, the corneal shape, and the refractive characteristics. Also, it is not necessary to fixate using the fixation projection system 37.

[0138] The ophthalmologic apparatus 10 of the first embodiment measures the corneal shapes of the left and right test eyes EL and ER simultaneously, then measures the refractive characteristics of the left and right test eyes EL and ER simultaneously, and finally measures the axial lengths of the left and right test eyes EL and ER simultaneously. That is, the measurement of each eye characteristic is performed simultaneously, while each eye characteristic is measured in order. However, this is not limited to this. For example, the corneal shapes of the left and right test eyes EL and ER may be measured simultaneously, and the refractive characteristics of the left and right test eyes EL and ER may be measured simultaneously. Furthermore, the axial length may be measured simultaneously with the corneal shapes and refractive characteristics, or all eye characteristics may be measured simultaneously.

[0139] Furthermore, the order of measuring the axial length, corneal shape, and refractive characteristics can be determined arbitrarily, not limited to the order shown in Example 1. Also, fine adjustment of alignment may be performed between measurements of the axial length, corneal shape, and refractive characteristics. [Explanation of symbols]

[0140] 10 Ophthalmology equipment 20 Measurement Units 21L Left drive mechanism 21R Right drive mechanism 22L Left eye measurement head 22R Right eye measurement head 22a Left housing (for the left eye) 22b Right housing (housing for right eye) 25L Left eye measurement optical system 25R Right eye measurement optical system 26L Objective Lens 26R Objective Lens 30 Control section 30d storage section 34 Kerato measurement system (2nd left eye measurement optical system, 2nd right eye measurement optical system) 34a Kerato plate (Kerato projection system) 34b Kerato ring light source (kerato projection system) 35 Reflex measurement projection system (3rd left eye measurement optical system, 3rd right eye measurement optical system) 36 Reflex measurement light receiving system (3rd left eye measurement optical system, 3rd right eye measurement optical system) 37 Fixation projection system (left eye fixation optical system, right eye fixation optical system) 38 OCT optical system (1st left eye measurement optical system, 1st right eye measurement optical system) 39A camera (left eye distance measurement section, right eye distance measurement section) 39B camera (left eye distance measurement section, right eye distance measurement section) 100 OCT units EL Left eye ER right eye LL Left eye measurement axis LR Right eye measurement axis

Claims

1. A first left-eye measurement optical system used for measuring the dimensional information of the left eye to be examined in the front-rear direction, A second left-eye measurement optical system used for measuring the corneal shape of the left eye to be examined, A third left-eye measurement optical system used for measuring the refractive characteristics of the left eye to be examined, A first right-eye measurement optical system used for measuring the dimensional information of the right eye to be examined in the front-rear direction, A second right-eye measurement optical system used for measuring the corneal shape of the right eye to be examined, A third right-eye measurement optical system used for measuring the refractive characteristics of the right eye to be examined, A control unit that controls the first left-eye measurement optical system, the second left-eye measurement optical system, the third left-eye measurement optical system, the first right-eye measurement optical system, the second right-eye measurement optical system, and the third right-eye measurement optical system, and processes the measurement data obtained using each optical system, The control unit simultaneously executes the measurement using the first left-eye measurement optical system and the measurement using the first right-eye measurement optical system, The control unit simultaneously executes the measurement using the second left-eye measurement optical system and the measurement using the second right-eye measurement optical system, The control unit simultaneously executes the measurement using the third left-eye measurement optical system and the measurement using the third right-eye measurement optical system, The validity of the measurement data obtained using the third left-eye measurement optical system is determined by the measurement data obtained using the first left-eye measurement optical system and / or the measurement data obtained using the second left-eye measurement optical system, The validity of the measurement data obtained using the third right-eye measurement optical system is determined by the measurement data obtained using the first right-eye measurement optical system and / or the measurement data obtained using the second right-eye measurement optical system An ophthalmic apparatus characterized by the above.

2. In the ophthalmic apparatus according to Claim 1, The first left-eye measurement optical system, the second left-eye measurement optical system, and the third left-eye measurement optical system are housed in a left-eye housing, The first right-eye measurement optical system, the second right-eye measurement optical system, and the third right-eye measurement optical system are housed in a right-eye housing, The control unit controls the positions and orientations of the left-eye housing and the right-eye housing respectively An ophthalmic apparatus characterized by the above.

3. In the ophthalmic apparatus according to Claim 1 or Claim 2, It has a storage unit that stores reference data, The control unit compares the reference data read from the storage unit with the measurement data and outputs the comparison result An ophthalmic apparatus characterized by the above.

4. In the ophthalmic apparatus according to any one of Claims 1 to 3, The first left-eye measurement optical system, the second left-eye measurement optical system, and the third left-eye measurement optical system have a common left-eye measurement axis. The first right-eye measurement optical system, the second right-eye measurement optical system, and the third right-eye measurement optical system have a common right-eye measurement axis. An ophthalmic apparatus characterized by the above.

5. In the ophthalmic apparatus according to any one of Claims 1 to 4, a left-eye distance measurement unit that measures the distance from the left eye to be examined to a predetermined first reference position, and a right-eye distance measurement unit that measures the distance from the right eye to be examined to a predetermined second reference position, during measurement using at least one of the second left-eye measurement optical system or the third left-eye measurement optical system, the left-eye distance measurement unit measures the distance from the left eye to be examined to the first reference position, and during measurement using at least one of the second right-eye measurement optical system or the third right-eye measurement optical system, the right-eye distance measurement unit measures the distance from the right eye to be examined to the second reference position. An ophthalmic apparatus characterized by the above.

6. In the ophthalmic apparatus according to any one of Claims 1 to 5, a left-eye fixation optical system used for fixation of the left eye to be examined and a right-eye fixation optical system used for fixation of the right eye to be examined, the control unit causes a measurement to be performed using at least one of the first left-eye measurement optical system, the second left-eye measurement optical system, or the third left-eye measurement optical system with the left eye to be examined fixed using the left-eye fixation optical system, and causes a measurement to be performed using at least one of the first right-eye measurement optical system, the second right-eye measurement optical system, or the third right-eye measurement optical system with the right eye to be examined fixed using the right-eye fixation optical system. An ophthalmic apparatus characterized by the above.

7. In the ophthalmic apparatus according to any one of Claims 1 to 6, the first left-eye measurement optical system and the first right-eye measurement optical system constitute an interference measurement mechanism. An ophthalmic apparatus characterized by the above.

8. In the ophthalmic apparatus according to Claim 7, the interference measurement mechanism is an interferometer using optical coherence tomography. An ophthalmic apparatus characterized by the above.

9. In the ophthalmic apparatus according to any one of Claims 1 to 8, the second left-eye measurement optical system and the second right-eye measurement optical system constitute a keratometer mechanism. An ophthalmic apparatus characterized by the above.

10. In the ophthalmic apparatus according to Claim 9, The keratometer mechanism has a keratometric projection system that projects a light beam for corneal shape measurement onto the cornea of the left eye to be examined or the right eye to be examined. The control unit determines the corneal shape based on an image obtained by photographing the anterior segment of the left eye to be examined or the right eye to be examined on which a pattern image is formed by the projection of the light beam for corneal shape measurement. An ophthalmic apparatus characterized by the above.

11. In the ophthalmic apparatus according to any one of Claims 1 to 10, The third left-eye measurement optical system and the third right-eye measurement optical system constitute an auto-refractometer mechanism. An ophthalmic apparatus characterized by the above.

12. In the ophthalmic apparatus according to Claim 11, The auto-refractometer mechanism includes a refraction measurement projection system that projects a light beam for refractive characteristic measurement onto the fundus of the left eye to be examined or the right eye to be examined, and a refraction measurement light receiving system that receives the light beam for refractive characteristic measurement reflected from the fundus of the left eye to be examined or the right eye to be examined. An ophthalmic apparatus characterized by the above.

13. In the ophthalmic apparatus according to any one of Claims 1 to 12, The control unit detects the eye positions of the left eye to be examined and the right eye to be examined during measurement using the first left-eye measurement optical system and the first right-eye measurement optical system, during measurement using the second left-eye measurement optical system and the second right-eye measurement optical system, and during measurement using the third left-eye measurement optical system and the third right-eye measurement optical system. An ophthalmic apparatus characterized by the above.

14. A first left-eye measurement optical system used for measuring the dimension information in the front-rear direction of the left eye to be examined, a second left-eye measurement optical system used for measuring the corneal shape of the left eye to be examined, a third left-eye measurement optical system used for measuring the refractive characteristics of the left eye to be examined, a first right-eye measurement optical system used for measuring the dimension information in the front-rear direction of the right eye to be examined, a second right-eye measurement optical system used for measuring the corneal shape of the right eye to be examined, and a third right-eye measurement optical system used for measuring the refractive characteristics of the right eye to be examined. A control unit that controls the first left-eye measurement optical system, the second left-eye measurement optical system, the third left-eye measurement optical system, the first right-eye measurement optical system, the second right-eye measurement optical system, and the third right-eye measurement optical system, and processes the measurement data obtained using each optical system. A method for examining an eye to be examined, which is executed by an ophthalmic apparatus including the above, A first measurement step of simultaneously performing measurement using the first left-eye measurement optical system and measurement using the first right-eye measurement optical system. A second measurement step of simultaneously performing measurement using the second left-eye measurement optical system and measurement using the second right-eye measurement optical system; A third measurement step of simultaneously performing measurement using the third left-eye measurement optical system and measurement using the third right-eye measurement optical system, and determining the validity of the measurement data obtained using the third left-eye measurement optical system based on the measurement data obtained using the first left-eye measurement optical system and / or the measurement data obtained using the second left-eye measurement optical system; determining the validity of the measurement data obtained using the third right-eye measurement optical system based on the measurement data obtained using the first right-eye measurement optical system and / or the measurement data obtained using the second right-eye measurement optical system. A method for examining an eye to be examined, characterized by the above.

15. In the method for examining an eye to be examined according to claim 14, after obtaining the measurement data in the first measurement step, the second measurement step, and the third measurement step, a reading step of reading the reference data from a storage unit that stores the reference data; a comparison step of comparing the reference data read in the reading step with the measurement data; an output step of outputting the comparison result in the comparison step. A method for examining an eye to be examined, characterized by the above.

16. In the method for examining an eye to be examined according to claim 14 or claim 15, in the first measurement step, the eye positions of the left eye to be examined and the right eye to be examined are detected during measurement using the first left-eye measurement optical system and the first right-eye measurement optical system; in the second measurement step, the eye positions of the left eye to be examined and the right eye to be examined are detected during measurement using the second left-eye measurement optical system and the second right-eye measurement optical system; in the third measurement step, the eye positions of the left eye to be examined and the right eye to be examined are detected during measurement using the third left-eye measurement optical system and the third right-eye measurement optical system. A method for examining an eye to be examined, characterized by the above.

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