Ophthalmologic apparatus, control method of ophthalmologic apparatus, and program

Abstract

To reduce glare at the time of observation, and to acquire brightness suitable for observation.SOLUTION: An ophthalmologic apparatus for imaging an eye to be examined by illuminating the eye to be examined with illumination light includes illumination means for illuminating a first region of the eye to be examined with the illumination light when taking a first image of the eye to be examined, and illuminating a second region whose shape is different from that of the first region with illumination light whose shape is different from the shape of a light beam of the illumination light with which the first region is illuminated when taking a second image of the eye to be examined.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to an ophthalmic apparatus, a control method for an ophthalmic apparatus, and a program. [Background technology]

[0002] Currently, in the field of ophthalmology, fundus cameras are in practical use as devices for photographing the fundus of a subject's eye as a two-dimensional image.

[0003] When observing the fundus with a fundus camera, a light source such as a xenon lamp or an LED that outputs near-infrared or infrared light is used. In this case, the observed image is monochrome. When photographing the fundus, a light source such as an arc lamp or an LED that outputs visible light is used. In this case, the photographed image is color. Generally, visible light is more dazzling than infrared light, so if the subject's eye is illuminated with a visible light source, there is a high possibility that the subject's eye will constrict. For this reason, fundus cameras that use infrared light for observation and visible light for photography are becoming more common. However, there is also a need to obtain color images rather than monochrome images for observation.

[0004] Here, Patent Document 1 discloses an ophthalmic device that uses a visible light source both during observation and during photography in order to obtain a color image during observation. Patent Document 1 also discloses a method for reducing glare during observation by reducing the amount of light during observation compared to the amount of light during photography. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-17682 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, with a method of reducing the amount of light during observation to be less than the amount of light during photography, it is not possible to obtain brightness suitable for observation, and the fundus may become dark.

[0007] Therefore, an object of the present disclosure is to reduce glare during observation and obtain brightness suitable for observation. [Means for solving the problem]

[0008] The ophthalmic device disclosed herein is an ophthalmic device that photographs a test eye by illuminating the test eye with illumination light, and is equipped with an illumination means that, when photographing a first image of the test eye, illuminates a first region of the test eye with the illumination light, and, when photographing a second image of the test eye, illuminates a second region having a shape different from that of the first region with illumination light having a different shape from that of the light beam of the illumination light that illuminated the first region. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to reduce glare during observation and obtain brightness suitable for observation. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing a general configuration of a fundus camera according to a first embodiment. [Figure 2] FIG. 1 is a schematic diagram showing an optical configuration according to a first embodiment. [Figure 3] 1 is a schematic diagram showing a relationship with an eye to be examined according to the first embodiment. FIG. [Figure 4] FIG. 2 is a schematic diagram illustrating an example of a control unit according to the first embodiment. [Figure 5] 3 is a schematic diagram showing an example of the relationship between illumination of an eye to be inspected and miosis according to the first embodiment. FIG. [Figure 6] FIG. 2 is a schematic diagram illustrating an example of a switchable lens baffle according to the first embodiment. [Figure 7] 4 is a flowchart showing a series of processes for visible light observation and visible light photography according to the first embodiment. [Figure 8]4 is a schematic diagram showing an example of a change in light flux when the lens baffle according to the first embodiment is switched. FIG. [Figure 9] FIG. 10 is a schematic diagram showing an optical configuration according to a second embodiment. [Figure 10] FIG. 10 is a schematic diagram showing an example of a switchable mask according to the second embodiment. [Figure 11] 10 is a flowchart showing a series of processes for visible light observation and visible light photography according to the second embodiment. [Figure 12] 10 is a schematic diagram showing an example of a change in a light-blocking area on the fundus when a mask according to the second embodiment is switched. FIG. [Figure 13] FIG. 10 is a schematic diagram showing another example of a mask according to the second embodiment. [Figure 14] FIG. 10 is a schematic diagram illustrating an example of a switchable lens baffle according to a third embodiment. [Figure 15] 10 is a flowchart showing a series of processes for visible light observation and visible light photography according to the third embodiment. [Figure 16] FIG. 10 is a schematic diagram showing an example of a change in light flux when the lens baffle according to the third embodiment is switched. DETAILED DESCRIPTION OF THE INVENTION

[0011] The embodiments of the present disclosure will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of components described in the following examples are arbitrary and can be changed depending on the configuration of the device to which the present disclosure is applied or various conditions. In addition, the same reference numerals are used in the drawings to indicate identical or functionally similar elements.

[0012] [Embodiment 1] In the first embodiment, an example of a fundus camera to which the present disclosure is applied will be described with reference to FIGS.

[0013] In this embodiment, a light beam changing means disposed at a position conjugate with the posterior surface of the crystalline lens is used to control the change of light beam depending on whether the observation is visual observation or visual photography. This reduces glare during observation and makes it possible to obtain brightness suitable for observation. This embodiment will be described in detail below.

[0014] <Outline of the device configuration> First, the general configuration of a fundus camera according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing an example of the general configuration of a fundus camera. The fundus camera is provided with an imaging unit 10, a control unit 20, and a display unit 30. The imaging unit 10 is provided with an optical head unit 100, a stage unit 110, a base unit 120 including operation units such as a joystick and a shooting button (not shown), and a face support unit 130.

[0015] The optical head unit 100 includes a measurement optical system that irradiates the subject's eye with light, detects the return light from the subject's eye, and observes and captures an anterior ocular observation image and a frontal fundus image. The stage unit 110 is an example of a moving unit that can move the optical head unit 100 in the x, y, and z directions in the figure using a driving mechanism such as a motor (not shown). The face support unit 130 is a chin rest that can fix the subject's chin and forehead, thereby promoting fixation of the subject's eye (examined eye). The face support unit 130 is also an example of a moving unit that can move the face support unit 130 in the y direction in the figure using a driving mechanism such as a motor (not shown).

[0016] The control unit 20 is connected to the photographing unit 10 and the display unit 30 and can control them. The control unit 20 can align the optical head unit 100 with the subject's eye by, for example, controlling the movement of the stage unit 110. The control unit 20 can also generate an anterior eye observation image, a frontal fundus image, and the like based on data acquired by the photographing unit 10.

[0017] The control unit 20 can be configured using a general computer including a processor and memory, but may also be configured as a computer dedicated to the fundus camera. The control unit 20 may be a separate (external) computer to which the photographing unit 10 is communicatively connected, or may be a built-in (internal) computer of the photographing unit 10. The control unit 20 may also be, for example, a personal computer, such as a desktop PC, a notebook PC, or a tablet PC (portable information terminal).

[0018] The display unit 30 is configured by any monitor. The display unit 30 displays various information such as subject information and various images under the control of the control unit 20. The display unit 30 may be a touch panel display. In this case, the display unit 30 is also used as an operation unit.

[0019] In this embodiment, the photographing unit 10, the control unit 20, and the display unit 30 are configured separately, but some or all of these may be configured as an integrated unit. Also, the control unit 20 may be connected to other devices (for example, a storage device, etc.).

[0020] <Optical configuration of the device> Next, the optical system of the fundus camera according to this embodiment will be described with reference to the schematic diagrams of FIGS. 2 and 3. The optical system is composed of an observation optical system for observing the eye to be examined, or an imaging optical system for imaging the eye to be examined. The configuration of the optical system is divided into multiple optical axes L1 to L5 on which various optical elements are arranged, and each of these will be described in turn. Note that the optical axes L1 to L3 are optical paths along which illumination light emitted from the visible light source 201 illuminates the eye to be examined. Note that the configuration relating to the optical axes L1 to L3 is an example of an illumination means. In this embodiment, the illumination light on the optical axes L1 to L3 may also be referred to as a "light beam."

[0021] A light source that emits light for observing or photographing the fundus and related components are arranged on the optical axis L1. This component is arranged along the optical path of the light emitted from the light source. A visible light source 201 for observation and photography, a condenser lens 202, and a mirror 203 are arranged on the optical axis L1. Note that a xenon lamp, a white LED, or the like may be used as the visible light source 201.

[0022] On the optical axis L2 in the reflection direction of the mirror 203, a ring slit 204 having a ring-shaped opening, a lens baffle 205, a splitter unit 206, a relay lens 207, a cornea baffle 208, and a perforated mirror 209 having a central opening are arranged in this order from the mirror 203. The ring slit 204 is arranged at a position that is approximately optically conjugate with the pupil 301 of the subject's eye E, the lens baffle 205 is arranged at a position that is approximately optically conjugate with the posterior surface 302 of the lens of the subject's eye E, and the cornea baffle 208 is arranged at a position that is approximately optically conjugate with the cornea 300 of the subject's eye E. The lens baffle 205 is an example of a light beam changing means.

[0023] An objective lens 211 is disposed on an optical axis L3 in the reflection direction of the perforated mirror 209, facing a dichroic mirror 210 and the subject's eye E. A photographing diaphragm 220 is disposed in the hole of the perforated mirror 209, and further behind it are a focus lens 212 that adjusts the focus by moving its position on the optical axis L3, a photographing lens 213, and a half mirror 214. A two-dimensional image sensor 230 that can be used for both observation in visible light and still image capture is disposed beyond the half mirror 214.

[0024] A high-sensitivity CMOS sensor may be used as the two-dimensional image sensor 230. Because the amount of light reflected from the fundus 303 of the subject's eye E is low compared to the amount of incident light, a high-sensitivity CMOS sensor capable of achieving resolution even with a low amount of received light is suitable for observation, etc. Furthermore, a single photon avalanche diode (SPAD) sensor may be used as the two-dimensional image sensor 230. A SPAD sensor is a highly sensitive sensor that uses avalanche multiplication and photon counting technology. In addition to the advantage of being able to achieve resolution even with a low amount of received light, a SPAD sensor also has the advantage of being able to eliminate read noise during digital signal conversion, allowing for the generation of clearer images from the small amount of reflected light from the fundus 303. Furthermore, because a high-sensitivity CMOS sensor or SPAD sensor can generate clearer images from a small amount of reflected light, the amount of contrast agent used during fluorescent fundus photography can be reduced. The risks of side effects from using contrast agents include nausea, drug allergies, and anaphylactic shock, which place a significant burden on the subject, so there is a great benefit in being able to reduce the amount of contrast agent used.

[0025] An internal fixation target 260 that indicates the target position of the line of sight of the subject's eye is disposed at the end of the optical axis L4, which is the reflection direction of the half mirror 214. The target position of the line of sight of the subject's eye can be changed to any position by the examiner's operation, etc.

[0026] A lens 215, a diaphragm 216, a prism 217, a lens 218, and a two-dimensional image sensor 240 sensitive to infrared light are arranged on the optical axis L5 of the dichroic mirror 210. This configuration forms an anterior-segment observation optical system for observing the anterior segment. Light incident on the prism 217 is refracted in opposite left-right directions by the upper and lower halves of the prism 217 and split. Therefore, when the distance between the subject's eye E and the optical head unit 100 is longer than the appropriate working distance, the observed image of the anterior segment is formed by the lens 215 closer to the lens 215 than the prism 217, with the upper half of the observed image shifted to the right and the lower half shifted to the left. When the distance between the subject's eye E and the optical head unit 100 is shorter than the appropriate working distance, the observed image is captured upside down. The anterior segment of the subject's eye E is illuminated by an infrared light source 250 for anterior-segment observation. The above-described anterior segment observation optical system makes it possible to detect the alignment state with the anterior segment of the subject's eye E. In this embodiment, this configuration, the stage unit 110, and the control unit 20 constitute an alignment means that controls the alignment of the photographing optical system with the subject's eye.

[0027] Next, the configuration of the focus optical system will be described.

[0028] The split unit 206 arranged on the optical axis L2 has a focus index light source, a prism, a focus index mask, an insertion / removal mechanism, and a unit movement mechanism (not shown). The focus index light source is used to project a focus index. The prism is used to split the light source and projects split focus indexes onto the pupil of the subject's eye E. The focus index mask is also used to form the outer shape of the focus index. The focus index mask is arranged in a position that is approximately optically conjugate with the fundus 303 of the subject's eye E.

[0029] The insertion / extraction mechanism has a split insertion / extraction drive motor. The split insertion / extraction drive motor inserts the split unit 206 into the optical axis L2. This allows the split index to be projected into the fundus image. The split insertion / extraction drive motor is also used when removing the split unit 206 into the optical axis L2. This prevents the focus index from being captured in the fundus image.

[0030] The unit moving mechanism has a split shift motor, which is used to shift the split unit 206 in the optical axis direction to adjust the focus of the focus index.

[0031] The splitter unit 206 and the focus lens 212 move in conjunction with each other under control of the control unit 20. The two-dimensional image sensor 230 is optically approximately conjugate with the focus index mask. Therefore, moving the splitter unit 206 in the optical axis direction moves the split index on the fundus image captured by the two-dimensional image sensor 230. At the same time, the focus lens 212 moves in conjunction with each other in the optical axis direction. The focus indexes split and projected onto the pupil of the subject's eye E are aligned in the same straight line, bringing the fundus of the subject's eye E into focus. In manual operation, the examiner operates an operation unit (not shown) while checking the focus index projected on the fundus image. The control unit 20 moves the splitter unit 206 and the focus lens 212 in conjunction with each other in accordance with the examiner's operation. In automatic operation, the control unit 20 analyzes the fundus image to detect the position of the focus index and automatically moves the splitter unit 206 and the focus lens 212 in conjunction with each other.

[0032] <Controller configuration> Next, the configuration of the control unit of the fundus camera according to this embodiment will be described with reference to the schematic diagram of Fig. 4. Fig. 4 is a block diagram showing an example of the configuration of the control unit 20. The control unit 20 includes an acquisition unit 21, an image generation unit 22, an image analysis unit 23, a drive control unit 24, and a storage unit 25.

[0033] The acquisition unit 21 can acquire various signals output from the two-dimensional image sensor 230 and the two-dimensional image sensor 240. The acquisition unit 21 can also acquire instructions from an operator via an operation unit (not shown). Furthermore, the acquisition unit 21 can acquire various information such as subject information stored in the storage unit 25, various images such as fundus images, and various images generated by the image generation unit 22.

[0034] The image generating unit 22 can generate an anterior eye observation image based on the output signal of the two-dimensional image sensor 240 acquired by the acquiring unit 21, and can generate a fundus observation image and a fundus photograph image based on the output signal of the two-dimensional image sensor 230. Note that any known method may be used to generate images for ophthalmologists, such as fundus observation images and fundus photograph images, from ophthalmologic information, such as data related to the fundus of the subject's eye E. The image generating unit 22 can also generate a fundus motion image by continuously stitching together the generated fundus observation images in a time series. Furthermore, the image generating unit 22 can also generate a fundus panoramic image by continuously stitching together the generated fundus observation images in a positional manner.

[0035] The image analysis unit 23 can calculate information about the position and shape of the subject's eye E by analyzing the images generated by the image generation unit 22. Furthermore, by continuously analyzing the images generated by the image generation unit 22, it can detect changes in the position and state of the subject's eye E.

[0036] The drive control unit 24 controls the driving of various components within the imaging unit 10. Specifically, the drive control unit 24 can control the driving of, for example, the stage unit 110, the face support unit 130, the lens baffle 205, the split unit 206, the focus lens 212, and the like.

[0037] The storage unit 25 can store various types of generated information, various images, and videos. The storage unit 25 can also store identification information of the subject, etc. Furthermore, the storage unit 25 can store programs for imaging, etc.

[0038] Each component of the control unit 20 other than the storage unit 25 may be configured by a software module executed by a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). The processor may be, for example, a GPU (Graphical Processing Unit) or an FPGA (Field-Programmable Gate Array). Each component may also be configured by a circuit that performs a specific function, such as an ASIC. The storage unit 25 may be configured by any storage medium, such as an optical disk such as a hard disk, or a memory.

[0039] <Illumination and miosis of the subject's eye> Next, the relationship between illumination of the subject's eye and miosis will be described with reference to FIG.

[0040] A corneal baffle image 300, which is an image of the corneal baffle 208, is formed near the cornea Ec in the anterior part of the subject's eye E, a ring slit image 301, which is an image of the ring slit 204, is formed near the anterior surface (pupil) of the lens E1, and a lens baffle image 302, which is an image of the lens baffle 205, is formed near the posterior surface of the lens E1. The iris Ei is also located near the entire surface of the lens E1. These corneal baffle image 300, ring slit image 301, and lens baffle image 302 prevent reflection of illumination light on the optical surfaces of the subject's eye E (the cornea Ec or lens E1), and illumination light 310, shown by the shaded area in Figure 5(a) and passing through between the corneal baffle image 300, ring slit image 301, and lens baffle image 302, illuminates the fundus 303.

[0041] In such an illumination method, if the subject feels glare, the iris Ei of the subject's eye E constricts, reducing the pupil diameter. When the pupil diameter reduces, illumination light blocking portions 311, which are the mesh portions of the illumination light 310 shown in FIG. 5(b), occur, reducing the amount of light (amount of incident light) that reaches the fundus 303. When the amount of incident light decreases, the amount of light reflected from the fundus 303 also decreases, resulting in a dark fundus image generated from the reflected light. Furthermore, the illumination unevenness caused by the illumination light blocking portions 311 results in uneven brightness in the generated fundus image.

[0042] Visible light is more likely to be perceived as dazzling than infrared light, and the subject's eye is more likely to contract, resulting in the state shown in Figure 5(b). Therefore, measures are necessary to ensure good visible light observation.

[0043] Switchable crystal baffle control Next, control of the switchable lens baffle according to this embodiment will be described with reference to FIG.

[0044] The lens baffle 205 is composed of a fixed light-shielding portion 205a having a light-shielding portion in the center, and a movable light-shielding portion 205b that can rotate in the direction of the arrow around a fulcrum 205c and covers the light-shielding portion 205a. The area of ​​the light-shielding portion can be changed by inserting or removing the movable light-shielding portion 205b into or from the optical path. When the movable light-shielding portion 205b is inserted into the optical path, the light-shielding area becomes larger, and when the movable light-shielding portion 205b is removed from the optical path, the light-shielding area becomes smaller.

[0045] <Visible light observation and visible light photography flow> Next, a flow of visible light observation and visible light photography according to this embodiment will be described with reference to Fig. 7. Fig. 7 is a flowchart showing a series of processes for visible light observation and visible light photography according to this embodiment.

[0046] First, in step S401, the examiner uses the input unit to input the subject information to the control unit 20. Here, it is assumed that the examination starts with this operation.

[0047] Next, in step S402, the image generating unit 22 generates an image for anterior eye observation. More specifically, the control unit 20 turns on the light source 250 for anterior eye observation, the acquisition unit 21 acquires a signal output from the two-dimensional image sensor 240, and the image generating unit 22 generates an image for anterior eye observation based on the acquired signal. The generated image for anterior eye observation is displayed on the display unit 30 and stored in the storage unit 25.

[0048] Next, in step S403, the examiner moves the face support unit 130 and the optical head unit 100 to predetermined positions using the input unit and the operation unit while viewing the anterior eye observation image displayed on the display unit 30. Alternatively, the drive control unit 24 may automatically move the face support unit 130 and the optical head unit 100 to predetermined positions. Furthermore, the examiner may then fine-tune the positions using the input unit and the operation unit.

[0049] Next, in step S404, the examiner determines whether to start visible light observation. The examiner checks the position of the eye to be examined from the anterior eye observation image displayed on the display unit 30, and if he determines that visible light observation is possible, he starts visible light observation using the input unit and operation unit. The control unit 20 detects that an operation to start visible light observation has been performed, and the process proceeds to step S405. If the examiner determines that further position adjustment is necessary, he does not perform an operation to start visible light observation, but performs an operation to adjust the position again. The process returns to step S402.

[0050] Next, in step S405, in order to perform visible light observation, the drive control unit 24 switches the lens baffle 205 to a lens baffle for visible light observation. The lens baffle for visible light observation is a lens baffle used to illuminate the illumination light onto a first region of the subject's eye.

[0051] The switching of the lens baffle 205 will be described with reference to the schematic diagram of Fig. 8. Fig. 8 is a schematic diagram showing an example of a change in the shape of the light beam illuminating the subject's eye when the lens baffle according to this embodiment is switched.

[0052] When the subject's eye is not miotic, the pupil is sufficiently large as shown by 500a in Fig. 8(a), and a good fundus image can be obtained by irradiating the subject's eye with a light beam 510c shown in Fig. 8(c). At this time, the movable light blocking portion 205b of the lens baffle 205 is inserted into the optical path.

[0053] However, visible light is more likely to cause glare than infrared light, leading to a higher likelihood of the subject's eye contracting. When the subject's eye contracts, the pupil becomes smaller as shown by 500b in FIG. 8(b). Even if the light beam 510c shown in FIG. 8(c) is incident on the subject's eye, the illumination light blocking portion 311 is generated, resulting in a dark fundus image. Therefore, when performing visible light observation, the drive control unit 24 switches the lens baffle 205 to change the shape of the light beam 510c to the shape of the light beam 510d shown in FIG. 8(d). Changing the shape of the light beam changes the area illuminated on the subject's eye. Changing the shape of the light beam also reduces the area of ​​the illumination light blocking portion 311, making it easier for the illumination light to reach the fundus even when the subject's eye contracts.

[0054] When the shape of light beam 510c is changed to that of light beam 510d, movable light blocking portion 205b of lens baffle 205 is removed from the optical path. Light beam 510d in FIG. 8(d) has a narrower light blocking area on the inner side of the light beam than light beam 510c, so that the light passes closer to the inside of the pupil. This allows the fundus to be brightened even when the subject's eye is miotic, thereby enabling better visible light observation. The area illuminated by light beam 510d is an example of a first area. The area illuminated by light beam 510c is an example of a second area.

[0055] In this embodiment, when performing visible light observation, the drive control unit 24 switches the lens baffle 205 so that the light beam 510d shown in FIG. 8(d) is incident on the subject's eye. However, this is not limiting. For example, the drive control unit 24 may switch to the light beam 510e shown in FIG. 8(e). Compared to the light beam 510c, the light beam 510e in FIG. 8(e) has a narrower light-blocking area on the inner side of the light beam so that the light passes closer to the pupil, and also has a wider light-blocking area on the outer side of the light beam to reduce the amount of light incident on the subject's eye. The shape of the light beam can be changed by changing the shape of the light-blocking portion of the lens baffle 205. The shape of the light beam may be, for example, the shape of the light beam 510f shown in FIG. 8(f). The light beam 510f in FIG. 8(f) has an elliptical shape compared to the light beam 510c, and the light passes closer to the pupil. The shape of the light beam can be made elliptical by changing the shape of the light blocking portion of the crystal baffle 205 or by tilting the crystal baffle 205 .

[0056] Next, in step S406, the control unit 20 turns on the visible light source 201 to perform visible light observation. At this time, the control unit 20 also reduces the light intensity of the visible light source 201 to a light intensity for visible light observation. Since visible light is more likely to cause glare than infrared light, the control unit 20 adjusts the light intensity of the visible light so as to minimize pupil constriction and so that the incident light flux switched in step S405 has a brightness that allows visible light observation of the fundus.

[0057] Next, in step S407, the image generating unit 22 generates a fundus observation image. More specifically, the acquiring unit 21 acquires a signal output from the two-dimensional image sensor 230, and the image generating unit 22 generates a fundus observation image based on the acquired signal. The fundus observation image is, for example, a moving image and is an example of a first image. The generated fundus observation image is displayed on the display unit 30 and stored in the storage unit 25. The image generating unit 22 also generates a fundus moving image based on the continuously generated fundus observation images. The generated fundus moving image is stored in the storage unit 25. The fundus moving image may be generated using all the generated fundus observation images, or may be generated by selecting (thinning out) some of the generated fundus observation images. The generated fundus observation image may also be subjected to some processing, such as resizing, smoothing, or alignment, before it is generated.

[0058] Although the position adjustment of the face rest 130 and the optical head unit 100 is described in step S403, the positions of the face rest 130 and the optical head unit 100 can be adjusted even during visible light observation. This allows the examiner to check the anterior eye observation image and the visible light observation image displayed on the display unit 30, and adjust the positions of the face rest 130 and the optical head unit 100 so that the fundus position to be observed and photographed is displayed on the display unit 30.

[0059] Next, in step S408, the examiner determines whether to end the examination. The examiner performs visible light observation and visible light photography, and if the examiner determines to end the examination, ends the examination using the input unit or operation unit. The examination ends in step S413. If the examiner determines not to end the examination, the examiner does not perform any operation to end the examination. The process proceeds to step S409.

[0060] Next, in step S409, the examiner determines whether to start visible light imaging. The examiner checks the visible light observation image displayed on the display unit 30, and if he or she determines to perform visible light imaging, he or she starts visible light imaging using the input unit or operation unit. The control unit 20 detects that an operation to start visible light imaging has been performed, and the process proceeds to step S410. If the examiner determines that he or she does not yet want to perform visible light imaging, he or she does not perform an operation to start visible light imaging, and the process returns to step S407.

[0061] Next, in step S410, in order to perform visible light photography, the drive control unit 24 switches the lens baffle 205 to a lens baffle for visible light photography. More specifically, the drive control unit 24 switches the lens baffle 205 so that the light beam 510c shown in FIG. 8(c) is incident on the subject's eye. At this time, the movable light blocking unit 205b is inserted into the optical path. The lens baffle for visible light photography is a lens baffle used to illuminate a second region of the subject's eye with illumination light.

[0062] The incident method of the light beam 510c shown in Figure 8(c) has the advantage that flare is less likely to appear in the fundus image than the incident methods of the light beam 510d in Figure 8(d), the light beam 510e in Figure 8(e), and the light beam 510f in Figure 8(f), and is therefore more suitable for visible light photography.

[0063] Next, in step S411, in order to perform visible light photography, the control unit 20 causes the visible light source 201 to emit a flash. At this time, the light intensity of the visible light source 201 is increased for visible light photography. If the subject's eye is miotic, it is difficult for light to reach the fundus 303, so the amount of visible light is adjusted so that the brightness is sufficient to photograph the fundus with visible light.

[0064] Next, in step S412, the image generation unit 22 generates a fundus photographed image. More specifically, the acquisition unit 21 acquires a signal output from the two-dimensional image sensor 230, and the image generation unit 22 generates a fundus photographed image based on the acquired signal. The fundus photographed image is, for example, a still image and is an example of a second image. The generated fundus photographed image is displayed on the display unit 30 and stored in the memory unit 25. When visible light photography is completed, the process returns to step S405.

[0065] Although the examination flow for only one eye has been described here, it is also possible to perform a flow in which images are taken of both eyes consecutively. In this case, the above flow is executed for each of the right and left eyes.

[0066] In addition, in this embodiment, a method of changing the shape or position of the light beam by switching the lens baffle 205 has been described, but this is not limited to this, and for example, a method of switching a ring slit 204 that is approximately conjugate with the pupil 301 may also be used.

[0067] In this embodiment, the input of the subject information in step S401 also serves to indicate the start of the examination. However, the method for starting the examination is not limited to this, and for example, the start of the examination may be determined by turning on the power of the device. Alternatively, the start of the examination may be determined by providing a dedicated input, different from the subject information, from the input unit to indicate the start of the examination. Furthermore, the end of the previous examination may be determined to be the start of the next examination.

[0068] [Embodiment 2] In the first embodiment, a method for switching the incident light beam at the posterior surface 302 of the lens of the subject's eye E using the lens baffle 205 during visible light observation has been described. In contrast, in the second embodiment, as another example of changing the light beam incident on the subject's eye, a method for switching the incident light beam at the fundus 303 of the subject's eye E using a mask will be described with reference to the schematic diagrams of FIGS. 9 and 10, the flowchart of FIG. 11, and the schematic diagram of FIG. 12.

[0069] <Optical configuration of the device> First, the optical system of the fundus camera according to this embodiment will be described using the schematic diagram in Fig. 9. The optical system is composed of an observation optical system for observing the eye to be examined, or an imaging optical system for photographing the eye to be examined. The configuration of the optical system will be divided into multiple optical axes L1 to L4 on which various optical elements are arranged, and each will be described in turn.

[0070] A light source that emits light for observing or photographing the subject's eye and related components are arranged on the optical axis L1. This component is arranged along the optical path of the light emitted from the light source. A visible light source 201 for observation and photography, a condenser lens 202, and a mirror 203 are arranged on the optical axis L1.

[0071] On the optical axis L2 in the reflection direction of the mirror 203, a ring slit 204 having a ring-shaped opening, a lens baffle 205, a splitting unit 206, a relay lens 207, a cornea baffle 208, and a perforated mirror 209 having a central opening are arranged in this order from the mirror 203. A mask 206s is also arranged within the splitting unit. The ring slit 204 is arranged at a position that is approximately optically conjugate with the pupil 301 of the subject's eye E, the lens baffle 205 is arranged at a position that is approximately optically conjugate with the posterior surface 302 of the lens of the subject's eye E, the mask 206s is arranged at a position that is approximately optically conjugate with the fundus 303 of the subject's eye E, and the cornea baffle 208 is arranged at a position that is approximately optically conjugate with the cornea 300 of the subject's eye E.

[0072] An objective lens 211 is arranged on an optical axis L3 in the reflection direction of the perforated mirror 209, facing the subject's eye E. A photographing diaphragm 220 is arranged in the hole in the perforated mirror 209, and further behind it are a focus lens 212 that adjusts the focus by moving its position on the optical axis L3, a photographing lens 213, and a half mirror 214. A two-dimensional image sensor 230 that can be used for both observation in visible light and still image capture is arranged beyond the half mirror 214.

[0073] An internal fixation target 260 is disposed at the end of an optical axis L4, which is the direction of reflection from the half mirror 214.

[0074] Switchable mask control Next, control of the switchable mask according to this embodiment will be described with reference to FIG.

[0075] The split unit 206 is rotatable in the direction of the arrow around a fulcrum 206c and is composed of a focus index mask 206a for forming the outer shape of the focus index, and masks 206s-1 and 206s-2 for blocking light from specific regions of the fundus. The focus index mask 206a, mask 206s-1, and mask 206s-2 can be switched by inserting or removing them from the optical path. Inserting the focus index mask 206a into the optical path projects a focus index onto the pupil of the subject's eye E, and removing the focus index mask 206a from the optical path removes the focus index from the pupil. Inserting the mask 206s-1 into the optical path blocks light from reaching the right region of the fundus of the subject's eye E, and removing the mask 206s from the optical path allows light to reach the right region of the fundus as well. When the mask 206s-2 is inserted into the optical path, the left region of the fundus of the subject's eye E is shielded from light, and when the mask 206s-2 is removed from the optical path, the left region of the fundus is also exposed to light.

[0076] <Visible light observation and visible light photography flow> Next, a flow of visible light observation and visible light photography according to this embodiment will be described with reference to Fig. 11. Fig. 11 is a flowchart showing a series of processes for visible light observation and visible light photography according to this embodiment.

[0077] Step S601 is the same as step S401 described in the first embodiment, and therefore a detailed description thereof will be omitted here.

[0078] Next, in step S602, the control unit 20 turns on the visible light source 201 to acquire an anterior eye observation image.

[0079] Next, in step S603, the image generation unit 22 generates an image for anterior eye observation. More specifically, the acquisition unit 21 acquires a signal output from the two-dimensional image sensor 230, and the image generation unit 22 generates an image for anterior eye observation based on the acquired signal. The generated image for anterior eye observation is displayed on the display unit 30 and stored in the storage unit 25.

[0080] Next, in step S604, the examiner moves the face support unit 130 and the optical head unit 100 to predetermined positions using the input unit and the operation unit while viewing the anterior eye observation image displayed on the display unit 30. This step S604 is similar to step S403 described in the first embodiment, and therefore will not be described in detail here.

[0081] Next, in step S605, the control unit 20 determines whether visible light observation of the fundus is possible. More specifically, the image analysis unit 23 detects the position and size of the pupil from the generated anterior eye observation image, and the image analysis unit 23 calculates the relative distance between the subject's eye E and the optical head unit 100 from the detected position and size of the pupil, and the control unit 20 determines whether visible light observation of the fundus is possible. If the control unit 20 determines that visible light observation of the fundus is possible, the process proceeds to step S606. If the control unit 20 determines that visible light observation of the fundus is not possible, the process returns to step S603. Note that in this embodiment, the control unit 20 determines whether visible light observation of the fundus is possible, but this is not limited thereto, and the examiner may determine whether visible light observation of the fundus is possible.

[0082] Next, in step S606, in order to perform visible light observation of the fundus, the drive control unit 24 switches the mask 206s to a mask for visible light observation of the fundus.

[0083] Switching of the mask 206s will be described with reference to the schematic diagram of Fig. 12. Fig. 12 is a schematic diagram showing an example of a change in the light-blocking area on the fundus when switching the mask according to this embodiment.

[0084] When observing the fundus 303 of the left eye, focusing on the posterior pole (the deepest part when viewed from the front), the fundus as shown in Figure 12(a) can be confirmed. The optic disc 700 is located to the left (nasal side) of the center, and the macula 702 is located on the opposite side of the optic disc 700, with the fovea 701 at its center. The optic disc, fovea, and macula can be confirmed in the right eye, symmetrically to the left eye. The optic disc 700 is a bundle of retinal optic nerve fibers and does not perceive brightness because it does not contain photoreceptors that distinguish color or brightness. In contrast, the macula 702, centered on the fovea 701, is highly sensitive to brightness because it contains many photoreceptors that distinguish color and light. Therefore, when strong light hits the macula 702, the subject perceives it as being too bright and undergoes miosis. Therefore, when performing visible light observation, the mask 206s is switched to block the light-shielding region 720b shown in Figure 12(b) to prevent miosis of the subject's eye. At this time, the mask 206s-1 is inserted into the optical path. The light-blocking region 720b in FIG. 12(b) overlaps the half of the fundus including the macula 702 shown in FIG. 12(a). As a result, light reaches the half of the fundus including the optic disc 700, but does not reach the half of the fundus including the macula 702 (the light beam strikes the half of the fundus including the optic disc 700, but does not strike the half of the fundus including the macula 702). As a result, the subject does not feel dazzled, and miosis of the subject's eye is suppressed. Furthermore, when the subject's eye is the right eye, the half of the fundus including the macula 702 can be shielded from light by inserting the mask 206s-2 into the optical path.

[0085] In this embodiment, when performing visible light observation, the mask 206s is switched to block the light-shielding region 720b shown in Figure 12(b), but this is not limited thereto. For example, the mask may be switched to block the light-shielding region 720c shown in Figure 12(c). The light-shielding region 720c in Figure 12(c) does not block half of the fundus including the macula 702 as in the light-shielding region 720b, but has a narrower light-shielding area so that only the macula 702 is blocked. This can be achieved by changing the shape of the mask 206s.

[0086] Next, in step S607, in order to perform visible light observation of the fundus, the control unit 20 adjusts the light intensity of the visible light source 201. Although many photoreceptor cells are concentrated in the macula 702, photoreceptor cells are also present in areas other than the macula 702. Therefore, the amount of visible light is adjusted to minimize miosis and to provide a brightness that allows visible light observation of the fundus with the incident light flux switched in step S606.

[0087] Steps S608, S609, and S610 are similar to steps S407, S408, and S409 described in the first embodiment, and therefore will not be described in detail here.

[0088] Next, in step S611, in order to perform visible light photography, the drive control unit 24 switches the mask 206s to one for visible light photography. More specifically, the drive control unit 24 switches the mask 206s to stop blocking light from the light-shielded region 720b shown in FIG. 12(b). At this time, the mask 206s-1 is removed from the optical path. By stopping the light-shielded region 720b shown in FIG. 12(b), it becomes possible to photograph the entire fundus, including the macula, as shown in FIG. 12(a), which is more suitable for visible light photography.

[0089] Next, in step S612, in order to perform visible light photography, the control unit 20 causes the visible light source 201 to emit a flash. At this time, the light intensity of the visible light source 201 is increased for visible light photography. The amount of visible light is adjusted so that the visible light photographed image of the fundus will be clearer and brighter.

[0090] Next, in step S613, the image generation unit 22 generates a fundus image. More specifically, the acquisition unit 21 acquires a signal output from the two-dimensional image sensor 230, and the image generation unit 22 generates a fundus image based on the acquired signal. The generated fundus image is displayed on the display unit 30 and stored in the storage unit 25. When visible light imaging is completed, the process returns to step S606.

[0091] In this embodiment, the mask 206s is provided to block the light beam impinging on the macula 702. However, a filter that changes the transmittance of the light beam may also be provided. For example, a filter with low transmittance may be switched to reduce (attenuate) the amount of light impinging on the position 730a shown in FIG. 13(a) or the position 730b shown in FIG. 13(b). This reduces the amount of light impinging on the macula 702, making the subject less likely to feel dazzled and preventing the subject's eye from constricting. At the same time, although the attenuated portion becomes dark, the entire fundus, including the macula, can be observed.

[0092] Furthermore, in the present embodiment, a method for switching the mask 206s so as to shield the macula 702 from light has been described. However, the method for switching the mask 206s is not limited thereto. For example, the mask 206s may be dynamically switched at predetermined intervals. The mask 206s may be switched between shielding and non-shielding in accordance with the imaging frame rate of the two-dimensional image sensor 230. The macula 702 cannot be observed in an image captured in a shielded state, but can be observed in an image captured without shielding. For example, a moving image can be generated by alternately acquiring images captured with and without shielding, and overlaying (superimposing) the acquired images. This allows the generation of a moving image in which the macula 702 can also be observed. Note that the process of generating a moving image by overlaying an image captured with and without shielding may be performed by, for example, the image generation unit 22. In other words, the image generation unit 22 is an example of a generating unit.

[0093] [Embodiment 3] In the first embodiment, a method for switching the incident light beam on the posterior surface 302 of the lens of the subject's eye E using the lens baffle 205 when performing visible light observation was described. In contrast, in the third embodiment, as another example of changing the light beam incident on the subject's eye, a method for switching the incident light beam on the posterior surface 302 of the lens of the subject's eye E and the fundus 303 using the lens baffle 205 will be described using the schematic diagram of Fig. 14, the flowchart of Fig. 15, and the schematic diagram of Fig. 16. Note that the optical configuration in the third embodiment is similar to the optical configuration described in the first embodiment, and therefore a detailed description thereof will be omitted here.

[0094] Switchable crystal baffle control First, the control of the switchable lens baffle according to this embodiment will be described with reference to FIG.

[0095] The lens baffle 205 is composed of a fixed light-shielding portion 205a having a light-shielding portion in the center, and a movable light-shielding portion 205b that can rotate in the direction of the arrow around a fulcrum 205c and covers the light-shielding portion 205a. This configuration is the same as the configuration of the lens baffle described in embodiment 1. In addition, a movable light-shielding portion 205f that can move in two dimensions is configured. By moving the movable light-shielding portion 205f in two dimensions, it is possible to block light at any position on the optical path.

[0096] <Fundus imaging sequence> Next, a flow of visible light observation and visible light photography according to this embodiment will be described with reference to Fig. 15. Fig. 15 is a flowchart showing a series of processes for visible light observation and visible light photography according to this embodiment.

[0097] Steps S801, S802, S803, and S804 are similar to steps S401, S402, S403, and S404 described in the first embodiment, and therefore will not be described in detail here.

[0098] Next, in step S805, the drive control unit 24 switches the crystalline lens baffle 205 for visible light observation in order to perform visible light observation.

[0099] The switching of the crystal baffle 205 will be described with reference to the schematic diagram of Fig. 16. Fig. 16 is a schematic diagram showing an example of a change in light flux when the crystal baffle according to this embodiment is switched.

[0100] When performing visible light observation, the lens baffle 205 is switched so that the light beam 910a shown in FIG. 16(a-1) is incident on the subject's eye. At this time, the movable light blocking unit 205b is removed from the optical path, and the movable light blocking unit 205f is inserted to block the right side of the optical path. When the subject's eye is the left eye, the light beam 910a passes only through the left side (nasal side) of the pupil. As shown in FIG. 16(a-2), sufficient light reaches the half of the fundus including the optic disc 700, but the half of the fundus 920a including the macula 702 is poorly illuminated. This reduces the amount of light hitting the macula 702, reducing the perceived glare and suppressing miosis. Furthermore, the light blocking area on the inner side of the light beam 910a is narrowed so that the light passes closer to the inner side of the pupil. This allows for better visible light observation by brightening the half of the fundus including the optic disc 700 even if the subject's eye is miotic. At the same time, visible light observation of the half of the fundus 920a including the macula 702 is also possible, although it is dark.

[0101] In this embodiment, when performing visible light observation, the lens baffle 205 is switched so that the light beam 910a shown in FIG. 16(a-1) is incident on the subject's eye. However, this is not limiting. For example, the light beam 910b shown in FIG. 16(b-1) may be switched. As shown in FIG. 16(b-2), the light beam 910b in FIG. 16(b-1) is split into left and right beams so that light is less likely to reach a certain region 920b including the macula 702. This reduces the amount of light hitting the macula 702, making it less likely to be dazzled and reducing miosis. Furthermore, the light beam 910b has a narrower light-blocking area on the inner side of the beam so that light passes closer to the pupil. This allows the entire fundus, except for the certain region including the pupil 702, to be brightened even when the subject's eye has constricted. This allows for better visible light observation. At the same time, although it is dark, it is also possible to observe with visible light a certain region 920b including the macula 702. This can be achieved by changing the shape of the movable light blocking portion 205f.

[0102] Next, in step S806, the control unit 20 turns on the visible light source 201 to perform visible light observation. At this time, the light intensity of the visible light source 201 is reduced for visible light observation. Since visible light is more likely to cause glare than infrared light, the amount of visible light is adjusted to minimize pupil constriction and to provide a brightness that allows visible light observation of the fundus in the incident light flux switched in step S805.

[0103] Next, in step S807, the image generating unit 22 generates a fundus observation image. Step S807 is the same as step S407 described in the first embodiment, and therefore a detailed description thereof will be omitted here.

[0104] Next, in step S808, the image analysis unit 23 analyzes the fundus observation image to identify characteristic parts of the fundus (positions of the optic disc and macula). More specifically, the image analysis unit 23 analyzes the fundus observation image generated in step S807 to identify characteristic parts of the fundus (positions of the optic disc and macula). The image analysis unit 23 is an example of an identification unit.

[0105] Next, in step S809, the drive control unit 24 switches the lens baffle 205 based on the analyzed positions of the optic disc and macula. More specifically, the lens baffle 205 is switched so that light is less likely to hit the macula 702. At this time, the position of the movable light blocking unit 205f is moved to block light at a desired position on the optical path. This makes it possible to appropriately reduce (dim) the amount of light hitting the macula 702 even if the position of the subject's eye or the line of sight changes.

[0106] Steps S810 and S811 are similar to steps S408 and S409 described in the first embodiment, and therefore will not be described in detail here.

[0107] Next, in step S812, in order to perform visible light photography, the drive control unit 24 switches the lens baffle 205 for visible light photography. More specifically, the drive control unit 24 switches the lens baffle 205 so that the light beam 510c shown in FIG. 8(c) is incident on the subject's eye. At this time, the movable light blocking unit 205b is inserted into the optical path, and the movable light blocking unit 205f is removed from the optical path. This makes it less likely for flare to occur and makes it possible to capture a fundus image including the macula, making it more suitable for visible light photography.

[0108] Steps S813, S814, and S815 are similar to steps S411, S412, and S413 described in the first embodiment, and therefore will not be described in detail here.

[0109] In the present embodiment, a method for analyzing a fundus observation image and switching the lens baffle 205 based on the results has been described. However, the method for switching the lens baffle 205 is not limited to this. For example, the lens baffle 205 may be switched according to the position of a fixation target. Since the line of sight can be roughly determined from the position of the fixation target, the positions of the optic disc and macula can be roughly determined from the line of sight. Furthermore, for example, the lens baffle 205 may be switched by analyzing an anterior eye observation image. The position and shape of the pupil can be analyzed from the anterior eye observation image, and the positions of the optic disc and macula can be roughly determined from the position and shape of the pupil. Furthermore, for example, the anterior eye observation image may be analyzed to detect the size of the pupil, and the lens baffle 205 may be switched according to the pupil size. If the pupil size is small, the light beam may be narrowed to reduce the amount of light so as to prevent further pupil constriction.

[0110] As described above, the ophthalmologic apparatus according to this embodiment appropriately switches the light beam when performing visible light observation. This suppresses miosis of the subject's eye or brightens the fundus even if miosis occurs, enabling better visible light observation. Furthermore, during fundus examinations, mydriatics are sometimes used to prevent miosis even when dazzling light is applied. However, according to the present disclosure, it is possible to suppress miosis of the subject's eye or brighten the fundus even if miosis occurs, enabling better visible light observation. This can reduce the amount of mydriatics used or even eliminate the need for mydriatics. Risks associated with the use of mydriatics include headaches, drug allergies, and acute glaucoma attacks, which can be a significant burden on the subject. Therefore, reducing the amount of mydriatics used or eliminating their use is a significant benefit.

[0111] (Other embodiments) The disclosed technology can also be realized by executing the following process. That is, the disclosed technology can also be realized by supplying software (programs) that realize one or more functions of the various embodiments described above to a system or device via a network or a storage medium, and having a computer (or a CPU, MPU, or the like) of the system or device read and execute the programs. The computer has one or more processors or circuits, and may include multiple separate computers or a network of multiple separate processors or circuits to read and execute computer-executable instructions. In this case, the processor or circuit may include a central processing unit (CPU), a microprocessing unit (MPU), a graphics processing unit (GPU), an application-specific integrated circuit (ASIC), or a field-programmable gateway (FPGA). The processor or circuit may also include a digital signal processor (DSP), a data flow processor (DFP), or a neural processing unit (NPU).

[0112] (Configuration 1) An ophthalmic apparatus for photographing an eye to be examined by illuminating the eye with illumination light, When capturing a first image of the subject's eye, the illumination light is applied to a first region of the subject's eye; An ophthalmic apparatus comprising an illumination means for illuminating a second area having a different shape from the first area with illumination light having a different shape from the shape of the light beam of illumination light illuminating the first area when capturing a second image of the subject's eye.

[0113] (Configuration 2) 2. The ophthalmologic apparatus according to claim 1, wherein the first image is a moving image used to observe a fundus, and the second image is a still image used to photograph the fundus.

[0114] (Configuration 3) 3. The ophthalmologic apparatus according to configuration 1 or 2, wherein the illumination means changes the first area and the second area by changing the shape of a light beam of the illumination light.

[0115] (Configuration 4) 4. The ophthalmologic apparatus according to any one of configurations 1 to 3, wherein the illumination means changes the shape of the light beam by blocking or attenuating at least a part of the illumination light.

[0116] (Configuration 5) 5. The ophthalmologic apparatus according to any one of configurations 1 to 4, wherein the area of ​​the first region is smaller than the area of ​​the second region.

[0117] (Configuration 6) 6. The ophthalmologic apparatus according to any one of configurations 1 to 5, wherein the first region does not include the macula of the subject's eye, and the second region includes the macula of the subject's eye.

[0118] (Configuration 7) the illumination means has a light beam changing means at a position conjugate with any one of the posterior surface of the crystalline lens of the eye to be examined, the fundus of the eye to be examined, and the pupil of the eye to be examined, 7. The ophthalmologic apparatus according to any one of configurations 1 to 6, wherein the light beam changing means changes the shape of the light beam of the illumination light to change the first area and the second area.

[0119] (Configuration 8) further comprising an identifying unit that identifies a characteristic portion of the subject's eye from the first image, An ophthalmic device according to any one of configurations 1 to 7, wherein the illumination means changes the first area and the second area by changing the shape of the light beam of the illumination light based on the position of the identified feature.

[0120] (Configuration 9) a fixation target indicating a target position of the line of sight of the subject's eye; An ophthalmic device according to any one of configurations 1 to 8, wherein the illumination means changes the first area and the second area by changing the shape of the light beam of the illumination light based on the target position displayed by the fixation target.

[0121] (Configuration 10) The camera further includes a generating unit that generates an image in which the first image and the second image captured alternately at a predetermined interval are superimposed, 10. The ophthalmologic apparatus according to any one of configurations 1 to 9, wherein the illumination means changes the shape of the luminous flux of the illumination light at the predetermined intervals to change the first area and the second area.

[0122] (Method 1) 1. A control method for an ophthalmic apparatus that photographs an eye to be examined by illuminating the eye with illumination light, comprising: When capturing a first image of the subject's eye, the illumination light is applied to a first region of the subject's eye; A control method for an ophthalmologic apparatus, comprising an illumination step of illuminating a second region having a shape different from that of the first region with the illumination light when capturing a second image of the subject's eye.

[0123] (Program 1) A program that causes a computer to execute the method for controlling an ophthalmologic apparatus according to Method 1. [Explanation of symbols]

[0124] 10. Photography Department 20 Control Unit 30 Display section 100 Optical head unit 110 Stage Section 120 base 130 Face support

Claims

1. An ophthalmic apparatus for photographing an eye to be examined by illuminating the eye with illumination light, When capturing a first image of the subject's eye, the illumination light is applied to a first region of the subject's eye; An ophthalmic apparatus comprising an illumination means for illuminating a second area having a different shape from the first area with illumination light having a different shape from the shape of the light beam of illumination light illuminating the first area when capturing a second image of the subject's eye.

2. 2. The ophthalmologic apparatus according to claim 1, wherein the first image is a moving image used for observing the fundus, and the second image is a still image used for photographing the fundus.

3. 2. The ophthalmologic apparatus according to claim 1, wherein the illumination means changes the shape of the luminous flux of the illumination light to change the first area and the second area.

4. The ophthalmic apparatus according to claim 1 , wherein the illumination means changes the shape of the light beam by blocking or attenuating at least a part of the illumination light.

5. The ophthalmologic apparatus according to claim 1 , wherein the area of ​​the first region is smaller than the area of ​​the second region.

6. The ophthalmologic apparatus according to claim 1 , wherein the first region does not include the macula of the subject's eye, and the second region includes the macula of the subject's eye.

7. the illumination means has a light beam changing means at a position conjugate with any one of the posterior surface of the crystalline lens of the eye to be examined, the fundus of the eye to be examined, and the pupil of the eye to be examined, 2. The ophthalmic apparatus according to claim 1, wherein the light beam changing means changes the shape of the light beam of the illumination light to change the first area and the second area.

8. an identifying unit that identifies a characteristic portion of the subject's eye from the first image; The ophthalmologic apparatus according to claim 1 , wherein the illumination unit changes the shape of the luminous flux of the illumination light based on the position of the identified characteristic portion, thereby changing the first region and the second region.

9. a fixation target indicating a target position of the line of sight of the subject's eye; 2. The ophthalmologic apparatus according to claim 1, wherein the illumination means changes the shape of the luminous flux of the illumination light based on the target position displayed by the fixation target, thereby changing the first area and the second area.

10. The camera further includes a generating unit that generates an image in which the first image and the second image, which are alternately captured at a predetermined interval, are superimposed, 2. The ophthalmologic apparatus according to claim 1, wherein the illumination means changes the shape of the luminous flux of the illumination light at the predetermined intervals to change the first area and the second area.

11. 1. A control method for an ophthalmic apparatus that photographs an eye to be examined by illuminating the eye with illumination light, comprising: When capturing a first image of the subject's eye, the illumination light is applied to a first region of the subject's eye; A control method for an ophthalmologic apparatus, comprising an illumination step of illuminating a second region having a shape different from that of the first region with the illumination light when capturing a second image of the subject's eye.

12. A program that causes a computer to execute the method for controlling an ophthalmologic apparatus according to claim 11.

Images