Subjective optometer

Abstract

To provide a subjective optometer that can efficiently proceed with alignment of an eye to be measured.SOLUTION: A subjective optometer executes a first rough alignment step of moving a base measurement unit in a back-and-forth direction until when at least part of right and left pupils is detected from an image of anterior ocular segment part; a second rough alignment step of moving a left eye measurement unit and a right eye measurement unit in at least one of the horizontal direction and vertical direction so that the pupil in the image of the anterior ocular segment part and a measurement optical axis are matched; a first fine alignment step of moving the base measurement unit in the back-and-forth direction until when an alignment index is detected from at least one of the right and left pupils in the image of the anterior ocular segment part; and a second fine alignment step of moving the left eye measurement unit and the right eye measurement unit in at least one of the horizontal direction and vertical direction so that the alignment index in the image of the anterior ocular segment part and the measurement optical axis are matched.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a subjective optometry device for subjectively measuring optical characteristics of a subject's eye. [Background technology]

[0002] There is known a subjective optometry device that subjectively measures the optical characteristics of a subject's eye. For example, in Patent Document 1, a visual target light beam from a measurement unit is guided to the subject's eye via a fixed optical member (concave mirror) that is fixedly disposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP2017-86652A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above configuration, in alignment of the test eye, the measurement unit moves relative to the fixed optical member that is fixedly disposed. Therefore, the relationship between the distance from the test eye to the fixed optical member and the distance from the measurement unit to the fixed optical member changes, causing a change in optical magnification, and a change in optical aberration due to the measurement light beam passing through the fixed optical member. However, it was difficult to suppress these effects and efficiently proceed with alignment.

[0005] In view of the above-described conventional techniques, the present disclosure has as its technical object to provide a subjective optometry apparatus capable of efficiently aligning a subject's eye. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure is characterized by having the following configuration. The subjective eye examination device disclosed herein includes a light projection optical system that projects a visual target light beam toward an eye to be examined, a correction optical system that changes optical characteristics of the visual target light beam, and a fixed optical member that is fixedly disposed in an optical path of the light projection optical system and is configured to optically present an image of the visual target light beam to the eye to be examined at a predetermined examination distance, and is a subjective eye examination device for subjectively measuring optical characteristics of the eye to be examined, the light projection optical system including a left eye projecting optical system and a right eye projecting optical system, the light projection optical system including an alignment index projection means that projects an alignment index onto the eye to be examined, and a correction optical system that changes optical characteristics of the eye to be examined. an anterior segment image acquiring means for acquiring an anterior segment image by photographing an anterior segment of the eye; a first moving means for aligning a first optical axis of the left eye projection optical system with the left eye by moving a left eye measurement unit including the left eye projection optical system with respect to the fixed optical member; a second moving means for aligning a second optical axis of the right eye projection optical system with the right eye by moving a right eye measurement unit including the right eye projection optical system with respect to the fixed optical member; and a third moving means for projecting an image of the visual target light beam onto each of the left eye and the right eye at a predetermined optical magnification by integrally moving a base measurement unit including a base measurement unit including a fixed optical member and a fixed optical member, and an alignment control means for aligning the subject's eye by controlling the driving of at least one of the first moving means and the second moving means to move the left eye measurement unit relative to the left eye and the right eye measurement unit relative to the right eye, and controlling the driving of the third moving means to move the base measurement unit relative to both eyes, wherein the alignment control means includes a first coarse alignment step for controlling the driving of the third moving means based on the anterior eye image acquired by the anterior eye image acquisition means, and moving the base measurement unit in the anterior-posterior direction to perform coarse alignment of the subject's eye in the anterior-posterior direction, and after performing the first coarse alignment step, controlling the driving of the first moving means based on the position of the pupil in the anterior eye image,a second coarse alignment step of performing coarse alignment of the subject's eye in the left-right and up-down directions by moving the left-eye measurement unit in at least one of the left-right and up-down directions so that the pupil and the first optical axis coincide, and controlling the driving of the second moving means based on the position of the pupil in the anterior eye image, and moving the right-eye measurement unit in at least one of the left-right and up-down directions so that the pupil and the second optical axis coincide; and a second coarse alignment step of performing coarse alignment of the subject's eye in the left-right and up-down directions by controlling the driving of the third moving means after performing the second coarse alignment step, and moving the base measurement unit in the front-back direction until the alignment index is detected in at least one of the left and right pupils in the anterior eye image. The method is characterized by performing a first fine alignment step of performing fine alignment, and a second fine alignment step of performing fine alignment of the subject's eye in the left-right and up-down directions by controlling the driving of the first moving means based on the alignment index in the anterior eye image after performing the first fine alignment step, and moving the left eye measurement unit in at least one of the left-right and up-down directions so that the alignment index and the first optical axis coincide with each other, and controlling the driving of the second moving means based on the alignment index in the anterior eye image, and moving the right eye measurement unit in at least one of the left-right and up-down directions so that the alignment index and the second optical axis coincide with each other, thereby performing fine alignment of the subject's eye in the left-right and up-down directions. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an external view of a subjective optometry device. [Diagram 2] FIG. 13 is a diagram showing a measurement unit for the left eye. [Diagram 3] FIG. 2 is a schematic diagram showing the inside of the device as viewed from the front. [Figure 4] FIG. 2 is a schematic diagram showing the inside of the device as viewed from the side. [Diagram 5] FIG. 2 is a schematic diagram showing the inside of the device as viewed from above. [Figure 6] FIG. [Figure 7] 10 is a diagram illustrating the initial positions of the first unit, the second unit, and the base unit. FIG. [Figure 8] 11A and 11B are diagrams showing changes in an image of the anterior segment of a test eye and an image captured by a working distance detection optical system. [Figure 9] 1 is a diagram illustrating measurement positions of a first unit, a second unit, and a base unit. FIG. [Figure 10] 1 is an example of an anterior ocular segment image of a subject's eye. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] <Summary> An overview of a subjective optometry device according to an embodiment of the present disclosure will be described. In this embodiment, the left-right direction of the subjective optometry device is the X direction, the up-down direction is the Y direction, and the front-back direction (working distance direction) is the Z direction. The letters L and R attached to the symbols indicate left and right eyes, respectively. Note that the items classified in <> below can be used independently or in association with each other.

[0009] The subjective optometry device of this embodiment subjectively measures the optical characteristics of the subject's eye, such as ocular refractive power (spherical power, cylindrical power, astigmatism axis angle, etc.), contrast sensitivity, binocular vision function (amount of strabismus, stereoscopic vision function, etc.), etc.

[0010] <Alignment target projection means> The subjective eye examination device of this embodiment includes an alignment index projection means (e.g., a control unit 70). For example, the alignment index projection means projects an alignment index onto the subject's eye. For example, the alignment index projection means may include an alignment index projection optical system (e.g., the alignment optical system 40) that projects alignment light onto the subject's eye and forms an alignment index around the cornea of ​​the subject's eye.

[0011] For example, the alignment index projection optical system may include a first alignment index projection means (e.g., the front projection optical system 41) that projects XY alignment indexes for the left-right direction and the up-down direction onto the subject's eye. In this case, a first alignment index image for detecting the XY directions is formed on the cornea of ​​the subject's eye. In addition, for example, the alignment index projection optical system may include a second alignment index projection means (e.g., the working distance detection optical system 45) that projects a Z alignment index for the front-back direction onto the subject's eye. In this case, a second alignment index image for detecting the Z direction is formed on the cornea of ​​the subject's eye. For example, such first alignment index projection means and second alignment index projection means may be provided independently of each other, or at least a part of the configuration may be shared.

[0012] <Anterior segment image acquisition means> The subjective eye examination device of this embodiment includes an anterior eye image acquiring means (e.g., a control unit 70). For example, the anterior eye image acquiring means acquires an anterior eye image by photographing the anterior eye of the subject's eye. For example, the anterior eye image of the subject's eye may be an image including a bright spot image projected onto the subject's eye, or may be an image not including a bright spot image. The anterior eye image of the subject's eye may be one image obtained by photographing both the left eye and the right eye, or may be two images obtained by photographing each of the left eye and the right eye. For example, the anterior eye image acquiring means may include an anterior eye photographing optical system (e.g., an observation optical system 50) for photographing the anterior eye of the subject's eye.

[0013] <Subjective measurement method> The subjective eye examination device of this embodiment includes a subjective measurement means (e.g., a subjective measurement optical system 25). For example, the subjective measurement means includes at least a light projecting optical system (e.g., a light projecting optical system 30) that projects a visual target light beam toward the subject's eye. Furthermore, the subjective measurement means may include a correction optical system (e.g., a correction optical system 60) that changes the optical characteristics of the visual target light beam.

[0014] <Light projection optical system> The light projection optical system projects a visual target light flux toward the subject's eye. The light projection optical system may have at least one optical member that guides the visual target light flux toward the subject's eye.

[0015] The light projection optical system may include a target presenting means. The target presenting means presents a target to the eye to be examined. In this case, the light projection optical system projects a target light beam emitted from the target presenting means toward the eye to be examined. For example, the target presenting means may be a display (for example, display 31). Also, for example, the target presenting means may be a light source and a DMD (Digital Micromirror Device). Also, for example, the target presenting means may be a visible light source for presenting a target and a target plate.

[0016] The light-projecting optical system may have a left-eye light-projecting optical system and a right-eye light-projecting optical system provided in a pair on the left and right sides. For example, the left-eye light-projecting optical system and the right-eye light-projecting optical system may be configured with the same members as the members constituting the left-eye light-projecting optical system and the members constituting the right-eye light-projecting optical system, or at least some of the members may be configured with different members. Also, for example, the left-eye light-projecting optical system and the right-eye light-projecting optical system may be configured with at least some of the members constituting the left-eye light-projecting optical system and the members constituting the right-eye light-projecting optical system shared between them.

[0017] <Correction optical system> The correction optical system is disposed in the optical path of the projection optical system, and changes the optical characteristics of the visual target light beam (at least one of the spherical power, cylindrical power, astigmatism axis angle, polarization characteristics, amount of aberration, etc.).

[0018] For example, the correction optical system may be capable of changing at least one of the spherical power, cylindrical power, and astigmatism axis angle of the visual target light beam by controlling the optical element. The optical element may be at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, a variable focus lens, etc. Of course, an optical element different from these optical elements may also be used.

[0019] Also, for example, the correction optical system may correct the spherical power of the subject's eye by optically changing the presentation distance of the optotype relative to the subject's eye. In this case, the optotype presenting means may be moved in the optical axis direction in order to optically change the presentation distance of the optotype. In this case, the optical element (e.g., a spherical lens, etc.) arranged in the optical path may be moved in the optical axis direction in order to optically change the presentation distance of the optotype.

[0020] In addition, the corrective optical system may be configured by combining a configuration for controlling an optical element, a configuration for moving a visual target presenting means in the optical axis direction, and a configuration for moving an optical element arranged in the optical path in the optical axis direction.

[0021] In this embodiment, the correction optical system may be an eye refraction measuring unit (phoropter) that arranges an optical element in front of the eye to be examined. For example, the eye refraction measuring unit may have a variable focus lens and change the refractive power of the variable focus lens. Also, for example, the eye refraction measuring unit may have a lens disk on which a plurality of optical elements are arranged on the same circumference, and a driving means (e.g., a motor) for rotating the lens disk, and the optical elements may be electrically switched by driving the driving means. Of course, the eye refraction measuring unit may have a variable focus lens, a lens disk, and a driving means. In the case of having these configurations, the visual target light beam toward the eye to be examined is projected via the eye refraction measuring unit.

[0022] In addition, in this embodiment, the correction optical system may be configured such that an optical element is disposed between the target presenting means and an optical member for guiding the target light beam from the light projecting optical system toward the subject's eye, and the optical element is controlled to change the optical characteristics of the target light beam. That is, the correction optical system may be configured as a phantom lens refractometer (phantom correction optical system). In this case, the target light beam corrected by the correction optical system is guided to the subject's eye via the optical member.

[0023] The correction optical system may have a pair of left and right eye correction optical systems. For example, the left eye correction optical system and the right eye correction optical system may be configured with the same members as the members constituting the left eye correction optical system and the members constituting the right eye correction optical system, or at least some of the members may be configured with different members. Also, for example, the left eye correction optical system and the right eye correction optical system may be configured with at least some of the members constituting the left eye correction optical system and the members constituting the right eye correction optical system sharing one another.

[0024] <Fixed optical member> The subjective eye examination device of this embodiment includes a fixed optical member. The fixed optical member is a fixed optical member fixedly disposed in the optical path of the light projection optical system, and is a fixed optical member for optically presenting an image of a visual target light beam to the eye to be examined at a predetermined examination distance. For example, the fixed optical member may guide the visual target light beam from the light projection optical system to the eye to be examined. Also, for example, the fixed optical member may guide the visual target light beam projected from the light projection optical system and further corrected by the correction optical system to the eye to be examined. The fixed optical member may be shared in the optical path of the visual target light beam from the left eye measurement unit (described later) and the optical path of the visual target light beam from the right eye measurement unit (described later). For example, at least one of a concave mirror (e.g., a concave mirror 85), a lens, and the like can be used as the fixed optical member.

[0025] In this embodiment, a concave mirror is used to optically present an image of the target light beam to the subject's eye at a predetermined test distance, which eliminates the need to place a predetermined optical member at the actual distance, thereby making it possible to reduce the space required for the device.

[0026] <1st means of transportation> The subjective optometry device of this embodiment includes a first moving means (e.g., a moving unit 9L). For example, the first moving means is used to align the first optical axis of the left eye projection optical system to the left eye by moving the left eye measurement unit including the left eye projection optical system relative to a fixed optical member. For example, the first moving means may be configured to be able to move the left eye measurement unit at least in the X direction and the Y direction. Of course, for example, the first moving means may be configured to be able to further move the left eye measurement unit in the Z direction. In other words, the first moving means may be configured to be able to move the left eye measurement unit in three-dimensional directions.

[0027] The left eye measurement unit may be a measurement unit including at least a left eye projection optical system. For example, the left eye measurement unit may be configured as a measurement unit including only a left eye projection optical system, or may be configured as a measurement unit including both a left eye projection optical system and a left eye correction optical system.

[0028] <Second transportation means> The subjective optometry device of this embodiment includes a second moving means (e.g., a moving unit 9R). For example, the second moving means is used to align the second optical axis of the right-eye projection optical system with the right eye by moving the right-eye measurement unit including the right-eye projection optical system relative to the fixed optical member. For example, the second moving means may be configured to be able to move the right-eye measurement unit at least in the X direction and the Y direction. Of course, for example, the second moving means may be configured to be able to further move the right-eye measurement unit in the Z direction. That is, the second moving means may be configured to be able to move the right-eye measurement unit in three-dimensional directions.

[0029] The right-eye measurement unit may be a measurement unit including at least a right-eye projection optical system. For example, the right-eye measurement unit may be configured as a measurement unit including only a right-eye projection optical system, or may be configured as a measurement unit including both a right-eye projection optical system and a left-eye correction optical system.

[0030] <Third means of transportation> The subjective optometry device of this embodiment includes a third moving means (e.g., a moving unit 8). For example, the third moving means is used to project an image of the visual target light beam onto each of the left and right eyes at a predetermined optical magnification by integrally moving a base measurement unit including a left eye measurement unit, a right eye measurement unit, and a fixed optical member relative to both eyes. For example, the third moving means may be configured to be able to move the base measurement unit at least in the Z direction. Of course, for example, the third moving means may be configured to be able to further move the base measurement unit in the X direction and the Y direction. In other words, the third moving means may be configured to be able to move the base measurement unit in three-dimensional directions.

[0031] <Alignment control means> The subjective optometry device of this embodiment includes an alignment control means (e.g., a control unit 70). For example, the alignment control means controls the driving of at least one of the first moving means and the second moving means to move the left eye measurement unit relative to the left eye and the right eye measurement unit relative to the right eye, and controls the driving of the third moving means to move the base measurement unit relative to both eyes, thereby aligning the examined eye.

[0032] In this embodiment, the alignment control means sequentially performs a plurality of alignment steps. For example, the alignment control means sequentially performs rough alignment and fine alignment in each of the XY direction and the Z direction. This allows the alignment of the subject's eye to proceed efficiently.

[0033] In order to project an appropriate image of the target light beam on the subject's eye, it is preferable that the first distance from the subject's eye to the fixed optical member and the second distance from the fixed optical member to the left eye measurement unit and the right eye measurement unit have a predetermined relationship and maintain a conjugate relationship. However, for example, if the first distance and the second distance do not have a predetermined relationship, the optical magnification at the first distance and the second distance changes, causing the conjugate relationship to be lost. Therefore, for example, in rough alignment of the subject's eye, the base measurement unit may be moved first to perform alignment in the Z direction. Similarly, for example, in fine alignment, the base measurement unit may be moved first to perform alignment in the Z direction. This minimizes the change in the optical magnification at the first distance and the second distance, and allows the appropriate image of the target light beam to be projected. As a result, the optical characteristics of the subject's eye can be measured with high accuracy.

[0034] Also, for example, in order to project an appropriate image of the visual target light beam onto the subject's eye, it is preferable to make the optical axis of the light projection optical system coincide (approximately coincide) with the subject's eye. For this reason, when the left eye measurement unit and the right eye measurement unit are moved relative to the subject's eye (relative to the fixed optical member), optical aberration may occur due to the visual target light beam passing through the fixed optical member. For example, the greater the movement of the left eye measurement unit and the right eye measurement unit relative to the fixed optical member, the greater the optical aberration may occur. However, in both the rough alignment and the fine alignment described above, by moving the base measurement unit first, the movement of the left eye measurement unit and the right eye measurement unit can be minimized, and the optical aberration can be made smaller. As a result, the optical characteristics of the subject's eye can be measured with high accuracy.

[0035] For example, the alignment control means may perform a first coarse alignment step, in which the alignment control means controls driving of the third moving means based on the anterior eye image acquired by the anterior eye image acquisition means, and performs coarse alignment of the subject's eye in the anterior-posterior direction by moving the base measurement unit in the anterior-posterior direction until at least a part of the left and right pupils is detected in the anterior eye image.

[0036] For example, the alignment control means may perform a first coarse alignment step and then a second coarse alignment step. For example, in the first fine alignment step, the drive of the first moving means may be controlled based on the position of the pupil in the anterior eye image acquired by the anterior eye image acquisition means, and the measurement unit for the left eye may be moved in at least one of the left-right and up-down directions so that the pupil and the first optical axis are aligned, while the drive of the second moving means may be controlled based on the position of the pupil in the anterior eye image, and the measurement unit for the right eye may be moved in at least one of the left-right and up-down directions so that the pupil and the second optical axis are aligned, thereby performing coarse alignment of the test eye in the left-right and up-down directions.

[0037] For example, the alignment control means may perform the first fine alignment step after performing the second coarse alignment step. For example, in the first fine alignment step, the alignment control means may perform fine alignment in the anterior-posterior direction of the subject's eye by controlling the driving of the third moving means to move the base measurement unit in the anterior-posterior direction until an alignment index is detected in at least one of the left and right pupils in the anterior eye image.

[0038] For example, the alignment control means may perform the second fine alignment step after performing the first fine alignment step. For example, in the second fine alignment step, the alignment control means may control the driving of the first moving means based on the alignment index in the anterior eye image acquired by the anterior eye image acquisition means to move the left eye measurement unit in at least one of the left and right directions and the up and down directions so that the alignment index and the first optical axis coincide with each other, and the alignment control means may control the driving of the second moving means based on the alignment index in the anterior eye image to move the right eye measurement unit in at least one of the left and right directions and the up and down directions so that the alignment index and the second optical axis coincide with each other, thereby performing fine alignment in the left and right directions and the up and down directions of the subject eye.

[0039] For example, the alignment control means may perform an adjustment step when an alignment index is detected only in one of the left and right pupils by the first fine alignment step, and may perform a second fine alignment step after performing the adjustment step. For example, in the adjustment step, the driving of the first moving means or the second moving means may be controlled to move the left eye measurement unit or the right eye measurement unit in the front-back direction until the alignment index is detected in the other of the left and right pupils, thereby making an adjustment so that the alignment index is detected in both the left and right pupils. This allows the alignment of the subject's eye to be efficiently performed even when there is a difference in the front-back positions of the left and right eyes, such as when the subject's face is facing diagonally.

[0040] For example, the alignment control means may move the base measurement unit in the front-rear direction in the first fine alignment step until an XY alignment index is detected in at least one of the left and right pupils in the anterior eye image, and may further move the left eye measurement unit in the front-rear direction based on the focus state of the Z alignment index, and may move the right eye measurement unit in the front-rear direction based on the focus state of the Z alignment index. For example, this can improve the alignment accuracy in the Z direction of the subject eye.

[0041] The alignment control means may be configured to start control of the next alignment step at any timing after starting control of the previous alignment step. For example, the alignment control means may start control of the previous alignment step and start control of the next alignment step before the control is completed. Also, for example, the alignment control means may start control of the previous alignment step and start control of the next alignment step after the control is completed.

[0042] <Example> An example of a subjective optometry apparatus (hereinafter, optometry apparatus) according to this embodiment will be described.

[0043] FIG. 1 is an external view of an optometry apparatus 100. For example, the optometry apparatus 100 includes a housing 2, a presentation window 3, a forehead rest 4, a chin rest 5, a controller 6, an imaging unit 90, and the like. The housing 2 includes a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, and the like inside. The presentation window 3 is used to present a visual target to the eye E to be examined. The forehead rest 4 and the chin rest 5 are used to keep the distance between the eye E to be examined and the optometry apparatus 1 constant. The controller 6 includes a monitor 6a, a switch unit 6b, and the like. The monitor 6a displays various information (e.g., measurement results of the eye to be examined, etc.). The monitor 6a may be a touch panel that also functions as the switch unit 6b. The switch unit 6b is used to perform various settings (e.g., input of a start signal, etc.). A signal corresponding to an operation instruction from the controller 6 is output to the control unit 70 by wired communication or wireless communication.

[0044] The imaging unit 90 is used to capture an image of the subject's face and adjust the position of the subject's eye in the Y direction. The imaging unit 90 includes an imaging optical system (not shown). For example, the imaging optical system may be composed of an imaging element and a lens. In this embodiment, the imaging unit 90 is provided in a base unit U3 (to be described later) and moves in the Z direction together with the base unit U3.

[0045] <Measurement part> The measurement unit 7 includes a left eye measurement unit 7L and a right eye measurement unit 7R. The left eye measurement unit 7L and the right eye measurement unit 7R are configured from the same material. Of course, the left eye measurement unit 7L and the right eye measurement unit 7R may be configured from at least a part of different materials. The measurement unit 7 has a pair of left and right subjective measurement units and a pair of left and right objective measurement units (details will be described later). The target light beam and the measurement light beam from the measurement unit 7 are guided to the subject's eye E through the presentation window 3.

[0046] 2 is a diagram showing the left eye measurement unit 7L. The right eye measurement unit 7R has the same configuration as the left eye measurement unit 7L, so it is omitted. For example, the left eye measurement unit 7L includes an objective measurement optical system 10, a subjective measurement optical system 25, an observation optical system 50, an alignment optical system 40, etc.

[0047] <Objective measurement optical system> The objective measuring optical system 10 is used as a part of an objective measuring unit that objectively measures the optical characteristics of the subject's eye E. In this embodiment, the ocular refractive power of the subject's eye E is measured as the optical characteristic of the subject's eye E. For example, the objective measuring optical system 10 is composed of a projection optical system 10a and a light receiving optical system 10b.

[0048] The projection optical system 10a projects a spot-shaped measurement target on the fundus of the subject's eye E through the center of the pupil of the subject's eye E. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hole mirror 13, a prism 15, an objective lens 93, a dichroic mirror 35, a dichroic mirror 29, and the like. The light-receiving optical system 10b extracts the fundus-reflected light beam reflected by the fundus of the subject's eye E in a ring shape through the peripheral part of the pupil of the subject's eye E. For example, the light-receiving optical system 10b includes a dichroic mirror 29, a dichroic mirror 35, an objective lens 93, a prism 15, a hole mirror 13, a relay lens 16, a mirror 17, a light-receiving aperture 18, a collimator lens 19, a ring lens 20, an image sensor 22, and the like. In this embodiment, the description of the projection optical system 10a and the light-receiving optical system 10b is omitted. For details of these, please refer to, for example, JP 2018-47049 A.

[0049] <Subjective measurement optical system> The subjective measurement optical system 25 is used as a part of a subjective measurement unit that subjectively measures the optical characteristics of the subject's eye E. In this embodiment, the ocular refractive power of the subject's eye E is measured as the optical characteristics of the subject's eye E. For example, the subjective measurement optical system 25 is composed of a light projection optical system 30 and a correction optical system 60.

[0050] The light projection optical system 30 projects a visual target light flux toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a light projection lens 33, a light projection lens 34, a reflecting mirror 36, an objective lens 92, a dichroic mirror 35, a dichroic mirror 29, etc. A visual target (a fixation target, a test visual target, etc.) is displayed on the display 31.

[0051] The correction optical system 60 is disposed in the optical path of the projection optical system 30. The correction optical system 60 changes the optical characteristics of the visual target light beam emitted from the display 31. For example, the correction optical system 60 includes an astigmatism correction optical system 63, a driving mechanism 39, and the like. The astigmatism correction optical system 63 is used to correct the cylindrical power and astigmatism axis angle of the subject's eye E. The astigmatism correction optical system 63 is disposed between the projection lens 33 and the projection lens 34. The astigmatism correction optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lenses 61a and 61b are independently rotated around the optical axis L2 by the driving of the rotation mechanisms 62a and 62b.

[0052] In this embodiment, the cylindrical lens 61a and the cylindrical lens 61b are used as the astigmatism correcting optical system 63, but the present invention is not limited to this. The astigmatism correcting optical system 63 may be configured to correct the cylindrical power, the astigmatism axis angle, etc. As an example, a corrective lens may be inserted into or removed from the optical path of the projection optical system 30.

[0053] The light source 11 and relay lens 12 included in the projection optical system 10a, the light receiving diaphragm 18, collimator lens 19, ring lens 20, and image sensor 22 included in the light receiving optical system 10b, and the display 31 included in the light projection optical system 30 can be moved integrally in the optical axis direction by a drive mechanism 39. In other words, the display 31, light source 11, relay lens 12, light receiving diaphragm 18, collimator lens 19, ring lens 20, and image sensor 22 are synchronized as a drive unit 95, and are moved integrally by the drive mechanism 39. The drive mechanism 39 is composed of a motor and a slide mechanism.

[0054] The driving mechanism 39 moves the display 31 in the direction of the optical axis L2 by moving the driving unit 95 in the direction of the optical axis. This allows the subject's eye E to be fogged in the objective measurement. In the subjective measurement, the presentation distance of the optotype to the subject's eye E can be optically changed to correct the spherical power of the subject's eye E. That is, the configuration for moving the display 31 in the direction of the optical axis L2 is used as a spherical correction optical system for correcting the spherical power of the subject's eye E, and the spherical power of the subject's eye E is corrected by changing the position of the display 31. The configuration of the spherical correction optical system may be different from that of this embodiment. For example, the spherical power may be corrected by arranging a number of optical elements in the optical path. Also, for example, the spherical power may be corrected by arranging a lens in the optical path and moving the lens in the direction of the optical axis.

[0055] Further, the driving mechanism 39 moves the driving unit 95 in the optical axis direction, thereby moving the light source 11, the relay lens 12, and the image sensor 22 from the light receiving aperture 18 in the optical axis L1 direction. As a result, the light source 11, the light receiving aperture 18, and the image sensor 22 are arranged so as to be optically conjugate with the fundus of the subject's eye E. Regardless of the movement of the driving unit 95, the hole mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the subject's eye E at a constant magnification. Therefore, the fundus reflected light beam, which is the measurement light beam of the projection optical system 10a, is always incident on the ring lens 20 of the light receiving optical system 10b as a parallel light beam, and a ring-shaped light beam of the same size as the ring lens 20 is imaged by the image sensor 22 in a focused state, regardless of the ocular refractive power of the subject's eye E.

[0056] <Observation optical system> The observation optical system 50 is used to observe and image the anterior segment of the subject's eye E. For example, the observation optical system 50 includes an objective lens 103, an imaging lens 51, an imaging element 52, and the like. For example, anterior segment observation light illuminating the subject's eye E and an alignment light beam projected onto the subject's eye E pass through a dichroic mirror 29 and are imaged by the imaging element 52 via the imaging lens 51. For example, the imaging element 52 has an imaging surface disposed at a position conjugate with the anterior segment of the subject's eye E. The observation optical system 50 also serves as an optical system for detecting a first alignment target image formed on the cornea Ec of the subject's eye E by a front projection optical system 41 (described later) of the alignment optical system 40.

[0057] <Alignment optical system> The alignment optical system 40 projects alignment indices for the X, Y, and Z directions onto the cornea of ​​the subject's eye, and detects the corneal reflected light of the alignment indices with a detector. For example, the alignment optical system 40 is composed of a front projection optical system 41 and a working distance detection optical system 45.

[0058] The front projection optical system 41 projects alignment indices for the XY directions toward the cornea Ec of the subject's eye E. For example, the front projection optical system 41 includes an infrared light source 42, a lens 43, and the like. For example, an infrared light beam (alignment light beam) emitted from the infrared light source 42 is reflected by a half mirror 44 via the lens 43 and reaches the subject's eye E. For example, this causes a first alignment indices image for detecting the XY directions to be formed on the cornea Ec of the subject's eye.

[0059] In this embodiment, the front projection optical system 41 can be used as an alignment index for the Z direction. In this case, for example, the focus state of the first alignment index image (as an example, the position where the first alignment index image is most in focus) may be detected.

[0060] The working distance detection optical system 45 projects an alignment index for the Z direction toward the cornea Ec of the test eye E. For example, the working distance detection optical system 45 performs precise alignment of the measurement unit 7 with respect to the test eye in the Z direction. For example, the working distance detection optical system 45 has a light projection optical system 45a and a detection optical system 45b. The optical axis of the light projection optical system 45a and the optical axis of the detection optical system 45b are arranged at positions symmetrical with respect to the optical axes of the objective measurement optical system 10, the subjective measurement optical system 25, and the observation optical system 50. For example, the light projection optical system 45a projects detection light for detecting the alignment state of the measurement unit 7 with respect to the test eye E (in other words, the focus state of each optical system included in the measurement unit 7) from an oblique direction toward the cornea Ec. For example, the light projection optical system 45a has an illumination light source 46, a condenser lens 47, a pinhole plate 48, and a projection lens 49. The cornea Ec and the pinhole plate 48 are arranged at approximately conjugate positions. On the other hand, the detection optical system 45b detects the corneal reflection light of the detection light from the cornea Ec. For example, the detection optical system 45b has an objective lens 56 and a detector 57. For example, the detector 57 may be a detector (photodetector) in which a plurality of pixels are arranged. As an example, a one-dimensional light receiving element (line sensor) may be used. The cornea Ec and the detector 57 are disposed at approximately conjugate positions.

[0061] For example, the detection light emitted from the illumination light source 46 illuminates the pinhole plate 48 via the condenser lens 47. The detection light that passes through the opening of the pinhole plate 48 is projected onto the cornea Ec via the projector lens 49 and is reflected by the cornea Ec. The corneal reflected light then passes through the objective lens 56 and is detected by the detector 57. Note that the position at which the detection light is received by the detector 57 changes depending on the positional relationship in the Z direction between the subject's eye E and the measurement unit 7. For this reason, the amount of alignment deviation in the Z direction can be detected by detecting the deviation between the detection light receiving position and the proper alignment position.

[0062] <Internal structure of the optometry device> The internal configuration of the optometry apparatus 100 will be described. Fig. 3 is a schematic diagram of the inside of the optometry apparatus 100 as viewed from the front. Fig. 4 is a schematic diagram of the inside of the optometry apparatus 100 as viewed from the side. Fig. 5 is a schematic diagram of the inside of the optometry apparatus 100 as viewed from above. For ease of explanation, Figs. 4 and 5 only show the optical axis of the left eye measurement unit 7L.

[0063] The optometry apparatus 100 includes an objective measurement unit. For example, the objective measurement unit includes a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, and the like. The optometry apparatus 100 also includes a subjective measurement unit. For example, the subjective measurement unit includes a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, and the like. The objective measurement unit and the subjective measurement unit are not limited to this configuration. For example, the configuration may not include the reflection mirror 84. In this case, the light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. In addition, for example, the configuration may include a half mirror. In this case, the light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 through the half mirror.

[0064] For example, the deflection mirror 81 has a left-eye deflection mirror 81L and a right-eye deflection mirror 81R that are provided in a pair on the left and right sides. For example, the deflection mirror 81 is disposed between the correction optical system 60 and the subject's eye E. That is, the correction optical system 60 in this embodiment has a left-eye corrective optical system and a right-eye corrective optical system that are provided in a pair on the left and right sides, and the left-eye deflection mirror 81L is disposed between the left-eye corrective optical system and the left eye EL, and the right-eye deflection mirror 81R is disposed between the right-eye corrective optical system and the right eye ER. For example, the deflection mirror 81 is preferably disposed at a pupil conjugate position.

[0065] For example, the left-eye deflection mirror 81L reflects the light beam projected from the left-eye measurement unit 7L and guides it to the left eye EL. Also, for example, the left-eye deflection mirror 81L reflects the fundus reflection light beam from the left eye EL and guides it to the left-eye measurement unit 7L. For example, the right-eye deflection mirror 81R reflects the light beam projected from the right-eye measurement unit 7R and guides it to the right eye ER. Also, for example, the right-eye deflection mirror 81R reflects the fundus reflection light beam from the right eye ER and guides it to the right-eye measurement unit 7R.

[0066] For example, the deflection mirror 81 is rotationally moved by the drive unit 82. For example, the rotational movement of the deflection mirror 81 can deflect an apparent light beam for forming an image of the visual target light beam in front of the subject's eye, and optically correct the formation position of the image of the visual target light beam. For example, the drive unit 82 is composed of a motor or the like. For example, the drive unit 82 rotates the deflection mirror 81 about a rotation axis in the X direction (horizontal direction) and a rotation axis in the Y direction (vertical direction). That is, the drive unit 82 rotates the deflection mirror 81 in the XY direction. Note that the rotation of the deflection mirror 81 may be in either the X direction or the Y direction. For example, the drive unit 82 has a drive unit 82L for driving the left-eye deflection mirror 81L and a drive unit 82R for driving the right-eye deflection mirror 81R.

[0067] In this embodiment, the configuration using the deflection mirror 81 as the deflection member that reflects and guides the light beam projected from the measurement unit 7 to the subject's eye E has been described as an example, but the present invention is not limited to this. The deflection member may be a prism, a lens, or the like as long as it can reflect and guide the light beam projected from the measurement unit 7 to the subject's eye E.

[0068] Also, for example, a plurality of deflection mirrors 81 may be provided in each of the left eye optical path and the right eye optical path. For example, two deflection mirrors may be provided in each of the left eye optical path and the right eye optical path (for example, two deflection mirrors may be provided in the left eye optical path, etc.). In this case, one deflection mirror may be rotated in the X direction, and the other deflection mirror may be rotated in the Y direction.

[0069] For example, the concave mirror 85 guides the visual target light beam that has passed through the correction optical system 60 to the subject's eye E, and forms an image of the visual target light beam that has passed through the correction optical system 60 in front of the subject's eye E. For example, the concave mirror 85 is shared by the left eye measurement unit 7L and the right eye measurement unit 7R. For example, the concave mirror 85 is shared by the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system. That is, the concave mirror 85 is disposed at a position where both the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system pass through. Of course, the concave mirror 85 does not have to be configured to be shared by the left eye optical path and the right eye optical path. That is, a concave mirror may be provided in each of the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system.

[0070] <Optical paths between objective and subjective measurement sections> The optical path of the objective measurement unit will be described by taking the optical path for the left eye as an example. The optical path for the right eye has the same configuration as the optical path for the left eye. The measurement light beam emitted from the light source 11 of the projection optical system 10a reaches the left eye EL via each optical member. For example, the measurement light beam is guided from the measurement unit for the left eye 7L to the deflection mirror for the left eye 81L by passing through the optical members from the relay lens 12 to the dichroic mirror 29 in order. Furthermore, the visual target light beam is reflected by the deflection mirror for the left eye 81L and guided to the left eye EL via the reflection mirror 84 and the concave mirror 85. A spot-shaped point light source image is formed on the fundus of the left eye EL. At this time, the prism 15 rotating around the optical axis causes the pupil projection image of the hole part in the hole mirror 13 (projection light beam on the pupil) to be eccentrically rotated at high speed.

[0071] At the fundus of the subject's eye E, the measurement light beam is reflected and emitted, and is guided to the left-eye measurement unit 7L via the concave mirror 85, the reflecting mirror 84, and the deflection mirror 81. The measurement light beam is further reflected by the dichroic mirror 29 and the dichroic mirror 35, and is collected by the objective lens 93. The measurement light beam is then collected again on the opening of the light receiving diaphragm 18 via the prism 15 rotating at high speed and the optical members from the hole mirror 13 to the mirror 17, and is then focused as a ring-shaped image on the image sensor 22 by the collimator lens 19 and the ring lens 20. The optical characteristics of the subject's eye E can be objectively measured by analyzing the ring-shaped image captured by the image sensor 22.

[0072] The optical path of the subjective measurement section will be described by taking the optical path for the left eye as an example. The optical path for the right eye has the same configuration as the optical path for the left eye. The visual target light beam emitted from the display 31 of the subjective measurement optical system 25 reaches the left eye EL via each optical member. For example, the visual target light beam is guided from the left eye measurement section 7L to the left eye deflection mirror 81L by passing through the optical members from the light projecting lens 33 to the dichroic mirror 29 in order. Furthermore, the visual target light beam is reflected by the left eye deflection mirror 81L and guided to the left eye EL via the reflection mirror 84 and the concave mirror 85.

[0073] As a result, an image of the visual target light beam corrected by the correction optical system 60 is formed on the fundus of the left eye EL based on the eyeglass wearing position of the left eye EL (for example, about 12 mm from the corneal apex position). Therefore, adjustment of the spherical power by the correction optical system (in this embodiment, driving of the drive mechanism 39) is performed in front of the eye, which is equivalent to placing the astigmatism correcting optical system 63 in front of the eye. The subject can collimate the image of the visual target light beam optically formed in front of the eye at a predetermined test distance via the concave mirror 85 in a natural state.

[0074] <First unit, second unit and base unit> In this embodiment, the inside of the optometry device 100 is composed of a first unit U1, a second unit U2, and a base unit U3. For example, the first unit U1 and the second unit U2 are provided in a pair on the left and right. For example, the first unit U1 is a unit for integrally moving the left eye measurement unit 7L and the left eye deflection mirror 81L. That is, the first unit U1 is a unit for integrally moving the projection optical system 30 and the correction optical system 60 included in the left eye measurement unit 7L, and the left eye deflection mirror 81L. Similarly, the second unit U2 is a unit for integrally moving the right eye measurement unit 7R and the right eye deflection mirror 81R. That is, the second unit U2 is a unit for integrally moving the projection optical system 30 and the correction optical system 60 included in the right eye measurement unit 7R, and the right eye deflection mirror 81R. For example, the base unit U3 is a unit for moving the first unit U1, the second unit U2, the reflecting mirror 84, and the concave mirror 85 as a unit.

[0075] For example, the first unit U1 is moved in three-dimensional directions by the moving unit 9L relative to a base 86L fixed in the base unit U3. This allows, for example, the first unit A1 to move in three-dimensional directions relative to the concave mirror 85. Note that the incident position of the apparent light beam for forming an image of the visual target light beam in front of the subject's eye is changed relative to the concave mirror 85 by the movement of the first unit A1 in at least one of the X and Y directions. In addition, the distance from the concave mirror 85 to the first unit A1 changes due to the movement of the first unit A1 in the Z direction, and the presentation distance of the image of the visual target light beam from the measurement unit 7 is changed.

[0076] For example, the moving unit 9L is composed of an X moving section, a Y moving section, a Z moving section, a driving section, and the like. As an example, the X moving section may be a slide mechanism that moves the Y moving section in the X direction relative to the base 86L. Also, the Y moving section may be a slide mechanism that moves the Z moving section in the Y direction relative to the X moving section. Also, the Z moving section may be a slide mechanism that moves the first unit U1 in the Z direction relative to the Y moving section. That is, the first unit U1 is connected to the Z moving section, and is moved in three-dimensional directions relative to the base 86L through the movement of the Z moving section, the movement of the Y moving section, and the movement of the X moving section. For example, the driving section may include a plurality of motors or the like for driving each moving section.

[0077] For example, the second unit U2 is moved in three-dimensional directions by the moving unit 9R relative to a base 86R fixed in the base unit U3. Note that the configurations of the second unit U2 and the moving unit 9R are similar to the configurations of the first unit U1 and the moving unit 9L, respectively, and therefore will not be described.

[0078] For example, the base unit U3 is moved in the Z direction by the moving unit 8 relative to a base 87 fixed in the housing 2. This allows, for example, the base unit U3 to move in the Z direction relative to the subject's eye E. For example, the first unit U1 and the second unit U2 (the left eye measurement unit 7L and the right eye measurement unit 7R) can be moved in the Z direction by moving the base unit U3 in the Z direction without changing the distance from the concave mirror 85 to the first unit U1 and the second unit U2. In other words, the first unit U1 and the second unit U2 (the left eye measurement unit 7L and the right eye measurement unit 7R) can be moved in the Z direction while maintaining the positional relationship between the concave mirror 85 and the first unit U1 and the second unit U2.

[0079] For example, the moving unit 8 is composed of a Z moving section and a driving section. As an example, the Z moving section may be a slide mechanism that moves the base unit U3 in the Z direction relative to the base 87. In other words, the base unit U3 is connected to the Z moving section, and is moved in the Z direction relative to the base 87 via the movement of the Z moving section. The driving section may include a motor or the like for driving the Z moving section.

[0080] <Control Unit> 6 is a diagram showing a control system of the optometry apparatus 100. The control unit 70 includes a CPU (processor), a RAM, a ROM, and the like. For example, the CPU controls each component in the optometry apparatus 100. For example, the RAM temporarily stores various types of information. For example, the ROM stores various programs, optotypes, initial values, and the like for controlling the operation of the optometry apparatus 100. The control unit 70 may be composed of multiple control units (i.e., multiple processors).

[0081] For example, the control unit 70 is electrically connected to various components such as the monitor 6a, the light source 11, the infrared light source 42, the illumination light source 46, the image sensor 22, the image sensor 52, the detector 57, the display 31, and a non-volatile memory 75 (hereinafter, memory 75). In addition, for example, the control unit 70 is electrically connected to the drive unit of the moving unit 9L, the drive unit of the moving unit 9R, the drive unit of the moving unit 8, the drive mechanism 39, and the like. For example, the memory 75 is a non-transient storage medium that can retain the stored contents even if the power supply is cut off. For example, the memory 75 can be a hard disk drive, a flash ROM, a USB memory, or the like.

[0082] <Control action> The control operation of the optometry apparatus 100 will be described. For example, the first unit U1, the second unit U2, and the base unit U3 are each disposed at a standby position. For example, the standby positions in the X direction of the first unit U1 and the second unit U2 may be positions in the X direction assuming that the subject's eye E has an average interpupillary distance (for example, 64 mm). As an example, the X direction positions may be positions in which the measurement optical axis is disposed at a position 32 mm away from the X center of the optometry apparatus on the left and right. For example, the standby positions in the Y direction of the first unit U1 and the second unit U2 may be positions in the Y direction assuming the height (eye level) of the subject's eye E when the subject's face is fixed to the forehead rest 4 and the chin rest 5. For example, the standby positions in the Z direction of the first unit U1 and the second unit U2 may be positions in the Z direction farthest from the subject's eye in the movable range of the first unit U1 and the second unit U2. For example, the standby position of the base unit U3 in the Z direction may be the position in the Z direction farthest from the subject's eye within the movable range of the base unit U3.

[0083] The examiner instructs the subject to place his / her face against the forehead rest 4 and chin rest 5 and observe the presentation window 3. At this time, the subject's face is fixed, so the subject's eye E is less likely to move in the X, Y, and Z directions. Next, the examiner operates the switch unit 6b to display a fixation target for fixating the subject's eye E on the display 31. As a result, the fixation target is projected onto the subject's eye E.

[0084] The examiner operates the switch section 6b to select a switch for executing auto-alignment for the subject's eye E. The control section 70 controls the imaging section 90, the alignment optical system 40, the observation optical system 50, the moving unit 9L, the moving unit 9R, the moving unit 8, etc. in response to an input signal from the switch section 6b, and moves the first unit U1, the second unit U2, and the base unit U3 to proceed with the auto-alignment. This will be described in detail below.

[0085] <Adjustment in XY directions based on face image (Step S1)> First, the control unit 70 controls the imaging unit 90 in response to an input signal from the switch unit 6b to obtain a facial image including both eyes of the subject. The control unit 70 also moves the first unit U1 and the second unit U2 from the standby position to the initial position D1 based on the facial image of the subject. For example, the initial position D1 of the first unit U1 and the second unit U2 is a position at which alignment with the subject's eye E is started.

[0086] 7 is a diagram for explaining the initial positions D1 of the first unit U1 and the second unit U2, and the initial position T1 of the base unit U3. In FIG. 7, the first unit U1 is illustrated, the second unit U2 is omitted, and each optical member is arranged on a straight line for simplification. For example, the initial positions D1 of the first unit U1 and the second unit U2 in the X direction may be positions in the X direction where at least a part of the pupil can be detected in the anterior eye image of the subject's eye E by moving the base unit U3 (details will be described later). Also, for example, the initial positions D1 of the first unit U1 and the second unit U2 in the Y direction may be positions in the Y direction where at least a part of the pupil can be detected in the anterior eye image of the subject's eye E by moving the base unit U3 (details will be described later).

[0087] The control unit 70 detects the left and right pupil positions by image processing the face image of the subject. The control unit 70 also obtains the number of pixels between the left and right pupils and converts this number of pixels into an actual distance to calculate an approximate interpupillary distance of the subject's eyes.

[0088] For example, a tolerance may be set in advance for the deviation between the approximate interpupillary distance based on the face image of the subject and the average interpupillary distance. If the deviation between the approximate interpupillary distance of the subject's eye and the average interpupillary distance is within the tolerance range, the control unit 70 does not move the first unit U1 and the second unit U2, and stores the standby positions in the X direction of the first unit U1 and the second unit U2 as the initial position D1 in the X direction. If the deviation between the approximate interpupillary distance of the subject's eye and the average interpupillary distance is outside the tolerance range, the control unit 70 moves the first unit U1 and the second unit U2 in the X direction to keep the deviation within the tolerance range. For example, the deviation is kept within the tolerance range by adjusting the distance between the first unit U1 and the second unit U2 in the X direction based on the approximate interpupillary distance of the subject's eye. The positions of the first unit U1 and the second unit U2 in the X direction at this time are stored as the initial position D1 in the X direction.

[0089] Furthermore, the control unit 70 detects whether the pupil positions of the left eye and the right eye in the face image of the subject are within a predetermined area. If the pupil positions of the left eye and the right eye are within the predetermined area, the control unit 70 does not move the first unit U1 and the second unit U2, and stores the standby positions in the Y direction of the first unit U1 and the second unit U2 as the initial positions D1 in the Y direction. If the pupil positions of the left eye and the right eye are outside the predetermined area, the control unit 70 moves the first unit U1 and the second unit U2 in the Y direction to place the pupils within the area. The positions of the first unit U1 and the second unit U2 in the Y direction at this time are stored as the initial positions D1 in the Y direction.

[0090] The standby positions of the first unit U1 and the second unit U2 in the Z direction are used as they are as the initial position D1 in the Z direction. Also, the standby position of the base unit U3 in the Z direction is used as they are as the initial position T1 in the Z direction.

[0091] When the XY direction adjustments based on the subject's facial image as described above are completed, the distance from the subject's eye E to the concave mirror 85 (working distance WD) and the distance wd from the concave mirror 85 to the first unit U1 and the second unit U2 are different distances.

[0092] <Rough alignment in Z direction based on anterior segment image (step S2)> Fig. 8 is a diagram showing changes after step S2 in an anterior-segment image 210 of the subject's eye E and a captured image 220 of the detector 57 of the working distance detection optical system 45. Fig. 8(a) shows the anterior-segment image 210, and Fig. 8(b) shows the captured image 220. Fig. 8 shows only the anterior-segment image 210 and the captured image 220 corresponding to the left eye of the subject's eye E, and does not show the anterior-segment image 210 and the captured image 220 corresponding to the right eye.

[0093] Next, the control unit 70 controls the alignment optical system 40 to project a first alignment index for the XY directions and a second alignment index for the Z direction onto the subject's eye E. In addition, the control unit 70 controls the observation optical system 50 to obtain an anterior eye image 210 of the subject's eye E.

[0094] The control unit 70 moves the base unit U3 in the Z direction until at least a part of the pupil P of the subject's eye E is detected based on the anterior eye image 210 of the subject's eye E (see the anterior eye image 210a in FIG. 8(a)). For example, the base unit U3 is moved in the Z direction until at least a part of the pupil of the left eye is detected in the anterior eye image 210 of the left eye and at least a part of the pupil of the right eye is detected in the anterior eye image 210 of the right eye.

[0095] For example, at this time, the first unit U1 and the second unit U2 are disposed at an initial position D1 in the base unit U3, and are moved in the Z direction together with the base unit U3 without changing the positional relationship between the first unit U1 and the second unit U2 and the base unit U3. In addition, since the XY directions of the first unit U1 and the second unit U2 are adjusted in step S1, at least a part of the pupil is captured in the left and right anterior eye images 210 simply by moving the base unit U3 in the Z direction.

[0096] The control unit 70 does not necessarily need to obtain an anterior-segment image 210 focused on the anterior segment of the subject's eye E, but may move the base unit U3 in the Z direction to an extent that the pupil P can be detected from the anterior-segment image 210. As an example, the base unit U3 may be moved in the Z direction to an extent that a change in luminance appears in the anterior-segment image 210.

[0097] The control unit 70 stops the movement of the base unit U3 when at least a part of the pupil is detected in each of the left and right anterior-segment images 210. This completes the rough alignment in the Z direction based on the anterior-segment images 210 of the subject eye.

[0098] <Rough alignment in XY directions based on anterior eye image (Step S3)> Next, the control unit 70 obtains the pupil center position Pc by circularly approximating the pupils detected from the left and right anterior eye images, and moves the first unit U1 and the second unit U2 in at least one of the X direction and the Y direction so that the pupil center position Pc and the measurement optical axis N approximately coincide (see the anterior eye image 210b in FIG. 8(a)). More specifically, the control unit 70 detects the pupil center position Pc from the anterior eye image 210 of the left eye, and moves the first unit U1 in at least one of the X direction and the Y direction so that the pupil center position Pc of the left eye and the measurement optical axis N for the left eye approximately coincide. Similarly, the control unit 70 detects the pupil center position Pc from the anterior eye image 210 of the right eye, and moves the second unit U2 in at least one of the X direction and the Y direction so that the pupil center position Pc of the right eye and the measurement optical axis N for the right eye approximately coincide. When the pupil center positions Pc in the left and right anterior-segment images 210 coincide with the measurement optical axis N, the control unit 70 stops the movement of the first unit U1 and the second unit U2. This completes rough alignment in the XY directions based on the anterior-segment images 210 of the subject eye.

[0099] <Fine alignment in the Z direction based on the anterior eye image (Step S4)> Next, the control unit 70 moves the base unit U3 in the Z direction until the first alignment index image M1 for the XY direction is detected in the pupils in the left and right anterior eye images 210 (see the anterior eye image 210c in FIG. 8(a)). Here, a case where the first alignment index image M1 is detected in the pupils of both the left eye anterior eye image 210 and the right eye anterior eye image 210 is taken as an example. For example, the control unit 70 may detect the first alignment index image M1 by utilizing a change in luminance of the anterior eye image 210. As a result, the anterior eye image 210 in which the focus is on the anterior eye of the subject's eye E is obtained. Furthermore, when the control unit 70 detects the first alignment index image M1, it stops the movement of the base unit U3. As a result, fine alignment in the Z direction based on the anterior eye image 210 of the subject's eye is completed.

[0100] The control unit 70 may stop the movement of the base unit U3 when the first alignment target image M1 is detected in the pupil of either the left eye anterior segment image 210 or the right eye anterior segment image 210. In this case, for example, an adjustment step described later is subsequently executed.

[0101] Fig. 9 is a diagram for explaining the measurement position D2 of the first unit U1 and the second unit U2, and the measurement position T2 of the base unit U3. In Fig. 9, the first unit U1 is also illustrated, the second unit U2 is omitted, and each optical member is arranged on a straight line for simplification. For example, the measurement position D2 of the first unit U1 and the second unit U2, and the measurement position T2 of the base unit U3 are positions when alignment with the subject's eye E is completed, and are positions where subjective measurement of the subject's eye E can be started.

[0102] The control unit 70 executes steps S2 and S4, so that the base unit U3 gradually moves from the initial position T1 to the measurement position T2. ​​Here, in a state where the first alignment target image M1 is detected in the pupil of the left and right anterior eye images 210, the distance (working distance WD) from the subject's eye E to the concave mirror 85 and the distance wd from the concave mirror 85 to the first unit U1 and the second unit U2 are the same (almost the same). In addition, the optical magnification from the subject's eye E to the concave mirror 85 and the optical magnification from the concave mirror 85 to the first unit U1 and the second unit U2 are the same. This allows the image of the visual target light beam to be projected well onto the subject's eye E.

[0103] In addition, in a state where the first alignment index image M1 is detected in the pupil of the left and right anterior eye images 210, the second alignment index image M2 for the Z direction is reflected in the captured image 220 by the detector 54 of the working distance detection optical system 45 (see captured image 220c in FIG. 8(b)). The control unit 70 detects the second alignment index image M2 from the captured image 220, and moves the first unit U1 and the second unit U2 in the Z direction so that the deviation amount δ between the second alignment index image M2 and the alignment proper position K2 in the Z direction falls within a predetermined allowable range. More specifically, the control unit 70 detects the second alignment index image M2 from the captured image 220 of the left eye, and moves the first unit U1 in the Z direction so that the second alignment index image M2 coincides with the alignment proper position K2 for the left eye. Similarly, the control unit 70 detects a second alignment index image M2 from the captured image 220 of the right eye, and moves the second unit U2 in the Z direction so that the second alignment index image M2 coincides with the alignment proper position K2 for the right eye. When the second alignment index image M2 in the captured images 220 of the left and right eyes coincides with the alignment proper position K2, the control unit 70 stops the movement of the first unit U1 and the second unit U2. This completes fine alignment in the Z direction based on the captured image 220 of the subject's eye.

[0104] After moving the base unit U3 based on the first alignment index image M1, the first unit U1 and the second unit U2 are further moved based on the second alignment index image M2, so that the eye E and the deflection mirror 81 are optically conjugate with each other via the concave mirror 85. In addition, the pupil position of the eye E and the pupil conjugate position of the subjective measurement unit are in a constant positional relationship. At this time, the relationship between the optical magnification at the distance (working distance WD) from the eye E to the concave mirror 85 and the distance wd from the concave mirror 85 to the first unit U1 and the second unit U2 may be slightly broken, and optical aberration may occur. However, such optical aberration is small and can be ignored. Alternatively, a calculation process may be performed to correct the optical aberration based on the optical characteristics of the eye E and the measurement position D2 of the first unit U1 and the second unit U2.

[0105] <Fine alignment in XY directions based on anterior eye image (Step S5)> Next, the control unit 70 moves the first unit U1 and the second unit U2 in the X direction and the Y direction so that the deviations δ1x and δ1y between the first alignment index image M1 and the measurement optical axis N (in other words, the alignment proper position K1 in the XY direction) in the left and right anterior eye images 210 are within a predetermined allowable range (see the anterior eye image 210d in FIG. 8(a)). More specifically, the control unit 70 moves the first unit U1 in at least one of the X direction and the Y direction so that the first alignment index image M1 and the measurement optical axis for the left eye (alignment proper position K2) coincide with each other in the anterior eye image 210 of the left eye. Similarly, the control unit 70 moves the first unit U1 in at least one of the X direction and the Y direction so that the first alignment index image M1 and the measurement optical axis for the right eye (alignment proper position K2) coincide with each other in the anterior eye image 210 of the right eye. When the first alignment target image M1 in the left and right anterior eye images 210 coincides with the measurement optical axis N (alignment proper position K1), the control unit 70 stops the movement of the first unit U1 and the second unit U2. This completes fine alignment in the XY directions based on the anterior eye image 210 of the subject eye.

[0106] In this embodiment, the control unit 70 executes the alignment control of steps S2 to S5 in order, so that the first unit U1 and the second unit U2 gradually move from the initial position D1 to the measurement position D2, and the base unit U3 gradually moves from the initial position T1 to the measurement position T2. ​​For example, the first unit U1, the second unit U2, and the base unit U3 can be moved simultaneously to the measurement position D2 and the measurement position T2 more efficiently than when the alignment is performed while searching for the first alignment index image M1 for the XY direction and the second alignment index image M2 for the Z direction. This is particularly effective in a configuration in which the second alignment index image M2 does not appear in the captured image 220 if the imaging surface of the detector 54 is significantly deviated from the eye E as in this embodiment.

[0107] <Subjective measurement> When the auto-alignment of the subject's eye E is completed, the examiner starts subjective measurement of the subject's eye E. The examiner operates the switch unit 6b to set the correction power for correcting the subject's eye E. As an example, the examiner may select the spherical power, cylindrical power, and astigmatism axis angle for correcting the subject's eye E based on the objective ocular refractive power (objective value) of the subject's eye E. The examiner may also operate the switch unit 6b to check whether the correction power for correcting the subject's eye E is appropriate while switching the visual acuity value of the optotype presented to the subject's eye E. For example, the examiner may ask the subject about the orientation of the optotype, and if the subject answers correctly, the visual acuity value may be switched to one level higher (i.e., a smaller value), and if the subject answers incorrectly, the visual acuity value may be switched to one level lower (i.e., a larger value). If the correction power for correcting the subject's eye E is inappropriate, the correction power may be changed. The examiner repeats these procedures to obtain the subjective ocular refractive power (subjective value) of the examinee's eye E.

[0108] In addition, if the subject's eye E deviates from at least one of the allowable ranges of the alignment proper position K1 and the alignment proper position K1 after the subjective measurement of the subject's eye E is started, the first unit U1 and the second unit U2 may be made to track the subject's eye E. For example, the control unit 70 may move the first unit U1 and the second unit U2 in the X and Y directions so that the deviation between the first alignment index image M1 in the left and right anterior eye images 210 and the measurement optical axis N (the alignment proper position K1 in the XY directions) becomes zero, and may move the first unit U1 and the second unit U2 in the Z direction so that the deviation between the second alignment index image M2 in the left and right captured images 220 and the alignment proper position K2 in the Z direction becomes zero. This makes it possible to accommodate fast movements of the subject's eye E.

[0109] As described above, for example, the subjective ophthalmology device in this embodiment includes a first coarse alignment step in which the base measurement unit is moved in the front-rear direction to perform coarse alignment of the subject's eye in the front-rear direction until at least a part of the left and right pupils are detected in the anterior eye image of the subject's eye, and a second coarse alignment step in which, after the first coarse alignment step, the left eye measurement unit is moved in at least one of the left-right direction and the up-down direction so that the pupil of the subject's eye coincides with the first optical axis of the left eye projection optical system, and the right eye measurement unit is moved in at least one of the left-right direction and the up-down direction so that the pupil of the subject's eye coincides with the second optical axis of the right eye projection optical system. a first fine alignment step of performing fine alignment of the subject's eye in the front-back direction by moving the base measurement unit in the front-back direction after performing the second coarse alignment step until an alignment index is detected in at least one of the left and right pupils of the subject's eye, and a second fine alignment step of performing fine alignment of the subject's eye in the front-back direction by moving the left eye measurement unit in at least one of the left and right direction and the up-down direction after performing the first fine alignment step so that the alignment index and the first optical axis coincide with each other, and moving the right eye measurement unit in at least one of the left and right direction and the up-down direction so that the alignment index and the second optical axis coincide with each other. For example, this allows the alignment of the subject's eye to be efficiently performed. In addition, the positions of the left eye measurement unit and the right eye measurement unit can be adjusted while maintaining a specified relationship between the distance from the test eye E to the fixed optical member (working distance WD) and the distance from the fixed optical member to the left eye measurement unit and the right eye measurement unit (distance wd), thereby minimizing changes in optical magnification accompanying movement of the base measurement unit and the occurrence of optical aberration accompanying movement of the left eye measurement unit and the right eye measurement unit, and the optical characteristics of the test eye can be measured accurately.

[0110] In addition, for example, in the first fine alignment step, the subjective optometry device in this embodiment moves the base measurement unit in the front-rear direction until an XY alignment index is detected in at least one of the left and right pupils in the anterior eye image, and further moves the left eye measurement unit in the front-rear direction based on the focus state of the Z alignment index, and moves the right eye measurement unit in the front-rear direction based on the focus state of the Z alignment index. For example, when the XY alignment index of the anterior eye image by the first alignment index projecting optical system (front projection optical system 41) is used, the focus state in the Z direction can be detected by utilizing the change in focus of the XY alignment index image. On the other hand, for example, when the Z alignment index of the captured image by the second alignment index projecting optical system (working distance detection optical system 45) is used, the focus state in the Z direction can be detected by utilizing the change in the position of the Z alignment index image. Therefore, for example, if the base measurement unit is moved in the forward / backward direction based on the focus state of the Z alignment index rather than moving the base measurement unit in the forward / backward direction based on the focus state of the XY alignment index projected onto the test eye, it is easier to grasp the accurate focus state in the Z direction, and the alignment accuracy can be further improved.

[0111] <Example of transformation> In this embodiment, an example has been described in which, in alignment control of the test eye E, control of the next step is started after control of the current step is completed (i.e., after the movement of each unit is stopped in the current step). However, alignment control of the test eye E may be started in the next step after control of the current step is started, but before the movement of each unit is stopped in the current step. In other words, the next step may be executed with a partial overlap while the current step is being executed. This can further reduce the time required for alignment control of the test eye E.

[0112] In this embodiment, a case has been described in which fine alignment in the Z direction and the XY direction (steps S4 and S5) is performed after rough alignment in the Z direction and the XY direction (steps S2 and S3) is performed based on the anterior eye image 210 of the subject's eye E. However, for example, in the rough alignment in the XY direction (step S3), the actual pupil center position Pc and the measurement optical axis N do not necessarily coincide with each other depending on the corneal shape of the subject's eye E. For example, in this case, in the subsequent fine alignment in the Z direction (step S4), it may be difficult to detect the first alignment target image M1 from the anterior eye image 210, and the alignment of the subject's eye may not be efficiently performed.

[0113] Therefore, the control unit 70 may perform two-stage rough alignment in each of the Z direction and the XY direction based on the anterior eye image 210 of the subject's eye E. More specifically, the control unit 70 may perform a first-stage rough alignment in the Z direction and the XY direction (steps S2 and S3) by detecting the pupil P from the anterior eye image 210, and further perform a second-stage rough alignment in the Z direction and the XY direction by detecting a second alignment target image for the Z direction from the anterior eye image 210. Moreover, the control unit 70 may perform fine alignment in the Z direction and the XY direction (steps S4 and S5) after performing such two-stage rough alignment.

[0114] The first stage rough alignment is similar, so it will be omitted below, and the second stage rough alignment will be explained. Here, step S2, which is the first stage rough alignment in the Z direction, is referred to as step S2-A, and step S3, which is the first stage rough alignment in the X and Y directions, is referred to as step S3-A. In addition, the second stage rough alignment in the Z direction is referred to as step S2-B, and the second stage rough alignment in the X and Y directions is referred to as step S3-B.

[0115] 10 is an example of an anterior eye image 210 of the subject's eye E. For example, a first alignment index for the XY directions and a second alignment index for the Z direction are projected onto the subject's eye E in step S2-A. After moving each unit in the processes of step S2-A and step S3-A, the control unit 70 subsequently executes step S2-B. For example, in step S2-B, the control unit 70 moves the base unit U3 in the Z direction until an image of the second alignment index for the Z direction is detected in the pupil of the anterior eye image 210.

[0116] For example, even if the actual pupil center position Pc of the subject's eye E is misaligned with the measurement optical axis N at this point, in the working distance detection optical system 45 which projects detection light from an oblique direction onto the subject's eye E, the second alignment index image M2' is less likely to be vignetted and is reflected in the anterior eye image 210. On the other hand, in the front projection optical system 41 which projects infrared light from the front direction of the subject's eye E, the first alignment index image M1 is vignetted and is not reflected in the anterior eye image 210. Note that, when the actual pupil center position Pc of the subject's eye E and the measurement optical axis N are roughly aligned, the first alignment index image M1 is reflected by further moving the base unit U3 in the Z direction.

[0117] When the control unit 70 detects the second alignment target image M2', it stops the movement of the base unit U3, thereby completing the second stage of rough alignment in the Z direction based on the anterior eye image 210 of the subject's eye.

[0118] Next, the control unit 70 executes step S3-B. For example, the control unit 70 moves the first unit U1 and the second unit U2 in the X direction and the Y direction so that the amount of deviation between the second alignment index image M2' in the anterior eye image 210 and the measurement optical axis N (alignment proper position K1 in the XY direction) falls within a predetermined allowable range. Also, for example, when the second alignment index image M2' in the anterior eye image 210 coincides with the measurement optical axis N (alignment proper position K1), the control unit 70 stops the movement of the first unit U1 and the second unit U2. This completes the second-stage rough alignment in the XY direction based on the anterior eye image 210 of the subject's eye.

[0119] For example, even if the actual pupil center position Pc of the subject's eye E is misaligned with the measurement optical axis N, the actual pupil center position Pc approaches the measurement optical axis N by performing steps S2-B and S3-B and aligning the measurement optical axis N with the second alignment index image M2'. In addition, on the anterior eye image 210, the first alignment index image M1 appears around the second alignment index image M2' due to the design of the working distance detection optical system 45 and the front projection optical system 41. Therefore, when the control unit 70 moves the base unit U3 in the Z direction in step S4, the first alignment index image M1 for the XY directions is easily detected without being vignetted.

[0120] In this way, the subjective eye examination device of this embodiment may perform a first coarse alignment step (step S2-A) and a second coarse alignment step (step S3-A) in the first stage, and then perform a first coarse alignment step (step S2-B) in the second stage in which coarse alignment of the test eye in the anterior-posterior direction is performed by moving the base measurement unit in the anterior-posterior direction until an alignment index is detected in at least one of the left and right pupils in the anterior eye image, and further perform a second coarse alignment step (step S3-B) in the second stage in which coarse alignment of the test eye in the lateral direction and the vertical direction is performed by moving the measurement unit for the left eye in at least one of the lateral direction and the vertical direction based on the alignment index in the anterior eye image so that the alignment index and the first optical axis coincide, and by moving the measurement unit for the right eye in at least one of the lateral direction and the vertical direction so that the alignment index and the second optical axis coincide. This allows the alignment of the subject's eye to proceed more efficiently.

[0121] In this embodiment, in the Z-direction fine alignment based on the anterior eye image 210 of the subject's eye E (step S4), the first alignment index image M1 is detected in both the pupils of the anterior eye image 210 of the left eye and the anterior eye image 210 of the right eye by moving the base unit U3 in the Z direction relative to the subject's eye E. However, if there is a misalignment in the front-back direction between the left eye and the right eye, such as when the subject's face is fixed at an angle, the first alignment index image M1 may be detected only in either the pupil of the anterior eye image 210 of the left eye or the anterior eye image 210 of the right eye by only moving the base unit U3 in the Z direction relative to the subject's eye E. For this reason, the control unit 70 may execute an adjustment step after executing step S4. For example, the adjustment step is executed only for the left eye and the right eye in which the first alignment index image M1 cannot be detected in the pupil of the anterior eye image 210.

[0122] In this embodiment, in step S4, the base unit U3 is moved in the Z direction until the first alignment index image M1 is detected in the pupil of the anterior eye image 210 of the left eye. For example, the control unit 70 moves only the second unit U2 in the Z direction until the first alignment index image M1 is detected in the pupil of the anterior eye image 210 of the right eye. In addition, when the control unit 70 detects the first alignment index image M1, it stops the movement of the second unit U2. For example, this causes the first alignment index image M1 to be detected in the pupils of both the anterior eye image 210 of the left eye and the anterior eye image 210 of the right eye. For example, the control unit 70 may perform such an adjustment step as necessary and then perform fine alignment in the XY direction based on the anterior eye image 210 (step S5).

[0123] In this way, in the subjective optometry device of this embodiment, when an alignment index is detected only in one of the left and right pupils by the first fine alignment step, the left eye measurement unit or the right eye measurement unit is moved in the front-back direction until the alignment index is detected in the other of the left and right pupils after the first fine alignment step, and an adjustment step is performed to adjust so that the alignment index is detected in both the left and right pupils, and after the adjustment step, a second fine alignment step is performed. For example, when there is a difference in the front-back position of the left eye and the right eye, such as when the subject's face is facing diagonally, the alignment index of one eye is not detected even if the base measurement unit is moved in the Z direction, so that in the subsequent second fine alignment step, it becomes difficult to move the left eye measurement unit (or the right eye measurement unit) in at least one of the left and right directions and the up and down directions so that the alignment index and the first optical axis (or the second optical axis) coincide with each other. However, for example, by inserting such an adjustment step, the alignment of the subject's eye can be efficiently advanced. [Explanation of symbols]

[0124] 7 Measuring part 10 Objective Measuring Optical System 25 Subjective Measuring Optical System 70 Control section 75 Memory 81 Deflection Mirror 84 Reflective Mirror 85 Concave Mirror 100 Self-examination device

Claims

1. a projection optical system that projects a target light beam toward the subject's eye; a corrective optical system that changes the optical characteristics of the target light beam; a fixed optical member fixedly disposed in an optical path of the light projection optical system, the fixed optical member being for optically presenting an image of the visual target light beam to the subject's eye at a predetermined test distance; and A subjective ophthalmological examination device for subjectively measuring optical characteristics of the subject's eye, the light projection optical system includes a left-eye light projection optical system and a right-eye light projection optical system, an alignment target projection means for projecting an alignment target onto the subject's eye; an anterior ocular segment image acquiring means for acquiring an anterior ocular segment image by photographing an anterior ocular segment of the subject's eye; a first moving means for aligning a first optical axis of the left-eye projection optical system with the left eye by moving a left-eye measurement unit including the left-eye projection optical system with respect to the fixed optical member; a second moving means for aligning a second optical axis of the right-eye projection optical system with the right eye by moving a right-eye measurement unit including the right-eye projection optical system relative to the fixed optical member; a third moving means for projecting an image of the visual target light beam onto each of the left eye and the right eye at a predetermined optical magnification by integrally moving a base measurement unit including the left eye measurement unit, the right eye measurement unit, and the fixed optical member relative to both eyes; an alignment control means for controlling the driving of at least one of the first moving means and the second moving means to move the left eye measurement unit relative to the left eye and the right eye measurement unit relative to the right eye, and for controlling the driving of the third moving means to move the base measurement unit relative to both eyes, thereby aligning the subject's eyes; Equipped with The alignment control means a first coarse alignment step of controlling the driving of the third moving means based on the anterior eye image acquired by the anterior eye image acquiring means, and moving the base measurement unit in the anterior-posterior direction until at least a portion of the left and right pupils is detected in the anterior eye image, thereby performing coarse alignment of the subject's eye in the anterior-posterior direction; a second coarse alignment step of performing coarse alignment of the subject's eye in the left-right direction and the up-down direction by controlling the driving of the first moving means based on the position of the pupil in the anterior-segment image, and moving the left-eye measurement unit in at least one of the left-right direction and the up-down direction so that the pupil and the first optical axis coincide with each other, and controlling the driving of the second moving means based on the position of the pupil in the anterior-segment image, and moving the right-eye measurement unit in at least one of the left-right direction and the up-down direction so that the pupil and the second optical axis coincide with each other, and a first fine alignment step of controlling the driving of the third moving means after the second coarse alignment step, and moving the base measurement unit in the front-back direction until the alignment index is detected in at least one of the left and right pupils in the anterior eye image, thereby performing fine alignment of the subject's eye in the front-back direction; a second fine alignment step of performing fine alignment of the subject's eye in the left-right direction and the up-down direction by controlling the driving of the first moving means based on the alignment index in the anterior eye image, moving the left eye measurement unit in at least one of the left-right direction and the up-down direction so that the alignment index and the first optical axis coincide with each other, and controlling the driving of the second moving means based on the alignment index in the anterior eye image, moving the right eye measurement unit in at least one of the left-right direction and the up-down direction so that the alignment index and the second optical axis coincide with each other; A subjective optometry device characterized by performing the above.

2. The subjective ophthalmological examination device of claim 1, The alignment control means When the alignment indicator is detected in only one of the left and right pupils by the first fine alignment step, After the first fine alignment step is performed, an adjustment step is performed in which the driving of the first moving means or the second moving means is controlled to move the left eye measurement unit or the right eye measurement unit in a forward / backward direction until the alignment index is detected in the other of the left and right pupils, thereby making an adjustment so that the alignment index is detected in both the left and right pupils; The subjective optometry apparatus is characterized in that the second fine alignment step is performed after the adjustment step is performed.

3. The subjective ophthalmological examination device of claim 1, the alignment index projection means includes a first alignment index projection means for projecting XY alignment indexes for left-right and up-down directions onto the subject's eye, and a second alignment index projection means for projecting a Z alignment index for a front-back direction onto the subject's eye, The alignment control means In the first fine alignment step, the base measurement unit is moved in a front-to-rear direction until the XY alignment index is detected in at least one of the left and right pupils in the anterior eye image; moreover, A subjective ophthalmological examination device characterized in that the measurement unit for the left eye is moved in the forward and backward directions based on the focus state of the Z alignment index, and the measurement unit for the right eye is moved in the forward and backward directions based on the focus state of the Z alignment index.

4. In the subjective ophthalmological examination device according to any one of claims 1 to 3, the corrective optical system includes a corrective optical system for a left eye and a corrective optical system for a right eye, the measurement unit for the left eye includes the projection optical system for the left eye and the correction optical system for the left eye, the right-eye measurement unit includes the right-eye correction optical system together with the right-eye projection optical system, the fixed optical member guides the visual target light beam corrected by the left-eye corrective optical system toward the left eye, and guides the visual target light beam corrected by the right-eye corrective optical system toward the right eye.

Images