Ophthalmologic apparatus and ophthalmologic apparatus control program

Abstract

To provide an ophthalmologic apparatus and an ophthalmologic apparatus control program capable of efficiently adjusting a relative position between an eye to be examined and an optometric unit.SOLUTION: When fine movement operation for finely moving an operation unit to the operation unit is detected by an operation detection unit, a control part finely moves a position of an optometric unit within a fine movement range by controlling a driving part in response to the detected fine movement operation. When coarse movement operation for coarsely moving the operation unit to the operation unit is detected by the operation detection unit, the control part coarsely moves the position of the optometric unit by controlling the driving part in response to the detected coarse movement. The control part causes a fine movement range of the optometric unit with respect to the eye to be examined in which the fine movement is enabled by the fine movement operation to be displayed on a captured image that is captured by an imaging optical system and displayed in a display part.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to an ophthalmic apparatus for examining an eye to be examined and an ophthalmic apparatus control program. [Background technology]

[0002] There are various ophthalmic devices for examining a subject's eye (e.g., an eye refractive power measuring device, a corneal curvature measuring device, an intraocular pressure measuring device, a fundus camera, an OCT device, a scanning laser ophthalmoscope (SLO), etc.). Examination of the subject's eye using many ophthalmic devices needs to be performed with the relative position between the subject's eye and an ophthalmology unit adjusted to an appropriate position.

[0003] There is also known an ophthalmic device capable of performing fine and coarse movement of at least a part of the device in order to efficiently adjust the relative position between the subject's eye and the optometry unit. Fine movement refers to moving at least a part of the device by a small amount (or slowly) in order to finely adjust the relative position. Coarse movement refers to moving at least a part of the device by a large amount (or faster) than the fine movement in order to roughly adjust the relative position.

[0004] For example, the ophthalmic device described in Patent Document 1 finely moves the eye examination unit when the operating stick is tilted within a certain tilt range, and coarsely moves the eye examination unit when the push button on the top of the operating stick is operated. There are also known ophthalmic devices that finely move the eye examination unit if the tilt range of the operating stick is within a predetermined range, and coarsely move the eye examination unit if the tilt range of the operating stick exceeds the predetermined range. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-23960 A Summary of the Invention [Problem to be solved by the invention]

[0006] In an ophthalmic device capable of both fine and coarse movements, the range in which the optometry unit can be finely moved (fine movement range) is often limited. Therefore, even if the optometry unit is finely moved to the limit of the fine movement range, the movement distance by the fine movement may be insufficient. In this case, in a conventional ophthalmic device, it is necessary to interrupt the fine movement, redo the position adjustment by the coarse movement, and then perform the position adjustment by the fine movement again. As a result, the effort of switching between the coarse movement and the fine movement increases. Therefore, a technology for more efficiently adjusting the relative position between the subject's eye and the optometry unit is desired.

[0007] A typical object of the present invention is to provide an ophthalmic apparatus and an ophthalmic apparatus control program capable of efficiently adjusting the relative position between an eye to be examined and an ophthalmic examination unit. [Means for solving the problem]

[0008] An ophthalmologic apparatus provided by a typical embodiment of the present disclosure includes an optometry unit that examines an eye to be examined with an examination axis aligned with the eye to be examined, a drive unit that moves a relative position of the optometry unit with respect to the eye to be examined, an operation unit that is operated by an examiner to drive the drive unit, an operation detection unit that detects an operation of the operation unit, an imaging optical system that images the eye to be examined, and a control unit, and when the operation detection unit detects that a fine movement operation for finely moving the optometry unit has been performed on the operation unit, the control unit responds to the detected fine movement operation by a fine movement step of finely moving a position of the eye examination unit within a fine movement range by controlling the driving unit in response to the operation detection unit; a coarse movement step of coarsely moving a position of the eye examination unit by controlling the driving unit in accordance with the detected coarse movement operation when the operation detection unit detects that a coarse movement operation for coarsely moving the eye examination unit has been performed on the operation unit; and a fine movement range display step of displaying the fine movement range of the eye examination unit relative to the subject's eye, which can be finely moved by the fine movement operation, on an image captured by the imaging optical system and displayed on a display unit.

[0009] An ophthalmic apparatus control program provided by a typical embodiment of the present disclosure is an ophthalmic apparatus control program for controlling an ophthalmic apparatus, the ophthalmic apparatus including an ophthalmic examination unit that examines the subject's eye with an examination axis aligned with the subject's eye, a drive unit that moves a relative position of the ophthalmic examination unit with respect to the subject's eye, an operation unit operated by an examiner to drive the drive unit, an operation detection unit that detects an operation of the operation unit, an imaging optical system that images the subject's eye, and a control unit, and the ophthalmic apparatus control program is executed by the control unit, and the operation detection unit detects that a fine movement operation for finely moving the ophthalmic examination unit has been performed on the operation unit. When the operation detection unit detects that a coarse movement operation for coarsely moving the eye examination unit has been performed on the operation unit, the ophthalmic device executes the following steps: a fine movement step of finely moving a position of the eye examination unit within a fine movement range by controlling the drive unit in accordance with the detected fine movement operation; when the operation detection unit detects that a coarse movement operation for coarsely moving the eye examination unit has been performed on the operation unit, the coarse movement step of coarsely moving the position of the eye examination unit by controlling the drive unit in accordance with the detected coarse movement operation; and a fine movement range display step of displaying the fine movement range of the eye examination unit relative to the subject's eye, which can be finely moved by the fine movement operation, on an image captured by the imaging optical system and displayed on a display unit.

[0010] According to the ophthalmic apparatus and the ophthalmic apparatus control program according to the present disclosure, the relative position between the subject's eye and the optometric examination unit is efficiently adjusted. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a right side view showing the appearance of the ophthalmologic apparatus 1. [Diagram 2] 2 is a diagram showing an optical system and a control system of the ophthalmic apparatus 1. FIG. [Diagram 3] 2 is a perspective view of the operation unit 60 as seen obliquely from the right rear. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 3. [Diagram 5]5 is a diagram showing a state in which the operating stick 61 is tilted beyond a predetermined range in the +X direction from the state shown in FIG. 4. FIG. [Figure 6] 13 is a flowchart of a relative position adjustment process executed by the ophthalmologic apparatus 1. [Figure 7] 11 is a diagram showing an example of a transition of the display of a fine movement range 100 displayed on a captured image. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Summary> The ophthalmic device exemplified in the present disclosure includes an eye examination unit, a drive unit, an operation unit, an operation detection unit, an imaging optical system, and a control unit. The eye examination unit examines the eye to be examined with an examination axis aligned with the eye to be examined. The drive unit moves the relative position of the eye examination unit with respect to the eye to be examined. The operation unit is operated by an examiner to drive the drive unit. The operation detection unit detects the operation of the operation unit. The imaging optical system captures the eye to be examined. The control unit executes a fine movement step, a coarse movement step, and a fine movement range display step. In the fine movement step, when the operation detection unit detects that a fine movement operation for finely moving the eye examination unit has been performed on the operation unit, the control unit controls the drive unit in accordance with the detected fine movement operation to finely move the position of the eye examination unit within the fine movement range. In the coarse movement step, when the operation detection unit detects that a coarse movement operation for coarsely moving the eye examination unit has been performed on the operation unit, the control unit controls the drive unit in accordance with the detected coarse movement operation to coarsely move the position of the eye examination unit. In the fine movement range display step, the control unit displays the fine movement range of the eye examination unit relative to the subject's eye, which can be finely moved by a fine movement operation, on a captured image captured by the imaging optical system and displayed on the display unit.

[0013] As described above, fine movement refers to moving the optometry unit less (or slower) than in coarse movement in order to finely adjust the relative position between the subject's eye and the optometry unit, whereas coarse movement refers to moving the optometry unit more (or faster) than in fine movement in order to roughly adjust the relative position between the subject's eye and the optometry unit.

[0014] In the ophthalmic device according to the present disclosure, the examiner can appropriately determine whether or not it is possible to complete alignment (i.e., adjustment of the relative position between the subject's eye and the optometry unit) within the fine movement range by checking the fine movement range displayed on the captured image. Therefore, the examiner can perform position adjustment by coarse movement until alignment can be completed within the fine movement range while checking the fine movement range displayed on the captured image, and then perform position adjustment by fine movement. As a result, the frequency of performing position adjustment by fine movement again after interrupting fine movement and redoing position adjustment by coarse movement decreases. Therefore, the relative position between the subject's eye and the optometry unit can be adjusted more efficiently.

[0015] The technology exemplified in the present disclosure can be applied to various ophthalmic devices for performing examination of a subject's eye (e.g., photographing the subject's eye, measuring the ocular characteristics of the subject's eye, observing the subject's eye (including observation for surgery or treatment), etc.). For example, ophthalmic devices for photographing the subject's eye include an OCT device, a laser scanning ophthalmoscope (SLO), a fundus camera, a goniometer, and a corneal endothelial cell imager (CEM), etc. Examples of ophthalmic devices for measuring the ocular characteristics of the subject's eye include an ocular refractive power measuring device, a corneal shape measuring device, an axial length measuring device, and an intraocular pressure measuring device, etc. In addition, the technology exemplified in the present disclosure may be adopted in ophthalmic devices such as a photocoagulator, a YAG laser surgery device, and a slit lamp for performing surgery or treatment on the tissue of the subject's eye while observing the subject's eye.

[0016] A specific method of the fine movement step can be appropriately selected. For example, a manipulation stick supported so as to be tiltable in any direction may be used as the manipulation unit (fine movement manipulation unit) that the examiner manipulates to input a fine movement instruction. The control unit may finely move the eye examination unit in the same direction as the tilt direction of the manipulation stick so that the tilt position of the manipulation stick and the moving distance of the eye examination unit are proportional. The control unit may finely move the eye examination unit in response to the tilt operation of the manipulation stick so that the tilt position of the manipulation stick and the position of the eye examination unit correspond to each other. When a manipulation stick is used as the fine movement manipulation unit, the manipulation stick may be tiltable within a predetermined tilt range. In this case, the fine movement range of the eye examination unit that can be finely moved by the fine movement operation (tilt operation) may correspond to the tilt position of the manipulation stick that can be tilted within the tilt range. The tilt position of the manipulation stick changes according to the tilt angle. Therefore, the control according to the tilt position of the control stick includes control for finely moving the eye examination unit according to the tilt angle of the control stick. In addition, a configuration other than the control stick (for example, a slidable member or a trackball) may be used as a fine movement operation unit for inputting a fine movement operation instruction.

[0017] In addition, a specific control method for coarsely moving the optometry unit may be appropriately selected. For example, an operation unit (hereinafter, referred to as a "coarse movement operation unit") operated by the examiner to input an instruction for fine movement may be used. When it is detected that the coarse movement operation unit has been operated, the control unit may coarsely move the optometry unit in a direction corresponding to the direction in which the coarse movement operation unit has been operated. Various configurations may be adopted for the coarse movement operation unit. For example, a slidable ring-shaped member arranged to surround the outer periphery of the operation stick may be used as the coarse movement operation unit. In addition, slidable members, buttons, knobs, trackballs, and the like of various shapes may be used as the coarse movement operation unit. In addition, when a tilt operation of the operation stick exceeding a predetermined range is detected, the control unit may coarsely move the optometry unit in a direction corresponding to the direction in which the operation stick has been tilted. In this case, the operation stick may serve as both the fine movement operation unit and the coarse movement operation unit.

[0018] The control unit may further execute a fine-motion range changing step of changing the size of the fine-motion range that can be fine-moved by the fine-motion operation according to an instruction input by the examiner. In the fine-motion range display step, the control unit may change the size of the fine-motion range to be displayed on the captured image according to the fine-motion range changed in the fine-motion range changing step. In this case, the examiner can change the size of the fine-motion range in which the optometry unit can be fine-moved by the fine-motion operation to a desired range. Furthermore, when the fine-motion range is changed, the changed fine-motion range is displayed on the captured image. Therefore, even when the fine-motion range is changed, the examiner can appropriately determine whether or not it is possible to complete the alignment within the changed fine-motion range. This makes it easier to adjust the relative position between the examinee's eye and the optometry unit more efficiently.

[0019] A specific method for changing the fine-motion range can be selected as appropriate. For example, the control unit may change the fine-motion range by changing the fine-motion amount of the optometry unit relative to the unit amount of the executed fine-motion operation in response to an instruction input by the examiner. In this case, the fine-motion range changes as the fine-motion speed of the optometry unit changes. Therefore, even if the operation amount of the fine-motion operation is limited (for example, if the tilt angle of the operation stick is limited to a certain angle range), the fine-motion range changes appropriately. It is also possible to change the fine-motion range while keeping the fine-motion amount of the optometry unit relative to the unit amount of the fine-motion operation constant.

[0020] In the fine-motion range display step, the control unit may move the position of the fine-motion range displayed on the captured image according to the position of the optometry unit finely moved within the fine-motion range in a direction intersecting the examination axis. In this case, the examiner can properly grasp in which direction and by how far the optometry unit can be finely moved among the directions intersecting the examination axis by checking the fine-motion range displayed on the captured image. This makes it easier to adjust the relative position between the subject's eye and the optometry unit more efficiently.

[0021] In detail, in the fine-motion range display step, the control unit may move the position of the fine-motion range displayed on the captured image by a distance corresponding to the fine-motion distance in a direction opposite to the movement direction of the optometry unit fine-moved within the fine-motion range in a direction intersecting the examination axis of the optometry unit. In this case, the direction and distance by which the optometry unit can be fine-moved in the direction intersecting the examination axis can be appropriately grasped from the position of the fine-motion range displayed on the captured image.

[0022] Also, a case is assumed in which the photographing position by the photographing optical system changes with the movement of the optometry unit in a direction intersecting the photographing optical axis. In this case, when the optometry unit is slightly moved in a direction intersecting the photographing optical axis with the subject's eye being completely fixed, the photographing position of the subject's eye changes with the slight movement of the optometry unit, but the slight movement range displayed on the photographed image may be moved so that the relative positions of the subject's eye shown in the photographed image and the slight movement range displayed on the photographed image continue to match.

[0023] The operation unit may include a manipulation stick supported so as to be tiltable in any direction as a fine-motion operation part for finely moving the optometry unit. In the fine-motion range display step, the control unit may move the position of the fine-motion range displayed on the captured image according to the tilt position (which may be the tilt angle) within the tilt range of the manipulation stick. In this case, when the manipulation stick is tilted within the tilt range, the optometry unit is finely moved within the fine-motion range. As the manipulation stick is tilted and the optometry unit is finely moved, the position of the fine-motion range displayed on the captured image moves. Therefore, by checking the fine-motion range displayed on the captured image, the examiner can appropriately grasp in which direction and by how far the optometry unit can be finely moved among the directions intersecting the examination axis.

[0024] When the operation stick is tilted within a certain tilt range, the fine movement range of the eye examination unit is determined according to the tilt range of the operation stick and the fine movement amount of the eye examination unit relative to the unit amount of the tilt operation performed (i.e., the fine movement speed). In the fine movement range display step, the control unit may set the size of the fine movement range to be displayed on the captured image according to the tilt range of the operation stick and the fine movement speed of the eye examination unit. In addition, in the fine movement range display step, the control unit may move the position of the fine movement range to be displayed on the captured image by a distance corresponding to the amount of movement of the tilt in the direction opposite to the tilt direction of the operation stick tilted within the tilt range. In this case, the direction and distance by which the operation stick can be tilted (i.e., the direction and distance by which the eye examination unit can be finely moved) are appropriately grasped by the position of the fine movement range displayed on the captured image. As described above, the control according to the amount of movement of the tilt position of the operation stick also includes the case where control is performed according to the amount of change in the tilt angle of the operation stick.

[0025] In the fine-motion range display step, the control unit may change the size of the fine-motion range displayed on the captured image according to the display magnification of the captured image captured by the imaging optical system and displayed on the display unit. In this case, the examiner can appropriately determine whether or not alignment can be completed within the fine-motion range by checking the fine-motion range displayed on the captured image, regardless of the display magnification of the captured image.

[0026] For example, the control unit may increase the fine movement range displayed on the captured image as the display magnification of the subject's eye by the photographing optical system increases. The control unit may decrease the fine movement range displayed on the captured image as the display magnification of the subject's eye by the photographing optical system decreases. The control unit may change the display magnification of the captured image displayed on the display unit by changing the photographing magnification of the subject's eye by the photographing optical system. Furthermore, regardless of whether the photographing magnification of the photographing optical system is changeable, the display magnification of the captured image displayed on the display unit may be changed. In this case, the examiner may input an instruction to change the display magnification of the captured image to the ophthalmic apparatus by operating an operation unit (e.g., a touch panel or a button). The control unit may change the display magnification of the captured image and change the size of the fine movement range displayed on the captured image in response to the instruction to change the display magnification input by the examiner.

[0027] The optometry unit may be provided with an imaging optical system in which the imaging magnification of the subject's eye changes depending on the distance between the optometry unit and the subject's eye. In the fine movement range display step, the control unit may change the size of the fine movement range displayed on the captured image depending on the position of the optometry unit in the direction along the examination axis. In this case, when the optometry unit moves in the direction along the examination axis, the distance between the optometry unit and the subject's eye changes. When the distance between the optometry unit and the subject's eye changes, the imaging magnification of the subject's eye by the imaging optical system changes. Therefore, by changing the size of the fine movement range displayed on the captured image depending on the position of the optometry unit in the direction along the examination axis, it becomes easier to more appropriately determine whether alignment can be completed within the fine movement range.

[0028] For example, the control unit may increase the fine movement range displayed on the captured image as the position of the eye examination unit in the direction along the examination axis moves closer to the subject's eye.The control unit may decrease the fine movement range displayed on the captured image as the position of the eye examination unit in the direction along the examination axis moves away from the subject's eye.Note that, in a case where the imaging magnification of the imaging optical system is changeable with the distance between the imaging optical system and the subject's eye fixed, the control unit may change the size of the fine movement range displayed on the captured image according to the imaging magnification of the imaging optical system.

[0029] However, a telecentric optical system that captures an image of the subject's eye at the same magnification regardless of the distance from the subject's eye may be used as the imaging optical system. In this case, even if the position of the eye examination unit changes in the direction along the examination axis, it is not necessary to change the size of the fine movement range displayed on the captured image.

[0030] <Embodiment> A typical embodiment according to the present disclosure will be described below with reference to the drawings. The ophthalmic device 1 of this embodiment examines the subject's eye E in a state where the relative position between the subject's eye E and the ophthalmic device 1 is adjusted to an appropriate position (for example, in a state where the examination axis is aligned with the subject's eye E). The ophthalmic device 1 illustrated in this embodiment is an ophthalmic refraction measuring device that measures the ocular refraction of the subject's eye E. However, the ophthalmic device 1 may be a device that performs an examination other than the measurement of ocular refraction (for example, an OCT device, a laser scanning ophthalmoscope (SLO), a fundus camera, a goniometer, a corneal endothelial cell imager (CEM), a corneal curvature measuring device, an intraocular pressure measuring device, or an axial length measuring device). In the following description, the optical axis direction of the light used in the examination (i.e., the direction along the examination axis) is the Z-axis direction (front-back direction), the horizontal direction perpendicular to the Z-axis direction is the X-axis direction (left-right direction), and the direction perpendicular to both the Z-axis and the X-axis is the Y-axis direction (up-down direction).

[0031] (Schematic configuration) A schematic configuration of an ophthalmic device 1 will be described with reference to FIG. 1. The ophthalmic device 1 of this embodiment includes a housing 3, a base 5, a face support section 9, an eye examination unit 2, an operation unit 60, a drive section 4, a control section 50, and a display section 8. The housing 3 includes the base 5 and various components of the ophthalmic device 1 (for example, the eye examination unit 2, the drive section 4, and the control section 50). The base 5 of the housing 3 supports the entire ophthalmic device 1. The face support section 9 supports the face of the subject. The face support section 9 of this embodiment includes a chin rest on which the subject's chin is placed, and a forehead rest on which the subject's forehead is placed. Note that the face support section 9 of this embodiment is provided on the base 5, but the face support section 9 may be provided independently of the base 5.

[0032] The eye examination unit 2 examines the subject's eye E. The eye examination unit 2 may include a configuration (an optical system in this embodiment) for performing at least one of the examinations of the eye E's refractive power, corneal curvature, and intraocular pressure. The eye examination unit 2 may also include an optical system for photographing the tissue of the subject's eye. The drive unit 4 moves the eye examination unit 2 in up / down, left / right, front / rear directions (three-dimensional directions) relative to the base 5 to move the relative position between the subject's eye E and the eye examination unit 2. The drive unit 4 may move the face support part 9 together with the eye examination unit 2 or instead of the eye examination unit 2 to move the relative position between the subject's eye E and the eye examination unit 2. The operation unit 60 is disposed on the side of the housing 3 opposite to the side where the subject is located (i.e., the side where the examiner is located). The operation unit 60 is operated by the examiner to input an instruction to move the eye examination unit 2, an instruction to start performing the examination, and the like. Details of the operation unit 60 will be described later. The control unit 50 is responsible for various controls in the ophthalmic apparatus 1 (e.g., drive control of the drive unit 4, etc.). The display unit 8 displays various images (e.g., a captured image of the subject's eye E, measurement results, etc.). In this embodiment, a touch panel is provided on the surface of the display unit 8. The touch panel is used as one of the operation units operated by the examiner to input various instructions. The display unit 8 may be provided independently of the housing 3.

[0033] (Ophthalmology unit / control unit) The eye examination unit 2 and the control unit 50 will be described with reference to FIG. 2. As described above, in this embodiment, the ophthalmic apparatus 1 is an eye refractive power measurement device. Therefore, the eye examination unit 2 of this embodiment includes an optical system for measuring the eye refractive power of the subject's eye. In detail, the eye examination unit 2 of this embodiment includes a measurement optical system 10, a fixation target presenting optical system 30, an index projection optical system 40, and an imaging optical system (observation optical system) 45. The imaging optical system 45 of this embodiment images the anterior segment of the subject's eye E. However, the imaging optical system may also image tissues other than the anterior segment of the subject's eye E (e.g., fundus tissues, etc.).

[0034] The measurement optical system 10 includes a projection optical system (light projection optical system) 10A and a light receiving optical system 10B. The projection optical system 10A projects a light beam onto the fundus of the subject's eye E through the pupil of the subject's eye E. The light receiving optical system 10B extracts a ring-shaped light beam reflected from the fundus through the pupil periphery and captures a ring-shaped fundus reflection image that is mainly used for measuring refractive power.

[0035] The projection optical system 10A includes a measurement light source 11, a relay lens 12, a hole mirror 13, and an objective lens 14 on an optical axis L1. The measurement light source 11 projects a spot-shaped light source image onto the fundus via optical members from the relay lens 12 to the objective lens 14 and the center of the pupil of the subject's eye E. The measurement light source 11 is moved in the direction of the optical axis L1 by a moving mechanism 15. The hole mirror 13 has an opening that passes a light beam from the measurement light source 11 via the relay lens 12. The hole mirror 13 is disposed at a position optically conjugate with the pupil of the subject's eye E.

[0036] The light-receiving optical system 10B shares the hole mirror 13 and the objective lens 14 with the projection optical system 10A. The light-receiving optical system 10B also includes a relay lens 16, a total reflection mirror 17, a light-receiving aperture 18, a collimator lens 19, a ring lens 20, and an image sensor 22, which are arranged on an optical axis L2 in the reflection direction of the hole mirror 13. The light-receiving aperture 18, the collimator lens 19, the ring lens 20, and the image sensor 22 are moved in the direction of the optical axis L2 together with the measurement light source 11 of the projection optical system 10A by a moving mechanism 15. When the measurement light source 11 is positioned at a position conjugate with the fundus by the moving mechanism 15, the light-receiving aperture 18 and the image sensor 22 are also positioned at positions optically conjugate with the fundus.

[0037] The ring lens 20 is an optical element for shaping the fundus reflected light guided from the objective lens 14 via the collimator lens 19 into a ring shape. The ring lens 20 has a ring-shaped lens portion and a light blocking portion. When the light receiving diaphragm 18 and the imaging element 22 are arranged at a position optically conjugate with the fundus, the ring lens 20 is arranged at a position optically conjugate with the pupil of the subject's eye E. The imaging element 22 receives the ring-shaped fundus reflected light (hereinafter referred to as a "ring image") through the ring lens 20. The imaging element 22 outputs image information of the received ring image to the control unit 50. As a result, the control unit 50 displays the ring image on the display unit 8 and calculates the refractive power based on the ring image.

[0038] In this embodiment, a dichroic mirror 29 is disposed between the objective lens 14 and the subject's eye E. The dichroic mirror 29 transmits light emitted from the light source 11 and fundus reflected light corresponding to the light from the light source 11, while guiding a light beam from a fixation target presenting optical system 30 (details of which will be described later) to the subject's eye. In addition, the dichroic mirror 29 reflects anterior eye reflected light of light from a target projection optical system 40 (details of which will be described later) and guides it to the photographing optical system 45.

[0039] The index projection optical system 40 is disposed in front of the subject's eye E. The index projection optical system 40 mainly projects an index used for aligning the optical system with respect to the subject's eye E onto the anterior segment of the subject's eye E. In this embodiment, the index projection optical system 40 projects an index used for aligning the optical system with respect to the subject's eye E in at least one of the XY direction and the Z direction onto the anterior segment. Note that the ophthalmic apparatus 1 can also perform alignment by detecting a feature in an anterior segment image without using the index projection optical system 40.

[0040] The index projection optical system 40 of this embodiment includes a ring index projection unit 41 and an index projection unit 42. The ring index projection unit 41 projects a ring index (so-called Mayer ring) onto the cornea of ​​the subject's eye E by projecting diffuse light onto the cornea. In this embodiment, the ring index projection unit 41 is also used as an anterior segment illumination unit that illuminates the anterior segment of the subject's eye E. The index projection unit 42 projects a parallel light onto the cornea of ​​the subject's eye E to project an infinite index onto the cornea.

[0041] The fixation target presenting optical system 30 includes a light source 31, a fixation target 32, a relay lens 33, a reflecting mirror 36, and a lens 39 on an optical axis L4. The fixation target 32 ​​is used to fixate the subject's eye E during objective refractive power measurement. For example, the fixation target 32 ​​is illuminated by the light source 31, and light for fixing the subject's eye E is projected onto the subject's eye E. The light source 31 and the fixation target 32 ​​are moved together in the direction of the optical axis L4 by a drive mechanism 38. The movement of the light source 31 and the fixation target 32 ​​changes the presentation position (presentation distance) of the fixation target. As a result, the subject's eye E is fogged and the refractive power is measured.

[0042] The photographing optical system 45 includes a photographing lens 46 and a photographing element 47 on an optical axis L3 in the reflection direction of the half mirror 48. The photographing element 47 is disposed at a position optically conjugate with the anterior segment of the subject's eye E. The photographing element 47 photographs the anterior segment illuminated by the ring index projection unit 41. The output from the photographing element 47 is input to the control unit 50. As a result, a photographed image (anterior segment image) of the anterior segment of the subject's eye E photographed by the photographing element 47 is displayed on the display unit 8 (see FIG. 2). The photographing element 47 also photographs an alignment index image (in this embodiment, a ring index RI and an infinity index II, see FIG. 7) formed on the cornea of ​​the subject's eye E by the index projection optical system 40. As a result, the control unit 50 can detect the alignment index image based on the photographing result of the photographing element 47. The control unit 50 can determine whether the alignment state is appropriate or not based on the position where the alignment index image is detected.

[0043] The control unit 50 controls various aspects of the ophthalmic apparatus 1 (for example, driving control of the driving unit 4, etc.). The control unit 50 includes a CPU 51, a ROM 52, and a RAM 53. The CPU 51 is a controller that controls the control. The ROM 52 stores an ophthalmic apparatus control program for controlling the ophthalmic apparatus 1, initial values, etc. The RAM 53 temporarily stores various information. The control unit 50 is connected to the optometry unit 2, the driving unit 4, the display unit 8, the operation unit 60, and a storage unit (for example, a non-volatile memory, etc.) 54. The storage unit 54 is a non-transient storage medium that can retain the stored contents even if the power supply is cut off. For example, a hard disk drive, a removable USB memory, etc. can be used as the storage unit 54.

[0044] (Operation unit) The operation unit 60 of this embodiment will be described with reference to Fig. 3 to Fig. 5. The operation unit 60 is operated by the examiner to input an instruction to move the optometric unit 2 of the ophthalmic apparatus 1 (an instruction to finely move the optometric unit 2 and an instruction to coarsely move the optometric unit 2 in this embodiment) to the ophthalmic apparatus 1. When the operation unit 60 is operated, the control unit 50 outputs a signal according to the operation content to the drive unit 4, thereby moving the relative position of the optometric unit 2 with respect to the subject's eye E.

[0045] The operation unit 60 is provided in the housing 3 of the ophthalmic device 1 (for details, see the base 5 of the housing 3, FIG. 1). However, in order to facilitate understanding of the configuration, FIGS. 3 to 5 show the operation unit 60 in a state removed from the housing 3. The operation unit 60 may be provided independently of the housing 3 of the ophthalmic device 1. In this case, the operation unit 60 may be connected to the ophthalmic device 1 by wired communication or wireless communication. FIG. 3 is a perspective view of the operation unit 60 seen from the right rear diagonally. FIG. 4 is a cross-sectional view of the operation unit 60 seen from the direction of the arrow AA in FIG. 3. FIG. 5 is a diagram showing a state in which the operation stick 61 is tilted beyond a predetermined range in the +X direction from the state shown in FIG. 3. In FIG. 3, the left front side of the paper is the +X direction, the right rear side of the paper is the -X direction, the upper side of the paper is the +Y direction, the lower side of the paper is the -Y direction, the right front side of the paper is the +Z direction, and the left rear side of the paper is the -Z direction. 4 and 5, the right side is the +X direction, the left side is the -X direction, the top is the +Y direction, the bottom is the -Y direction, the back side of the paper is the +Z direction, and the front side of the paper is the -Z direction.

[0046] (Outline of the operation unit) As shown in Figs. 3 to 5, the operation unit 60 of this embodiment includes an operation stick (sometimes called a joystick) 61 and a coarse movement operation section 70. The operation stick 61 of this embodiment extends outward (upward in this embodiment) from the housing 3 (specifically, the base 5 of the housing 3, see Fig. 1). The operation stick 61 is supported so as to be tiltable in any direction. The coarse movement operation section 70 is operated by the examiner to coarsely move the optometry unit 2. The operation unit 60 also includes an operation detection unit (a tilt detection section and a coarse movement operation detection section, described later) that detects the operation of the operation stick 61 and the coarse movement operation section 70.

[0047] In this embodiment, when a tilt operation of the operating stick 61 within a predetermined range is detected, the position of the eye examination unit 2 is finely moved according to the detected tilt operation (for example, according to the tilt direction and tilt amount (movement amount of the tilt position) of the operating stick 61). When a tilt operation of the operating stick 61 beyond the predetermined range is detected, the position of the eye examination unit 2 is coarsely moved according to the detected tilt operation (according to the tilt direction of the operating stick 61). Furthermore, when an operation of the coarse movement operation unit 70 is detected, the position of the eye examination unit 2 is coarsely moved according to the detected operation (according to the operation direction of the coarse movement operation unit 70). In other words, in the ophthalmic apparatus 1 of this embodiment, the examiner can input an instruction to coarsely move the eye examination unit 2 regardless of whether the examiner tilts the operating stick 61 beyond the predetermined range or operates the coarse movement operation unit 70.

[0048] (operation stick) As shown in FIGS. 3 to 5, the operation stick 61 is a substantially rod-shaped member that is held by the examiner. The operation stick 61 of this embodiment extends upward from the housing 3. The operation stick 61 of this embodiment is tilted in any direction within a predetermined tilt range. When the tilt angle of the operation stick 61 reaches the limit of the tilt range, the operation stick 61 cannot be tilted any further. The predetermined range in which the eye examination unit 2 is finely moved is located on the central side of the tilt range of the operation stick 61. Of the tilt range, the outside of the predetermined range in which the eye examination unit 2 is finely moved is an area for inputting a coarse movement command. The examiner can input an operation command for finely moving the eye examination unit 2 in the XZ direction in a direction corresponding to the tilt direction of the operation stick 61 by performing an operation (fine movement operation) of tilting the operation stick 61 within the predetermined range in a direction in which the eye examination unit 2 is desired to be moved. In addition, the examiner can input an operation instruction to coarsely move the eye examination unit 2 in a direction corresponding to the tilt direction of the operating stick 61 among the XZ directions by performing an operation (coarse movement operation) to tilt the operating stick 61 beyond a specified range in the direction in which the examiner wants to move the eye examination unit 2.

[0049] The operation rod 61 includes a gripping portion 62, a rotary dial 63, a measurement button 64, a ball portion 65 (see FIG. 4 and FIG. 5), and an action portion 66 (see FIG. 4 and FIG. 5). The gripping portion 62 is gripped by the examiner. The rotary dial 63 is operated by the examiner to input an instruction to move the optometry unit 2 in the up-down direction (Y direction) to the ophthalmic apparatus 1. The rotary dial 63 in this embodiment is provided in the circumferential direction on the side surface of the gripping portion 62 of the operation rod 61. The rotation of the rotary dial 63 is detected by a rotation detection portion (e.g., an encoder, etc.). For example, when the rotary dial 63 is rotated clockwise, an operation signal for moving the optometry unit 2 in the up-down direction (+Y direction) is output, and when the rotary dial 63 is rotated counterclockwise, an operation signal for moving the optometry unit 2 in the down-down direction (-Y direction) is output. The measurement button 64 is operated by the examiner to input an instruction to start an examination of the subject's eye E by the optometry unit 2.

[0050] As shown in Figs. 4 and 5, the ball portion 65 is located on the base end side (lower in this embodiment) of the generally rod-shaped operating stick 61 than the grip portion 62. The ball portion 65 is rotatably held by a bearing portion 69. As a result, the operating stick 61 can be tilted in any direction around the ball portion 65. The action portion 66 is located on the base end side of the generally rod-shaped operating stick 61 than the ball portion 65 (i.e., on the opposite side of the grip portion 62 across the ball portion 65). Therefore, when the operating stick 61 is tilted, the action portion 66 moves in the direction opposite to the tilt direction of the grip portion 62 of the operating stick 61.

[0051] A tilt detection unit 68 is provided on a part of the operating stick 61 or on a member that moves in conjunction with the tilt operation of the operating stick 61. The tilt detection unit 68 in this embodiment is connected to the action unit 66 of the operating stick 61. The tilt detection unit 68 detects the operation direction and operation amount (movement amount of the tilt position) of the tilt operation of the operating stick 61. In this embodiment, the detection result of the tilt operation of the operating stick 61 by the tilt detection unit 68 is used when slightly moving the eye examination unit 2.

[0052] (Coarse operation section) 3 to 5, the coarse movement operation unit 70 of this embodiment is an annular (approximately circular in this embodiment) member disposed around the outer periphery of the approximately rod-shaped operation stick 61. The coarse movement operation unit 70 is supported so as to be slidable in two-dimensional directions on the XZ plane. Therefore, the examiner can input a command for coarse movement of the optometry unit 2 in an appropriate direction by performing an operation (coarse movement operation) of sliding the coarse movement operation unit 70 around the operation stick 61 in the same direction as the tilt direction of the operation stick 61 when moving the optometry unit 2, without performing a tilt operation of the operation stick 61 beyond a predetermined range.

[0053] A coarse motion operation interlocking unit 71 is connected to the coarse motion operation unit 70. The coarse motion operation interlocking unit 71 moves in conjunction with the operation of the coarse motion operation unit 70 (in this embodiment, a slide operation on the XZ plane). As shown in FIG. 3, the coarse motion operation interlocking unit 71 is provided with an X detected portion 72X and a Z detected portion 72Z. In the main body of the operation unit 60, a +X coarse motion operation detection unit 77XP is provided on the +X side of the X detected portion 72X, and a -X coarse motion operation detection unit 77XM is provided on the -X side. When the coarse motion operation unit 70 is operated in the +X direction, the +X coarse motion operation detection unit 77XP detects that the X detected portion 72X of the coarse motion operation interlocking unit 71 has moved in the +X direction, thereby detecting that the coarse motion operation unit 70 has been operated in the +X direction. Furthermore, when the coarse motion operation unit 70 is operated in the -X direction, the -X coarse motion operation detection unit 77XM detects that the X detected portion 72X of the coarse motion operation interlocking unit 71 has moved in the -X direction, thereby detecting that the coarse motion operation unit 70 has been operated in the -X direction.

[0054] In the main body of the operation unit 60, a +Z coarse movement operation detector 77ZP is provided on the +Z side of the Z detected part 72Z, and a -Z coarse movement operation detector 77ZM is provided on the -Z side. When the coarse movement operation part 70 is operated in the +Z direction, the +Z coarse movement operation detector 77ZP detects that the Z detected part 72Z of the coarse movement operation interlocking part 71 has moved in the +Z direction, thereby detecting that the coarse movement operation part 70 has been operated in the +Z direction. When the coarse movement operation part 70 is operated in the -Z direction, the -Z coarse movement operation detector 77ZM detects that the Z detected part 72Z of the coarse movement operation interlocking part 71 has moved in the -Z direction, thereby detecting that the coarse movement operation part 70 has been operated in the -Z direction. As shown in Figs. 3 to 5, a biasing part 79 is provided on a part of the coarse movement operation interlocking part 71. The biasing part 79 biases the position of the coarse movement operation part 70 connected to the coarse movement operation interlocking part 71 toward the initial position.

[0055] (Relative position adjustment process) A relative position adjustment process executed by the ophthalmic apparatus 1 of the present embodiment will be described with reference to Fig. 6 and Fig. 7. In the relative position adjustment process, the ophthalmic apparatus 1 controls the driving of the driving unit 4 in response to an operation instruction input by the examiner, and adjusts the relative position between the subject's eye E and the ophthalmic examination unit 2 by moving the position of the ophthalmic examination unit 2. Furthermore, the ophthalmic apparatus 1 displays a relative fine movement range 100 of the ophthalmic examination unit 2 relative to the subject's eye E, which can be finely moved by fine movement operation of the operation unit 60, on a captured image captured by the imaging optical system 45 and displayed on the display unit 8 (on a captured image of the anterior part of the subject's eye E in this embodiment). When the power is turned on, the control unit 50 (CPU 51) of the ophthalmic apparatus 1 executes the relative position adjustment process illustrated in Fig. 6 according to an ophthalmic apparatus control program stored in a storage device (e.g., ROM 52, etc.).

[0056] First, the control unit 50 executes a process for displaying a fine movement range 100 that can be finely moved by a fine movement operation of the operation unit 60 on a captured image displayed on the display unit 8 (S1, S2). In this embodiment, the control unit 50 acquires the size of the fine movement range set at that time (current time) and the current position that is the position of the optometry unit 2 at that time (S1). Although details will be described later in S4 to S6, in this embodiment, the control unit 50 can change the size of the fine movement range that can be finely moved by a fine movement operation of the operation unit 60 according to an instruction input by the examiner. In S1, the size of the fine movement range set at that time is acquired. Also, in this embodiment, the optometry unit 2 is finely moved in the XZ directions by performing a fine movement operation on the operation unit 60. In S1, the position of the optometry unit 2 in the X direction within the fine movement range at that time is acquired. Furthermore, in S1, the position of the optometry unit 2 at that time in the Z direction (i.e., the direction along the examination axis), which can be moved by both fine movement and coarse movement, is acquired.

[0057] The control unit 50 displays a relative fine-movement range 100 of the eye examination unit 2 with respect to the subject's eye E, which can be finely moved by fine movement operation of the operation unit 60, on a captured image captured by the imaging optical system 45 and displayed on the display unit 8 according to the fine-movement range and the current position acquired in S1 (S2). Therefore, the examiner can appropriately determine whether or not alignment can be completed within the fine-movement range by checking the fine-movement range 100 displayed on the captured image.

[0058] With reference to FIG. 7, an example of the transition of the captured image and the display of the fine movement range 100 displayed on the captured image will be described. In this embodiment, the center of the captured image is the intersection of the cross indicated by the dashed line in FIGS. 7(A) to (C). The examination axis passes through the center of the captured image. Therefore, when the center of the captured image and the pupil P of the subject's eye E coincide (that is, when alignment is completed), the ophthalmic apparatus 1 is ready to perform examination. For example, in the example shown in FIG. 7(A), the pupil P of the subject's eye E shown in the captured image does not fall within the fine movement range 100. In this state, it is impossible to align the pupil P with the center of the captured image by fine movement alone. If the examiner determines that the alignment cannot be completed by fine movement alone based on the positional relationship between the pupil P and the fine movement range 100 in FIG. 7(A), the examiner performs a coarse movement operation for coarsely moving the optometry unit 2 in the X direction and an operation for moving the optometry unit 2 in the Y direction (up and down direction) on the operation unit 60, thereby moving the optometry unit 2 until the pupil P fits within the fine movement range 100. As shown in FIG. 7(B), when the pupil P fits within the fine movement range 100, it is possible to complete the alignment by fine movement alone. Therefore, the examiner performs a fine movement operation for finely moving the optometry unit 2 in the X direction to make the pupil P coincide with the center of the photographing range (see FIG. 7(C)). As described above, the examiner can perform position adjustment by coarse movement until the alignment can be completed within the fine movement range 100 while checking the fine movement range 100 displayed on the photographed image, and then perform position adjustment by fine movement. As a result, the frequency of performing position adjustment by fine movement again after interrupting fine movement and redoing position adjustment by coarse movement is reduced. Therefore, the relative position between the subject's eye E and the eye examination unit 2 can be adjusted more efficiently.

[0059] The display process of the fine movement range 100 executed in S2 of this embodiment will be described in more detail. In this embodiment, the operation stick 61 supported so as to be tiltable in any direction is used as a fine movement operation section operated to finely move the optometry unit 2. The operation stick 61 is tilted within a predetermined tilt range. In this embodiment, the fine movement range of the optometry unit 2 that can be finely moved by a fine movement operation (i.e., tilt operation of the operation stick 61) corresponds to the tilt angle (tilt range) of the operation stick 61 that can be tilted within the tilt range. Therefore, the fine movement range 100 displayed on the captured image also corresponds to the tilt range of the operation stick 61. In detail, in this embodiment, the fine movement range of the optometry unit 2 is determined according to the tilt range of the operation stick 61 and the fine movement amount (i.e., the fine movement speed) of the optometry unit 2 relative to the unit amount of the tilt operation executed. The control unit 50 sets the size of the fine movement range 100 to be displayed on the captured image according to the tilt range of the operation stick 61 and the fine movement speed of the eye examination unit 2.

[0060] As described above, in this embodiment, the control unit 50 can change the size of the fine movement range that can be finely moved by the fine movement operation of the operation unit 60 in response to an instruction input by the examiner. In S1, the size of the fine movement range set at that time is acquired. In S2, the control unit 50 sets the size of the fine movement range 100 to be displayed on the captured image in accordance with the size of the fine movement range set at that time. In other words, the larger the size of the fine movement range that is set, the larger the fine movement range 100 to be displayed on the captured image is made by the control unit 50.

[0061] In this embodiment, the optometry unit 2 is provided with an imaging optical system 45 whose imaging magnification changes according to the distance between the optometry unit 2 and the subject's eye E. When the optometry unit 2 moves in the Z direction (i.e., in the direction along the examination axis), the distance between the optometry unit 2 and the subject's eye E changes, so that the imaging magnification of the imaging optical system 45 changes. If the size of the fine movement range 100 displayed on the captured image is set according to the imaging magnification of the imaging optical system 45, it is possible for the examiner to determine whether or not the alignment can be completed within the fine movement range 100 regardless of the imaging magnification. Therefore, in S1, the position of the optometry unit 2 at that time in the Z direction (i.e., in the direction along the examination axis), which can be moved by both fine movement and coarse movement, is acquired. In S2, the control unit 50 sets the size of the fine movement range 100 displayed on the captured image according to the position of the optometry unit 2 in the Z direction at that time. That is, the closer the position of the eye examination unit 2 in the Z direction is to the position of the subject's eye E (that is, the higher the imaging magnification), the larger the fine movement range 100 displayed on the captured image is set by the control unit 50.

[0062] In this embodiment, the optometry unit 2 is finely moved in the XZ direction by the fine movement operation of the operation unit 60 within the fine movement range set at that time. In S1, the current position of the optometry unit 2 in the X direction within the fine movement range at that time is acquired. In S2, the control unit 50 sets the position of the fine movement range 100 to be displayed on the captured image based on the current position of the optometry unit 2 in the fine movement range acquired in S1. For example, if the current position of the optometry unit 2 in the X direction within the fine movement range coincides with the center within the fine movement range, the control unit 50 causes the center of the fine movement range 100 to be displayed to coincide with the center position on the captured image. In addition, if the current position of the optometry unit 2 in the X direction within the fine movement range is the rightmost limit position within the fine movement range, the ophthalmologic apparatus 1 cannot finely move the optometry unit 2 any further to the right in the X direction, but can finely move it significantly to the left. In this case, the control unit 50 sets the position of the fine-motion range 100 so that the right end of the fine-motion range 100 to be displayed is located near the center position on the captured image. As a result, the examiner can understand that it is not possible to finely move the eye examination unit 2 further to the right.

[0063] In addition, in S1 of this embodiment, the display magnification of the captured image captured by the imaging optical system 45 and displayed on the display unit 8 is also acquired. In S2, the control unit 50 sets the size of the fine movement range 100 to be displayed on the captured image according to the display magnification of the captured image acquired in S1. Therefore, by checking the fine movement range 100 displayed on the captured image, the examiner can appropriately determine whether or not alignment can be completed within the fine movement range, regardless of the display magnification of the captured image.

[0064] In this embodiment, as shown in FIG. 7, the fine movement range 100 displayed on the captured image is shown as a circle (more specifically, an annular shape). However, it is also possible to change the display manner of the fine movement range 100 on the captured image. For example, in this embodiment, the eye examination unit 2 moves in the XZ directions by fine movement operation. Therefore, it is important for the examiner to check the positional relationship between the subject's eye shown in the captured image and the fine movement range 100 to determine whether alignment can be completed by fine movement in the X direction alone. Therefore, the fine movement range 100 displayed on the captured image may be displayed in a manner indicating the range in which fine movement is possible in the X direction (for example, a line indicating the fine movement range in the X direction, a rectangular area, etc.).

[0065] Returning to the description of Fig. 6, the control unit 50 repeats the processes of S4 to S22 to perform adjustment processing of the relative position between the subject's eye E and the eye examination unit 2, and display adjustment processing of the fine movement range 100 on the captured image. First, the control unit 50 judges whether or not an instruction to change the size of the fine movement range by fine movement operation of the operation unit 60 has been input by the examiner (S4). If no instruction has been input (S4: NO), the process proceeds directly to the judgment of S8.

[0066] When the examiner operates the operation unit (for example, a touch panel provided on the display unit 8) to input an instruction to change the size of the fine movement range (S4: YES), the control unit 50 changes the size of the fine movement range in accordance with the input instruction (S5). In this embodiment, the control unit 50 changes the fine movement amount of the optometry unit 2 relative to the unit amount of the executed fine movement operation in accordance with the instruction input by the examiner, thereby changing the size of the fine movement range. In this case, the fine movement speed of the optometry unit 2 changes, thereby changing the size of the fine movement range. Therefore, even if the operation amount of the fine movement operation is limited (for example, if the tilt angle of the operation stick 61 is limited to a certain angle range), the size of the fine movement range changes appropriately. Next, the control unit 50 changes the size of the fine movement range 100 on the captured image on the display unit 8 in accordance with the size of the fine movement range changed in S5 (S6). For example, the control unit 50 increases the fine movement range 100 displayed on the captured image as the fine movement range increases. Therefore, even if the examiner changes the fine movement range, the examiner can appropriately determine whether or not it is possible to complete the alignment within the changed fine movement range. After that, the process proceeds to S8.

[0067] Next, the control unit 50 judges whether or not an operation of the rotary dial 63 for moving the optometry unit 2 in the Y direction (vertical direction) is detected (S8). If an operation of the rotary dial 63 is not detected (S8: NO), the process proceeds directly to the judgment of S11. If an operation of the rotary dial 63 is detected (S8: YES), the control unit 50 controls the driving of the drive unit 4 according to the detected operation direction (rotation direction) and operation amount (rotation amount) of the rotary dial 63, thereby moving the position of the optometry unit 2 in the vertical direction (Y direction) in the direction corresponding to the operation direction by a distance corresponding to the operation amount (S9). After that, the process proceeds to S11. Note that the ophthalmic apparatus 1 may adjust the relative position between the subject's eye E and the optometry unit 2 by moving the face support unit 9 in the vertical direction together with the optometry unit 2 or separately from the optometry unit 2.

[0068] Next, the control unit 50 judges whether or not a fine movement operation (a tilt operation within a predetermined range of the operating stick 61 in this embodiment) for finely moving the eye examination unit 2 has been detected by the operation detection unit (the tilt detection unit 68 in this embodiment) (S11). If a fine movement operation has not been detected (S11: NO), the process proceeds directly to S20. If a fine movement operation is detected (S11: YES), the control unit 50 controls the driving of the drive unit 4 according to the detected tilt direction and tilt amount of the operating stick 61, thereby finely moving the position of the eye examination unit 2 in the front-rear and left-right directions (XZ directions) in the direction corresponding to the tilt direction by a distance corresponding to the tilt amount (S12).

[0069] Next, the control unit 50 judges whether or not the direction of the slight movement of the optometry unit 2 executed in S12 includes a component in a direction intersecting the examination axis (X direction in this embodiment) (S14). If the component in the X direction is not included (S14: NO), the process proceeds directly to S17. If the direction of the slight movement of the optometry unit 2 executed in S12 includes a component in the X direction (S14: YES), the control unit 50 moves the position of the slight movement range 100 displayed on the captured image according to the position of the optometry unit 2 slightly moved in the X direction (S15). Therefore, by checking the slight movement range 100 displayed on the captured image, the examiner can appropriately grasp in which direction (+X direction and -X direction) and by how far the optometry unit 2 can be slightly moved in the X direction intersecting the examination axis.

[0070] In detail, the control unit 50 of this embodiment moves the position of the fine movement range 100 displayed on the captured image in the direction opposite to the movement direction of the eye examination unit 2 finely moved within the fine movement range in the X direction by a distance corresponding to the fine movement distance. For example, in Fig. 7(B) to Fig. 7(C), the eye examination unit is finely moved in the +X direction (rightward). Therefore, the control unit 50 moves the position of the fine movement range 100 displayed on the captured image in the -X direction (leftward) opposite to the movement direction of the eye examination unit 2 finely moved in the +X direction (rightward). As a result, the direction in the X direction and the distance by which the eye examination unit 2 can be finely moved can be appropriately grasped from the position of the fine movement range 100 displayed on the captured image.

[0071] In other words, the control unit 50 of this embodiment moves the position of the fine movement range 100 displayed on the captured image according to the tilt position of the operation stick 61. In detail, the control unit 50 moves the position of the fine movement range 100 displayed on the captured image by a distance corresponding to the amount of tilt in the direction opposite to the tilt direction of the operation stick 61 tilted within the tilt range. As a result, the direction and distance by which the operation stick can be tilted (i.e., the direction and distance by which the eye examination unit can be finely moved) are appropriately grasped from the position of the fine movement range 100 displayed on the captured image. Note that the tilt position of the operation stick 61 changes according to the tilt angle. Therefore, the control according to the tilt position of the operation stick 61 also includes control to finely move the eye examination unit 2 according to the tilt angle of the operation stick 61.

[0072] Next, the control unit 50 judges whether or not the direction of the slight movement of the optometry unit 2 executed in S12 includes a component in the direction along the examination axis (Z direction in this embodiment) (S17). If the Z-direction component is not included (S17: NO), the process proceeds directly to S20. If the direction of the slight movement of the optometry unit 2 executed in S12 includes a Z-direction component (S17: YES), the control unit 50 changes the size of the slight movement range 100 displayed on the captured image according to the position of the optometry unit 2 in the Z direction. That is, the closer the position of the optometry unit 2 in the Z direction is to the position of the subject's eye E (i.e., the higher the shooting magnification), the larger the slight movement range 100 displayed on the captured image becomes. As described above, in this embodiment, when the optometry unit 2 moves in the Z direction, the distance between the optometry unit 2 and the subject's eye E changes, and therefore the shooting magnification of the subject's eye E by the shooting optical system 45 changes. If the size of the fine movement range 100 displayed on the captured image is set according to the imaging magnification of the imaging optical system 45, it is possible for the examiner to determine whether or not the alignment can be completed within the fine movement range 100 regardless of the imaging magnification. Therefore, by changing the size of the fine movement range 100 displayed on the captured image according to the position of the optometry unit 2 in the Z direction, it becomes easier to adjust the relative position between the subject's eye E and the optometry unit 2 more efficiently. After that, the process proceeds to S20.

[0073] Next, the control unit 50 judges whether or not a coarse movement operation for coarsely moving the optometry unit 2 (in this embodiment, a tilting operation of the operation stick 61 beyond a predetermined range, or a sliding operation of the coarse movement operation part 70) is detected by the operation detection unit (in this embodiment, the coarse movement operation detection part) (S20). If a coarse movement operation is not detected (S20: NO), the process returns to S4. If a fine movement operation is detected (S20: YES), the control unit 50 controls the driving of the drive unit 4 according to the detected operation direction and operation amount (for example, the operation time of a switch) of the operation stick 61 or the coarse movement operation part 70, thereby coarsely moving the position of the optometry unit 2 in the front-rear and left-right directions (XZ directions) in the direction corresponding to the operation direction (S21). Furthermore, if the direction of the coarse movement of the optometry unit 2 executed in S20 includes a component in the direction along the examination axis (Z direction in this embodiment), the control unit 50 changes the size of the fine movement range 100 displayed on the captured image according to the position of the optometry unit 2 in the Z direction (S22). As a result, the examiner can properly grasp whether or not alignment can be completed within the fine movement range 100, regardless of the position of the eye examination unit 2 in the Z direction. Note that the movement process of the eye examination unit 2 in S21 is a coarse movement process, not a fine movement process. Therefore, even if the processes of S21 to S22 are performed, the center position of the fine movement range 100 displayed on the captured image does not change.

[0074] The control unit 50 can also change the display magnification of the captured image captured by the imaging optical system 45 and displayed on the display unit 8. For example, the examiner can input an instruction to change the display magnification of the captured image by operating an operation unit (for example, a touch panel provided on the display unit 8). The control unit 50 changes the display magnification of the captured image in response to the instruction to change the display magnification input by the examiner. Here, when changing the display magnification of the captured image, the control unit 50 changes the size of the fine movement range 100 displayed on the captured image in response to the display magnification of the captured image. Therefore, by checking the fine movement range 100 displayed on the captured image, the examiner can appropriately determine whether or not alignment can be completed within the fine movement range regardless of the display magnification of the captured image.

[0075] The technology disclosed in the above embodiment is merely an example. Therefore, the technology exemplified in the above embodiment can be changed. For example, in the above embodiment, the optometry unit 2 is finely moved in the XZ direction by a fine movement operation. However, it is also possible to change the direction in which the optometry unit 2 is finely moved by the fine movement operation. In this case, the display position of the fine movement range 100 on the captured image and the movement direction, etc. may be appropriately set according to the direction in which the optometry unit 2 is finely moved by the fine movement operation. For example, the ophthalmic device 1 may finely move the optometry unit 2 in the XY direction by the fine movement operation. In this case, the control unit 50 may set the position in the XY direction of the fine movement range 100 to be displayed on the captured image based on the current position in the XY direction within the fine movement range of the optometry unit 2 acquired in S1 in S2. The control unit 50 may move the position in the XY direction of the fine movement range 100 to be displayed on the captured image according to the position of the optometry unit 2 finely moved in the XY direction in S15. [Explanation of symbols]

[0076] 1 Ophthalmology equipment 2 Optometry Unit 4 Drive unit 8 Display 45 Photographing Optical System 50 Control section 51 CPU 52 ROM 60 Operation Unit 68 Tilt detection unit 77XP +X coarse motion detection unit 77XM-X coarse motion detection unit 77ZP +Z coarse motion detection unit 77ZM-Z coarse motion detection unit 100 micromotion range

Claims

1. an optometry unit for examining the subject's eye with an examination axis aligned with the subject's eye; a drive unit that moves a relative position of the eye examination unit with respect to the subject's eye; an operation unit operated by an examiner to drive the drive unit; an operation detection unit that detects an operation of the operation unit; an imaging optical system for imaging the subject's eye; A control unit; Equipped with The control unit is a fine movement step of finely moving a position of the optometry unit within a fine movement range by controlling the drive unit in response to the fine movement operation detected by the operation detection unit when the fine movement operation for finely moving the optometry unit is detected by the operation detection unit; a coarse movement step of coarsely moving a position of the optometry unit by controlling the drive unit in response to the detected coarse movement operation when the operation detection unit detects that a coarse movement operation for coarsely moving the optometry unit has been performed on the operation unit; a fine movement range display step of displaying the fine movement range of the eye examination unit with respect to the subject's eye, which is finely moved by the fine movement operation, on a captured image captured by the imaging optical system and displayed on a display unit; An ophthalmic apparatus comprising:

2. 2. An ophthalmic apparatus according to claim 1, The control unit is a fine movement range changing step of changing a size of the fine movement range that can be finely moved by the fine movement operation in response to an instruction input by an examiner; In the fine movement range display step, a size of the fine movement range displayed on the captured image is changed according to the fine movement range changed in the fine movement range changing step.

3. 3. An ophthalmic apparatus according to claim 1, The control unit is an ophthalmologic apparatus characterized in that, in the fine movement range display step, the position of the fine movement range to be displayed on the captured image is moved according to the position of the eye examination unit that has been finely moved within the fine movement range in a direction intersecting the examination axis.

4. 4. An ophthalmic apparatus according to claim 1, the operation unit includes an operation rod supported so as to be tiltable in any direction as a fine movement operation part for finely moving the optometry unit, The control unit is an ophthalmologic apparatus including: moving a position of the fine movement range displayed on the captured image in accordance with a tilt position within the tilt range of the operation stick in the fine movement range display step;

5. 5. An ophthalmic apparatus according to claim 1, The control unit is An ophthalmologic apparatus characterized in that, in the fine movement range display step, the size of the fine movement range displayed on the captured image is changed depending on the display magnification of the captured image captured by the photographing optical system and displayed on the display unit.

6. 6. An ophthalmic apparatus according to claim 1, the photographing optical system, the magnification of which changes depending on the distance between the photographing optical system and the subject's eye, is provided in the eye examination unit, The control unit is an ophthalmologic apparatus comprising: an ophthalmologic apparatus, in which, in the fine movement range display step, a size of the fine movement range displayed on the captured image is changed depending on a position of the optometry unit in a direction along the examination axis.

7. An ophthalmic device control program for controlling an ophthalmic device, The ophthalmic device includes: an optometry unit for examining the subject's eye with an examination axis aligned with the subject's eye; a drive unit that moves a relative position of the eye examination unit with respect to the subject's eye; an operation unit operated by an examiner to drive the drive unit; an operation detection unit that detects an operation of the operation unit; an imaging optical system for imaging the subject's eye; A control unit; Equipped with The ophthalmologic apparatus control program is executed by the control unit, a fine movement step of finely moving a position of the optometry unit within a fine movement range by controlling the drive unit in response to the fine movement operation detected by the operation detection unit when the fine movement operation for finely moving the optometry unit is detected by the operation detection unit; a coarse movement step of coarsely moving a position of the optometry unit by controlling the drive unit in response to the detected coarse movement operation when the operation detection unit detects that a coarse movement operation for coarsely moving the optometry unit has been performed on the operation unit; a fine movement range display step of displaying the fine movement range of the eye examination unit with respect to the subject's eye, which is finely moved by the fine movement operation, on a captured image captured by the imaging optical system and displayed on a display unit; An ophthalmic apparatus control program, comprising: a control program for controlling an ophthalmic apparatus;

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