Ophthalmic device and method of controlling the same

Abstract

An ophthalmic apparatus includes a light source, an illumination optical system, a light scanner, a photographing optical system, and a control section. The illumination optical system generates slit-shaped illumination light by using light from the light source. The light scanner deflects the illumination light and guides it to a fundus of an eye to be examined. The photographing optical system guides return light of the illumination light from the fundus to an image sensor. The control section controls the image sensor by a rolling shutter method. The illumination optical system includes a slit formed with a slit-shaped opening portion capable of being disposed at a position optically substantially conjugate with the fundus, an iris diaphragm disposed between the light source and the slit and capable of being disposed at a position optically substantially conjugate with an iris of the eye to be examined, and an optical element disposed between the light source and the iris diaphragm and deflecting light from the light source.

Description

TECHNICAL FIELD

[0001] The present application relates to an ophthalmic apparatus and a control method thereof. BACKGROUND

[0002] In recent years, screening examinations are performed using an ophthalmic apparatus. Such an ophthalmic apparatus is also expected to be applied to self-tests, and further miniaturization and weight reduction are expected.

[0003] For example, an ophthalmic apparatus is disclosed in Patent Literature 1 and Patent Literature 2, which is configured to perform pattern illumination on an eye to be examined using slit light, and detect return light thereof with a CMOS (Complementary Metal Oxide Semiconductor) image sensor. The ophthalmic apparatus is capable of acquiring an image of the eye to be examined with a simple structure by adjusting the illumination pattern and the light-receiving timing of the CMOS image sensor.

[0004] Patent Literature 1: U.S. Patent No. 7831106

[0005] Patent Literature 2: U.S. Patent No. 8237835 SUMMARY

[0006] However, it is known that in a case where the pupil of the eye to be examined is a small pupil, the amount of light incident into the eye decreases, and the acquired image of the eye to be examined (particularly, the central portion) becomes dark. In addition, the image quality decreases depending on the state (refractive power, etc.) of the eye to be examined.

[0007] The present application has been achieved in view of such circumstances, and aims to provide a new technology that acquires a high-quality image of an eye to be examined without being affected by the state of the eye to be examined with a simple structure.

[0008] An ophthalmic apparatus of a first aspect of some embodiments includes: a light source; an illumination optical system that generates slit-shaped illumination light by using light from the light source; a light scanner that deflects the illumination light and guides it to a fundus of an eye to be examined; a photographing optical system that guides return light of the illumination light from the fundus to an image sensor; and a control section that controls the image sensor by a rolling shutter method so that a light-receiving result of the return light corresponding to an irradiation position of the illumination light in the fundus is acquired, the illumination optical system includes: a slit that is formed with a slit-shaped opening portion that can be disposed at a position optically substantially conjugate with the fundus; an iris diaphragm that is disposed between the light source and the slit and can be disposed at a position optically substantially conjugate with an iris of the eye to be examined; and an optical element that is disposed between the light source and the iris diaphragm and deflects light from the light source.

[0009] An ophthalmic apparatus of a second method of some embodiments includes: a light source; an illumination optical system including a slit formed with an opening portion capable of being disposed at a position optically substantially conjugate with a fundus of an eye to be examined, and generating slit-shaped illumination light by using light from the light source; a first moving mechanism moving the slit in an optical axis direction of the illumination optical system; a light scanner deflecting and guiding the illumination light to the fundus; a photographing optical system guiding return light of the illumination light from the fundus to an image sensor; and a control section controlling the image sensor by a rolling shutter method so that a light-receiving result of the return light corresponding to an irradiation position of the illumination light in the fundus is acquired, the control section controlling the first moving mechanism based on a refractive power of the eye to be examined.

[0010] In a third method of some embodiments, in the second method, the ophthalmic apparatus includes: a second moving mechanism changing at least one of a position and an orientation of the light source, the control section controlling the second moving mechanism according to a position of the slit moved by the first moving mechanism.

[0011] In a fourth method of some embodiments, in the third method, the illumination optical system includes: an iris diaphragm disposed between the light source and the slit, and capable of being disposed at a position optically substantially conjugate with an iris of the eye to be examined, the control section controlling the second moving mechanism so that light passing through the iris diaphragm passes through the opening portion.

[0012] In a fifth method of some embodiments, in the fourth method, the illumination optical system includes: a first relay lens system disposed between the light scanner and the slit, a back focal point position of the first relay lens system being a position optically substantially conjugate with the iris.

[0013] In a sixth method of some embodiments, in the fifth method, the light scanner is disposed at or near the back focal point position.

[0014] In a seventh method of some embodiments, in the fifth method or the sixth method, the ophthalmic apparatus includes: an observation light source; an optical path coupling member disposed between the first relay lens system and the iris diaphragm, and coupling an optical path of light output from the light source and an optical path of light output from the observation light source; and an observation iris diaphragm disposed between the observation light source and the optical path coupling member.

[0015] In an eighth method of some embodiments, in the fifth method or the sixth method, the ophthalmic apparatus includes: a second relay lens system disposed between the slit and the iris diaphragm, the iris diaphragm being disposed at or near a front focal point position of the second relay lens system.

[0016] In a ninth aspect of some embodiments, in the eighth aspect, at least one of the refractive power of the first lens and the refractive power of the second lens is changeable.

[0017] In a tenth aspect of some embodiments, in the ninth aspect, at least one of the refractive power of the first lens and the refractive power of the second lens is changeable in accordance with a size of an emission surface of the light source.

[0018] In an eleventh aspect of some embodiments, in any one of the eighth to tenth aspects, the ophthalmic apparatus includes: an observation light source; an optical path coupling member disposed between the second relay lens system and the iris diaphragm and coupling an optical path of light output from the light source and an optical path of light output from the observation light source; and an observation iris diaphragm disposed between the observation light source and the optical path coupling member.

[0019] In a twelfth aspect of some embodiments, in any one of the fourth to eleventh aspects, one or more opening portions through which the illumination light passes are formed on the iris diaphragm in such a manner that a beam cross section of the illumination light on a cornea, an anterior lens surface, and a posterior lens surface of the subject eye and a beam cross section of the return light from the subject eye are separated.

[0020] In a thirteenth aspect of some embodiments, in the twelfth aspect, two or more opening portions are formed on the iris diaphragm, the two or more opening portions are formed to be linearly symmetrical with respect to a straight line extending in a direction corresponding to a long side direction of the opening portion formed in the slit with respect to an optical axis of the illumination optical system.

[0021] In a fourteenth aspect of some embodiments, in the thirteenth aspect, the opening portion has an arcuate shape, a direction of a chord of the arcuate shape is substantially parallel to the direction corresponding to the long side direction of the opening portion formed in the slit.

[0022] In a fifteenth aspect of some embodiments, in any one of the fourth to fourteenth aspects, the illumination optical system includes: an optical element disposed between the light source and the iris diaphragm and deflecting light from the light source.

[0023] In a sixteenth aspect of some embodiments, in the first aspect or the fifteenth aspect, the optical element deflects light from the light source in such a manner that a light amount distribution in a direction connecting the iris diaphragm and the opening portion becomes maximum.

[0024] In a seventeenth aspect of some embodiments, in the first aspect, the fifteenth aspect, or the sixteenth aspect, the ophthalmic apparatus includes a third moving mechanism that changes at least one of a position and an orientation of the optical element, and the control section controls the third moving mechanism.

[0025] In an eighteenth aspect of some embodiments, in the first aspect, any one of the fifteenth aspect to the seventeenth aspect, the optical element includes a prism, a microlens array, or a Fresnel lens.

[0026] In a nineteenth aspect of some embodiments, there is a control method of an ophthalmic apparatus including a light source, an illumination optical system including a slit formed with a slit-shaped opening portion that can be disposed at a position optically substantially conjugate with a fundus of an eye to be examined and that generates slit-shaped illumination light by using light from the light source, a first moving mechanism that moves the slit in an optical axis direction of the illumination optical system, a light scanner that deflects and guides the illumination light to the fundus, a photographing optical system that guides return light of the illumination light from the fundus to an image sensor, and a control section that controls the image sensor by a rolling shutter method so that a light-receiving result of the return light corresponding to an irradiation position of the illumination light in the fundus is acquired. The control method of the ophthalmic apparatus includes an acquisition step of acquiring a refractive power of the eye to be examined, and a first control step of controlling the first moving mechanism based on the refractive power acquired in the acquisition step.

[0027] In a twentieth aspect of some embodiments, in the nineteenth aspect, the ophthalmic apparatus includes a second moving mechanism that changes at least one of a position and an orientation of the light source. The control method of the ophthalmic apparatus includes a second control step of controlling the second moving mechanism according to a position of the slit moved by the first moving mechanism.

[0028] In a twenty-first aspect of some embodiments, in the twentieth aspect, the illumination optical system includes an iris diaphragm disposed between the light source and the slit and capable of being disposed at a position optically substantially conjugate with an iris of the eye to be examined. In the control method of the ophthalmic apparatus, in the second control step, the second moving mechanism is controlled so that light passing through the iris diaphragm passes through the opening portion.

[0029] In a twenty-second aspect of some embodiments, in the twenty-first aspect, the illumination optical system includes an optical element disposed between the light source and the iris diaphragm and deflecting light from the light source, and the ophthalmic apparatus includes a third moving mechanism that changes at least one of a position and an orientation of the optical element. The control method of the ophthalmic apparatus includes a third control step of controlling the third moving mechanism.

[0030] In a twenty-third aspect of some embodiments, in the twenty-second aspect, the optical element includes a prism, a microlens array, or a Fresnel lens.

[0031] Further, the structures involved in the plurality of aspects can be combined arbitrarily.

[0032] According to the present application, a new technique for acquiring a high-quality image of an eye to be examined without being affected by the state of the eye to be examined with a simple structure is provided. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram showing a structure example of an optical system of an ophthalmic apparatus involved in the first embodiment.

[0034] Figure 2 is a schematic diagram showing a structure example of a control system of the ophthalmic apparatus involved in the first embodiment.

[0035] Figure 3 is a schematic diagram showing a structure example of the ophthalmic apparatus involved in the first embodiment.

[0036] Figure 4 is a working explanatory diagram of the ophthalmic apparatus involved in the first embodiment.

[0037] Figure 5 is a working explanatory diagram of the ophthalmic apparatus involved in the first embodiment.

[0038] Figure 6 is a working explanatory diagram of the ophthalmic apparatus involved in the first embodiment.

[0039] Figure 7 is a working explanatory diagram of the ophthalmic apparatus involved in the first embodiment.

[0040] Figure 8 is a working explanatory diagram of the ophthalmic apparatus involved in the first embodiment.

[0041] Figure 9 is a flowchart of a working example of the ophthalmic apparatus involved in the first embodiment.

[0042] Figure 10 is a schematic diagram showing a structure example of an ophthalmic apparatus involved in the second embodiment.

[0043] Figure 11 is a schematic diagram showing a structure example of an ophthalmic apparatus involved in the third embodiment.

[0044] Figure 12 is an explanatory diagram of a structure example of the ophthalmic apparatus involved in the third embodiment.

[0045] Figure 13is a diagram illustrating a configuration example of an ophthalmic apparatus according to a third embodiment.

[0046] Figure 14 is a diagram illustrating a configuration example of an ophthalmic apparatus according to a fourth embodiment.

[0047] Figure 15 is a diagram illustrating a configuration example of an ophthalmic apparatus according to a fourth embodiment.

[0048] Figure 16 is a diagram illustrating a configuration example of an ophthalmic apparatus according to a fifth embodiment.

[0049] Figure 17 is a diagram illustrating a configuration example of an ophthalmic apparatus according to a sixth embodiment.

[0050] Figure 18 is a diagram illustrating a configuration example of an ophthalmic apparatus according to a sixth embodiment.

[0051] Figure 19 is a diagram illustrating a configuration example of an ophthalmic apparatus according to a seventh embodiment. DETAILED DESCRIPTION

[0052] An example of an embodiment of an ophthalmic apparatus and a control method thereof according to the present application will be described in detail with reference to the accompanying drawings. In addition, as the content of the following embodiments, the content of the documents described in this specification can be appropriately cited.

[0053] The ophthalmic apparatus according to the embodiment illuminates a predetermined portion of an eye to be examined while moving the irradiation position (irradiation range) of slit-shaped illumination light, and receives return light from the predetermined portion using an image sensor in which light-receiving elements are arranged one-dimensionally or two-dimensionally. The light-receiving result of the return light is read out from the light-receiving elements on the light-receiving position of the return light corresponding to the irradiation position of the illumination light in synchronization with the timing of the movement of the irradiation position of the illumination light. In some embodiments, the predetermined portion is the anterior eye segment or the posterior eye segment. The anterior eye segment includes the cornea, the iris, the lens, the ciliary body, the zonules, and the like. The posterior eye segment includes the vitreous body, the fundus, or the vicinity thereof (the retina, the choroid, the sclera, and the like), and the like.

[0054] The control method of the ophthalmic apparatus according to the embodiment includes one or more steps of realizing the processing performed by the processor (computer) in the ophthalmic apparatus according to the embodiment. The program according to the embodiment causes the processor to perform each step of the control method of the ophthalmic apparatus according to the embodiment.

[0055] In this specification, "processor" refers to circuits such as CPU (Central Processing Unit), GPU (Graphics Processing Unit), ASIC (Application Specific Integrated Circuit), and programmable logic devices (e.g., SPLD (Simple Programmable Logic Device), CPLD (Complex Programmable Logic Device), FPGA (Field Programmable Gate Array)). A processor implements the functions involved in the embodiments by reading and executing programs stored in, for example, storage circuits or storage devices.

[0056] The following mainly describes how the ophthalmic device according to the embodiment acquires images of the fundus of the examined eye.

[0057] <First Implementation Method>

[0058] [Structure of an optical system]

[0059] Figures 1-4 The diagram shows a structural example of the ophthalmic device according to the first embodiment. Figure 1 An example of the structure of the optical system of the ophthalmic device 1 according to the first embodiment is shown. Figure 2 A block diagram showing a structural example of the control system (processing system) of the ophthalmic device 1 according to the first embodiment is shown. Figure 3 The diagram schematically illustrates the view when viewed from the direction of optical axis O. Figure 1 Example of the structure of iris aperture 21. Figure 4 Showing the view from the side or above Figure 1 Iris aperture 21 and Figure 1 The structural example of crack 22. In Figures 1-4 In the accompanying drawings, the same reference numerals are added to the same parts, and the descriptions are omitted as appropriate.

[0060] The ophthalmic device 1 includes a light source 10, an illumination optics system 20, a light scanner 30, a projection optics system 35, an imaging optics system 40, and an imaging device 50. In some embodiments, the illumination optics system 20 includes at least one of the light source 10, the light scanner 30, and the projection optics system 35. In some embodiments, the imaging optics system 40 includes the imaging device 50. In some embodiments, either the projection optics system 35 or the illumination optics system 20 includes the light scanner 30.

[0061] (Light source 10)

[0062] The light source 10 includes a visible light source that generates light in the visible light region. For example, the light source 10 generates light having a center wavelength in the wavelength range of 420 nm to 700 nm. Such a light source 10 includes, for example, an LED (Light Emitting Diode), an LD (Laser Diode), a halogen lamp, or a xenon lamp. In some embodiments, the light source 10 includes a light source capable of outputting a white light source or each color component of RGB light. In some embodiments, the light source 10 includes a light source capable of switching the output of light in the infrared region or light in the visible light region. The light source 10 is disposed at a position optically non-conjugate with the fundus Ef and the iris, respectively.

[0063] (Illumination optical system 20)

[0064] The illumination optical system 20 generates slit-shaped illumination light by using light from the light source 10. The illumination optical system 20 guides the generated illumination light to the light scanner 30.

[0065] The illumination optical system 20 includes an iris diaphragm 21, a slit 22, and a relay lens 23. Light from the light source 10 passes through an opening portion formed in the iris diaphragm 21, passes through an opening portion formed in the slit 22, and passes through the relay lens 23. The relay lens 23 includes one or more lenses. Light that has passed through the relay lens 23 is guided to the light scanner 30.

[0066] (Iris diaphragm 21)

[0067] The iris diaphragm 21 (specifically, the opening portion described below) can be disposed at a position optically substantially conjugate with the iris (pupil) of the subject eye E. In the iris diaphragm 21, one or more opening portions are formed at a position separated from the optical axis O. For example, Figure 3 As shown, in the iris diaphragm 21, opening portions 21A, 21B having a predetermined thickness are formed along the circumferential direction centered on the optical axis O. The opening portions formed in the iris diaphragm 21 define the position of incidence (shape of incidence) of the illumination light in the iris of the subject eye E. For example, Figure 3 As shown, by forming the opening portions 21A, 21B, it is possible to cause the illumination light to be incident on the eye from a position deviated from the pupil center (specifically, a position symmetrical to the pupil center) when the pupil center of the subject eye E is disposed at the optical axis O.

[0068] As Figure 4As shown, an optical element 24 is disposed between the light source 10 and the iris diaphragm 21. The optical element 24 can be disposed at a position optically substantially conjugate with the iris. The optical element 24 deflects light from the light source. The optical element 24 deflects light from the light source 10 in a manner that maximizes the light amount distribution in the direction connecting the opening portion 21A (or the opening portion 21B) formed in the iris diaphragm 21 and the opening portion formed in the slit 22. Examples of such an optical element include a prism, a microlens array, or a Fresnel lens, etc. In Figure 4 In the above embodiment, the optical element 24 is provided for each opening portion formed in the iris diaphragm 21, but the configuration can be such that one element deflects light passing through the opening portions 21A, 21B formed in the iris diaphragm 21.

[0069] Further, by changing the relative positions between the light source 10 and the opening portions formed in the iris diaphragm 21, the light amount distribution of light passing through the opening portions formed in the iris diaphragm 21 can be changed.

[0070] (Slit 22)

[0071] The slit 22 (specifically, the opening portion described later) can be disposed at a position optically substantially conjugate with the fundus Ef of the examined eye E. For example, in the slit 22, an opening portion is formed in a direction corresponding to the line direction (row direction) read by the image sensor 51 described later in a rolling shutter manner. The opening portion formed in the slit 22 defines the irradiation pattern of the illumination light in the fundus Ef of the examined eye E.

[0072] The slit 22 is movable in the optical axis direction of the illumination optical system 20 by a moving mechanism (moving mechanism 22D described later). The moving mechanism is controlled by the control section 100 described later to move the slit 22 in the optical axis direction. For example, the control section 100 controls the moving mechanism in accordance with the state of the examined eye E. Thereby, the position of the slit 22 can be moved in accordance with the state (specifically, the refractive power, the shape of the fundus Ef) of the examined eye E.

[0073] In some embodiments, the slit 22 is configured to be able to change at least one of the position and the shape of the opening portion in accordance with the state of the examined eye E without moving in the optical axis direction. For example, the function of such a slit 22 is realized by a liquid crystal shutter.

[0074] The light from the light source 10 passing through the opening portion formed in the iris diaphragm 21 is output as slit-shaped illumination light by passing through the opening portion formed in the slit 22. The slit-shaped illumination light passes through the relay lens 23 and is guided to the light scanner 30.

[0075] (Light scanner 30)

[0076] The light scanner 30 is disposed at a position optically substantially conjugate with the iris of the eye to be examined E. The light scanner 30 deflects the slit-shaped illumination light (slit-shaped light passing through the opening portion of the slit 22) that has passed through the relay lens 23. Specifically, the light scanner 30 deflects the slit-shaped illumination light for illuminating a predetermined illumination range of the fundus Ef in turn while changing the deflection angle within a predetermined deflection angle range with the iris of the eye to be examined E or the vicinity thereof as a scan center position, and guides it to the projection optical system 35. The light scanner 30 can deflect the illumination light one-dimensionally or two-dimensionally.

[0077] In the case of one-dimensional deflection, the light scanner 30 includes a galvanometer scanner that deflects the illumination light within a predetermined deflection angle range with reference to a predetermined deflection direction. In the case of two-dimensional deflection, the light scanner 30 includes a first galvanometer scanner and a second galvanometer scanner. The first galvanometer scanner deflects the illumination light in a manner that moves the irradiation position of the illumination light in a horizontal direction orthogonal to the optical axis of the illumination optical system 20. The second galvanometer scanner deflects the illumination light deflected by the first galvanometer scanner in a manner that moves the irradiation position of the illumination light in a vertical direction orthogonal to the optical axis of the illumination optical system 20. The scan manner in which the irradiation position of the illumination light is moved by the light scanner 30 includes, for example, horizontal scanning, vertical scanning, cross scanning, radial scanning, circular scanning, concentric circular scanning, spiral scanning, and the like.

[0078] (Projecting optical system 35)

[0079] The projection optical system 35 guides the illumination light deflected by the light scanner 30 to the fundus Ef of the eye to be examined E. In the embodiment, the projection optical system 35 guides the illumination light deflected by the light scanner 30 to the fundus Ef via an optical path that is coupled with the optical path of the photographing optical system 40 through the hole mirror 45 that is a light path coupling member described later.

[0080] The projection optical system 35 includes a relay lens 41, a black dot plate 42, a mirror 43, and a relay lens 44. The relay lenses 41 and 44 each include one or more lenses.

[0081] (Black dot plate 42)

[0082] The black dot plate 42 is disposed at a position optically substantially conjugate with the lens surface of the objective lens 46 or the vicinity thereof. Thereby, it is possible to prevent the reflected light from the lens surface of the objective lens 46 from being guided to the light source 10.

[0083] In this projection optical system 35, the illumination light deflected by the light scanner 30 passes through the relay lens 41, passes through the black dot plate 42, and is reflected toward the hole mirror 45 by the mirror 43.

[0084] (Photo shooting optical system 40)

[0085] The photographing optical system 40 guides the illumination light guided by the projection optical system 35 to the fundus Ef of the eye E while guiding the return light of the illumination light from the fundus Ef to the image pickup device 50.

[0086] In the photographing optical system 40, the optical path of the illumination light from the projection optical system 35 and the optical path of the return light of the illumination light from the fundus Ef are coupled. By using the hole mirror 45 as an optical path coupling member that couples these optical paths, it is possible to pupil-divide the illumination light and the return light thereof.

[0087] The photographing optical system 40 includes the hole mirror 45, an objective lens 46, a focusing lens 47, a relay lens 48, and an imaging lens 49. The relay lens 48 includes one or more lenses.

[0088] (Hole mirror 45)

[0089] A hole portion that is disposed on the optical axis of the photographing optical system 40 is formed in the hole mirror 45. The hole portion of the hole mirror 45 is disposed at a position that is optically substantially conjugate with the iris of the eye E. The hole mirror 45 reflects the illumination light from the projection optical system 35 toward the objective lens 46 in a peripheral region of the hole portion. This hole mirror 45 functions as an image pickup stop.

[0090] That is, the hole mirror 45 is configured to couple the optical path of the illumination optical system 20 (projection optical system 35) and the optical path of the photographing optical system 40 that is disposed in the direction of the optical axis passing through the hole portion, and to guide the illumination light reflected in the peripheral region of the hole portion to the fundus Ef.

[0091] (Focusing lens 47)

[0092] The focusing lens 47 is movable in the direction of the optical axis of the photographing optical system 40 by a not-illustrated moving mechanism. The moving mechanism is controlled by a control section 100 described later to move the focusing lens 47 in the direction of the optical axis. Thereby, depending on the state of the eye E, it is possible to image the return light of the illumination light passing through the hole portion of the hole mirror 45 to the light-receiving surface of the image sensor 51 of the image pickup device 50.

[0093] In this photographing optical system 40, the illumination light from the projection optical system 35 is reflected toward the objective lens 46 in the peripheral region of the hole portion formed in the hole mirror 45. The illumination light reflected in the peripheral region of the hole mirror 45 is refracted by the objective lens 46, enters the eye through the pupil of the eye E, and illuminates the fundus Ef of the eye E.

[0094] The return light of the illumination light from the fundus Ef is refracted by the objective lens 46, passes through the hole portion of the hole mirror 45, passes through the focusing lens 47, passes through the relay lens 48, and is imaged on the light-receiving surface of the image sensor 51 of the image pickup device 50 by the imaging lens 49.

[0095] (camera 50)

[0096] The camera 50 includes an image sensor 51 that receives return light of the illumination light guided from the fundus Ef of the eye E through the photographing optical system 40. The camera 50 is controlled by the control section 100 described later, and is capable of performing reading control of the light-receiving result of the return light.

[0097] (image sensor 51)

[0098] The image sensor 51 realizes a function as a pixelated light-receiving device. The light-receiving surface (detection surface, image-capturing surface) of the image sensor 51 can be disposed at a position optically substantially conjugate with the fundus Ef.

[0099] The light-receiving result of the image sensor 51 is controlled by the control section 100 described later, and is read by a rolling shutter method.

[0100] Such an image sensor 51 includes a CMOS image sensor. In this case, the image sensor 51 includes a plurality of pixel (light-receiving element) groups arranged in a row direction and a plurality of pixels arranged in a column direction. Specifically, the image sensor 51 includes a plurality of pixels arranged two-dimensionally, a plurality of vertical signal lines, and a horizontal signal line. Each pixel includes a photodiode (light-receiving element) and a capacitor. The plurality of vertical signal lines are provided in each pixel group in a column direction (vertical direction) orthogonal to the row direction (horizontal direction). Each vertical signal line is selectively electrically connected to a pixel group in which a charge corresponding to a light-receiving result is accumulated. The horizontal signal line is selectively electrically connected to the plurality of vertical signal lines. Each pixel accumulates a charge corresponding to a light-receiving result of the return light, and the accumulated charge is sequentially read in each pixel group in, for example, the row direction. For example, a voltage corresponding to the charge accumulated in each pixel is supplied to the vertical signal line for each line in the row direction. The plurality of vertical signal lines are selectively electrically connected to the horizontal signal line. By sequentially performing the reading operation of each line in the row direction in the vertical direction, the light-receiving result of the plurality of pixels arranged two-dimensionally can be read.

[0101] The light-receiving result of the return light is read (read out) by the rolling shutter method for such an image sensor 51, whereby a light-receiving image corresponding to a desired virtual opening shape extending in the row direction is acquired. For example, such a control is disclosed in U.S. Patent No. 8237835 specification and the like.

[0102] Figure 5 An operation explanatory diagram of the ophthalmic apparatus 1 according to the embodiment is shown in FIG. 12. Figure 5 The irradiation range IP of the slit-shaped illumination light irradiated to the fundus Ef and the virtual opening range OP in the light-receiving surface SR of the image sensor 51 are schematically shown.

[0103] For example, the control unit 100, described later, uses the light scanner 30 to deflect the slit-shaped illumination light formed by the illumination optical system 20. As a result, in the fundus Ef, the illumination range IP of the slit-shaped illumination light moves sequentially in a direction orthogonal to the slit direction (e.g., the row direction, the horizontal direction) (e.g., the vertical direction).

[0104] On the light-receiving surface SR of the image sensor 51, the control unit 100 (described later) changes the pixels of the read-object in line units, thereby setting a virtual aperture range OP. Ideally, the aperture range OP should be the light-receiving range IP′ of the illumination light returning from the light-receiving surface SR, or a range greater than the light-receiving range IP′. The control unit 100 (described later) performs movement control of the aperture range OP synchronously with the movement control of the illumination range IP. Therefore, it is not affected by unwanted scattered light, and a high-quality image of the fundus Ef with high contrast can be obtained with a simple structure.

[0105] Figure 6 and Figure 7 The diagram schematically illustrates an example of control timing for a rolling shutter mode of image sensor 51. Figure 6 An example of timing for reading control of image sensor 51 is shown. Figure 7 This indicates that the timing of the movement control of the illumination range IP (light-receiving range IP′) is superimposed on... Figure 6 The diagram is generated by timing the read control. Figure 6 and Figure 7 In the diagram, the horizontal axis represents the number of rows in the image sensor 51, and the vertical axis represents time.

[0106] In addition, Figure 6 and Figure 7 For ease of explanation, the image sensor 51 with 1920 rows is described in this embodiment, but the structure described in this embodiment is not limited to the number of rows. Furthermore, in Figure 7 For ease of explanation, the slit width (width in the row direction) of the slit-shaped illumination light is set to approximately 40 rows.

[0107] The horizontal readout control includes reset control, exposure control, charge transfer control, and output control. Reset control initializes the amount of charge accumulated in the pixels along the horizontal direction. Exposure control directs light onto the photodiode and causes the corresponding charge to accumulate in the capacitor. Charge transfer control transfers the charge accumulated in the pixels to the vertical signal lines. Output control outputs the charge accumulated in multiple vertical signal lines via the horizontal signal lines. That is, as... Figure 6As shown, the read time T of the amount of charge accumulated in the pixels in the row direction is the sum of the time Tr required for reset control, the time (exposure time) Te required for exposure control, the time Tc required for charge transfer control, and the time Tout required for output control.

[0108] In Figure 6 , the read start timing (start timing of time Tc) is shifted in units of rows, whereby the light receiving result (amount of charge) accumulated in the desired range of pixels in the image sensor 51 is obtained. For example, in the case of the pixel range shown in Figure 6 , which is equivalent to one frame of an image, the frame rate FR is uniquely determined.

[0109] In the present embodiment, the irradiation position of the illumination light having a plurality of slit widths corresponding to the number of rows in the fundus Ef is shifted in the fundus Ef in the direction corresponding to the column direction in order.

[0110] For example, as shown in Figure 7 , the irradiation position of the illumination light in the fundus Ef is shifted in units of rows in the direction corresponding to the column direction at a predetermined shift time Δt. The shift time Δt is obtained by dividing the exposure time Te of the pixels in the image sensor 51 by the slit width (for example, 40) of the illumination light (Δt = Te / 40). In synchronization with the movement timing of the irradiation position, the read start timing of each row of pixels is delayed in units of shift time Δt. Thus, a high-quality image of the fundus Ef with strong contrast can be obtained in a short time with simple control.

[0111] In some embodiments, the image sensor 51 is constituted by one or more line sensors.

[0112] [Structure of Control System]

[0113] As shown in Figure 2 , the control system of the ophthalmic apparatus 1 is constituted with the control section 100 at the center. Furthermore, at least a part of the structure of the control system can also be included in the ophthalmic apparatus 1.

[0114] (Control Section 100)

[0115] The control section 100 controls each section of the ophthalmic apparatus 1. The control section 100 includes a main control section 101 and a storage section 102. The main control section 101 includes a processor, and performs processing in accordance with a program stored in the storage section 102, whereby control processing of each section of the ophthalmic apparatus 1 is performed.

[0116] (Main Control Section 101)

[0117] The main control section 101 performs control of the light source 10, the moving mechanism 10D, control of the illumination optical system 20, control of the light scanner 30, control of the photographing optical system 40, control of the image pickup device 50, and control of the data processing section 200.

[0118] The control of the light source 10 includes switching of lighting, extinction (or wavelength region of light) of the light source, and change control of the light amount of the light source.

[0119] The moving mechanism 10D changes at least one of the position and the orientation of the light source 10 by a known mechanism. The main control section 101 can change at least one of the relative position and the relative orientation of the light source 10 with respect to the iris diaphragm 21 and the slit 22.

[0120] The control of the illumination optical system 20 includes control of the moving mechanism 22D. The moving mechanism 22D moves the slit 22 in the optical axis direction of the illumination optical system 20. The main control section 101 controls the moving mechanism 22D in accordance with the state of the examined eye E, thereby disposing the slit 22 at a position corresponding to the state of the examined eye E. The state of the examined eye E includes the shape of the fundus Ef, the refractive power, the axial length, and the like. The refractive power can be acquired by a known refractometer disclosed in, for example, Japanese Patent Application Publication No. S61-293430 or Japanese Patent Application Publication No. 2010-259495. The axial length can be acquired from the measurement value of a known axial length measuring device or an optical coherence tomograph.

[0121] For example, first control information in which the position of the slit 22 on the optical axis of the illumination optical system 20 is previously associated with the refractive power is stored in the storage section 102. The main control section 101 refers to the first control information to specify the position of the slit 22 corresponding to the refractive power, and controls the moving mechanism 22D to dispose the slit 22 at the specified position.

[0122] Here, with the movement of the slit 22, the light amount distribution of light passing through the opening portion of the slit 22 changes. At this time, as described above, the main control section 101 can change the position and the orientation of the light source 10 by controlling the moving mechanism 10D.

[0123] Figure 8 A explanatory diagram showing the control content of the main control section 101 according to the embodiment is shown in FIG. 10. In Figure 8 In FIG. 10, the same reference numerals are attached to the same parts as Figures 1-4 in FIG. 9, and the explanation is appropriately omitted.

[0124] As described above, the position of the slit 22 is moved from the position of the slit 22' before the movement in accordance with the state of the examined eye E. Thereby, the light amount distribution of light passing through the opening portion of the slit 22 changes.

[0125] At this time, the main control section 101 controls the moving mechanism 10D, whereby the relative position of the iris diaphragm 21 to the light source 10 is changed. By changing the relative position of the opening portions 21A, 21B formed in the iris diaphragm 21 to the light source 10, the light amount distribution of the light passing through the opening portions 21A, 21B is changed. Also, the light amount distribution of the light passing through the opening portions 21A, 21B of the iris diaphragm 21 in the opening portions formed in the slit 22 is changed.

[0126] The main control section 101 can control the moving mechanism 10D in accordance with the refractive power of the examined eye E as the state of the examined eye E, the position after the movement of the slit 22 (or the moving direction and the moving amount of the slit 22 with respect to the reference position).

[0127] For example, second control information of at least one of the position and the orientation of the light source 10 corresponding to the refractive power, the position after the movement of the slit 22 (or the moving direction and the moving amount of the slit 22 with respect to the reference position) is stored in the storage section 102 in advance. The main control section 101 refers to the second control information to specify at least one of the position and the orientation of the light source 10 corresponding to the refractive power or the position after the movement of the slit 22, and controls the moving mechanism 10D to arrange the light source 10 at the specified position or orientation.

[0128] In the Figure 2 , the control of the light scanner 30 includes the control of the scanning range (the scanning start position and the scanning end position) and the scanning speed.

[0129] The control of the photographing optical system 40 includes the control of the moving mechanism 47D. The moving mechanism 47D moves the focus lens 47 in the optical axis direction of the photographing optical system 40. The main control section 101 can control the moving mechanism 47D on the basis of the analysis result of the image acquired using the image sensor 51. Also, the main control section 101 can control the moving mechanism 47D on the basis of the operation content of the user using the operation section 110 described later.

[0130] The control of the image pickup device 50 includes the control of the image sensor 51 (rolling shutter control). The control of the image sensor 51 includes reset control, exposure control, charge transfer control, output control, and the like. Also, it is possible to change the time Tr required for the reset control, the time (exposure time) Te required for the exposure control, the time Tc required for the charge transfer control, the time Tout required for the output control, and the like.

[0131] The control of the data processing section 200 includes various image processing, analysis processing with respect to the light reception result acquired from the image sensor 51. The image processing includes noise removal processing with respect to the light reception result, brightness correction processing for easily recognizing a predetermined portion drawn on a light reception image based on the light reception result. The analysis processing includes specific processing of the focus state, and the like.

[0132] The data processing section 200 forms a light-receiving image corresponding to an arbitrary opening range, based on a light-receiving result read from the image sensor 51 by the rolling shutter method by receiving control from the main control section 101 (control section 100). The data processing section 200 sequentially forms light-receiving images corresponding to the opening ranges, and can form an image of the eye E to be examined from the plurality of formed light-receiving images.

[0133] The data processing section 200 includes a processor that performs processing in accordance with a program stored in a storage section or the like, and thereby realizes the above-described functions.

[0134] In some embodiments, the light source 10 includes two or more light sources. In this case, the two or more light sources are respectively provided in correspondence with the two or more opening portions formed in the iris diaphragm 21. The main control section 101 can change at least one of the position and the orientation (orientation in a direction in which the light amount distribution is largest) of each light source by controlling the moving mechanism respectively provided in correspondence with the two or more light sources.

[0135] In some embodiments, the optical element 24 can change at least one of the position and the orientation with respect to the opening portion formed in the iris diaphragm 21. For example, the main control section 101 can change at least one of the position and the orientation by controlling the moving mechanism that moves the optical element 24.

[0136] (Storage section 102)

[0137] The storage section 102 stores various computer programs, data. The computer programs include an arithmetic program for controlling the ophthalmic apparatus 1, a control program.

[0138] (Operation section 110)

[0139] The operation section 110 includes an operation device or an input device. The operation section 110 includes a button, a switch (for example, an operation handle, an operation knob, or the like), an operation device (a mouse, a keyboard, or the like) provided in the ophthalmic apparatus 1. In addition, the operation section 110 can also include any operation device, input device such as a trackball, an operation panel, a switch, a button, a dial, and the like.

[0140] (Display section 120)

[0141] The display section 120 displays an image of the eye E to be examined generated by the data processing section 200. The display section 120 is configured to include a display device such as a flat panel display such as an LCD (Liquid Crystal Display). In addition, the display section 120 can also include various display devices such as a touch panel provided in the housing of the ophthalmic apparatus 1.

[0142] Furthermore, the operation unit 110 and the display unit 120 do not need to be configured as separate devices. For example, a device integrating display and operation functions can be used, such as a touch panel. In this case, the operation unit 110 is configured to include the touch panel and a computer program. Operation content for the operation unit 110 is input to the control unit 100 as an electrical signal. Alternatively, operation and information input can be performed using a graphical user interface (GUI) displayed on the display unit 120 and the operation unit 110. In some embodiments, the functions of the display unit 120 and the operation unit 110 are implemented through a touch screen.

[0143] (Other structures)

[0144] In some embodiments, the ophthalmic device 1 also includes a fixation projection system. For example, in Figure 1 In the structure of the optical system shown, the optical path of the fixation projection system is coupled to the optical path of the imaging optical system 40. The fixation projection system can present either an internal fixed target or an external fixed target to the examined eye E. When presenting an internal fixed target to the examined eye E, the fixation projection system includes an LCD that displays the internal fixed target under control from the control unit 100, and projects a fixation beam output from the LCD onto the fundus of the examined eye E. The LCD is configured to change the display position of the fixed target on its screen. By changing the display position of the fixed target on the LCD, the projection position of the fixed target in the fundus of the examined eye E can be changed. The user can specify the display position of the fixed target on the LCD using the operation unit 110.

[0145] In some embodiments, the ophthalmic device 1 includes an alignment system. In some embodiments, the alignment system includes an XY alignment system and a Z alignment system. The XY alignment system is used to align the device optics system with the examined eye E in a direction intersecting the optical axis of the device optics system (objective lens 46). The Z alignment system is used to align the device optics system with the examined eye E in the direction of the optical axis of the ophthalmic device 1 (objective lens 46).

[0146] For example, the XY alignment system projects a bright spot (a bright spot in the infrared or near-infrared region) onto the eye being examined, E. The data processing unit 200 acquires an anterior eye image of the eye being examined, E, after the bright spot has been projected, and calculates the displacement of the bright spot image plotted on the acquired anterior eye image relative to the alignment reference position. The control unit 100 moves the device optical system and the eye being examined relative to each other in a direction intersecting the optical axis via a movement mechanism (not shown) to eliminate the calculated displacement.

[0147] For example, the Z alignment system projects an alignment light in the infrared region or near infrared region from a position deviated from the optical axis of the device optical system, and receives the alignment light reflected at the anterior eye portion of the examined eye E. The data processing portion 200 specifies the distance of the examined eye E with respect to the device optical system, based on the light receiving position of the alignment light which changes in correspondence with the distance of the examined eye E with respect to the device optical system. The control portion 100 relatively moves the device optical system and the examined eye E in the direction of the optical axis by a movement mechanism not shown, so that the specified distance becomes the desired working distance.

[0148] In some embodiments, the function of the alignment system is implemented by two or more anterior eye portion cameras configured at positions separated from the optical axis of the device optical system. For example, as disclosed in Japanese Patent Application Publication No. 2013-248376, the data processing portion 200 analyzes anterior eye portion images of the examined eye E acquired substantially simultaneously by the two or more anterior eye portion cameras, and specifies the three-dimensional position of the examined eye E using a known triangulation method. The control portion 100 relatively moves the device optical system and the examined eye E three-dimensionally by a movement mechanism not shown, so that the optical axis of the device optical system and the axis of the examined eye E become substantially coincident and the distance of the device optical system with respect to the examined eye E becomes the predetermined working distance.

[0149] The movement mechanism 22D is an example of the "first movement mechanism" involved in the embodiments. The movement mechanism 10D is an example of the "second movement mechanism" involved in the embodiments. A movement mechanism (not shown) that changes at least one of the position and orientation of the optical element 24 is an example of the "third movement mechanism" involved in the embodiments.

[0150] [Operation]

[0151] Next, the operation of the ophthalmic device 1 will be described.

[0152] Figure 9 A flowchart showing an example of the operation of the ophthalmic device 1 involved in the embodiments is shown in FIG. 10. The computer program for implementing the processing shown in FIG. 10 is stored in the storage portion 102. The main control portion 101 operates in accordance with the computer program, thereby executing the processing shown in FIG. 10. Figure 9 A flowchart showing an example of the operation of the ophthalmic device 1 involved in the embodiments is shown in FIG. 10. The computer program for implementing the processing shown in FIG. 10 is stored in the storage portion 102. The main control portion 101 operates in accordance with the computer program, thereby executing the processing shown in FIG. 10. Figure 9 A flowchart showing an example of the operation of the ophthalmic device 1 involved in the embodiments is shown in FIG. 10. The computer program for implementing the processing shown in FIG. 10 is stored in the storage portion 102. The main control portion 101 operates in accordance with the computer program, thereby executing the processing shown in FIG. 10.

[0153] Here, the alignment of the device optical system with respect to the examined eye E is performed by an alignment system not shown, to project a fixation target to the fundus of the examined eye E in such a manner that the fixation target is guided to the desired fixation position by a fixation projection system not shown.

[0154] (S1: Acquire refractive power)

[0155] First, the main control portion 101 acquires the refractive power of the examined eye E from an external ophthalmic measuring device or electronic medical record.

[0156] (S2: Change the position of the slit)

[0157] Next, the main control section 101 changes the position of the slit 22 in the optical axis of the illumination optical system 20, based on the refractive power of the eye E acquired in step S1.

[0158] Specifically, the main control section 101 refers to the first control information stored in the storage section 102, specifies the position of the slit 22 corresponding to the refractive power, and controls the moving mechanism 22D in such a manner that the slit 22 is disposed at the specified position.

[0159] (S3: Change the position or orientation of the light source)

[0160] Next, the main control section 101 changes at least one of the position and the orientation of the light source 10, based on the new position of the slit 22 whose position in the optical axis is changed in step S2.

[0161] Specifically, the main control section 101 refers to the second control information stored in the storage section 102, specifies at least one of the position and the orientation of the light source 10 corresponding to the refractive power or the position after the movement of the slit 22. Thereafter, the main control section 101 controls the moving mechanism 10D in such a manner that the light source 10 is disposed at the specified position or orientation.

[0162] (S4: Irradiate the illumination light)

[0163] Next, the main control section 101 causes the slit-shaped illumination light to be generated by the illumination optical system 20, causes the light scanner 30 to start deflection control, and thereby starts irradiation of the illumination light against the desired irradiation range in the fundus Ef. When the irradiation of the illumination light is started, the slit-shaped illumination light is sequentially irradiated in the desired irradiation range, as described above.

[0164] (S5: Acquire the light-receiving result)

[0165] As described above, the main control section 101 acquires the light-receiving result of the pixel in the opening range of the image sensor 51 corresponding to the irradiation range of the illumination light in the fundus Ef performed in step S4.

[0166] (S6: Next irradiation position?)

[0167] The main control section 101 determines whether there is an irradiation position to be next irradiated with the illumination light. The main control section 101 can determine whether there is an irradiation position to be next irradiated with the illumination light by determining whether the irradiation range of the illumination light sequentially moved covers the predetermined imaging range of the fundus Ef.

[0168] When it is determined that there is an irradiation position to be irradiated with the illumination light next (S6: YES), the operation of the ophthalmic apparatus 1 shifts to step S4. When it is not determined that there is an irradiation position to be irradiated with the illumination light next (S6: NO), the operation of the ophthalmic apparatus 1 shifts to step S7.

[0169] (S7: Forming an image)

[0170] In step S6, when it is not determined that there is an irradiation position to be irradiated with the illumination light next (S6: NO), the main control section 101 causes the data processing section 200 to form an image of the eye E according to the light reception results obtained by the repetition while changing the irradiation range of the illumination light in step S5.

[0171] For example, the data processing section 200 synthesizes a plurality of light reception results in which the irradiation ranges (the opening ranges in the light reception surface SR of the image sensor 51) of the illumination light of the processes of steps S4 to S6 differ from each other according to the moving order of the irradiation ranges. Thereby, an image of the fundus Ef corresponding to one frame is formed.

[0172] In some embodiments, in step S4, the irradiation range is set in such a manner that the illumination light is irradiated so as to set an area overlapping with the adjacent irradiation range. Thereby, in step S7, the images are synthesized in such a manner that the overlapping areas overlap with each other, and thereby an image of the fundus Ef corresponding to one frame is formed.

[0173] The operation of the ophthalmic apparatus 1 ends (End) above.

[0174] <Second Embodiment>

[0175] The structure of the ophthalmic apparatus according to the embodiments is not limited to the structure described in the first embodiment. For example, the ophthalmic apparatus according to the second embodiment is capable of obtaining a captured image of the fundus Ef and an observed image of the fundus Ef. In this case, the light source 10 functions as a light source for capturing, and another light source different from the light source 10 functions as a light source for observation. The captured image is obtained by the same rolling shutter method as in the first embodiment. The observed image is also obtained by the same rolling shutter method as in the captured image.

[0176] Hereinafter, the structure of the ophthalmic apparatus according to the second embodiment will be described focusing on the points of difference from the first embodiment.

[0177] Figure 10 A structure example of the ophthalmic apparatus according to the second embodiment is shown in FIG. 10. In FIG. 10, the same parts as in FIG. 1 are attached with the same reference numerals, and the description will be appropriately omitted. Figure 10 In FIG. 10, the same parts as in FIG. 1 are attached with the same reference numerals, and the description will be appropriately omitted. Figure 1

[0178] ​The ophthalmic apparatus 1a according to the second embodiment differs from the ophthalmic apparatus 1 according to the first embodiment in that the illumination optical system 20a is provided instead of the illumination optical system 20, and the light source 10a is added.

[0179] The illumination optical system 20a differs from the illumination optical system 20 in that the dichroic mirror 25 and the observation iris diaphragm 21a are added as light path coupling members. The dichroic mirror 25 is disposed between the slit 22 and the iris diaphragm 21, and couples the light path of the light from the light source 10a with the light path of the light from the light source 10. The observation iris diaphragm 21a is disposed between the light source 10a and the dichroic mirror 25.

[0180] The light source 10a includes an infrared light source that generates light in the infrared region. In some embodiments, the light source 10a includes a near-infrared light source that generates light in the near-infrared region. For example, the light source 10a generates light having a center wavelength in a wavelength range of 800 nm to 2500 nm. Such a light source 10a includes, for example, an LED, an LD, a halogen lamp, or a xenon lamp. The light source 10a is disposed at a position optically non-conjugate with the fundus Ef and the iris, respectively.

[0181] The observation iris diaphragm 21a (specifically, the opening portion) can be disposed at a position optically substantially conjugate with the iris (pupil) of the subject eye E. The observation iris diaphragm 21a has the same structure as the iris diaphragm 21, and is formed with one or more opening portions.

[0182] The dichroic mirror 25 transmits the light from the light source 10, and reflects the light from the light source 10a toward the light scanner 30.

[0183] In the present embodiment, the image sensor 51 can detect light in the visible light region and light in the infrared region. At this time, the control section according to the second embodiment performs the same control on the light source 10a as on the light source 10. For example, the control section turns on the light source 10 and turns off the light source 10a when photographing the fundus Ef, and turns on the light source 10a and turns off the light source 10 when observing the fundus Ef.

[0184] In the case where the light source 10 is turned on, the visible light output from the light source 10 passes through the opening portion formed in the iris diaphragm 21, transmits the dichroic mirror 25, passes through the opening portion formed in the slit 22, passes through the relay lens 23, and is guided to the light scanner 30. The light guided to the light scanner 30 illuminates the fundus Ef in the same manner as in the first embodiment. The return light from the fundus Ef is guided to the image pickup device 50. That is, in the same manner as in the first embodiment, a photographing image is acquired by the rolling shutter method.

[0185] In the case where the light source 10a is lit, infrared light (or near-infrared light) output from the light source 10a passes through the opening portion of the iris diaphragm 21a, is reflected by the dichroic mirror 25, passes through the opening portion of the slit 22, passes through the relay lens 23, and is guided to the light scanner 30. The light guided to the light scanner 30 illuminates the fundus Ef in the same manner as in the first embodiment. The returning light from the fundus Ef is guided to the image pickup device 50. That is, the observation image is acquired by the same rolling shutter method as in the first embodiment. The observation image is used for, for example, the position alignment of the optical system with respect to the subject eye E and the observation of the photographing site of the fundus Ef and the like.

[0186] The operation of the ophthalmic apparatus 1a according to the second embodiment is the same as that of the ophthalmic apparatus 1 according to the first embodiment, and thus detailed description is omitted.

[0187] The light source 10 is an example of the "photographing light source" according to the embodiments. The light source 10a is an example of the "observation light source" according to the embodiments. The dichroic mirror 25 is an example of the "light path coupling member" according to the embodiments. The iris diaphragm 21a is an example of the "observation iris diaphragm" according to the embodiments.

[0188] According to the second embodiment, it is possible to acquire an observation image while securing the illuminance required for photographing a fundus in a simple structure, and to acquire a high-quality image of a subject eye without being affected by the state of the subject eye.

[0189] Further, in the second embodiment, the case where the light path of the light of the observation light source and the light path of the light of the photographing light source are coupled with respect to the position of the slit 22 on the light source 10 side is described, but the structure according to the embodiments is not limited to this. The light path of the light of the observation light source and the light path of the light of the photographing light source can be coupled at any position from the objective lens 46 to the iris diaphragm 21. In some embodiments, the structure is such that the light from the observation light source does not pass through the objective lens 46 but is incident into the eye through the pupil.

[0190] <Third Embodiment>

[0191] In the described embodiments, the shape of the opening portion of the iris diaphragm 21 is the shape shown in FIG. 12, but the shape of the opening portion of the iris diaphragm according to the embodiments is not limited to the shape shown in FIG. 12. Figure 3 Figure 3

[0192] ​​Specifically, in the iris aperture according to the embodiment, in the reflection portion of the path of the illumination light in the examined eye E, one or more openings are formed in such a way that the beam cross-section of the illumination light (illumination beam cross-section) is separated from the beam cross-section of the returning light from the examined eye E (fundus Ef) (imaging beam cross-section). The shape of the opening formed in the iris aperture is not limited as long as the illumination beam cross-section and the imaging beam cross-section are separated in the reflection portion. The reflection portion includes the cornea (anterior corneal surface, posterior corneal surface), the anterior lens surface, the posterior lens surface, etc.

[0193] Figure 11 An example of the structure of the iris aperture according to the third embodiment is shown. Figure 11 China and Israel are able to Figure 3 The iris aperture 60 of the third embodiment is shown in comparison with the iris aperture 21 shown in the figure.

[0194] Similar to iris aperture 21, one or more openings are formed on iris aperture 60 (in Figure 11 In the middle, openings 60A and 60B). Similar to openings 21A and 21B, openings 60A and 60B are formed symmetrically with respect to a position passing through the optical axis O in a direction corresponding to the long side direction of the slit 22. The shape of the inner diameter of openings 60A and 60B is defined by a straight line connecting two points on the inner diameter of openings 21A and 21B, such that the distance changes in the direction corresponding to the short side direction of the slit 22 of the iris aperture 21A and 21B.

[0195] That is, the openings 60A and 60B are each in the shape of a circular segment. The circular segment is a region surrounded by a circular or elliptical lower arc and the chord of the lower arc. The direction of the chord of the circular segment is approximately parallel to the direction of the long side corresponding to the opening formed in the fissure 22.

[0196] Figure 12 The diagram schematically illustrates an example of the beam cross-section on the pupil of the examined eye E when the eye is illuminated using an iris aperture 60.

[0197] Light passing through openings 60A and 60B formed in the iris aperture 60 enters the eye through the pupil in a manner that forms beam cross-sections IR1 and IR2, for example. Beam cross-section IR1 is, for example, the beam cross-section of light passing through opening 60A. Beam cross-section IR2 is, for example, the beam cross-section of light passing through opening 60B.

[0198] The reflected light (shooting light) that enters the eye and is reflected by the fundus Ef forms, for example, a beam section PR on the pupil and is guided to the shooting optical system 40.

[0199] At this time, the opening portions 60A, 60B are formed so as to separate the beam sections IR1, IR2 of the illumination light and the beam section PR of the photographing light.

[0200] Figure 13 Fig. 6 schematically shows the illumination beam sections and the photographing beam section in each portion of the eye E when the eye E is illuminated using the iris diaphragm 60. Figure 13 The footprints FP1 to FP3 schematically show the footprints of the light beam when the light scanner 30 is deflected by a predetermined deflection angle. The footprint FP1 shows the light beam section on the corneal surface. The footprint FP2 shows the light beam section on the anterior surface of the lens (the iris surface) (or the photographing diaphragm surface). The footprint FP3 shows the light beam section on the posterior surface of the lens.

[0201] The anterior surface of the lens (the iris surface) (or the photographing diaphragm surface) is a position optically substantially conjugate with the iris diaphragm 60, and thus the same illumination beam sections IR12, IR22 and the photographing beam section PR2 are formed as shown in the footprint FP2. Figure 12 The shapes of the illumination beam sections IR12, IR22 are substantially the same as the shapes of the opening portions 60A, 60B of the iris diaphragm 60. The shape of the photographing beam section PR2 is substantially the same as the shape of the photographing diaphragm (the opening portion of the hole mirror 45). On the position optically substantially conjugate with the iris diaphragm 60, the illumination beam section and the photographing beam section are separated as shown in the footprint FP2.

[0202] On the corneal surface which is not optically conjugate with the iris diaphragm 60, the illumination beam sections IR11, IR21 and the photographing beam section PR1 are expanded in the direction corresponding to the long side direction of the slit 22 (the footprint FP1). On the other hand, the relative relationship between the illumination beam sections IR11, IR21 and the photographing beam section PR1 in the direction corresponding to the short side direction of the slit 22 is not changed.

[0203] Similarly, on the posterior surface of the lens which is not optically conjugate with the iris diaphragm 60, the illumination beam sections IR13, IR23 and the photographing beam section PR3 are expanded in the direction corresponding to the long side direction of the slit 22 (the footprint FP3). On the other hand, the relative relationship between the illumination beam sections IR13, IR23 and the photographing beam section PR3 in the direction corresponding to the short side direction of the slit 22 is not changed.

[0204] On the position which is not optically conjugate with the iris diaphragm 60, when the deflection angle of the illumination light is changed by the light scanner 30, the positions of the illumination beam section and the photographing beam section are moved in the direction corresponding to the short side direction of the slit 22. The relative relationship between the illumination beam section and the photographing beam section as shown in the footprints FP1, FP3 is maintained even if the deflection angle is changed.

[0205] Thus, as shown in Fig. 6, the illumination beam sections IR11, IR12, IR13, IR21, IR22, IR23 and the photographing beam section PR1 to PR3 are formed in the eye E. Figure 12 As shown, the opening portion 60A formed in the iris diaphragm 60 is required to be formed so that the distance d1 in the direction corresponding to the short side direction of the slit 22 of the lower end of the illumination beam cross section (beam cross section IR1) and the upper end of the photographing beam cross section (beam cross section PR) is a predetermined first distance or more. Similarly, as shown in Figure 12 As shown, the opening portion 60B formed in the iris diaphragm 60 is required to be formed so that the distance d2 of the upper end of the illumination beam cross section (beam cross section IR2) and the lower end of the photographing beam cross section (beam cross section PR) is a predetermined second distance or more. Here, the first distance can be the same as the second distance. Further, as shown in Figure 13 As shown, the opening portions 60A, 60B formed in the iris diaphragm 60 are required to be formed so that the distance d3 in the direction corresponding to the short side direction of the slit 22 is a predetermined third distance or more.

[0206] That is, the shape of the inner diameter of the opening portions 60A, 60B does not affect the shape of the illumination beam cross section and the shape of the photographing beam cross section.

[0207] As described above, the opening portions 60A, 60B are formed in the iris diaphragm 60 so that the illumination beam cross section and the photographing beam cross section are separated at the cornea, the anterior surface of the lens, and the posterior surface of the lens of the examined eye E. Thereby, as with the first embodiment and the second embodiment, it is possible to obtain a high-quality image of the fundus Ef with a strong contrast without being affected by unnecessary scattered light with a simple structure.

[0208] In particular, the shape of the opening portions 60A, 60B is set to Figure 11 the shape shown in FIG. 8, and thereby, compared with the first embodiment and the second embodiment, it is possible to increase the light quantity of the illumination light, and thereby it is possible to obtain a higher-quality image.

[0209] <Fourth Embodiment>

[0210] The structure of the ophthalmic apparatus according to the embodiments is not limited to the structure described in the embodiments. In the fourth embodiment, the optical system is configured in accordance with the Badal principle. Thereby, it is possible to fix the size of the slit image of the fundus Ef regardless of the refractive power of the examined eye E.

[0211] Hereinafter, the structure of the ophthalmic apparatus according to the fourth embodiment will be described focusing on the difference from the first embodiment.

[0212] Figure 14 An example of the structure of the ophthalmic apparatus according to the fourth embodiment is shown in FIG. 8. In Figure 14 the same portions as Figure 1 the same drawing reference numerals are attached, and the description will be appropriately omitted.

[0213] The ophthalmologic apparatus 1b according to the fourth embodiment differs from the ophthalmologic apparatus 1 according to the first embodiment mainly in that the illumination optical system 20b is provided instead of the illumination optical system 20. Further, the iris diaphragm 60 shown in Figure 14 Figure 11 but can also be applied to the configuration having the iris diaphragm 21.

[0214] The configuration of the illumination optical system 20b differs from that of the illumination optical system 20 in that the relay lens system RL1 is provided instead of the relay lens 23. That is, the relay lens system RL1 is disposed between the light scanner 30 and the slit 22, like the relay lens 23. The relay lens system RL1, the relay lenses 41, 44, and the objective lens 46 constitute a Barrell optical system.

[0215] Figure 15 A configuration example of the relay lens system RL1 according to the fourth embodiment is shown in Figure 15 In Figure 15 The relay lens system RL1 includes three lenses.

[0216] The relay lens system RL1 includes one or more lenses, like the relay lens 23. The back focal point position F1 of the relay lens system RL1 is disposed at a position optically substantially conjugate with the iris of the examined eye E.

[0217] That is, as described above, the light scanner 30 disposed at a position substantially conjugate with the iris of the examined eye E is disposed at the back focal point position F1 of the relay lens system RL1 or in the vicinity thereof. Thus, even in the case where the slit 22 is moved in the optical axis direction according to the refractive power of the examined eye E, the size of the slit image (an image formed by light passing through the opening portion of the slit 22) projected onto the fundus Ef does not change regardless of the refractive power of the examined eye E. This means that even if the slit 22 is moved in the optical axis direction, the projection magnification of the slit image on the fundus Ef does not change.

[0218] The operation of the ophthalmologic apparatus 1b according to the fourth embodiment is the same as that of the ophthalmologic apparatus 1 according to the first embodiment, and thus detailed description is omitted.

[0219] The relay lens system RL1 is an example of the "first relay lens system" according to the embodiments.

[0220] According to the fourth embodiment, by disposing the light scanner 30 at the back focal point position F1 (or in the vicinity thereof) of the relay lens system RL1, the Barrell optical system is constituted by the relay lens system RL1, the relay lenses 41, 42, and the objective lens 46. ​

[0221] Thus, the projection angle (projection magnification) of the slit image with respect to the visual axis of the eye E (the long side direction and the short side direction of the slit 22) can be fixed regardless of the refractive power of the eye E. As a result, the size of the slit image is constant regardless of the refractive power of the eye E, and thus the deflection operation speed of the light scanner 30 can be fixed, and the control of the light scanner 30 can be simplified.

[0222] In addition, the projection angle (projection magnification) of the slit image with respect to the visual axis of the eye E is fixed regardless of the refractive power of the eye E, and thus the luminance of the slit image of the fundus Ef can be fixed regardless of the refractive power of the eye E.

[0223] Further, in the case where an image is acquired at a predetermined imaging angle of view in the ophthalmic apparatus, the projection magnification is fixed as described above, and thus a margin does not need to be provided in the length of the long side direction of the slit 22 provided for acquiring a slit image of a predetermined size.

[0224] <5th Embodiment>

[0225] The ophthalmic apparatus according to the fourth embodiment can acquire an imaging image of the fundus Ef and an observation image of the fundus Ef as with the second embodiment. In this case, the light source 10 is used as an imaging light source, and another light source different from the light source 10 is used as an observation light source. The imaging image is acquired by the same rolling shutter method as in the first embodiment. The observation image is also acquired by the same rolling shutter method as the imaging image.

[0226] Hereinafter, the structure of the ophthalmic apparatus according to the fifth embodiment will be described focusing on the points of difference from the fourth embodiment.

[0227] Figure 16 The structure of the ophthalmic apparatus according to the fifth embodiment is shown in FIG. 10. In FIG. 10, the same parts as in FIG. 8 are denoted by the same reference numerals, and appropriate description will be omitted. Figure 16 In FIG. 10, the same parts as in FIG. 8 are denoted by the same reference numerals, and appropriate description will be omitted. Figure 14 In FIG. 10, the same parts as in FIG. 8 are denoted by the same reference numerals, and appropriate description will be omitted.

[0228] The structure of the ophthalmic apparatus 1c according to the fifth embodiment differs from the structure of the ophthalmic apparatus 1b according to the fourth embodiment in that the illumination optical system 20c is provided instead of the illumination optical system 20b, and the light source 10a is additionally provided.

[0229] The configuration of the illumination optical system 20c differs from that of the illumination optical system 20b in that a dichroic mirror 25 and an iris diaphragm 60a for observation are added as optical path coupling members. As in the second embodiment, the dichroic mirror 25 is disposed between the slit 22 and the iris diaphragm 60 to couple the optical path of light from the light source 10a with the optical path of light from the light source 10. The iris diaphragm 60a is disposed between the light source 10a and the dichroic mirror 25.

[0230] The light source 10a is the light source described in the second embodiment.

[0231] The iris diaphragm 60a (specifically, the opening portion) can be disposed at a position optically substantially conjugate with the iris (pupil) of the subject eye E. The iris diaphragm 60a has the same shape as the iris diaphragm 60 and is formed with one or more opening portions.

[0232] The dichroic mirror 25 is the dichroic mirror described in the second embodiment.

[0233] In the present embodiment, the image sensor 51 can detect light in the visible light region and light in the infrared region. At this time, the control section according to the fifth embodiment performs the same control on the light source 10a as on the light source 10. For example, the control section turns on the light source 10 and turns off the light source 10a when photographing the fundus Ef, and turns on the light source 10a and turns off the light source 10 when observing the fundus Ef.

[0234] In the case where the light source 10 is turned on, the visible light output from the light source 10 passes through the opening portion formed in the iris diaphragm 60, passes through the dichroic mirror 25, passes through the opening portion formed in the slit 22, and is guided to the light scanner 30 through the relay lens system RL1. The light guided to the light scanner 30 illuminates the fundus Ef as in the fourth embodiment. The returning light from the fundus Ef is guided to the image pickup device 50. That is, as in the fourth embodiment, a photographing image is acquired by the rolling shutter method.

[0235] In the case where the light source 10a is turned on, the infrared light (or near-infrared light) output from the light source 10a passes through the opening portion formed in the iris diaphragm 60a, is reflected by the dichroic mirror 25, passes through the opening portion formed in the slit 22, and is guided to the light scanner 30 through the relay lens system RL1. The light guided to the light scanner 30 illuminates the fundus Ef as in the fourth embodiment. The returning light from the fundus Ef is guided to the image pickup device 50. That is, an observation image is acquired by the same rolling shutter method as in the fourth embodiment. For example, the observation image is used for the alignment of the optical system with respect to the position of the subject eye E and the observation of the photographing site such as the fundus Ef.

[0236] The ophthalmic apparatus 1c according to the fifth embodiment operates in the same manner as the ophthalmic apparatus 1b according to the fourth embodiment, and thus detailed description is omitted.

[0237] The iris diaphragm 60a is an example of the "observation iris diaphragm" according to the embodiments.

[0238] According to the fifth embodiment, the same effect as the fourth embodiment can be obtained while acquiring an observation image.

[0239] Further, in the fifth embodiment, the optical path of the light from the observation light source and the optical path of the light from the imaging light source are coupled with respect to the position of the slit 22 on the light source 10 side, but the structure according to the embodiments is not limited thereto. The optical path of the light from the observation light source and the optical path of the light from the imaging light source can be coupled at any position from the objective lens 46 to the iris diaphragm 21. In some embodiments, it can be configured so that the light from the observation light source does not pass through the objective lens 46 but is incident into the eye through the pupil.

[0240] <Sixth Embodiment>

[0241] The structure of the ophthalmic apparatus according to the embodiments is not limited to that of the ophthalmic apparatuses according to the fourth or fifth embodiments. In the ophthalmic apparatus according to the sixth embodiment, a relay lens system is disposed between the slit 22 and the iris diaphragm 60 to improve the degree of freedom of optical design. In the following embodiments, the iris diaphragm 60 can also be the iris diaphragm 21.

[0242] Hereinafter, the structure of the ophthalmic apparatus according to the sixth embodiment will be described focusing on the points of difference from the fourth embodiment.

[0243] Figure 17 An example of the structure of the ophthalmic apparatus according to the sixth embodiment is shown in FIG. 6. In FIG. 6, the same components as those in FIG. 2 are denoted by the same reference numerals, and appropriate description is omitted. Figure 17 In FIG. 6, the same components as those in FIG. 2 are denoted by the same reference numerals, and appropriate description is omitted. Figure 14

[0244] The structure of the ophthalmic apparatus 1d according to the sixth embodiment mainly differs from that of the ophthalmic apparatus 1b according to the fourth embodiment in that the illumination optical system 20d is provided instead of the illumination optical system 20b.

[0245] The structure of the illumination optical system 20d differs from that of the illumination optical system 20b in that the relay lens system RL2 is provided. That is, the relay lens system RL2 is disposed between the slit 22 and the iris diaphragm 60.

[0246] Figure 18 An example of the structure of the relay lens system RL2 according to the sixth embodiment is shown in FIG. 7. In FIG. 7, the same components as those in FIG. 2 are denoted by the same reference numerals, and appropriate description is omitted.​ Figure 18 In the present embodiment, the iris diaphragm 60 (iris diaphragm 21), the relay lens system RL2, the slit 22, the relay lens system RL1, and the light scanner 30 are shown for ease of explanation. In addition, in the present embodiment, the relay lens system RL2 includes two lenses. Figure 18 In the present embodiment, the relay lens system RL2 includes two lenses.

[0247] As with the relay lens system RL1, the relay lens system RL2 includes one or more lenses. The iris diaphragm 60 is disposed at the front focal point position F2 of the relay lens system RL2 or in the vicinity thereof.

[0248] As described above, the iris diaphragm 60 is disposed at the front focal point position F2 of the relay lens system RL2 or in the vicinity thereof. That is, the rear focal point position Fl of the relay lens system RL1 is a position optically substantially conjugate with the iris diaphragm 60, and the iris diaphragm 60 is disposed at the front focal point position F2 of the relay lens system RL2. Thus, the projection magnification from the iris diaphragm 60 to the light scanner 30 (disposed at the rear focal point position Fl) is determined in accordance with the focal length fl of the relay lens system RL1 and the focal length f2 of the relay lens system RL2. At this time, the projection magnification is (fl / f2).

[0249] The ophthalmic apparatus according to the present embodiment needs to form an image of the iris diaphragm 60 of a predetermined size on the iris of the examined eye E. When the projection magnification from the iris of the examined eye E via the objective lens 46 to the light scanner 30 is a known projection magnification, it is sufficient to project an image of the iris diaphragm 60 of a predetermined size on the light scanner 30. At this time, the projection magnification from the iris diaphragm 60 to the light scanner 30 is determined in accordance with the focal length fl of the relay lens system RL1 and the focal length f2 of the relay lens system RL2. Thus, by changing at least one of the focal lengths fl, f2, it is possible to easily form an image of the iris diaphragm 60 of a predetermined size on the iris of the examined eye E. In some embodiments, only the focal length f2 is changed in a state where the focal length fl is fixed.

[0250] The focal length fl is the combined focal length of the relay lens system RL1. In some embodiments, the relay lens system RL1 includes a plurality of lenses having different diopters, and the focal length fl is changed by changing at least one of the lenses constituting the relay lens system RL1. In some embodiments, at least one of the lenses constituting the relay lens system RL1 is a lens whose diopter can be changed. The lens whose diopter can be changed includes a liquid crystal lens, a liquid lens, an Alvarez lens, and the like. Even in the case where the focal length fl is changed, the rear focal point position of the relay lens system RL1 is disposed at a position optically substantially conjugate with the iris of the examined eye E (pupil conjugate position).

[0251] The focal length f2 is the composite focal length of the relay lens system RL2. In some embodiments, the relay lens system RL2 includes a plurality of lenses having different diopters, and the focal length f2 is changed by changing at least one of the lenses constituting the relay lens system RL2. In some embodiments, at least one of the lenses constituting the relay lens system RL2 is a lens whose diopter can be changed. Even when the focal length f2 is changed, the front focal point position of the relay lens system RL2 is configured at a position optically substantially conjugate with the iris of the examined eye E (pupil conjugate position).

[0252] In addition, in order to take an image of the fundus Ef, a light source that emits light with high luminance is desired. However, the size of the light emitting surface (light emitting area, output beam cross-sectional size) of a light source that can be generally obtained (mass-produced light source) is limited, and it is necessary to project the image of the iris diaphragm 60 onto the light scanner 30 at a projection magnification corresponding to the size of the light emitting surface of the light source.

[0253] According to the present embodiment, by changing at least one of the focal lengths f1, f2, it is possible to change the projection magnification from the iris diaphragm 60 to the light scanner 30, and thus it is possible to project the image of the iris diaphragm 60 of an arbitrary size onto the light scanner 30 at a desired size. Thereby, even when the size of the light emitting surface of the light source is different, by changing at least one of the focal lengths f1, f2, it is possible to project the image of the iris diaphragm 60 of a desired size onto the light scanner 30, thereby improving the design freedom of the optical system. In particular, by fixing the focal length f1 and changing only the focal length f2, it is possible to fix the amount of movement of the slit 22 with respect to the change in diopter of the examined eye E (movement sensitivity of the slit 22 with respect to the change in diopter), and thus it is possible to further improve the design freedom of the optical system.

[0254] The operation of the ophthalmic apparatus 1d according to the sixth embodiment is the same as that of the ophthalmic apparatus 1b according to the fourth embodiment, and thus detailed description is omitted.

[0255] The relay lens system RL2 is an example of the "second relay lens system" according to the embodiments.

[0256] According to the sixth embodiment, it is possible to reduce the effective diameter of one or more lenses constituting the relay lens system RL1.

[0257] The reason is that the slit 22 disposed at a position optically substantially conjugate with the fundus Ef of the eye E under examination is disposed between the optical scanner 30 and the iris diaphragm 60. The slit 22 is movable in the optical axis direction according to the refractive power of the eye E under examination. Here, the projection magnification from the iris diaphragm 60 to the optical scanner 30 is determined according to the first distance of the optical scanner 30 from the relay lens system RL1 and the second distance of the iris diaphragm 60 from the relay lens system RL1, and thus when the first distance is shortened, the second distance also needs to be shortened. However, since it is necessary to maintain the conjugate relationship with the iris and the conjugate relationship with the fundus Ef while securing the movement space of the slit 22 in the optical axis direction, the first distance becomes longer and the effective diameter of the relay lens system RL1 becomes larger. According to the present embodiment, by providing the relay lens system RL2, even if the first distance is shortened, the relay lens system RL2 can be used to adjust the projection magnification. Thus, it is possible to shorten the first distance while securing the movement space of the slit 22 in the optical axis direction and maintaining the conjugate relationship with the iris and the conjugate relationship with the fundus Ef, and thus it is possible to reduce the effective diameter of the one or more lenses constituting the relay lens system RL1.

[0258] In addition, the effective diameter of the one or more lenses constituting the relay lens system RL1 can be reduced, and thus the length of the optical system from the optical scanner 30 to the light source 10 can be reduced.

[0259] <Modification of the Sixth Embodiment>

[0260] In the sixth embodiment, at least one of the focal distance fl and the focal distance f2 can be changed according to the kind of the light source 10. The ophthalmic apparatus according to the modification of the sixth embodiment can change at least one of the focal distance fl and the focal distance f2 according to the size of the light emitting surface (light emitting area, output beam cross-sectional size) of the light source 10.

[0261] For example, the relay lens system RL1 changes the focal distance fl according to the size of the light emitting surface of the light source 10, similarly to the sixth embodiment. For example, the relay lens system RL2 changes the focal distance f2 according to the size of the light emitting surface of the light source 10, similarly to the sixth embodiment.

[0262] In some embodiments, the main control section 101 controls the relay lens system RL1 (or the lens capable of changing the refractive power) according to the size of the light emitting surface of the light source 10 specified by the operation section 110, thereby changing the focal distance fl. In some embodiments, the main control section 101 controls the relay lens system RL2 (or the lens capable of changing the refractive power) according to the size of the light emitting surface of the light source 10 specified by the operation section 110, thereby changing the focal distance f2.

[0263] <Seventh Embodiment>

[0264] As with the second embodiment or the fifth embodiment, the ophthalmic apparatus according to the sixth embodiment or a modification thereof is capable of acquiring a captured image of the fundus Ef and an observed image of the fundus Ef. In this case, the light source 10 serves as a light source for capturing, and another light source different from the light source 10 serves as a light source for observation. The captured image is acquired by the same rolling shutter method as in the first embodiment. The observed image is also acquired by the same rolling shutter method as in the captured image.

[0265] Hereinafter, the structure of the ophthalmic apparatus according to the seventh embodiment will be described focusing on the points of difference from the sixth embodiment.

[0266] Figure 19 The structure of the ophthalmic apparatus according to the seventh embodiment is shown in FIG. 17. In Figure 19 The same components as in the Figure 16 or Figure 17 will be assigned the same reference numerals, and the description will be omitted as appropriate.

[0267] The structure of the ophthalmic apparatus 1e according to the seventh embodiment differs from that of the ophthalmic apparatus 1d according to the sixth embodiment in that the illumination optical system 20e is provided instead of the illumination optical system 20d, and the light source 10a is additionally provided.

[0268] The structure of the illumination optical system 20e differs from that of the illumination optical system 20d in that the dichroic mirror 25 as a light path coupling member and the iris diaphragm 60a for observation are additionally provided. As with the sixth embodiment, the dichroic mirror 25 is disposed between the slit 22 and the iris diaphragm 60, and couples the light path of the light from the light source 10a with the light path of the light from the light source 10. The iris diaphragm 60a is disposed between the light source 10a and the dichroic mirror 25.

[0269] The light source 10a is the light source described in the second embodiment (the fifth embodiment).

[0270] The iris diaphragm 60a (specifically, the opening portion) can be disposed at a position optically substantially conjugate with the iris (pupil) of the eye E under examination. The iris diaphragm 60a has the same shape as the iris diaphragm 60, and is formed with one or more opening portions.

[0271] The dichroic mirror 25 is the dichroic mirror described in the second embodiment (the fifth embodiment).

[0272] In the present embodiment, the image sensor 51 is capable of detecting light in the visible light region and light in the infrared region. At this time, the control section according to the seventh embodiment performs the same control on the light source 10a as on the light source 10. For example, the control section turns on the light source 10 and turns off the light source 10a when capturing the fundus Ef, and turns on the light source 10a and turns off the light source 10 when observing the fundus Ef.

[0273] In the case where the light source 10 is lit, the visible light output from the light source 10 is guided to the light scanner 30 through the opening portion formed in the iris diaphragm 60, the dichroic mirror 25, the opening portion formed in the slit 22, and the relay lens system RL1. The light guided to the light scanner 30 illuminates the fundus Ef as in the fifth embodiment. The return light from the fundus Ef illuminated by the light is guided to the imaging device 50. That is, as in the sixth embodiment, the observation image is acquired by the rolling shutter method.

[0274] In the case where the light source 10a is lit, the visible light output from the light source 10a is guided to the light scanner 30 through the opening portion formed in the iris diaphragm 21a, the reflection by the dichroic mirror 25, the opening portion formed in the slit 22, and the relay lens system RL1. The light guided to the light scanner 30 illuminates the fundus Ef as in the fifth embodiment. The return light from the fundus Ef illuminated by the light is guided to the imaging device 50. That is, the observation image is acquired by the rolling shutter method as in the sixth embodiment. The observation image is used for, for example, the position alignment of the optical system with respect to the subject eye E and the observation of the photographing site of the fundus Ef and the like.

[0275] The operation of the ophthalmic apparatus 1e according to the seventh embodiment is the same as that of the ophthalmic apparatus 1d according to the sixth embodiment, and thus the detailed description is omitted.

[0276] According to the seventh embodiment, the same effect as that of the sixth embodiment can be obtained while the observation image is acquired.

[0277] Further, in the seventh embodiment, the optical path of the light from the observation light source and the optical path of the light from the imaging light source are coupled with respect to the position of the slit 22 on the light source 10 side, but the structure according to the embodiments is not limited thereto. The optical path of the light from the observation light source and the optical path of the light from the imaging light source can be coupled at any position from the objective lens 46 to the iris diaphragm 21. In some embodiments, the light from the observation light source is configured to pass through the pupil without passing through the objective lens 46 and be incident into the eye.

[0278] [Effects]

[0279] The effects of the ophthalmic apparatus and the control method thereof according to the embodiments are described.

[0280] An ophthalmologic apparatus (1, 1a, 1b, 1c, 1d, 1e) according to some embodiments includes a light source (10), an illumination optical system (20), a light scanner (30), a photographing optical system (40), and a control section (100, main control section 101). The illumination optical system generates slit-shaped illumination light by using light from the light source. The light scanner deflects the illumination light and guides it to a fundus (Ef) of an eye (E) under examination. The photographing optical system guides return light of the illumination light from the fundus to an image sensor (51). The control section controls the image sensor by a rolling shutter method so that a light-receiving result of the return light corresponding to an irradiation position of the illumination light in the fundus is acquired. The illumination optical system includes a slit (22) formed with a slit-shaped opening portion capable of being disposed at a position optically substantially conjugate with the fundus, an iris diaphragm (21) disposed between the light source and the slit and capable of being disposed at a position optically substantially conjugate with an iris of the eye under examination, and an optical element (24) disposed between the light source and the iris diaphragm and deflecting light from the light source.

[0281] According to this structure, light from the light source that passes through the iris diaphragm can be deflected by the optical element and guided to the opening portion formed in the slit. Thus, light from the light source can be efficiently incident on the eye under examination with pupil division. Therefore, even in the case of using a cheap light source with a wide angle, the illuminance required for photographing the fundus can be ensured with a simple structure, and a high-quality image of the eye under examination can be acquired without being affected by the state of the eye under examination.

[0282] An ophthalmologic apparatus (1, 1a, 1b, 1c, 1d, 1e) according to some embodiments includes a light source (10), an illumination optical system (20), a first moving mechanism (moving mechanism 22D), a light scanner (30), a photographing optical system (40), and a control section (100, main control section 101). The illumination optical system includes a slit (22) formed with a slit-shaped opening portion capable of being disposed at a position optically substantially conjugate with a fundus (Ef) of an eye (E) under examination and generates slit-shaped illumination light by using light from the light source. The first moving mechanism moves the slit in an optical axis direction of the illumination optical system. The light scanner deflects the illumination light and guides it to the fundus of the eye under examination. The photographing optical system guides return light of the illumination light from the fundus to an image sensor (51). The control section controls the image sensor by a rolling shutter method so that a light-receiving result of the return light corresponding to an irradiation position of the illumination light in the fundus is acquired. The control section controls the first moving mechanism based on a refractive power of the eye under examination.

[0283] According to this configuration, the position of the slit disposed at a position optically substantially conjugate with the fundus of the eye under examination is moved in accordance with the refractive power of the eye under examination, and thus light from the light source can be efficiently guided to the fundus of the eye under examination. As a result, light from the light source can be efficiently incident on the eye under examination in pupil division. Thus, even when a wide-angle, inexpensive light source is used, the illuminance required for photographing the fundus can be ensured with a simple configuration, and a high-quality image of the eye under examination can be acquired without being affected by the state of the eye under examination.

[0284] The ophthalmologic apparatus according to some embodiments includes a second moving mechanism (moving mechanism 10D) that changes at least one of the position and the orientation of the light source, and the control section controls the second moving mechanism in accordance with the position of the slit moved by the first moving mechanism.

[0285] According to this configuration, even when the positional relationship between the light source and the slit is changed in accordance with the refractive power of the eye under examination, the distribution of the amount of light in the direction of the opening portion connecting the light source and the slit can be changed. As a result, the fundus can be illuminated with the desired illuminance without being affected by the refractive power of the eye under examination.

[0286] In the ophthalmologic apparatus according to some embodiments, the illumination optical system includes an iris diaphragm (21, 60) disposed between the light source and the slit and capable of being disposed at a position optically substantially conjugate with the iris of the eye under examination, and the control section controls the second moving mechanism so that the light passing through the iris diaphragm passes through the opening portion.

[0287] According to this configuration, even when the positional relationship between the light source and the iris diaphragm and the slit is changed in accordance with the refractive power of the eye under examination, the passage of the light passing through the opening portion of the slit through the iris diaphragm irradiating light from the light source can be adjusted. As a result, the fundus can be illuminated with the desired illuminance without being affected by the refractive power of the eye under examination.

[0288] In the ophthalmologic apparatus according to some embodiments, the illumination optical system includes a first relay lens system (relay lens system RL1) disposed between the light scanner and the slit, and the back focal point position (F1) of the first relay lens system is a position optically substantially conjugate with the iris.

[0289] According to this configuration, the optical system from the first relay lens system to the iris of the examined eye can be configured in accordance with the principle of the Barat. Thereby, even if the slit moves in the optical axis direction according to the refractive power of the examined eye, the size of the slit image projected to the fundus is constant regardless of the refractive power of the examined eye. This means that even if the slit moves in the optical axis direction, the projection magnification of the slit image to the fundus is constant. As a result, the deflection operation speed of the light scanner can be fixed regardless of the refractive power of the examined eye, and thus the control of the light scanner can be simplified. In addition, the projection visual angle (projection magnification) of the slit image with respect to the visual axis of the examined eye is fixed regardless of the refractive power of the examined eye, and thus the illumination of the slit image on the fundus can be fixed regardless of the refractive power of the examined eye. Also, in the case where the image is acquired in the ophthalmic apparatus at a predetermined imaging visual angle, the projection magnification is fixed, and thus a margin does not need to be provided in the length of the long side direction of the slit.

[0290] In some embodiments, the light scanner is disposed at or near the back focal point position.

[0291] According to this configuration, the deflection operation speed of the light scanner can be fixed regardless of the refractive power of the examined eye while miniaturizing the size of the optical system, and thus the control of the light scanner can be simplified.

[0292] Some embodiments relate to an ophthalmic apparatus including: an observation light source (light source 10a); a light path coupling member (dichroic mirror 25) disposed between the first relay lens system and the iris diaphragm and coupling the light path of the light output from the light source and the light path of the light output from the observation light source; and an observation iris diaphragm (iris diaphragm 60a) disposed between the observation light source and the light path coupling member.

[0293] According to this configuration, the observation image can be acquired while ensuring the illumination required for photographing the fundus in a simple configuration, and a high-quality image of the examined eye can be acquired regardless of the state of the examined eye.

[0294] Some embodiments relate to an ophthalmic apparatus including: a second relay lens system (relay lens system RL2) disposed between the slit and the iris diaphragm, the iris diaphragm being disposed at or near the front focal point position of the second relay lens system.

[0295] According to this configuration, by changing at least one of the focal length of the first lens and the focal length of the second lens, the projection magnification from the iris diaphragm to the light scanner can be changed, and thus the image of the iris diaphragm of an arbitrary size can be projected onto the light scanner at a desired size. Thereby, even if the size of the light emitting surface of the light source is different, the image of the iris diaphragm of the desired size can be projected onto the light scanner, and thus the design freedom of the optical system can be improved.

[0296] In some embodiments, at least one of the refractive power of the first lens and the refractive power of the second lens is changed according to the size of the light emitting surface of the light source.

[0297] According to this configuration, an image of an iris diaphragm of an arbitrary size can be projected on the light scanner in a desired size. Thus, even in the case where the size of the light emitting surface of the light source is different, an image of an iris diaphragm of a desired size can be projected on the light scanner, thereby improving the design freedom of the optical system.

[0298] In some embodiments, at least one of the refractive power of the first lens and the refractive power of the second lens is changed according to the size of the light emitting surface of the light source.

[0299] According to this configuration, the size of the light emitting surface of the light source is not limited, and a high-quality image of the examined eye can be obtained at low cost.

[0300] An ophthalmic apparatus according to some embodiments includes: an observation light source (light source 10a); a light path coupling member (dichroic mirror 25) disposed between a second relay lens system and an iris diaphragm and coupling a light path of light output from the light source and a light path of light output from the observation light source; and an observation iris diaphragm (iris diaphragm 60a) disposed between the observation light source and the light path coupling member.

[0301] According to this configuration, an observation image can be obtained while ensuring the necessary illuminance for photographing the fundus in a simple configuration, and a high-quality image of the examined eye can be obtained without being affected by the state of the examined eye.

[0302] In an ophthalmic apparatus according to some embodiments, one or more opening portions through which illumination light passes are formed on the iris diaphragm in such a manner that the light beam cross section of the illumination light and the light beam cross section of the return light from the examined eye are separated on the cornea, the anterior surface of the lens, and the posterior surface of the lens of the examined eye.

[0303] According to this configuration, by high-precision pupil division of the illumination light incident on the examined eye and the return light from the examined eye, the necessary illuminance for photographing the fundus can be ensured in a simple configuration, and a high-quality image of the examined eye can be obtained without being affected by the state of the examined eye.

[0304] In an ophthalmic apparatus according to some embodiments, two or more opening portions are formed on the iris diaphragm, and the two or more opening portions are formed to be linearly symmetrical with respect to a straight line extending in a direction corresponding to the long side direction of the opening portion formed in the slit with respect to the optical axis of the illumination optical system.

[0305] According to this configuration, the illumination light incident on the eye to be examined from different directions of the fundus and the return light from the eye to be examined can be pupil-divided with high precision.

[0306] In the ophthalmologic apparatus according to some embodiments, the opening portion has an arcuate shape, and a direction of a chord of the arcuate shape is substantially parallel to a direction corresponding to a long side direction of the opening portion of the slit.

[0307] According to this configuration, the amount of light of the illumination light can be increased with a simple configuration, and a high-quality image of the fundus with higher contrast can be obtained.

[0308] In the ophthalmologic apparatus according to some embodiments, the illumination optical system includes an optical element (24) disposed between the light source and the iris diaphragm and deflecting the light from the light source.

[0309] According to this configuration, the light from the light source that passes through the iris diaphragm is deflected by the optical element, and can be guided to the opening portion of the slit. Thus, the light from the light source can be efficiently pupil-divided and incident on the eye to be examined. Therefore, even when a wide-angle inexpensive light source is used, the necessary illuminance for photographing the fundus can be ensured with a simple configuration.

[0310] In the ophthalmologic apparatus according to some embodiments, the optical element deflects the light from the light source in a manner that maximizes the light amount distribution in a direction connecting the iris diaphragm and the opening portion.

[0311] According to this configuration, even when an inexpensive light source is used, the fundus can be illuminated with a desired illuminance with a simple configuration.

[0312] The ophthalmologic apparatus according to some embodiments includes a third moving mechanism that changes at least one of the position and the orientation of the optical element, and the control section controls the third moving mechanism.

[0313] According to this configuration, since at least one of the position and the orientation of the optical element is deflected, the light amount distribution in the direction connecting the iris diaphragm and the opening portion of the slit can be adjusted. Thus, even when the positional relationship between the light source and the iris diaphragm and the slit is changed, the light amount distribution in the direction connecting the iris diaphragm and the opening portion can be adjusted.

[0314] In the ophthalmologic apparatus according to some embodiments, the optical element includes a prism, a microlens array, or a Fresnel lens.

[0315] According to this configuration, the light from the light source can be efficiently pupil-divided and incident on the eye to be examined at a low cost. Therefore, the necessary illuminance for photographing the fundus can be ensured with a simple configuration.

[0316] The control method of the ophthalmic apparatus (1, 1a, 1b, 1c, 1d, 1e) according to some embodiments includes an ophthalmic apparatus including a light source (10), an illumination optical system (20), a first moving mechanism (moving mechanism 22D), a light scanner (30), a photographing optical system (40), and a control section (100, main control section 101). The illumination optical system includes a slit (22) formed with a slit-shaped opening portion capable of being disposed at a position optically substantially conjugate with a fundus (Ef) of an eye (E) to be examined and generates slit-shaped illumination light by using light from the light source. The first moving mechanism moves the slit in an optical axis direction of the illumination optical system. The light scanner deflects the illumination light and guides the illumination light to the fundus of the eye to be examined. The photographing optical system guides return light of the illumination light from the fundus to an image sensor (51). The control section controls the image sensor by a rolling shutter method so that a light-receiving result of the return light corresponding to an irradiation position of the illumination light in the fundus is acquired. The control method of the ophthalmic apparatus includes an acquisition step of acquiring a refractive power of the eye to be examined and a first control step of controlling the first moving mechanism based on the refractive power acquired in the acquisition step.

[0317] According to this method, the position of the slit disposed at a position optically substantially conjugate with the fundus of the eye to be examined is moved according to the refractive power of the eye to be examined, so that light from the light source can be efficiently guided to the fundus of the eye to be examined. Thus, light from the light source can be efficiently pupil-dividedly incident on the eye to be examined. Therefore, even in the case where a wide-angle inexpensive light source is used, the illuminance required for photographing the fundus can be ensured with a simple structure, and a high-quality image of the eye to be examined can be acquired without being affected by the state of the eye to be examined.

[0318] In the control method of the ophthalmic apparatus according to some embodiments, the ophthalmic apparatus includes a second moving mechanism (moving mechanism 10D) that changes at least one of the position and the orientation of the light source, and the control method of the ophthalmic apparatus includes a second control step of controlling the second moving mechanism according to the position of the slit moved by the first moving mechanism.

[0319] According to this method, even in the case where the positional relationship between the light source and the slit is changed according to the refractive power of the eye to be examined, the light amount distribution in the direction connecting the light source and the opening portion of the slit can be changed. Thus, the fundus can be illuminated with a desired illuminance without being affected by the refractive power of the eye to be examined.

[0320] In the control method of the ophthalmic apparatus according to some embodiments, the illumination optical system includes an iris diaphragm (21, 60) disposed between the light source and the slit and capable of being disposed at a position optically substantially conjugate with an iris of the eye to be examined, and in the second control step, the second moving mechanism is controlled so that the light passing through the opening portion of the iris diaphragm.

[0321] According to this method, even if the positional relationship of the light source with the iris diaphragm and the position of the slit is changed depending on the refractive power of the eye to be examined, it is possible to adjust the amount of light passing through the opening of the slit from the iris diaphragm by irradiating light from the light source. Thus, the fundus can be illuminated with the desired illuminance without being affected by the refractive power of the eye to be examined.

[0322] In the control method of the ophthalmic apparatus according to some embodiments, the illumination optical system includes an optical element (24) disposed between the light source and the iris diaphragm and deflecting light from the light source, and the ophthalmic apparatus includes a third moving mechanism that changes at least one of the position and the orientation of the optical element. The control method of the ophthalmic control apparatus includes a third control step. The third moving mechanism is controlled.

[0323] According to this method, since at least one of the position and the orientation of the optical element is deflected, it is possible to adjust the distribution of the amount of light in the direction connecting the iris diaphragm and the opening of the slit. Thus, even if the positional relationship of the light source with the iris diaphragm and the position of the slit is changed, it is possible to adjust the distribution of the amount of light in the direction connecting the iris diaphragm and the opening.

[0324] In the control method of the ophthalmic apparatus according to some embodiments, the optical element includes a prism, a microlens array, or a Fresnel lens.

[0325] According to this method, it is possible to efficiently pupil-divide light from the light source into the eye to be examined at low cost. Thus, it is possible to ensure the illuminance required for photographing the fundus with a simple structure.

[0326] The embodiments described above or modifications thereof are merely one example for implementing the present application. A person who implements the present application can implement any modifications, omissions, additions, and the like within the scope of the present application.

[0327] In the embodiments, the ophthalmic apparatus can have any function that can be used in the field of ophthalmology, such as an axial length measurement function, an intraocular pressure measurement function, an optical coherence tomography (OCT) function, an ultrasonic examination function, and the like. Further, the axial length measurement function is realized by an optical coherence tomograph or the like. In addition, in the axial length measurement function, light can be projected to the eye to be examined, the position of the optical system in the Z direction (front-rear direction) with respect to the eye to be examined can be adjusted, and the returning light from the fundus can be detected, whereby the axial length of the eye to be examined can be measured. The intraocular pressure measurement function is realized by a tonometer or the like. The OCT function is realized by an optical coherence tomograph or the like. The ultrasonic examination function is realized by an ultrasonic diagnostic apparatus or the like. In addition, the present application can be applied to an apparatus (a compound machine) having two or more of such functions.

[0328] In some embodiments, a program for causing a computer to execute the control method of the ophthalmic apparatus is provided. Such a program can be stored in a non-transitory arbitrary recording medium that is readable by a computer. As the recording medium, for example, a semiconductor memory, an optical disk, a magneto-optical disk (CD-ROM / DVD-RAM / DVD-ROM / MO, etc.), a magnetic storage medium (a hard disk, a floppy (registered trademark) disk, a ZIP, etc.), or the like can be used. In addition, the program can also be transmitted and received through a network such as the Internet, a LAN, or the like.

[0329] The structures described in the first to seventh embodiments and the modification example of the sixth embodiment can be arbitrarily combined.

[0330] (Explanation of Reference Numerals)

[0331] 1, 1a, 1b, 1c, 1d, 1e: ophthalmic apparatus

[0332] 10, 10a: light source

[0333] 20, 20a, 20b, 20c, 20d, 20e: illumination optical system

[0334] 21, 21a, 60, 60a: iris diaphragm

[0335] 22: slit

[0336] 23, 41, 44, 48: relay lens

[0337] 25: dichroic mirror

[0338] 30: light scanner

[0339] 35: projection optical system

[0340] 40: imaging optical system

[0341] 42: black point plate

[0342] 43: mirror

[0343] 45: pinhole mirror

[0344] 46: objective lens

[0345] 47: focusing lens

[0346] 49: imaging lens

[0347] 50: image pickup device

[0348] 51: image sensor

[0349] E: eye to be examined

[0350] Ef: fundus

[0351] RL1, RL2: relay lens system

Claims

1. An ophthalmic device comprising: light source; An illumination optical system includes a slit having a slit-shaped opening that can be positioned optically conjugate to the fundus of the eye being examined, an iris aperture positioned between the light source and the slit and positioned optically conjugate to the iris of the eye being examined, and an optical element positioned between the light source and the iris aperture that deflects light from the light source, and generates slit-shaped illumination light by using light from the light source; A first moving mechanism moves the slit along the optical axis of the illumination optical system. A light scanner deflects and guides the illumination light to the fundus; The imaging optical system guides the reflected light from the illumination light from the fundus to the image sensor; The control unit controls the image sensor via a rolling shutter to acquire the light reception result of the returned light corresponding to the illumination position of the illumination light in the fundus; as well as The third moving mechanism changes at least one of the position and orientation of the optical element. The control unit controls the first moving mechanism and the third moving mechanism based on the refractive power of the examined eye.

2. The ophthalmic device according to claim 1, characterized in that, The ophthalmic device includes: a second moving mechanism for changing at least one of the position and orientation of the light source. The control unit controls the second moving mechanism based on the position of the crack moved by the first moving mechanism.

3. The ophthalmic device according to claim 2, characterized in that, The control unit controls the second moving mechanism so that light passing through the iris aperture passes through the opening.

4. The ophthalmic device according to claim 1, characterized in that, The illumination optical system includes: a first relay lens system disposed between the optical scanner and the slit. The rear focal position of the first relay lens system is approximately conjugate to the optical position of the iris.

5. The ophthalmic device according to claim 4, characterized in that, The light scanner is positioned at or near the rear focal position.

6. The ophthalmic device according to claim 4, characterized in that, The ophthalmic device includes: Light source for observation; An optical path coupling component is disposed between the first relay lens system and the iris aperture, and couples the optical path of light output from the light source with the optical path of light output from the observation light source; and An iris aperture for observation is positioned between the observation light source and the optical path coupling component.

7. The ophthalmic device according to claim 4, characterized in that, The ophthalmic device includes a second relay lens system disposed between the slit and the iris aperture. The iris aperture is disposed at or near the front focal position of the second relay lens system.

8. The ophthalmic device according to claim 7, characterized in that, The ophthalmic device includes: Light source for observation; An optical path coupling component is disposed between the second relay lens system and the iris aperture, and couples the optical path of light output from the light source with the optical path of light output from the observation light source; and An iris aperture for observation is positioned between the observation light source and the optical path coupling component.

9. The ophthalmic device according to claim 1, characterized in that, The iris aperture has one or more openings for the illumination light to pass through, such that the beam cross-section of the illumination light at the cornea, anterior surface of the lens, and posterior surface of the examined eye is separated from the beam cross-section of the returning light from the examined eye.

10. The ophthalmic device according to claim 9, characterized in that, Two or more openings are formed on the iris aperture. The two or more openings are formed as straight lines that extend symmetrically with respect to the optical axis of the illumination optical system in a direction corresponding to the long side direction of the opening formed in the slit.

11. The ophthalmic device according to claim 9 or 10, characterized in that, The opening is in the shape of an arc. The direction of the bow-shaped chord is approximately parallel to the direction corresponding to the long side of the opening formed in the rift.

12. The ophthalmic device according to claim 1, characterized in that, The optical element deflects the light from the light source in a manner that maximizes the light distribution in the direction connecting the iris aperture and the opening.

13. The ophthalmic device according to claim 1, characterized in that, The optical elements include prisms, microlens arrays, or Fresnel lenses.

14. A method for controlling an ophthalmic device, the ophthalmic device comprising: light source; An illumination optical system includes a slit having a slit-shaped opening that can be positioned optically conjugate to the fundus of the eye being examined, an iris aperture positioned between the light source and the slit and positioned optically conjugate to the iris of the eye being examined, and an optical element positioned between the light source and the iris aperture that deflects light from the light source, and generates slit-shaped illumination light by using light from the light source; A first moving mechanism moves the slit along the optical axis of the illumination optical system. A light scanner deflects and guides the illumination light to the fundus; The imaging optical system guides the reflected light from the illumination light from the fundus to the image sensor; as well as The control unit controls the image sensor via a rolling shutter to acquire the light reception result of the returned light corresponding to the illumination position of the illumination light in the fundus; as well as The third moving mechanism changes at least one of the position and orientation of the optical element. The control method for the ophthalmic device includes: The acquisition step involves acquiring the refractive power of the examined eye; and The first control step involves controlling the first moving mechanism based on the refractive power obtained in the acquisition step. The steps of controlling the third moving mechanism to allow light passing through the iris aperture to pass through the opening; and The third control step involves controlling the third moving mechanism.

15. The control method for the ophthalmic device according to claim 14, characterized in that, The ophthalmic device includes: a second moving mechanism for changing at least one of the position and orientation of the light source. The control method of the ophthalmic device includes a second control step of controlling the second moving mechanism according to the position of the slit moved by the first moving mechanism.

16. The control method for the ophthalmic device according to claim 14 or 15, characterized in that, The optical elements include prisms, microlens arrays, or Fresnel lenses.

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