Ophthalmic device, method for controlling ophthalmic device, and program

Abstract

To provide a new technique to acquire an image of an eye to be examined of high image quality easily even when a field angle is large.SOLUTION: An ophthalmologic apparatus includes an irradiation system, a light reception system, a control unit, and an image forming unit. The irradiation system includes a first slit in which a slit is formed in a center region and which can rotate around an imaging optical axis; and one or more second slits in which a slit is formed in one or more peripheral regions and which can rotate around an imaging optical axis, and emits illumination light to an illumination range that rotates around an imaging center in a predetermined part of the eye to be examined. The control unit controls the irradiation system and the light reception system so as to execute a central part scan for scanning a cental part with illumination light, and one or more peripheral part scans for respectively scanning one or more peripheral parts with illumination light. The image forming unit forms an image of the eye to be examined on the basis of a light reception result on the return light acquired by the central part scan and the one or more peripheral part scans. The control unit adjusts a position of the one or more second slits with respect to the first slit according to the refractivity of the eye to be examined.SELECTED DRAWING: Figure 9A

Description

[Technical field]

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

[0002] A scanning laser ophthalmoscope (SLO) scans the inside of the eye with a laser beam and obtains an image of the fundus by detecting the light reflected from the fundus.

[0003] When a wide-angle fundus image is acquired using such an SLO, the image is affected by aberrations in the ocular optical system as described in Non-Patent Document 1, causing focus deviations in the outer periphery outside the central area including the center of the image. This means that when the focus is set on the central area, image quality degradation in the outer periphery becomes noticeable.

[0004] For example, Patent Document 1 discloses a method for obtaining tomographic images with the same sensitivity in a fundus tomography device that uses an optical scanner to scan the fundus with measurement light by adjusting the optical path for each shooting position of each circle scan, thereby obtaining tomographic images with good sensitivity in the entire shooting area.

[0005] It is also known that when a fundus image is acquired using SLO, artifacts caused by reflection components from the center of the objective lens may be depicted in the fundus image.

[0006] For example, Patent Document 2 discloses a method for removing artifacts caused by reflected components from the center of the objective lens by appropriately setting the dimensions of the dead zone between the irradiation zone and the detection zone on the pupil division plane. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2013-081763 A [Patent Document 2] US Patent No. 10582852 [Non-patent literature]

[0008] [Non-Patent Document 1] David A. Atchison, “Anterior Corneal and internal contributions to peripheral aberrations of human eyes”, Optical Society of America, March 2004, Vol. 21, No. 3, pp.355-359 Summary of the Invention [Problem to be solved by the invention]

[0009] For example, as in Patent Document 1, when performing a circle scan in SLO and adjusting the focus for each shooting position in the central area including the shooting center and the peripheral area outside the central area, the focus adjustment takes time, leading to deterioration of image quality due to the movement of the subject's eye, etc. In addition, when scanning the fundus with light having a predetermined shape such as a line-shaped cross section of the light beam, the focus position is different between the area including the shooting center and the area away from the shooting center within the illumination area of ​​the fundus. Therefore, it is difficult to avoid deterioration of image quality due to aberrations of the ocular optical system. The larger the angle of view, the greater the degree of deterioration of image quality due to aberrations of the ocular optical system.

[0010] On the other hand, the method disclosed in Patent Document 2 can remove artifacts caused by reflection components from the center of the objective lens, but cannot avoid degradation of image quality caused by aberrations in the ocular optical system.

[0011] As described above, with the conventional methods, it is difficult to easily obtain a high-quality image of the subject's eye even if the angle of view is large.

[0012] The present invention has been made in consideration of the above circumstances, and one of its objectives is to provide a new technology for easily obtaining a high-quality image of a test eye even when the angle of view is large. [Means for solving the problem]

[0013] A first aspect of the embodiment is an ophthalmic device including: an illumination system that irradiates illumination light onto an illumination range rotating around an imaging center at a predetermined portion of the test eye; a light receiving system including an image sensor whose light receiving surface can be positioned at a position that is approximately optically conjugate with the predetermined portion and that receives return light of the illumination light irradiated onto the illumination range; a control unit that controls the illumination system and the light receiving system to perform a central scan that scans a central area including the imaging center with the illumination light, and one or more peripheral scans that scan each of one or more peripheral areas outside the central area with the illumination light; and an image forming unit that forms an image of the test eye based on a light receiving result of the return light obtained by the central scan and a light receiving result of the return light obtained by the one or more peripheral scans.

[0014] In a second aspect of the embodiment, in the first aspect, the control unit controls at least one of the illumination system and the light receiving system so that the difference between the amount of returned light obtained by the central area scan and the amount of returned light obtained by the one or more peripheral area scans is reduced.

[0015] In a third aspect according to the first or second aspect, the illumination system and the light receiving system are movable in a direction of an imaging optical axis.

[0016] A fourth aspect according to the embodiment is any one of the first to third aspects, further comprising lenses that are disposed in an optical path of the illumination system and an optical path of the light receiving system and are movable along the optical paths.

[0017] A fifth aspect of the embodiment is, in any of the first to fourth aspects, a pupil division rotating mirror having a hole formed at a position eccentric to the imaging optical axis, which connects the optical path of the illumination system and the optical path of the light receiving system, wherein the hole can be positioned at a position that is approximately optically conjugate with the pupil of the test eye, and the pupil division rotating mirror can rotate the hole around the imaging optical axis in synchronization with movement of the illumination range.

[0018] A sixth aspect of the embodiment is characterized in that, in the fifth aspect, a slit is formed that can rotate around the shooting optical axis, and includes two or more slits that can be selectively positioned in an optical path combined by the pupil splitting rotating mirror, the two or more slits including a first slit having a slit formed in a central region through which the shooting optical axis passes, and one or more second slits having slits formed in each of one or more peripheral regions outside the central region through which the shooting optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slit formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with the one or more peripheral regions at the specified location.

[0019] A seventh aspect of the embodiment, in the fifth aspect, includes an optical path splitting member that splits the optical path combined by the pupil division rotating mirror into two or more optical paths, two or more slits that are arranged in each of the two or more optical paths divided by the optical path splitting member and have slits formed therein that can rotate around the imaging optical axis, and an optical path combining member that combines the two or more optical paths divided by the optical path splitting member and guides the light of the combined optical path to the test eye, wherein the two or more slits include a first slit that is formed in a central region through which the imaging optical axis passes, and one or more second slits that are formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slits formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with the one or more peripheral regions at the specified location.

[0020] An eighth aspect of the embodiment is the fifth aspect, which includes two or more slits in which a slit is formed and which can be selectively positioned in an optical path combined by the pupil division rotating mirror, and an optical scanner which is positioned between the pupil division rotating mirror and the two or more slits and which deflects light which has passed through a slit formed in any of the two or more slits so as to rotate around the shooting center at the specified location, wherein the two or more slits include a first slit in which a slit is formed in a central region through which the shooting optical axis passes, and one or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the shooting optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the center, and the slit formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with the one or more peripheral regions at the specified location.

[0021] In a ninth aspect according to the embodiment, in any one of the sixth to eighth aspects, the two or more slits are movable in the direction of the imaging optical axis except for any one of the two or more slits.

[0022] A tenth aspect of the embodiment, in any of the sixth to ninth aspects, includes one or more moving mechanisms that move each of the one or more second slits in the direction of the imaging optical axis based on the refractive power of the test eye.

[0023] An eleventh aspect of the embodiment, in any of the sixth to tenth aspects, includes one or more moving mechanisms that move each of the one or more second slits in the direction of the imaging optical axis based on OCT data of the test eye.

[0024] In a twelfth aspect of the embodiment, in any of the sixth to eleventh aspects, the slits formed in each of the two or more slits are formed so as to become wider as they become farther from the imaging optical axis.

[0025] In a thirteenth aspect according to the present invention, in the twelfth aspect, each of the two or more slits has a substantially trapezoidal or triangular shape.

[0026] A fourteenth aspect of the embodiment is a control method for an ophthalmic device, including an irradiation step of irradiating illumination light onto an illumination range rotating around an imaging center at a specified location of the test eye, a light receiving step of receiving return light of the illumination light irradiated onto the illumination range using an image sensor whose light receiving surface can be positioned at a position approximately optically conjugate with the specified location, a control step of performing a central scan of scanning a central area including the imaging center with the illumination light and one or more peripheral scans of scanning each of one or more peripheral areas outside the central area with the illumination light, and an image formation step of forming an image of the test eye based on a light receiving result of the return light obtained by the central scan and a light receiving result of the return light obtained by the one or more peripheral scans.

[0027] In a 15th aspect of the embodiment, in the 14th aspect, the control step controls at least one of an illumination system that irradiates the illumination light and a light receiving system that receives the returning light so that the difference between the amount of returning light obtained by the central area scan and the amount of returning light obtained by the one or more peripheral area scans is reduced.

[0028] In a 16th aspect of the embodiment, in the 14th or 15th aspect, the ophthalmic device includes a pupil-splitting rotating mirror having a hole formed at a position eccentric to the imaging optical axis, which connects the optical path of an illumination system that irradiates the illumination light and the optical path of a light-receiving system that receives the returning light, the hole can be positioned at a position that is approximately optically conjugate with the pupil of the test eye, and the control step controls the pupil-splitting rotating mirror to rotate the hole around the imaging optical axis in synchronization with the movement of the illumination range.

[0029] In a 17th aspect of the embodiment, in the 16th aspect, the ophthalmic device includes two or more slits that are formed with a slit that can rotate around the imaging optical axis and can be selectively positioned in an optical path combined by the pupil splitting rotating mirror, the two or more slits including a first slit in a central region through which the imaging optical axis passes, and one or more second slits in which a slit is formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slit formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with the one or more peripheral regions at the specified location.

[0030] In an 18th aspect of the embodiment, in the 16th aspect, the ophthalmic apparatus includes an optical path splitting member that splits the optical path combined by the pupil splitting rotating mirror into two or more optical paths, two or more slits that are arranged in each of the two or more optical paths divided by the optical path splitting member and have slits formed therein that can rotate around the imaging optical axis, and an optical path combining member that combines the two or more optical paths divided by the optical path splitting member and guides the light of the combined optical path to the test eye, wherein the two or more slits include a first slit that is formed in a central region through which the imaging optical axis passes, and one or more second slits that are formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slits formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with the one or more peripheral portions at the specified site.

[0031] In a 19th aspect of the embodiment, in the 16th aspect, the ophthalmic device includes two or more slits in which a slit is formed and which can be selectively positioned in an optical path combined by the pupil division rotating mirror, and an optical scanner which is positioned between the pupil division rotating mirror and the two or more slits and deflects light which has passed through a slit formed in any of the two or more slits so as to rotate around the shooting center at the specified location, wherein the two or more slits include a first slit in which a slit is formed in a central region through which the shooting optical axis passes, and one or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the shooting optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slit formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with the one or more peripheral regions at the specified location.

[0032] In a twentieth aspect according to the present embodiment, in any one of the seventeenth to nineteenth aspects, the slits formed in each of the two or more slits are formed so as to become wider as they become farther from the imaging optical axis.

[0033] In a twenty-first aspect according to the present invention, in the twentieth aspect, each of the two or more slits has a substantially trapezoidal or triangular shape.

[0034] A twenty-second aspect of the embodiment is a program for causing a computer to execute each step of the control method for an ophthalmic apparatus according to any one of the fourteenth to twenty-first aspects.

[0035] The configurations according to the above-described multiple aspects can be combined in any desired manner. Effect of the Invention

[0036] According to the present invention, it is possible to provide a new technique for easily acquiring a high-quality image of a subject's eye even when the angle of view is large. [Brief description of the drawings]

[0037] [Figure 1] 1 is a schematic diagram illustrating an example of the configuration of an ophthalmologic apparatus according to a first embodiment. [Diagram 2] 1 is a schematic diagram illustrating an example of the configuration of an ophthalmologic apparatus according to a first embodiment. [Diagram 3] 1 is a schematic diagram illustrating an example of the configuration of an ophthalmologic apparatus according to a first embodiment. [Figure 4A] 1 is a schematic diagram illustrating an example of the configuration of an ophthalmologic apparatus according to a first embodiment. [Figure 4B] 1 is a schematic diagram illustrating an example of the configuration of an ophthalmologic apparatus according to a first embodiment. [Diagram 5] FIG. 4 is a schematic diagram for explaining an operation of an ophthalmologic apparatus according to a comparative example of the first embodiment. [Figure 6] FIG. 4 is a schematic diagram for explaining the operation of an ophthalmologic apparatus according to a comparative example of the first embodiment. [Figure 7] FIG. 2 is a schematic diagram for explaining the operation of the ophthalmologic apparatus according to the first embodiment. [Figure 8] FIG. 2 is a schematic diagram for explaining the operation of the ophthalmologic apparatus according to the first embodiment. [Figure 9A] 4 is a flowchart illustrating an example of an operation of the ophthalmologic apparatus according to the first embodiment. [Figure 9B] 4 is a flowchart illustrating an example of an operation of the ophthalmologic apparatus according to the first embodiment. [Figure 10] FIG. 2 is a schematic diagram for explaining the operation of the ophthalmologic apparatus according to the first embodiment. [Figure 11] FIG. 11 is a schematic diagram showing an example of the configuration of an ophthalmologic apparatus according to a second embodiment. [Figure 12] FIG. 11 is a schematic diagram showing an example of the configuration of an ophthalmologic apparatus according to a third embodiment. [Figure 13] FIG. 11 is a schematic diagram showing an example of the configuration of an ophthalmologic apparatus according to a third embodiment. [Figure 14A] 13 is a flowchart illustrating an example of an operation of the ophthalmologic apparatus according to the third embodiment. [Figure 14B] 13 is a flowchart illustrating an example of an operation of the ophthalmologic apparatus according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] An example of an embodiment of an ophthalmic apparatus, a control method for an ophthalmic apparatus, and a program according to the present invention will be described in detail with reference to the drawings. Note that in the embodiment, the techniques described in the documents cited in this specification can be arbitrarily used.

[0039] The ophthalmic apparatus according to the embodiment has a function of a scanning laser ophthalmoscope (SLO) that scans a predetermined portion of the subject's eye with illumination light and forms a front image of the subject's eye based on the result of receiving return light of the illumination light from the predetermined portion. SLO includes point scan SLO that scans a predetermined portion with spot-shaped light and line scan SLO that scans a predetermined portion with line-shaped light. The configuration according to the embodiment described below is applicable to both point scan SLO and line scan SLO.

[0040] Specifically, the ophthalmic device executes a central scan and one or more peripheral scans. In the central scan, a central portion including an arbitrarily settable imaging center in a predetermined portion of the subject's eye is scanned with illumination light such that an illumination range rotates around the imaging center. In the one or more peripheral scans, one or more peripheral portions (e.g., annular or arc-shaped) outside the central portion in a predetermined portion of the subject's eye are each scanned with illumination light such that an illumination range rotates around the imaging center. The ophthalmic device forms an image of the subject's eye based on the light receiving result of the return light obtained by the central scan and the light receiving result of the return light obtained by the one or more peripheral scans.

[0041] This makes it possible to scan the central portion and one or more peripheral portions of a predetermined portion of the subject's eye with illumination light whose focus positions are adjusted independently of each other. As a result, even if the angle of view is large, an image of the subject's eye that is in focus over the entire predetermined portion can be easily obtained.

[0042] Furthermore, the ophthalmic apparatus scans the central area with illumination light so that the illumination range rotates around the center of the image capture at the specified site (central area scan). This weakens the intensity of the reflected component from the center of the objective lens, etc., and can eliminate artifacts caused by the reflected component. Therefore, it becomes possible to easily obtain a high-quality image of the subject's eye even when the angle of view is large.

[0043] An example of the imaging center is a position at a predetermined part of the subject's eye that intersects with the imaging optical axis (for example, the optical axis of an illumination system that irradiates illumination light, or the optical axis of a light receiving system that receives return light of the illumination light). Examples of the predetermined part of the subject's eye are the fundus, the anterior segment, etc.

[0044] The control method of the ophthalmic apparatus according to the embodiment includes one or more steps of controlling the above-mentioned ophthalmic apparatus. The program according to the embodiment causes a computer (processor) to execute each step of the control method of the ophthalmic apparatus according to the embodiment. The recording medium according to the embodiment is a non-transitory recording medium (storage medium) on which the program according to the embodiment is recorded.

[0045] In this specification, the processor includes circuits such as a central processing unit (CPU), a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), a field programmable gate array (FPGA)), etc. The processor realizes the functions of the embodiment by, for example, reading and executing a program stored in a memory circuit or a storage device. The memory circuit or storage device may be included in the processor. Furthermore, the memory circuit or storage device may be provided outside the processor.

[0046] An ophthalmologic apparatus according to some embodiments has a function of projecting a fixation target onto the fundus. The fixation target may be an internal fixation target or an external fixation target.

[0047] Hereinafter, the ophthalmologic apparatus will be described in the case where it acquires an image of the fundus of the subject's eye, but the configuration according to the embodiment is not limited thereto. The ophthalmologic apparatus according to the embodiment can also be applied to the case where it acquires an image of a predetermined part (for example, an anterior part) of the subject's eye other than the fundus.

[0048] Unless otherwise specified, the left-right direction as seen by the subject is defined as the X direction, the up-down direction as the Y direction, and the front-back direction (depth direction) as the Z direction. The X direction, Y direction, and Z direction define a three-dimensional orthogonal coordinate system.

[0049] First Embodiment [composition] FIG. 1 shows a block diagram of an example of the configuration of an ophthalmic apparatus according to the first embodiment.

[0050] The ophthalmic device 1 of the first embodiment scans the fundus Ef of the test eye E with illumination light so that an illumination range of a predetermined shape rotates around an arbitrarily settable shooting center at the fundus Ef, and acquires an image of the fundus Ef by receiving the illumination light from the fundus Ef.

[0051] The ophthalmologic apparatus 1 includes an optical system (apparatus optical system) 10, a control unit 100, a data processing unit 200, an operation unit 110, a display unit 120, movement mechanisms 10D, 50D, and 70D, and rotation mechanisms 40R and 50R.

[0052] The optical system 10 scans the fundus Ef with illumination light so that an illumination area of ​​a predetermined shape rotates around the center of photography.

[0053] The optical system 10 includes an anterior eye observation optical system 20, a rotating slit 50, a photographing optical system 70, an optical element M1, and an objective lens 11.

[0054] The objective lens 11 is disposed on a combined optical path of the optical path (observation optical axis, observation optical path) of the anterior eye observation optical system 20 and the optical path (imaging optical axis, imaging optical path) of the photographing optical system 70 so as to face the subject's eye E. Here, the observation optical axis corresponds to the optical axis on which the image sensor in the anterior eye observation optical system 20 is disposed. Moreover, the imaging optical axis corresponds to the optical axis on which the image sensor 60 in the photographing optical system 70 is disposed (or the optical axis along the optical path of the illumination light).

[0055] The optical element M1 couples the optical path of the anterior eye observation optical system 20 with the optical paths of other optical systems (the photographing optical system 70, the rotating slit 50), and separates the optical path of the return light from the subject's eye E into the optical path of the anterior eye observation optical system 20 and the optical paths of the other optical systems. It is desirable for the optical element M1 to couple these optical systems so that the optical axis of the anterior eye observation optical system 20 is approximately coaxial with the optical axis of the other optical systems.

[0056] For example, the optical element M1 is a beam splitter (polarizing beam splitter, half mirror), a dichroic mirror, or a dichroic beam splitter.

[0057] The objective lens 11 is disposed between the eye E and the optical element M1. That is, the optical system 10 includes an objective lens common to each optical system. In the optical system 10, the objective lens 11 may be omitted.

[0058] (Anterior segment observation optical system 20) The anterior-segment observation optical system 20 is used to observe the anterior segment of the subject's eye E illuminated by illumination light. The anterior-segment observation optical system 20 includes an illumination optical system for observing the anterior segment.

[0059] The anterior eye observation optical system 20 includes at least one of an eyepiece and an image sensor. The eyepiece is used for naked eye observation of the subject's eye E. The image sensor is used to obtain a front image of the anterior eye of the subject's eye E. The image obtained using the image sensor is displayed on a display device of the display unit 120 by the control unit 100 controlling the display unit 120 upon receiving a detection signal from the image sensor.

[0060] For example, illumination light from an anterior-segment illumination light source (not shown) passes through the optical element M1 and is guided to the anterior segment via the objective lens 11. In some embodiments, illumination light from an anterior-segment illumination light source (not shown) directly illuminates the anterior segment of the subject's eye E.

[0061] The return light (reflected light) of the illumination light from the subject's eye E passes through the objective lens 11, passes through the optical element M1, and is guided to the anterior eye observation optical system 20.

[0062] (Photographic optical system 70) The photographing optical system 70 is used to photograph the fundus Ef of the subject's eye E illuminated by illumination light. The photographing optical system 70 includes an illumination optical system 30, a pupil splitting rotating mirror 40, and an image sensor 60.

[0063] An illumination system in the photographing optical system 70 (optical system 10) includes an illumination optical system 30 and a rotating slit 50. A light receiving system in the photographing optical system 70 (optical system 10) includes an image sensor 60. A pupil splitting rotating mirror 40 combines the optical path of the illumination system with the optical path of the light receiving system.

[0064] (Pupil division rotating mirror 40) The pupil division rotating mirror 40 is disposed on the photographing optical axis, and a hole is formed so as to perform pupil division of the illumination light and the return light at the pupil (pupil) of the subject's eye E, and connects the optical path of the illumination light from the illumination optical system 30 and the optical path of the return light of the illumination light from the subject's eye E. The pupil division rotating mirror 40 is configured to be rotatable around the photographing optical axis while being obliquely disposed with respect to the photographing optical axis, and the hole is formed at a position eccentric from the center of rotation. That is, the pupil division rotating mirror 40 is configured to be rotatable around the photographing optical axis with an axis intersecting the photographing optical axis as the rotation axis. The hole of the pupil division rotating mirror 40 can be disposed at a position optically approximately conjugate with the pupil (iris) of the subject's eye E. The pupil division rotating mirror 40 can be moved in the direction of the photographing optical axis by a moving mechanism (moving mechanism 10D or moving mechanism 70D) that moves the entire optical system, or by a moving mechanism not shown.

[0065] For example, the illumination optical system 30 (illumination system) is disposed in the reflecting direction of the pupil division rotating mirror 40, and the image sensor 60 (light receiving system) is disposed in the passing direction of the pupil division rotating mirror 40. In this case, the pupil division rotating mirror 40 is disposed on the imaging optical axis so that the illumination light from the illumination optical system 30 is reflected toward the subject's eye E by a mirror formed on the periphery of the hole, and the return light of the illumination light from the subject's eye E passes through the hole and is guided to the image sensor 60.

[0066] For example, the illumination optical system 30 (illumination system) is disposed in the passing direction of the pupil division rotating mirror 40, and the image sensor 60 (light receiving system) is disposed in the reflecting direction of the pupil division rotating mirror 40. In this case, the pupil division rotating mirror 40 is disposed on the imaging optical axis so that the illumination light from the illumination optical system 30 passes through the hole and the return light of the illumination light from the subject's eye E is reflected toward the image sensor 60 by a mirror formed on the periphery of the hole.

[0067] Such a pupil-splitting rotating mirror 40 functions as an aperture stop.

[0068] The pupil division rotating mirror 40 is not limited to being disposed at an angle with respect to the photographing optical axis as shown in Fig. 1. For example, the function of the pupil division rotating mirror 40 may be realized by a pupil division member and a mirror.

[0069] (Illumination optical system 30) The illumination optical system 30 illuminates the anterior segment or fundus Ef of the subject's eye E. The illumination optical system 30 includes an illumination light source, a lens, and the like.

[0070] For example, the illumination light generated by the illumination optical system 30 is reflected at the peripheral portion of the hole in the pupil splitting rotating mirror 40, passes through a slit formed in the rotating slit 50, is reflected by the optical element M1, passes through the objective lens 11, and is guided to the test eye E.

[0071] For example, the return light (reflected light) of the illumination light from the test eye E passes through the objective lens 11, is reflected by the optical element M1, passes through a slit formed in the rotating slit 50, passes through a hole in the pupil division rotating mirror 40, and is guided to the image sensor 60.

[0072] (Image Sensor 60) The image sensor 60 is a two-dimensional sensor (area sensor) in which light receiving elements are arranged two-dimensionally. Such an image sensor 60 is realized by a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor.

[0073] The light receiving surface of the image sensor 60 for receiving the returning light can be arranged at a position that is approximately optically conjugate with the fundus Ef (center of photography) of the subject's eye E. In some embodiments, the light receiving surface of the image sensor 60 can be arranged at a position that is approximately optically conjugate with a position between the center and one or more peripheral parts of the fundus Ef (for example, a position between the center of photography and the outermost position of the photography range).

[0074] In some embodiments, image sensor 60 is configured to simultaneously receive return light of illumination light from a central area obtained by a central area scan described below, and return light of illumination light from one or more peripheral areas obtained by a peripheral area scan described below.

[0075] In some embodiments, the image sensor 60 is configured to independently receive, in a time-division manner, return light of illumination light from the central area obtained by a central area scan described below, and return light of illumination light from the peripheral area obtained by a peripheral area scan described below.

[0076] In some embodiments, the image sensor 60 is controlled by the control unit 100 and is capable of setting an aperture range on the light receiving surface corresponding to the illumination area of ​​the illumination light on the fundus Ef. The aperture range is a range including the irradiation range of the return light on the light receiving surface corresponding to the illumination area of ​​the illumination light on the fundus Ef. This makes it possible to improve the image quality of the fundus Ef without being affected by unnecessary light received in a range other than the aperture range.

[0077] (Rotary slit 50) The rotating slit 50 is formed with a slit for scanning the central area and one or more slits for scanning the peripheral areas. The slit for scanning the central area is used to irradiate the central area including the imaging center of the fundus Ef with illumination light. The slits for scanning the one or more peripheral areas are used to irradiate each of one or more peripheral areas outside the central area of ​​the fundus Ef with illumination light.

[0078] The rotating slit 50 is configured to be rotatable around a predetermined rotation axis that is approximately parallel to the photographing optical axis. Hereinafter, the rotating slit 50 is assumed to be configured to be rotatable around the photographing optical axis. In other words, the rotating slit 50 is configured so that two or more slits can rotate around the photographing optical axis.

[0079] The slit for scanning the central part formed in the rotating slit 50 can be arranged at a position that is optically approximately conjugate with the central part including the imaging center of the fundus Ef. Each of the one or more slits for scanning the peripheral part formed in the rotating slit 50 can be arranged at a position that is optically approximately conjugate with one or more peripheral parts (representative positions of the peripheral parts) outside the central part including the imaging center of the fundus Ef. For example, the representative position of the peripheral part is the position closest to the imaging center on the boundary of the peripheral part, and the position farthest from the imaging center on the boundary of the peripheral part. In addition, the representative position of the peripheral part may be the center position or the center of gravity position between the position where the straight line passing through the imaging center intersects with the boundary of the peripheral part on the imaging center side and the position where the straight line passes through the imaging center intersects with the boundary of the peripheral part on the outer side.

[0080] When the illumination optical system 30 is disposed in the reflecting direction of the pupil division rotating mirror 40 and the image sensor 60 is disposed in the passing direction of the pupil division rotating mirror 40, the rotating slit 50 is rotated so that the illumination light from the illumination optical system 30 reflected by a mirror formed in the peripheral portion of the hole of the pupil division rotating mirror 40 passes through a slit for central scanning or a slit for peripheral scanning. In other words, the rotating slit 50 is rotated so that the return light of the illumination light irradiated to the subject's eye E passes through a slit for central scanning or a slit for peripheral scanning, and passes through the hole formed in the pupil division rotating mirror 40 to be guided to the image sensor 60.

[0081] When the illumination optical system 30 is disposed in the passing direction of the pupil division rotating mirror 40 and the image sensor 60 is disposed in the reflecting direction of the pupil division rotating mirror 40, the rotating slit 50 is rotated so that the illumination light from the illumination optical system 30 passes through a hole formed in the pupil division rotating mirror 40 and passes through a slit for central scanning or a slit for peripheral scanning. In other words, the rotating slit 50 is rotated so that the return light of the illumination light irradiated to the subject's eye E passes through a slit for central scanning or a slit for peripheral scanning, is reflected by a mirror formed on the periphery of the hole of the pupil division rotating mirror 40, and is guided to the image sensor 60.

[0082] In some embodiments, the rotating slit 50 includes two or more rotating slits. In this case, the rotating slit 50 includes a central rotating slit for scanning the central area and one or more peripheral rotating slits for scanning the peripheral areas for each of the one or more peripheral areas. The slit formed in the central rotating slit can be positioned at a position that is approximately optically conjugate with the central area of ​​the fundus Ef. The slit formed in each of the one or more peripheral rotating slits can be positioned at a position that is approximately optically conjugate with each of the one or more peripheral areas of the fundus Ef.

[0083] (Control unit 100) The control unit 100 controls the optical system 10 , the moving mechanisms 10 D, 50 D, and 70 D, the rotating mechanisms 40 R and 50 R, the data processing unit 200 , the operation unit 110 , the display unit 120 , and the anterior eye observation optical system 20 .

[0084] The control unit 100 includes a control unit (controller) 101 and a storage unit 102. The functions of the control unit 101 are realized by a processor. The storage unit 102 stores in advance a computer program for controlling the ophthalmic apparatus 1. The computer programs include a program for controlling the light source, a program for controlling the rotation of the pupil division rotating mirror 40, a program for controlling the rotation of the rotating slit 50, a program for controlling the image sensor 60, a program for controlling the anterior eye observation optical system 20, a program for controlling the moving mechanisms 10D, 50D, and 70D, a data processing program, and a user interface program. The control unit 100 executes control processing by the control unit 101 operating in accordance with such computer programs.

[0085] The control of the optical system 10 includes control of the illumination optical system 30 and control of the image sensor 60. The control of the illumination optical system 30 includes switching the light source on and off and controlling the amount of light. The control of the image sensor 60 includes control of the aperture range, exposure adjustment of the light receiving element, gain adjustment of the light receiving element, light receiving rate adjustment, etc.

[0086] The control of the moving mechanism 10D includes the movement control of the optical system 10. The control of the moving mechanism 50D includes the movement control of the rotating slit 50. The control of the moving mechanism 70D includes the movement control of the photographing optical system 70.

[0087] Control over the rotation mechanism 40R includes rotation control of the pupil division rotating mirror 40 (rotation speed control, rotation control within a desired rotation angle range, rotation to a desired rotation start angle, and stopping rotation at a desired rotation end angle). Control over the rotation mechanism 50R includes rotation control of the rotating slit 50 (a central rotating slit or a peripheral rotating slit described below) (rotation speed control, rotation control within a desired rotation angle range, rotation to a desired rotation start angle, and stopping rotation at a desired rotation end angle). The rotation mechanisms 40R and 50R are controlled so that the rotation of the pupil division rotating mirror 40 and the rotation of the rotating slit 50 are synchronized.

[0088] The control over the data processing unit 200 includes control over the execution of each process in the data processing unit 200, which will be described later.

[0089] The control over the operation unit 110 includes, for example, reception control of operation contents for the operation unit 110. The control over the display unit 120 includes, for example, display control using the display unit.

[0090] The storage unit 102 stores various types of data. The data stored in the storage unit 102 includes an image of the fundus Ef acquired using the image sensor 60, information about the subject's eye, etc. The information about the subject's eye includes information about the subject, such as a patient ID and name, identification information about the left eye / right eye, electronic medical record information, etc.

[0091] (Data Processing Unit 200) The data processing unit 200 forms an image of the fundus oculi Ef based on the result of receiving the return light of the illumination light acquired by the image sensor 60 .

[0092] For example, the data processing unit 200 forms a front image of the center of the fundus Ef based on the result of receiving the return light of the illumination light acquired by the image sensor 60 by performing a central scan, and forms a front image of one or more peripheral parts of the fundus Ef based on the result of receiving the return light of the illumination light acquired by the image sensor 60 by performing one or more peripheral scans. The data processing unit 200 can obtain a composite image by combining the formed front image of the center and the front image of one or more peripheral parts.

[0093] For example, the data processing unit 200 forms a front image of the fundus Ef including a central area and one or more peripheral areas based on the reception results of the return light of the illumination light acquired by the image sensor 60 by simultaneously performing a central scan and a peripheral scan.

[0094] Moreover, the data processing unit 200 is controlled by the control unit 100 and can perform various data processing (image processing) and analysis processing on the light reception results obtained using the optical system 10. For example, the data processing unit 200 executes correction processing such as image brightness correction and dispersion correction. In some embodiments, the data processing unit 200 executes data processing such as image analysis, image evaluation, and diagnostic support.

[0095] The functions of the data processing unit 200 are realized by a processor that operates according to a data processing program.

[0096] The moving mechanism 10D moves the optical system 10 three-dimensionally (in the X-, Y-, and Z-directions). This allows the optical system 10 to be moved relative to the subject's eye E. For example, the moving mechanism 10D is provided with a holding member for holding the optical system 10, an actuator for generating a driving force for moving the holding member, and a transmission mechanism for transmitting the driving force. The actuator is, for example, a pulse motor. The transmission mechanism is, for example, a combination of gears or a rack-and-pinion. The control unit 100 can control the moving mechanism 10D to move the optical system 10 three-dimensionally. For example, this control is used in alignment and tracking. Alignment is the alignment of the subject's eye E and the optical system 10 so that a desired part of the fundus Ef is the center of the image. When performing alignment, the optical system 10 is moved so that the positional relationship of the optical system 10 with respect to the subject's eye E has a predetermined relationship based on an image obtained by photographing the subject's eye E using the anterior eye observation optical system 20. Tracking refers to moving the optical system 10 in accordance with the movement of the subject's eye E. When tracking is performed, alignment and focusing are performed in advance. Tracking is a function that maintains a suitable positional relationship where alignment and focus are achieved by moving the optical system 10 in real time in accordance with the position and orientation of the subject's eye E based on an image obtained by capturing a moving image of the subject's eye E using the anterior eye observation optical system 20.

[0097] In some embodiments, the optical system 10 includes at least one of an alignment system for aligning the optical system 10 with respect to the subject's eye E and a focus system for focusing the optical system 10 with respect to the subject's eye E.

[0098] The moving mechanism 50D moves the rotating slit 50 in the direction of the photographing optical axis at the fundus Ef. As described above, the rotating slit 50 includes a central rotating slit for scanning the central area and one or more peripheral rotating slits for scanning one or more peripheral areas. The moving mechanism 50D includes one or more moving mechanisms, which move each of the central rotating slit and one or more peripheral rotating slits, excluding a predetermined rotating slit, in the direction of the photographing optical axis. In this case, the predetermined rotating slit is moved to a position that is approximately optically conjugate with a predetermined portion of the subject's eye E by moving the optical system 10 or the photographing optical system 70.

[0099] In some embodiments, the one or more moving mechanisms move each of the central rotating slit and one or more peripheral rotating slits, excluding a predetermined rotating slit, in the direction of the imaging optical axis based on the refractive power of the subject's eye E. Since the shape (curvature) of the fundus Ef can be estimated based on the refractive power of the subject's eye E, it becomes possible to position the slits formed in each rotating slit at a position that is approximately optically conjugate with the area to be scanned using the illumination light according to the estimated shape of the fundus Ef.

[0100] In some embodiments, the one or more moving mechanisms move each of the central rotating slit and one or more peripheral rotating slits, excluding a predetermined rotating slit, in the direction of the imaging optical axis based on OCT data obtained by performing optical coherence tomography (hereinafter, OCT) on the fundus Ef of the subject's eye E. Since the shape of the fundus Ef can be specified with high accuracy based on the OCT data of the subject's eye E, it becomes possible to position the slits formed in each rotating slit at a position that is approximately optically conjugate with the area to be scanned using the illumination light according to the specified shape of the fundus Ef.

[0101] For example, each of the one or more moving mechanisms included in the moving mechanism 50D is provided with a holding member that holds the rotating slit to be moved, an actuator that generates a driving force for moving the holding member, and a transmission mechanism that transmits the driving force, similar to the moving mechanism 10D. The control unit 100 can control the moving mechanism 50D (each of the one or more moving mechanisms) to move each of the one or more rotating slits other than a predetermined rotating slit among the central rotating slit and the one or more peripheral rotating slits in the direction of the imaging optical axis.

[0102] The moving mechanism 70D moves the photographing optical system 70 in the direction of the photographing optical axis. This makes it possible to move the photographing optical system 70 in the Z direction relative to the subject's eye E. For example, like the moving mechanism 10D, the moving mechanism 70D is provided with a holding member that holds the photographing optical system 70, an actuator that generates a driving force for moving the holding member, and a transmission mechanism that transmits the driving force. The control unit 100 controls the moving mechanism 70D to move the photographing optical system 70 in the Z direction.

[0103] The rotation mechanism 40R rotates the pupil division rotating mirror 40 around a predetermined rotation axis (e.g., the imaging optical axis). For example, the rotation mechanism 40R is provided with a holding member that holds the pupil division rotating mirror 40, an actuator that generates a driving force for rotating the holding member, and a transmission mechanism that transmits the driving force. The control unit 100 can control the rotation mechanism 40R to rotate the pupil division rotating mirror 40. In some embodiments, the rotation mechanism 40R is provided with a rotary encoder, and the amount of rotational displacement of the pupil division rotating mirror 40 can be detected. The control unit 100 can control the rotation angle and rotation speed of the pupil division rotating mirror 40 based on the amount of displacement detected by the rotary encoder.

[0104] The rotation mechanism 50R rotates either the central rotation slit 51 or one or more peripheral rotation slits 52 around a predetermined rotation axis (for example, the imaging optical axis). For example, the rotation mechanism 50R is provided with a holding member that holds either the central rotation slit 51 or one or more peripheral rotation slits 52, an actuator that generates a driving force for rotating the holding member, and a transmission mechanism that transmits the driving force. The control unit 100 can control the rotation mechanism 50R to rotate either the central rotation slit 51 or one or more peripheral rotation slits 52. In some embodiments, the rotation mechanism 50R is provided with a rotary encoder, and the amount of rotational displacement of either the central rotation slit 51 or one or more peripheral rotation slits 52 can be detected. The control unit 100 can control the rotation angle and rotation control of either the central rotation slit 51 or one or more peripheral rotation slits 52 based on the amount of displacement detected by the rotary encoder.

[0105] (Operation unit 110) The operation unit 110 is used by a user to input instructions to the ophthalmologic apparatus 1. The operation unit 110 may include a known operation device used in a computer. For example, the operation unit 110 may include a pointing device such as a mouse, a touchpad, or a trackball. The operation unit 110 may also include a keyboard, a pen tablet, a dedicated operation panel, or the like.

[0106] (Display unit 120) The display unit 120 includes a display section (display device) such as a liquid crystal display, and displays various information such as images under the control of the control unit 100. The display unit 120 and the operation unit 110 do not need to be configured as separate units. For example, it is possible to use a device in which the display function and the operation function are integrated, such as a touch panel.

[0107] Here, a configuration example of the optical system 10 of the ophthalmic apparatus 1 according to the first embodiment will be specifically described.

[0108] [Optical system configuration] For ease of explanation, the following describes a case where a central scan is performed on the fundus Ef, in which the central area including the imaging center of the fundus Ef is scanned with illumination light, and a single peripheral scan is performed on a single peripheral area outside the central area of ​​the fundus Ef with illumination light. However, the configuration according to the embodiment is not limited to the configuration described below. The configuration according to the embodiment is applicable to a configuration that performs two or more peripheral scans.

[0109] 2, 3, 4A, and 4B show configuration examples of the optical system 10 in FIG. 1. FIG. 2 shows a specific configuration example of the optical system 10 in FIG. 1. FIG. 3 shows a specific configuration example of the pupil division rotating mirror 40 in FIG. 2 as viewed from the direction of the imaging optical axis O. FIG. 4A shows a specific configuration example of the central rotating slit 51 for scanning the central part in FIG. 2 as viewed from the direction of the imaging optical axis O. FIG. 4B shows a specific configuration example of the peripheral rotating slit 52 for scanning the peripheral part in FIG. 2 as viewed from the direction of the imaging optical axis O. In FIGS. 2 to 4B, the same reference numerals are used for the same parts as in FIG. 1, and the description will be omitted as appropriate.

[0110] 2 does not show the anterior-eye observation optical system 20. For example, an optical element M1 that couples the optical path of the anterior-eye observation optical system 20 and the optical path of the photographing optical system 70 is disposed between the lens (focusing lens) 12 and the pupil-splitting rotating mirror 40.

[0111] The illumination optical system 30 includes a light source 30 A and a condenser lens 30 B. Illumination light output from the light source 30 A passes through the condenser lens 30 B and is reflected toward the subject's eye E by the pupil division rotating mirror 40.

[0112] 3, pupil division rotating mirror 40 has hole 40a formed at a position eccentric from imaging optical axis O, and is configured so that hole 40a can rotate around imaging optical axis O. Hole 40a is formed, for example, so that the shapes of the inner diameter side and the outer diameter side each form a part of an arc centered around imaging optical axis O. Illumination light that has passed through condenser lens 30B is reflected toward lens 12 by a mirror formed in pupil division rotating mirror 40 on the periphery of hole 40a.

[0113] The lens 12 is disposed between the pupil division rotating mirror 40 and the rotating slit 50. In some embodiments, the lens 12 is a focusing lens that is movable in the direction of the photographing optical axis. In this case, the control unit 100 can move the lens 12 in the direction of the photographing optical axis by controlling a moving mechanism (not shown). The illumination light reflected by the pupil division rotating mirror 40 passes through the lens 12 and is guided to the rotating slit 50.

[0114] 2, the rotating slit 50 includes a central rotating slit 51 and a peripheral rotating slit 52. The central rotating slit 51 and the peripheral rotating slit 52 can be selectively positioned on the optical path between the pupil division rotating mirror 40 and the eye E to be examined (the optical path joined by the pupil division rotating mirror 40). That is, two or more rotating slits included in the rotating slit 50 are selectively positioned on the optical path. In this case, the above-mentioned moving mechanism 50D selectively positions the central rotating slit 51 and the peripheral rotating slit 52 on the optical path between the pupil division rotating mirror 40 and the eye E to be examined.

[0115] As shown in Fig. 4A, the central rotation slit 51 has a slit 51a formed in a central region through which the photographing optical axis O passes. The central rotation slit 51 is rotated such that the slit 51a rotates around the photographing optical axis O as a rotation axis. The photographing optical axis O is disposed so as to pass through the slit 51a. The slit 51a formed in the central rotation slit 51 is disposed at a position that is approximately optically conjugate with the central portion including the photographing center of the fundus Ef by moving the optical system 10 using the moving mechanism 10D.

[0116] 4B, the peripheral rotation slit 52 has a slit 52a formed in a peripheral region outside a central region through which the photographing optical axis O passes. The peripheral rotation slit 52 is rotated with the photographing optical axis O as a rotation axis such that the slit 52a rotates around the photographing optical axis O. The slit 52a formed in the peripheral rotation slit 52 is moved in the photographing optical axis direction by the moving mechanism 50D, so that it is positioned at a position that is approximately optically conjugate with the peripheral region outside the central portion including the photographing center of the fundus Ef.

[0117] When performing a peripheral scan for each of two or more peripheral parts of the fundus Ef, the rotating slit 50 includes two or more peripheral rotating slits corresponding to the two or more peripheral parts. In each peripheral rotating slit, a slit is formed at a position corresponding to a target area for the peripheral scan. Each moving mechanism including the moving mechanism 50D moves the corresponding peripheral rotating slit in the direction of the imaging optical axis to position the corresponding peripheral rotating slit at a position approximately optically conjugate with the target area for the peripheral scan on the fundus Ef.

[0118] As shown in FIG. 4A and FIG. 4B, the slit formed in the rotating slit is formed so as to become wider as it gets farther from the photographing optical axis (rotation axis) (the length of the arc centered on the rotation axis passing through the slit becomes longer). In some embodiments, the slit is formed to have a substantially trapezoidal shape or a triangular shape. Here, the substantially trapezoidal shape means not only a shape in which the upper and lower bases of the trapezoid are linear, but also a shape in which at least one of the upper and lower bases of the trapezoid is arc-shaped. This makes it possible to reduce the difference between the amount of return light of the illumination light irradiated to the center including the photographing center and the amount of return light of the illumination light irradiated to the peripheral portion outside the center. In addition, it becomes possible to correct the amount of illumination light, and it becomes possible to correct the light distribution of the light source (light amount distribution of the illumination light).

[0119] In some embodiments, the control unit 100 controls at least one of the illumination system and the light receiving system so as to reduce the difference between the amount of return light obtained by the central scan and the amount of return light obtained by one or more peripheral scans. For example, the control unit 100 can reduce the difference in the amount of light by controlling the amount of illumination light. For example, the control unit 100 can reduce the difference in the amount of light by controlling the exposure time of the image sensor 60.

[0120] In some embodiments, the control unit 100 controls the data processing unit 200 to perform brightness correction for each pixel of the central portion in the image obtained by the central portion scan, taking into consideration the balance between the amount of return light from the central portion obtained by the central portion scan and the amount of return light from the peripheral portion obtained by the peripheral portion scan. For example, the brightness of pixels in the area where multiple images are acquired by the central portion scan is averaged.

[0121] When performing a central scan, the central rotating slit 51 is placed on the imaging optical axis, and the peripheral rotating slit 52 is retracted from the imaging optical axis. The central rotating slit 51 rotates in synchronization with the rotation of the pupil division rotating mirror 40. In some embodiments, the rotation speed of the central rotating slit 51 is the same as the rotation speed of the pupil division rotating mirror 40. In some embodiments, the rotation speed of the central rotating slit 51 is an integer multiple of two or more of the rotation speed of the pupil division rotating mirror 40. In some embodiments, the rotation speed of the pupil division rotating mirror 40 is an integer multiple of two or more of the rotation speed of the central rotating slit 51.

[0122] The illumination light transmitted through the lens 12 as described above passes through the slit 51a formed in the central rotary slit 51, is refracted by the objective lens 11, enters the eye through the pupil of the subject's eye E, and irradiates the central part including the photographing center of the fundus Ef. The return light of the illumination light irradiated to the fundus Ef passes through the objective lens 11, passes through the slit 51a formed in the central rotary slit 51, passes through the lens 12, passes through the hole 40a formed in the pupil division rotary mirror 40, and is imaged on the light receiving surface of the image sensor 60 by the imaging lens 13.

[0123] When performing a peripheral scan, the peripheral rotating slit 52 is disposed on the imaging optical axis, and the central rotating slit 51 is retracted from the imaging optical axis. The peripheral rotating slit 52 rotates in synchronization with the rotation of the pupil division rotating mirror 40. In some embodiments, the rotation speed of the peripheral rotating slit 52 is the same as the rotation speed of the pupil division rotating mirror 40. In some embodiments, the rotation speed of the peripheral rotating slit 52 is an integer multiple of the rotation speed of the pupil division rotating mirror 40 that is two or more times greater. In some embodiments, the rotation speed of the pupil division rotating mirror 40 is an integer multiple of the rotation speed of the peripheral rotating slit 52 that is two or more times greater.

[0124] The illumination light transmitted through the lens 12 as described above passes through the slit 52a formed in the peripheral rotary slit 52, is refracted by the objective lens 11, enters the eye through the pupil of the subject's eye E, and irradiates the peripheral area outside the central area including the photographing center of the fundus Ef. The return light of the illumination light irradiated to the fundus Ef passes through the objective lens 11, passes through the slit 52a formed in the peripheral rotary slit 52, passes through the lens 12, passes through the hole 40a formed in the pupil division rotary mirror 40, and is imaged on the light receiving surface of the image sensor 60 by the imaging lens 13.

[0125] Here, the operation of the ophthalmologic apparatus 1 according to the first embodiment will be described in comparison with a comparative example of the embodiment.

[0126] 5 and 6 are diagrams illustrating the operation of an ophthalmologic apparatus according to a comparative example of the embodiment. Fig. 5 is a schematic diagram illustrating a general scan of the fundus oculi Ef. Fig. 6 is a schematic diagram illustrating the relationship between illumination light incident on the eyeball and a scan area on the fundus oculi Ef.

[0127] In the comparative example of the embodiment, illumination light is irradiated onto an illumination area IR0 that moves in a predetermined scanning direction DR relative to a predetermined scanning area including the imaging center Pc on the fundus Ef. In FIG. 5, a linear illumination area IR0 is moved in the scanning direction DR. Return light of the illumination light irradiated onto each illumination area is received by an image sensor. As a result, the entire scanning area including the imaging center Pc on the fundus Ef is scanned with the illumination light.

[0128] Therefore, when the focus of the illumination light is adjusted with respect to the photographing center Pc set at the site of interest on the fundus Ef, the focus position of the illumination light is shifted in the peripheral part of the fundus away from the photographing center Pc. As a result, an image in which blur occurs in the peripheral part away from the photographing center Pc is obtained. This is true not only when the subject's eye E has a substantially normal axial length, but also when the subject's eye E has a long axial length.

[0129] 7 and 8 are diagrams illustrating the operation of the ophthalmologic apparatus 1 according to the first embodiment. Fig. 7 is a schematic diagram illustrating a central scan and a peripheral scan of the fundus Ef. Fig. 8 is a schematic diagram illustrating the relationship between the illumination light incident on the eyeball and the scan area on the fundus Ef.

[0130] In the central scan CS, the illumination light is irradiated onto an illumination area IR1 that rotates around the imaging center Pc of the fundus Ef. For example, the illumination area IR1 includes the imaging center Pc. In FIG. 7, the slit-shaped illumination area IR1 is rotated around the imaging center Pc. The return light of the illumination light irradiated onto each illumination area is received by the image sensor 60 as described above. As a result, the central area including the imaging center Pc of the fundus Ef is scanned with the illumination light.

[0131] In the peripheral scan PS, illumination light is applied to an illumination area IR2 that rotates around the imaging center Pc of the fundus Ef. The imaging center Pc (and the central area) are not included in the illumination area IR2. In FIG. 7, a slit-shaped illumination area IR2 is rotated around the imaging center Pc. The return light of the illumination light applied to each illumination area is received by the image sensor 60 as described above. As a result, the peripheral area outside the central area including the imaging center Pc of the fundus Ef is scanned with the illumination light.

[0132] In some embodiments, the central scan CS and the peripheral scan PS are performed simultaneously. In some embodiments, the central scan CS and the peripheral scan PS are performed independently in a time-division multiplexed manner.

[0133] Therefore, when the subject's eye E has a substantially normal axial length and a substantially normal fundus shape (the diagram on the left side of FIG. 8), the central area including the imaging center Pc is scanned in focus by the central area scan CS with illumination light entering the eye through the pupil PL of the subject's eye E. The peripheral area outside the central area is also scanned in focus by the peripheral area scan PS with illumination light entering the eye through the pupil PL of the subject's eye E.

[0134] On the other hand, even if the axial length of the subject's eye E is long (the diagram on the right side of FIG. 8), the central area including the imaging center Pc is scanned in focus by the central area scan CS with illumination light entering the eye through the pupil PL of the subject's eye E. The peripheral area outside the central area is also scanned in focus by the peripheral area scan PS with illumination light entering the eye through the pupil PL of the subject's eye E.

[0135] Therefore, according to the embodiment, regardless of the fundus shape of the subject's eye E, it is possible to acquire an image in focus not only of the central part but also of the peripheral part of the fundus Ef.

[0136] The fundus Ef is an example of a "predetermined portion of the test eye" according to the embodiment. The illumination optical system 30 is an example of an "illumination system" according to the embodiment. The image sensor 60 is an example of a "light receiving system" according to the embodiment. The control unit 100 or the control unit 101 is an example of a "control unit" according to the embodiment. The data processing unit 200 is an example of an "image forming unit" according to the embodiment. The rotating slit 50 (the central rotating slit 51, and one or more peripheral rotating slits 52) is an example of "two or more slits" according to the embodiment. The central rotating slit 51 is an example of a "first slit" according to the embodiment. The peripheral rotating slit 52 is an example of a "second slit" according to the embodiment. The moving mechanism 50D is an example of "one or more moving mechanisms" according to the embodiment.

[0137] [Example] An example of the operation of the ophthalmologic apparatus 1 according to the first embodiment will be described.

[0138] 9A and 9B show an overview of an operation example of the ophthalmic apparatus 1 according to the first embodiment. FIG. 9A and 9B show a flow diagram of the operation example of the ophthalmic apparatus 1 according to the first embodiment. A computer program for realizing the processing shown in FIG. 9A and FIG. 9B is stored in the storage unit 102 of the control unit 100. The control unit 101 of the control unit 100 operates according to the computer program to execute the processing shown in FIG. 9A and FIG. 9B.

[0139] (S1: Accepts refractive power) First, the control unit 101 receives the refractive power of the eye E to be examined.

[0140] In some embodiments, the control unit 101 controls the display unit 120 to display information on the display unit that prompts the user to input the refraction of the subject's eye E. The user inputs the refraction of the subject's eye E by operating the operation unit 110. The control unit 101 accepts the refraction of the subject's eye E based on the operation content of the operation unit 110.

[0141] In some embodiments, the control unit 101 requests an external refractive power measurement device to transmit the refractive power of the test eye E, and accepts the refractive power of the test eye E by receiving the refractive power of the test eye E that has been pre-stored in the refractive power measurement device.

[0142] (S2: Determine the difference between the focus positions in the center and the periphery) Next, based on the refractive power of the test eye E accepted in step S1, the control unit 101 determines the difference between the focus position of the illumination light for the central portion of the fundus Ef, including the center of photography, and the focus position of the illumination light for the peripheral portion outside the central portion.

[0143] It is known that the refraction of the test eye is correlated with the shape of the fundus of the test eye. For example, in the case of myopia, the axial length of the test eye becomes longer, and the curvature of the fundus, which represents the shape of the fundus, becomes larger as the myopia progresses. Therefore, the difference between the position of the photographing center of the fundus in the photographing optical axis direction and the position of the peripheral part of the fundus in the photographing optical axis direction can be specified according to the refraction of the test eye. That is, the position on the optical axis of the central rotating slit 51, which should be located at a position optically approximately conjugate with the central part, and the position on the optical axis of the peripheral rotating slit 52, which should be located at a position optically approximately conjugate with the peripheral part, can be specified.

[0144] For example, the storage unit 102 stores in advance table information associating a difference in the position on the optical axis of the peripheral rotating slit 52 based on the position on the optical axis of the central rotating slit 51 with a plurality of refractive indices. The control unit 101 can refer to the table information stored in the storage unit 102 to identify the difference in the position on the optical axis associated with the refractive indices of the subject's eye E received in step S1.

[0145] In some embodiments, the position on the optical axis of the central rotating slit 51 to be disposed at a position substantially optically conjugate with the central portion and the position on the optical axis of the peripheral rotating slit 52 to be disposed at a position substantially optically conjugate with the peripheral portion are specified by analyzing the contrast of the repeatedly acquired fundus images. For example, the difference between the focus position of the illumination light for the central portion and the focus position of the illumination light for the peripheral portion is specified so that the difference in contrast between the central portion and the peripheral portion is minimized.

[0146] (S3: Move the peripheral rotating slit) Next, the control unit 101 controls the moving mechanism 50D based on the difference in focus position determined in step S2 to move the peripheral rotation slit 52 in the direction of the imaging optical axis. That is, the position of the peripheral rotation slit 52 in the direction of the imaging optical axis relative to the central rotation slit 51 is shifted.

[0147] In some embodiments, the control unit 101 controls the moving mechanism 50D to move the central rotation slit 51 to a predetermined reference position on the imaging optical axis, and also moves the peripheral rotation slit 52. The peripheral rotation slit 52 is moved so as to shift in the imaging optical axis direction by a distance d (see FIG. 2) corresponding to the difference in focus positions from the above-mentioned reference position.

[0148] (S4: Alignment) Next, the control unit 101 controls the moving mechanism 10D and the like to move the optical system 10 to an initial position. Thereafter, the control unit 101 controls execution of alignment for aligning the optical system 10 with respect to the subject's eye E. For example, in step S4, the light receiving surface of the image sensor 60 is disposed at a position approximately optically conjugate with the fundus Ef, and the hole 40a formed in the pupil division rotating mirror 40 is disposed at a position approximately optically conjugate with the pupil of the subject's eye E.

[0149] For example, the control unit 101 causes the display unit 120 to display an anterior eye image of the subject's eye E acquired using the anterior eye observation optical system 20. The control unit 101 can control the moving mechanism 10D to move the optical system 10 in a direction specified by a user using the operation unit 110.

[0150] In some embodiments, the control unit 101 aligns the optical system 10 with the test eye E by projecting light from an alignment light source included in an alignment system (not shown) onto the test eye E and controlling the moving mechanism 10D based on an image corresponding to the returned light.

[0151] In some embodiments, the control unit 101 causes two or more cameras (not shown) to capture images of the anterior part of the subject's eye E from different directions, and specifies the position of the subject's eye E from the two or more images with parallax. The control unit 101 controls the moving mechanism 10D based on the specified position of the subject's eye E, thereby aligning the optical system 10 with the subject's eye E.

[0152] (S5: A central rotating slit is placed in the optical path) Next, the control unit 101 controls the moving mechanism 50D to place the central rotary slit 51 in the photographing optical path (photographing optical axis). The peripheral rotary slit 52 is retracted from the photographing optical path.

[0153] (S6: Adjust the slit position) Next, the control unit 101 controls the rotation mechanisms 40R and 50R to rotate the pupil splitting rotating mirror 40 and the central rotating slit 51 to predetermined rotation start positions.

[0154] (S7: Focus adjustment) Next, the control unit 101 controls the moving mechanism 70D or the moving mechanism that moves the lens 12 to adjust the focus position of the illumination light.

[0155] For example, the control unit 101 identifies the focus state (degree of blur) of the fundus image obtained by the photographing optical system 70, and adjusts the focus position of the illumination light by controlling the moving mechanism 70D or the moving mechanism that moves the lens 12 so that the identified focus state becomes the desired focus state.

[0156] As a result, the slit 51a formed in the central rotation slit 51 is positioned at a position that is optically conjugate with the central portion including the imaging center of the fundus Ef. When the peripheral rotation slit 52 is positioned at a shift position corresponding to the difference in the focus position based on this position, the slit 52a formed in the peripheral rotation slit 52 is positioned at a position that is optically conjugate with the peripheral portion outside the central portion including the imaging center of the fundus Ef.

[0157] (S8: Turn on the fundus illumination light source) Next, the control unit 101 controls the light source 30A of the illumination optical system 30 to turn on the light source for fundus scanning.

[0158] (S9: Exposure start) Next, the control unit 101 controls the image sensor 60 to start exposure to the return light of the illumination light from the fundus Ef.

[0159] (S10: Rotating the pupil splitting rotating mirror and the central rotating slit) Next, the control unit 101 controls the rotation mechanisms 40R, 50R to start rotating the pupil division rotating mirror 40 and the central portion rotating slit 51. The control unit 101 controls the rotation mechanisms 40R, 50R so that the pupil division rotating mirror 40 and the central portion rotating slit 51 start rotating at the same time and at the same rotation speed.

[0160] In this way, a central portion scan is executed. In the central portion scan, the image sensor 60 receives the return light of the illumination light irradiated onto each illumination range.

[0161] (S11:Next?) The control unit 101 determines whether or not to execute a peripheral scan following the central scan.

[0162] When it is determined that a peripheral scan is to be performed following the central scan (S11: Y), the operation of the ophthalmic apparatus 1 proceeds to step S12. When it is determined that a peripheral scan is not to be performed following the central scan (S11: N), the operation of the ophthalmic apparatus 1 proceeds to step S15.

[0163] (S12: Peripheral slits are placed in the optical path) When it is determined in step S11 that the peripheral scan is to be executed following the central scan (S11: Y), the control unit 101 controls the moving mechanism 50D to place the peripheral rotating slit 52 in the imaging optical path (imaging optical axis). The central rotating slit 51 is retracted from the imaging optical path.

[0164] (S13: Adjust the slit position) Next, the control unit 101 controls the rotation mechanisms 40R and 50R to rotate the pupil splitting rotating mirror 40 and the central rotating slit 51 to predetermined rotation start positions.

[0165] (S14: Rotate the pupil division rotating mirror and the central rotating slit) Next, the control unit 101 controls the rotation mechanisms 40R, 50R to start rotating the pupil division rotating mirror 40 and the peripheral rotating slit 52. The control unit 101 controls the rotation mechanisms 40R, 50R so that the pupil division rotating mirror 40 and the peripheral rotating slit 52 start rotating at the same time and rotate at the same rotation speed.

[0166] In this way, peripheral scanning is performed. In peripheral scanning, the image sensor 60 also receives return light of the illumination light irradiated onto each illumination range.

[0167] (S15: Exposure ends) Following step S14, or when it is determined in step S11 that a peripheral scan will not be performed following a central scan (S11:N), the control unit 101 controls the image sensor 60 to terminate exposure to the return light of the illumination light from the fundus Ef.

[0168] (S16:Display) The control unit 101 causes a display unit included in the display unit 120 to display an image of the fundus Ef based on the light reception results obtained by the image sensor 60 from the central scan in step S10 and the light reception results obtained by the image sensor 60 from the peripheral scan in step S14.

[0169] In some embodiments, the control unit 101 controls the data processing unit 200 to acquire an image of the central part of the fundus Ef based on the light reception results obtained by the image sensor 60 in the central part scan in step S10. The control unit 101 also controls the data processing unit 200 to acquire an image of the peripheral part of the fundus Ef based on the light reception results obtained by the image sensor 60 in the peripheral part scan in step S14. The control unit 101 controls the data processing unit 200 to form a composite image by combining the acquired image of the central part and the image of the peripheral part.

[0170] This is the end of the operation of the ophthalmologic apparatus 1 (END).

[0171] Fig. 10 is an explanatory diagram of the operation of the ophthalmic apparatus 1 according to the first embodiment. Fig. 10 shows a schematic diagram of an image IMG0 of the fundus Ef acquired by an ophthalmic apparatus according to a comparative example of the first embodiment, and an image IMG1 of the fundus Ef acquired by the ophthalmic apparatus 1 according to the first embodiment.

[0172] In an ophthalmic device relating to a comparative example of the first embodiment, the focus position of the illumination light cannot be set at the center and periphery of the fundus Ef, so an image IMG0 of the fundus Ef is acquired in which the center is clear and the periphery is blurred.

[0173] In contrast, according to the ophthalmologic device 1 of the first embodiment, the focus position of the illumination light can be set at both the central and peripheral parts of the fundus Ef, so that a high-quality image IMG1 of the fundus Ef with clear central and peripheral parts is obtained.

[0174] As described above, according to the first embodiment, an image of the fundus Ef is acquired by a central scan in which illumination light is irradiated onto an illumination area that rotates around the imaging center in the central area including the imaging center, and a peripheral scan in which illumination light is irradiated onto an illumination area that rotates around the imaging center in the peripheral area outside the central area. This makes it possible to acquire an image of the fundus Ef with illumination light that allows the focus position to be set at each of the central area and the peripheral area. As a result, it becomes possible to easily acquire a high-quality image of the subject's eye even when the angle of view is large.

[0175] In addition, the fundus Ef is scanned (central scan, peripheral scan) with illumination light so that the illumination range rotates around the photographing center of the fundus Ef of the subject's eye E, thereby weakening the intensity of the reflected component from the center of the objective lens 11 and eliminating artifacts caused by the reflected component. Therefore, even if the angle of view is large, it becomes possible to easily obtain a high-quality image of the subject's eye E.

[0176] <Second embodiment> In the first embodiment, a central rotating slit 51 and a peripheral rotating slit 52 are selectively arranged in the optical path, and central scanning and peripheral scanning are performed in a time-division manner. However, the configuration of the embodiment is not limited to this.

[0177] For example, by splitting the optical path (imaging optical path) combined by the pupil splitting rotating mirror 40 into two or more optical paths and arranging a central rotating slit and one or more peripheral rotating slits in each of the two or more split optical paths, it becomes possible to perform a central scan and one or more peripheral scans simultaneously.

[0178] Hereinafter, the ophthalmologic apparatus according to the second embodiment will be described, focusing on the differences from the first embodiment.

[0179] Fig. 11 shows an example of the configuration of an optical system of an ophthalmic apparatus according to the second embodiment. In Fig. 11, the same parts as those in Fig. 2 are given the same reference numerals, and the description thereof will be omitted as appropriate.

[0180] The configuration of the optical system of the ophthalmic apparatus of the second embodiment differs from the configuration of the optical system 10 of the ophthalmic apparatus 1 of the first embodiment in the configuration of the optical system arranged between the imaging optical system 70 and the objective lens 11.

[0181] Specifically, beam splitters 71 and 74, reflecting mirrors 72 and 76, lenses 73 and 75, a central rotary slit 51, and a peripheral rotary slit 52 are provided between the photographing optical system 70 and the objective lens 11. At least one of the beam splitters 71 and 74 may be a half mirror.

[0182] A beam splitter 71 is disposed in the photographing optical path (the optical path of the illumination light and the optical path of the return light) joined by the pupil splitting rotating mirror 40. The beam splitter 71 splits the photographing optical path into a first photographing optical path for scanning the central area and a second photographing optical path for scanning the peripheral area. A central rotating slit 51, a reflecting mirror 72, and a lens 73 are disposed in the first photographing optical path. A peripheral rotating slit 52, a reflecting mirror 76, and a lens 75 are disposed in the second photographing optical path. The first photographing optical path and the second photographing optical path are joined by a beam splitter 74 and are guided to the objective lens 11.

[0183] The control of the ophthalmologic apparatus according to the second embodiment is similar to that of the first embodiment. However, according to the second embodiment, the fundus Ef can be scanned while the central rotary slit 51 and the peripheral rotary slit 52 are placed on the optical path, so that steps S10 and S14 in FIG. 9B can be performed simultaneously.

[0184] The beam splitter 71 is an example of an "optical path splitting member" according to the embodiment. The rotary slit 50 is an example of "two or more slits" according to the embodiment. The beam splitter 74 is an example of an "optical path combining member" according to the embodiment. The central rotary slit 51 is an example of a "first slit" according to the embodiment. The peripheral rotary slit 52 is an example of a "second slit" according to the embodiment.

[0185] As described above, according to the second embodiment, like the first embodiment, an image of the fundus Ef can be acquired with illumination light that can set the focus position at the center and the periphery. As a result, even if the angle of view is large, a high-quality image of the subject's eye can be easily acquired. In addition, since the central scan and the peripheral scan can be performed simultaneously, a high-quality image of the subject's eye can be more easily acquired.

[0186] In addition, the fundus Ef is scanned (central scan, peripheral scan) with illumination light so that the illumination range rotates around the photographing center of the fundus Ef of the subject's eye E, thereby weakening the intensity of the reflected component from the center of the objective lens 11 and eliminating artifacts caused by the reflected component. Therefore, even if the angle of view is large, it becomes possible to easily obtain a high-quality image of the subject's eye E.

[0187] <Third embodiment> In the first and second embodiments, the rotating slit 50 is configured to rotate in synchronization with the pupil division rotating mirror 40, but the configuration according to the embodiments is not limited to this.

[0188] For example, by deflecting the illumination light that has passed through a slit for central scanning and the illumination light that has passed through a slit for peripheral scanning using an optical scanner, the fundus Ef can be scanned with the illumination light as in the first and second embodiments.

[0189] Hereinafter, the ophthalmologic apparatus according to the third embodiment will be described, focusing on the differences from the first embodiment.

[0190] Fig. 12 is a block diagram showing an example of the configuration of an ophthalmologic apparatus according to the third embodiment. In Fig. 12, the same components as those in Fig. 1 are given the same reference numerals, and the description thereof will be omitted as appropriate.

[0191] The main differences between the configuration of the ophthalmic device 1a of the third embodiment and the configuration of the ophthalmic device 1 of the first embodiment are that an optical system 10a is provided instead of the optical system 10, the rotation mechanism 50R is omitted, and a control unit 100a is provided instead of the control unit 100.

[0192] The main difference between the configuration of the optical system 10 a and the configuration of the optical system 10 is that, instead of the rotating slit 50 , a slit 50 a and an optical scanner 80 are provided between the illumination optical system 30 and the pupil splitting rotating mirror 40 .

[0193] The control unit 100a differs from the control unit 100 mainly in that the control unit 100a performs deflection control on the optical scanner 80 instead of rotation control on the rotation mechanism 50R.

[0194] The slit 50a includes a central slit for scanning the central portion and one or more peripheral slits for scanning one or more peripheral portions, similar to the rotating slit 50. As in the first embodiment, the central slit for scanning the central portion and the one or more peripheral slits for scanning one or more peripheral portions are selectively disposed in the imaging optical path.

[0195] The optical scanner 80 deflects light that has passed through a slit formed in the slit 50a (either the central slit or one or more peripheral slits) and guides the deflected light to the pupil division rotating mirror 40. The optical scanner 80 is disposed at a position that is optically approximately conjugate with a predetermined site in the subject's eye E. Examples of the predetermined site include the center position of the pupil and the center of gravity position of the pupil. As a result, the illumination light that has passed through the slit formed in the slit 50a is deflected with the predetermined site in the subject's eye E as the scan center position.

[0196] In some embodiments, the optical scanner 80 includes a one-axis deflection member or a two-axis deflection member perpendicular to each other. Examples of the deflection member include a galvanometer mirror, a polygon mirror, a rotating mirror, a dowel prism, a double dowel prism, a rotation prism, and a MEMS mirror scanner. When a two-axis deflection member is used, a deflection member for high-speed scanning (e.g., a polygon mirror) and a deflection member for low-speed scanning (e.g., a galvanometer mirror) can be combined. The optical scanner 80 may further include an optical element for projecting the deflected light onto the subject's eye E.

[0197] The optical scanner 80 is controlled by the control unit 100a and is capable of deflecting the illumination light that has passed through the slit formed in the slit 50a, thereby changing the irradiation position of the illumination light on the fundus Ef in at least one of the X and Y directions.

[0198] For example, illumination light deflected by the optical scanner 80 passes through a hole formed in the pupil division rotating mirror 40, is reflected by the optical element M1, transmits through the objective lens 11, and is guided to the subject's eye E. Return light from the subject's eye E transmits through the objective lens 11, is reflected by the optical element M1, is reflected by a mirror formed around the hole in the pupil division rotating mirror 40, and is guided to the image sensor 60.

[0199] The control unit 100a includes a control unit 101a and a storage unit 102a. The control unit 101a executes the same control as the control unit 101, and is capable of controlling the optical scanner 80. The storage unit 102a stores the same contents as the storage unit 102, and also stores a computer program executed by the control unit 101a.

[0200] Fig. 13 shows an example of the configuration of an optical system 10a of an ophthalmic apparatus 1a according to the third embodiment. In Fig. 13, the same parts as those in Fig. 2 are given the same reference numerals, and the description will be omitted as appropriate. As in Fig. 2, the anterior eye observation optical system 20 is also omitted in Fig. 13.

[0201] 13, a light receiving system (image sensor 60, imaging lens 13) is arranged in the reflecting direction of pupil division rotating mirror 40, and an illumination system (light source 30A, condenser lens 30B) is arranged in the transmitting direction of pupil division rotating mirror 40.

[0202] Between the pupil splitting rotating mirror 40 and the condenser lens 30B, a lens 82, an optical scanner 80, a lens 81, and a slit 50a are disposed.

[0203] The slit 50a includes a central slit 53 for scanning the central portion and one or more peripheral slits for scanning one or more peripheral portions. In Fig. 13, the slit 50a includes a single peripheral slit 54. The central slit 53 and one or more peripheral slits are selectively placed in the optical path. In this case, the moving mechanism 50D selectively places the central slit 53 and one or more peripheral slits in the optical path.

[0204] For example, in the central slit 53, a slit 51a is formed in a central region through which the photographing optical axis O passes, similar to the central rotation slit 51. The illumination light passing through the slit 51a is irradiated onto the central portion of the fundus Ef so that the illumination region rotates around the photographing optical axis O by the deflection operation of the optical scanner 80. By moving the optical system 10a in the illumination optical axis (photographing optical axis) direction by the moving mechanism 10D, the slit 51a formed in the central slit 53 can be positioned at a position that is approximately optically conjugate with the central portion including the photographing center of the fundus Ef.

[0205] For example, in the peripheral slit 54, a slit 52a is formed in the peripheral region outside the central region through which the photographing optical axis O passes, similar to the peripheral rotation slit 52. The illumination light passing through the slit 52a is irradiated onto the peripheral portion of the fundus Ef so that the illumination region rotates around the photographing optical axis O by the deflection operation of the optical scanner 80. By moving the peripheral slit 54 in the direction of the illumination optical axis (photographing optical axis) by the moving mechanism 50D, the slit 52a formed in the peripheral slit 54 can be positioned at a position that is approximately optically conjugate with the peripheral portion outside the central portion including the photographing center of the fundus Ef.

[0206] The slit 50a is an example of "two or more slits" according to the embodiment. The central slit 53 is an example of a "first slit" according to the embodiment. The peripheral slit 54 is an example of a "second slit" according to the embodiment.

[0207] 14A and 14B show an overview of an operation example of the ophthalmic apparatus 1a according to the third embodiment. FIG. 14A and 14B show a flow diagram of the operation example of the ophthalmic apparatus 1a according to the third embodiment. A computer program for realizing the processing shown in FIG. 14A and FIG. 14B is stored in the storage unit 102a of the control unit 100a. The control unit 101a of the control unit 100a operates according to the computer program to execute the processing shown in FIG. 14A and FIG. 14B.

[0208] (S21: Accepts refractive power) First, the control unit 101a receives the refractive power of the eye E, similarly to step S1.

[0209] (S22: Determine the difference between the focus positions in the center and the periphery) Next, similar to step S2, the control unit 101a determines the difference between the focus position of the illumination light for the central portion of the fundus Ef, including the center of the image capture, and the focus position of the illumination light for the peripheral portion outside the central portion, based on the refractive index of the test eye E accepted in step S21.

[0210] (S23: Move the peripheral slits) Next, similar to step S3, the control unit 101a controls the moving mechanism 50D based on the difference in focus position identified in step S22 to move the peripheral slit 54 in the direction of the illumination optical axis (broadly speaking, the imaging optical axis).

[0211] (S24: Alignment) Next, the control unit 101a controls the moving mechanism 10D to move the optical system 10a to the initial position, similarly to step S4. Thereafter, the control unit 101a controls the execution of alignment for aligning the optical system 10a with the subject's eye E.

[0212] (S25: A central rotating slit is placed in the optical path) Next, the control unit 101a controls the moving mechanism 50D to place the central slit 53 in the illumination light path (imaging light path, imaging optical axis) in the same manner as in step S5. The peripheral slit 54 is retracted from the illumination light path.

[0213] (S26: Adjust the slit position) Next, the control unit 101a controls the rotation mechanism 40R to rotate the pupil division rotating mirror 40 to a predetermined rotation start position, similar to step S6.

[0214] (S27: Focus adjustment) Next, the control unit 101a controls the moving mechanism 70D or the moving mechanism that moves the lens 12 to adjust the focus position of the illumination light, in the same manner as in step S7.

[0215] (S28: Turn on the fundus illumination light source) Next, the control unit 101a controls the light source 30A of the illumination optical system 30 to turn on the light source for fundus scanning, similarly to step S8.

[0216] (S29: Exposure begins) Next, the control unit 101a controls the image sensor 60 to start exposure to the return light of the illumination light from the fundus oculi Ef, in the same manner as in step S9.

[0217] (S30: Rotation control of pupil splitting rotating mirror, deflection control of optical scanner) Next, the control unit 101a controls the rotation mechanism 40R to start rotation of the pupil division rotation mirror 40, and also controls the optical scanner 80 to start deflection control of the illumination light. The control unit 101a synchronizes the rotation control of the pupil division rotation mirror 40 and the deflection control of the optical scanner 80 so that the illumination light passing through the pupil division rotation mirror 40 is irradiated onto an illumination area rotating around the imaging center of the fundus Ef.

[0218] In this way, a central portion scan is executed. In the central portion scan, the image sensor 60 receives the return light of the illumination light irradiated onto each illumination range.

[0219] (S31:Next?) The control unit 101a determines whether or not to execute a peripheral scan following the central scan, similarly to step S11.

[0220] When it is determined that the peripheral scan is to be performed following the central scan (S31: Y), the operation of the ophthalmic apparatus 1a proceeds to step S32. When it is determined that the peripheral scan is not to be performed following the central scan (S31: N), the operation of the ophthalmic apparatus 1a proceeds to step S35.

[0221] (S32: Peripheral slits are placed in the optical path) In step S31, when it is determined that the peripheral scan is to be executed following the central scan (S31: Y), the control unit 101a controls the moving mechanism 50D to place the peripheral slit 54 in the illumination light path (photographing optical axis) in the same manner as in step S12. The central slit 53 is retracted from the illumination light path.

[0222] (S33: Adjust the slit position) Next, similarly to step S13, the control unit 101a controls the rotation mechanism 40R to rotate the pupil division rotating mirror 40 to a predetermined rotation start position.

[0223] (S34: Rotation control of pupil splitting rotating mirror, deflection control of optical scanner) Next, the control unit 101a controls the rotation mechanism 40R to start rotation of the pupil division rotation mirror 40, and also controls the optical scanner 80 to start deflection control of the illumination light. The control unit 101a synchronizes the rotation control of the pupil division rotation mirror 40 and the deflection control of the optical scanner 80 so that the illumination light passing through the pupil division rotation mirror 40 is irradiated onto an illumination area rotating around the imaging center of the fundus Ef.

[0224] In this way, peripheral scanning is performed. In peripheral scanning, the image sensor 60 also receives return light of the illumination light irradiated onto each illumination range.

[0225] (S35: Exposure ends) Following step S34, or when it is determined in step S31 that a peripheral scan will not be performed following a central scan (S31:N), the control unit 101a controls the image sensor 60 to terminate exposure to the return light of the illumination light from the fundus Ef, as in step S15.

[0226] (S36:Display) As in step S16, the control unit 101a causes a display unit included in the display unit 120 to display an image of the fundus Ef based on the light reception results obtained in the image sensor 60 by the central scan in step S30 and the light reception results obtained in the image sensor 60 by the peripheral scan in step S34.

[0227] This is the end of the operation of the ophthalmologic apparatus 1a (END).

[0228] <effect> An ophthalmic apparatus, a control method for the ophthalmic apparatus, and a program according to an embodiment will be described.

[0229] An ophthalmic apparatus (1, 1a) according to some embodiments includes an illumination system (illumination optical system 30), a light receiving system (image sensor 60), a control unit (control unit 100, control unit 101), and an image forming unit (data processing unit 200). The illumination system irradiates illumination light onto an illumination range rotating around an imaging center at a predetermined site (fundus Ef) of the subject's eye (E). The light receiving system includes an image sensor (60) whose light receiving surface can be arranged at a position that is optically approximately conjugate with the predetermined site, and receives return light of the illumination light irradiated onto the illumination range. The control unit controls the illumination system and the light receiving system to perform a central scan that scans a central area including the imaging center with the illumination light, and one or more peripheral scans that scan one or more peripheral areas outside the central area with the illumination light. The image forming unit forms an image of the subject's eye based on a light receiving result of the return light obtained by the central scan and a light receiving result of the return light obtained by one or more peripheral scans.

[0230] According to this embodiment, it is possible to scan the central part and one or more peripheral parts of a predetermined part of the subject's eye with illumination light whose focus positions are adjusted independently of each other. Furthermore, since the predetermined part of the subject's eye is scanned with illumination light so that the illumination range rotates around the center of the image capture of the predetermined part, it is possible to weaken the intensity of the reflected component from the optical system such as the objective lens and to remove artifacts caused by the reflected component. Therefore, even if the angle of view is large, it is possible to easily obtain a high-quality image of the subject's eye in focus over the entire predetermined part.

[0231] In some embodiments, the control unit controls at least one of the illumination system and the light receiving system so as to reduce the difference between the amount of return light obtained by scanning the central area and the amount of return light obtained by scanning one or more peripheral areas.

[0232] According to this aspect, the brightness of the image obtained by scanning the central area and the brightness of the image obtained by scanning the peripheral area can be made uniform, thereby making it possible to achieve high-quality images of the subject's eye.

[0233] In some embodiments, the illumination system and the receiving system are movable in the direction of the imaging optical axis.

[0234] According to this aspect, it is possible to easily obtain an image focused on a predetermined portion of the subject's eye.

[0235] Some embodiments include a lens (12) disposed in the optical path of the illumination system and in the optical path of the receiving system and movable along the optical path.

[0236] According to this aspect, it is possible to easily obtain an image focused on a predetermined portion of the subject's eye.

[0237] Some embodiments include a pupil-splitting rotating mirror (40) that has a hole (40a) formed at a position eccentric to the imaging optical axis and connects the optical path of the illumination system and the optical path of the receiving system, the hole can be positioned at a position that is approximately optically conjugate with the pupil of the test eye, and the pupil-splitting rotating mirror can rotate the hole about the imaging optical axis in synchronization with the movement of the illumination range.

[0238] According to this aspect, the illumination light and the return light are separated by pupil division, and a higher quality image of the subject's eye in focus over the entire predetermined area can be easily obtained.

[0239] Some embodiments include a slit that can rotate around the imaging optical axis and two or more slits (central rotating slit 51, peripheral rotating slit 52) ​​that can be selectively positioned in an optical path combined by a pupil splitting rotating mirror, the two or more slits including a first slit (central rotating slit 51) having a slit (51a) formed in a central region through which the imaging optical axis passes, and one or more second slits (peripheral rotating slits 52) having a slit (52a) formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slit formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with one or more peripheral regions at a specified location.

[0240] According to this aspect, it is possible to easily obtain a high-quality image of the test eye that is in focus over the entire specified area, even when the angle of view is large, while removing artifacts caused by reflected components from the optical system such as the objective lens.

[0241] Some embodiments include an optical path splitting member (beam splitter 71) that splits the optical path combined by the pupil division rotating mirror into two or more optical paths, two or more slits (central rotating slit 51, peripheral rotating slit 52) ​​that are arranged in each of the two or more optical paths divided by the optical path splitting member and have slits formed therein that can rotate around the imaging optical axis, and an optical path combining member (beam splitter 74) that combines the two or more optical paths divided by the optical path splitting member and guides the light of the combined optical path to the test eye, wherein the two or more slits include a first slit (central rotating slit 51) in which a slit (51a) is formed in a central region through which the imaging optical axis passes, and one or more second slits (peripheral rotating slits 52) in which a slit (52a) is formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slits formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with one or more peripheral portions at a specified site.

[0242] According to this aspect, it is possible to easily obtain a high-quality image of the subject's eye in focus over the entirety of a specific area even when the angle of view is large, while removing artifacts caused by reflected components from the optical system such as the objective lens. In addition, it is possible to simultaneously perform a central scan and one or more peripheral scans, so that it is possible to more easily obtain a high-quality image of the subject's eye.

[0243] Some embodiments include two or more slits (central slit 53, peripheral slit 54) in which slits are formed and which can be selectively positioned in an optical path combined by a pupil-splitting rotating mirror, and an optical scanner (80) arranged between the pupil-splitting rotating mirror and the two or more slits and deflecting light that passes through a slit formed in any of the two or more slits so as to rotate around the center of imaging at a specified location, wherein the two or more slits include a first slit (central slit 53) in which a slit is formed in a central region through which the imaging optical axis passes, and one or more second slits (peripheral slits 54) in which slits are formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central region, and the slits formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with one or more peripheral regions at the specified location.

[0244] According to this aspect, it is possible to easily obtain a high-quality image of the subject's eye in focus over the entire predetermined area even when the angle of view is large, while removing artifacts caused by reflected components from the optical system such as the objective lens. In addition, since the illumination area is rotated around the center of photography using the optical scanner, it is possible to remove artifacts caused by reflected components from the optical system such as the objective lens with a simple configuration.

[0245] In some embodiments, the two or more slits are movable in the direction of the imaging optical axis except for any one of the two or more slits.

[0246] According to this aspect, it is possible to arrange any of the two or more slits at a position that is optically conjugate with the central portion including the imaging center and any of the one or more peripheral portions, and to arrange the other slits at a position that is optically conjugate with a desired portion of the predetermined portion. This makes it possible to obtain a high-quality image of the subject's eye that is in focus over the entire predetermined portion while simplifying the configuration.

[0247] In some embodiments, the optical system includes one or more moving mechanisms (moving mechanisms 50D) that move each of the one or more second slits in the direction of the imaging optical axis based on the refractive power of the subject's eye.

[0248] According to this aspect, it is possible to easily position each of the one or more second slits at a position that is approximately optically conjugate with one or more peripheral portions at a specified portion of the test eye, making it possible to obtain a high-quality image of the test eye that is in focus over the entire specified portion.

[0249] In some embodiments, the optical system includes one or more moving mechanisms (moving mechanisms 50D) that move each of the one or more second slits in the direction of the imaging optical axis based on OCT data of the subject's eye.

[0250] According to this aspect, it is possible to simply and accurately dispose one or more second slits at positions that are optically conjugate with one or more peripheral parts of a predetermined part of the subject's eye, thereby making it possible to obtain a high-quality image of the subject's eye in focus over the entire predetermined part.

[0251] In some embodiments, the slits formed in each of the two or more slits are formed so as to become wider as they are farther from the imaging optical axis.

[0252] According to this aspect, it is possible to easily reduce the difference between the amount of illumination light irradiated to the central portion including the center of the image capture and the amount of illumination light irradiated to one or more peripheral portions, thereby making it possible to obtain a high-quality image of the subject's eye in focus over the entire predetermined portion and with reduced unevenness in brightness.

[0253] In some embodiments, the slit formed in each of the two or more slits has a generally trapezoidal or triangular shape.

[0254] According to this aspect, it is possible to obtain a high-quality image of the subject's eye with a simple configuration, in which the entire predetermined area is in focus and luminance unevenness is reduced.

[0255] Some embodiments are a control method for an ophthalmic device (1, 1a), including an irradiation step of irradiating illumination light onto an illumination range rotating around an imaging center at a predetermined site (fundus Ef) of the test eye (E), a light receiving step of receiving return light of the illumination light irradiated onto the illumination range using an image sensor (60) whose light receiving surface can be positioned at a position approximately optically conjugate with the predetermined site, a control step of performing a central scan that scans a central area including the imaging center with the illumination light and one or more peripheral scans that scan each of one or more peripheral areas outside the central area with the illumination light, and an image formation step of forming an image of the test eye based on a light receiving result of the return light obtained by the central scan and a light receiving result of the return light obtained by the one or more peripheral scans.

[0256] According to this embodiment, it is possible to scan the central part and one or more peripheral parts of a predetermined part of the subject's eye with illumination light whose focus positions are adjusted independently of each other. Furthermore, since the predetermined part of the subject's eye is scanned with illumination light so that the illumination range rotates around the center of the image capture of the predetermined part, it is possible to weaken the intensity of the reflected component from the optical system such as the objective lens and to remove artifacts caused by the reflected component. Therefore, even if the angle of view is large, it is possible to easily obtain a high-quality image of the subject's eye in focus over the entire predetermined part.

[0257] In some embodiments, the control step controls at least one of an illumination system that irradiates illumination light and a light receiving system that receives returning light so that the difference between the amount of returning light obtained by scanning the central area and the amount of returning light obtained by scanning one or more peripheral areas is reduced.

[0258] According to this aspect, the brightness of the image obtained by scanning the central area and the brightness of the image obtained by scanning the peripheral area can be made uniform, thereby making it possible to achieve high-quality images of the subject's eye.

[0259] In some embodiments, the ophthalmic device includes a pupil-splitting rotating mirror (40) having a hole (40a) formed at a position eccentric to the imaging optical axis, which connects the optical path of an illumination system that emits illumination light with the optical path of a light-receiving system that receives the returning light, the hole can be positioned at a position that is approximately optically conjugate with the pupil of the test eye, and the control step controls the pupil-splitting rotating mirror to rotate the hole around the imaging optical axis in synchronization with the movement of the illumination range.

[0260] According to this aspect, the illumination light and the return light are separated by pupil division, and a higher quality image of the subject's eye in focus over the entire predetermined area can be easily obtained.

[0261] In some embodiments, the ophthalmic device includes a slit that can rotate around the imaging optical axis and two or more slits (central rotating slit 51, peripheral rotating slit 52) ​​that can be selectively positioned in an optical path combined by a pupil splitting rotating mirror, the two or more slits including a first slit (central rotating slit 51) having a slit (51a) formed in a central region through which the imaging optical axis passes, and one or more second slits (peripheral rotating slits 52) having a slit (52a) formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slit formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with one or more peripheral regions at a specified site.

[0262] According to this aspect, it is possible to easily obtain a high-quality image of the test eye that is in focus over the entire specified area, even when the angle of view is large, while removing artifacts caused by reflected components from the optical system such as the objective lens.

[0263] In some embodiments, the ophthalmic device includes an optical path splitting member (beam splitter 71) that splits the optical path combined by the pupil division rotating mirror into two or more optical paths, two or more slits (central rotating slit 51, peripheral rotating slit 52) ​​that are arranged in each of the two or more optical paths divided by the optical path splitting member and have slits that can rotate around the imaging optical axis, and an optical path combining member (beam splitter 74) that combines the two or more optical paths divided by the optical path splitting member and guides the light of the combined optical path to the test eye, wherein the two or more slits include a first slit (central rotating slit 51) in which a slit (51a) is formed in a central region through which the imaging optical axis passes, and one or more second slits (peripheral rotating slits 52) in which a slit (52a) is formed in each of one or more peripheral regions outside the central region through which the imaging optical axis passes, and the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slit formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with one or more peripheral portions at a predetermined site.

[0264] According to this aspect, it is possible to easily obtain a high-quality image of the subject's eye in focus over the entirety of a specific area even when the angle of view is large, while removing artifacts caused by reflected components from the optical system such as the objective lens. In addition, it is possible to simultaneously perform a central scan and one or more peripheral scans, so that it is possible to more easily obtain a high-quality image of the subject's eye.

[0265] In some embodiments, the ophthalmic device includes two or more slits (central slit 53, peripheral slit 54) in which slits are formed and which can be selectively positioned in an optical path combined by a pupil-splitting rotating mirror, and an optical scanner which is positioned between the pupil-splitting rotating mirror and the two or more slits and deflects light which has passed through a slit formed in any of the two or more slits so as to rotate around the center of shooting at a specified location, wherein the two or more slits include a first slit (central slit 53) in which a slit is formed in a central region through which the shooting optical axis passes, and one or more second slits (peripheral slits 54) in which a slit is formed in each of one or more peripheral regions outside the central region through which the shooting optical axis passes, wherein the slit formed in the first slit can be positioned at a position that is approximately optically conjugate with the central portion, and the slits formed in the one or more second slits can be positioned at a position that is approximately optically conjugate with one or more peripheral regions at the specified location.

[0266] According to this aspect, it is possible to easily obtain a high-quality image of the subject's eye in focus over the entire predetermined area even when the angle of view is large, while removing artifacts caused by reflected components from the optical system such as the objective lens. In addition, since the illumination area is rotated around the center of photography using the optical scanner, it is possible to remove artifacts caused by reflected components from the optical system such as the objective lens with a simple configuration.

[0267] In some embodiments, the slits formed in each of the two or more slits are formed so as to become wider as they are farther from the imaging optical axis.

[0268] According to this aspect, it is possible to easily reduce the difference between the amount of illumination light irradiated to the central portion including the center of the image capture and the amount of illumination light irradiated to one or more peripheral portions, thereby making it possible to obtain a high-quality image of the subject's eye in focus over the entire predetermined portion and with reduced unevenness in brightness.

[0269] In some embodiments, the slit formed in each of the two or more slits has a generally trapezoidal or triangular shape.

[0270] According to this aspect, it is possible to obtain a high-quality image of the subject's eye with a simple configuration, in which the entire predetermined area is in focus and luminance unevenness is reduced.

[0271] Some embodiments are programs for causing a computer to execute each step of any of the above-described methods for controlling an ophthalmic apparatus.

[0272] According to this embodiment, it is possible to scan the central part and one or more peripheral parts of a predetermined part of the subject's eye with illumination light whose focus positions are adjusted independently of each other. Furthermore, since the predetermined part of the subject's eye is scanned with illumination light so that the illumination range rotates around the center of the image capture of the predetermined part, it is possible to weaken the intensity of the reflected component from the optical system such as the objective lens and to remove artifacts caused by the reflected component. Therefore, even if the angle of view is large, it is possible to easily obtain a high-quality image of the subject's eye in focus over the entire predetermined part.

[0273] The embodiment described above is merely one example for carrying out the present invention. Anyone who wishes to carry out the present invention may make any modifications, omissions, additions, etc. within the scope of the gist of the present invention. [Explanation of symbols]

[0274] 1, 1a Ophthalmological equipment 10, 10a optical system 10D, 50D, 70D movement mechanism 11 Objective lens 12, 73, 75, 81, 82 Lenses 13 Imaging Lens 20 Anterior segment observation optical system 30 Illumination optical system 30A light source 30B Condenser Lens 40 Pupil division rotating mirror 40a Hole 40R, 50R rotation mechanism 50 Rotating Slit 50a slit 51 Center rotating slit 51a, 52a Slit 52 Peripheral rotating slit 53 Center slit 54 Peripheral slit 60 Image Sensor 70 Photographing Optical System 71, 74 Beam splitter 72, 76 Reflecting mirror 80 Optical Scanner 100, 100a Control unit 101, 101a Control unit 102, 102a Storage section 110 Operation unit 120 display units 200 Data Processing Units E. Examined eye Ef fundus M1 Optics

Claims

1. an illumination system including: a first slit, which can be arranged at a position optically conjugate with a central portion including an imaging center in a predetermined portion of the subject's eye, formed in a central region through which an imaging optical axis passes and which can rotate around the imaging optical axis; and one or more second slits, which can be arranged at a position optically conjugate with one or more peripheral portions outside the central portion in the predetermined portion, formed in each of one or more peripheral regions outside the central region and which can rotate around the imaging optical axis; and which irradiates illumination light onto an illumination range rotating around the imaging center in the predetermined portion; a light receiving system including an image sensor that can be arranged at a position where a light receiving surface is substantially optically conjugate with the predetermined portion, the light receiving system receiving return light of the illumination light irradiated onto the illumination range; a control unit that controls the illumination system and the light receiving system to execute a central scan in which a central area including the imaging center is scanned with the illumination light, and one or more peripheral scans in which one or more peripheral areas outside the central area are scanned with the illumination light; an image forming unit that forms an image of the subject's eye based on a light receiving result of the return light obtained by the central portion scan and a light receiving result of the return light obtained by the one or more peripheral portion scans; Including, An ophthalmic device, wherein the control unit identifies a difference between the focus position of the illumination light relative to the center and the focus position of the illumination light relative to the peripheral portion in accordance with the refractive index of the test eye, and adjusts the position of the one or more second slits relative to the first slit based on the identified position difference.

2. The control unit controls at least one of the irradiation system and the light receiving system so as to reduce a difference between an amount of the return light obtained by the central portion scan and an amount of the return light obtained by the one or more peripheral portion scans.

2. An ophthalmic apparatus according to claim 1.

3. a pupil-splitting rotating mirror having a hole formed at a position eccentric to the photographing optical axis and coupling an optical path of the illumination system and an optical path of the light receiving system; the hole portion can be arranged at a position that is approximately optically conjugate with a pupil of the subject's eye, The pupil-splitting rotating mirror is capable of rotating the hole portion around the photographing optical axis in synchronization with the movement of the illumination range.

3. An ophthalmic apparatus according to claim 1 or 2.

4. A method for controlling an ophthalmic device including a first slit that can be arranged at a position that is approximately optically conjugate with a central portion including a photographing center in a predetermined portion of a subject's eye, the first slit being formed in a central region through which a photographing optical axis passes and rotatable around the photographing optical axis, and one or more second slits that can be arranged at a position that is approximately optically conjugate with one or more peripheral portions outside the central portion in the predetermined portion, the second slits being formed in each of one or more peripheral regions outside the central region and rotatable around the photographing optical axis, an illumination step of irradiating an illumination range rotating around an imaging center in the predetermined region with illumination light; a light receiving step of receiving return light of the illumination light irradiated onto the illumination range by using an image sensor whose light receiving surface can be arranged at a position that is approximately optically conjugate with the predetermined portion; a control step of executing a central scan for scanning a central area including the imaging center with the illumination light, and one or more peripheral scans for scanning each of one or more peripheral areas outside the central area with the illumination light; an image forming step of forming an image of the subject's eye based on a result of receiving the return light obtained by the central portion scan and a result of receiving the return light obtained by the one or more peripheral portion scans; Including, A control method for an ophthalmic apparatus, wherein the control step identifies a difference between a focus position of the illumination light relative to the central portion and a focus position of the illumination light relative to the peripheral portion in accordance with the refractive power of the test eye, and adjusts the position of the one or more second slits relative to the first slit based on the identified position difference.

5. The control step controls at least one of an illumination system that irradiates the illumination light and a light receiving system that receives the return light so that a difference between an amount of the return light obtained by the central portion scan and an amount of the return light obtained by the one or more peripheral portion scans is reduced. The method for controlling an ophthalmic apparatus according to claim 4 .

6. the ophthalmologic apparatus includes a pupil-splitting rotating mirror having a hole formed at a position eccentric to the imaging optical axis and coupling an optical path of an illumination system that irradiates the illumination light and an optical path of a light-receiving system that receives the return light, the hole portion can be arranged at a position that is approximately optically conjugate with a pupil of the subject's eye, The control step controls the pupil splitting rotating mirror so as to rotate the hole portion around the photographing optical axis in synchronization with the movement of the illumination range.

6. The method for controlling an ophthalmic apparatus according to claim 4 or 5.

7. A program for causing a computer to execute each step of the method for controlling an ophthalmic apparatus according to any one of claims 4 to 6.

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