Ophthalmic device, control method thereof, and recording medium

Abstract

An ophthalmic apparatus includes a light source, an illumination optical system, a light scanner, an imaging optical system, and a control unit. The illumination optical system generates slit-shaped illumination light using the light from the light source. The light scanner deflects the illumination light and guides the illumination light to the fundus of an eye to be examined. The imaging optical system guides the return light of the illumination light from the fundus to an image sensor, and the image sensor acquires the light reception result of a region of a light reception surface corresponding to an illumination region of the illumination light in the fundus moved by the light scanner in a rolling shutter manner. The control unit controls the deflection angle of the illumination light by the light scanner. The light scanner outputs a scanner position signal corresponding to the deflection angle of the illumination light. The image sensor starts acquiring the light reception result of the return light in synchronization with the scanner position signal.

Description

Technical Field

[0001] The present invention relates to an ophthalmic device, a control method thereof, and a recording medium. Background Art

[0002] In recent years, screening using an ophthalmic device has been carried out. Such an ophthalmic device is also expected to be applied to self-examination, and further miniaturization and weight reduction are desired.

[0003] For example, Patent Document 1 and Patent Document 2 disclose an ophthalmic device configured to perform pattern illumination on an eye to be examined using slit light and detect the returned light using a CMOS (complementary metal oxide semiconductor) image sensor. By adjusting the illumination mode and the light reception timing of the CMOS image sensor, this ophthalmic device can acquire an image of the eye to be examined with a simple structure.

[0004] Patent Document 1: US Patent No. 7,831,106 Specification

[0005] Patent Document 2: US Patent No. 8,237,835 Specification Summary of the Invention

[0006] In such an ophthalmic device, by receiving and acquiring the returned light of the illumination light at an appropriate timing in the CMOS image sensor, the influence of unnecessary scattered light can be eliminated, and the image quality of the acquired image of the eye to be examined can be improved.

[0007] However, in the conventional method, it is not possible to synchronize the control on the illumination side and the control on the light reception side with high precision. Therefore, it is necessary to consider the time delay between the control on the illumination side and the control on the light reception side to receive and acquire the returned light, and unnecessary scattered light is still received. As a result, there is a problem that the image quality of the acquired image of the eye to be examined is reduced.

[0008] In view of this situation, the present invention has been proposed, and one of its purposes is to provide a new technique for obtaining a high-quality image of an eye to be examined with a simple structure.

[0009] A first aspect of some embodiments provides an ophthalmic device including: a light source; an illumination optical system that generates slit-shaped illumination light using light from the light source; a light scanner that deflects the illumination light and guides the illumination light to the fundus of an eye to be examined; an imaging optical system that guides return light of the illumination light from the fundus to an image sensor, the image sensor acquiring a light reception result of a region of a light reception surface corresponding to an illumination region of the illumination light in the fundus that moves by the light scanner in a rolling shutter manner; and a control unit that controls a deflection angle of the illumination light by the light scanner, the light scanner outputting a scanner position signal corresponding to the deflection angle of the illumination light, and the image sensor starting to acquire the light reception result of the return light in synchronization with the scanner position signal.

[0010] A second aspect of some embodiments is based on the first aspect, wherein the ophthalmic device includes: a first voltage detection circuit that changes a trigger signal according to a comparison result between the scanner position signal and a first threshold voltage, and the image sensor starts to acquire the light reception result in synchronization with a change in the trigger signal.

[0011] A third aspect of some embodiments is based on the first aspect or the second aspect, wherein the control unit outputs a scanner control signal to the light scanner and deflects the illumination light at a deflection angle corresponding to the scanner control signal.

[0012] A fourth aspect of some embodiments is based on any one of the first aspect to the third aspect, wherein the light source is switched from an on state to an off state or from an off state to an on state in synchronization with the scanner position signal.

[0013] A fifth aspect of some embodiments is based on the fourth aspect, wherein the ophthalmic device includes: a second voltage detection circuit that changes a light source control signal for controlling turning on and off of the light source according to a comparison result between the scanner position signal and a second threshold voltage, and the light source is switched from an on state to an off state or from an off state to an on state in synchronization with a change in the light source control signal.

[0014] A sixth aspect of some embodiments is based on the fifth aspect, wherein the image sensor starts and ends acquiring the light reception result during a period when the light source is in an on state.

[0015] A seventh aspect of some embodiments is based on any one of the first aspect to the sixth aspect, wherein the image sensor is a CMOS image sensor.

[0016] The eighth aspect of some embodiments provides a control method for an ophthalmic device, the ophthalmic device including: a light source; an illumination optical system that generates slit-shaped illumination light using light from the light source; a light scanner that deflects the illumination light and guides the illumination light to the fundus of an eye to be examined; an imaging optical system that guides the return light of the illumination light from the fundus to an image sensor, the image sensor acquiring, in a rolling shutter manner, a light reception result of a region of a light reception surface corresponding to an illumination region of the illumination light in the fundus that moves through the light scanner; and a control unit that controls a deflection angle of the illumination light by the light scanner. The control method for the ophthalmic device includes: a first output step in which the light scanner outputs a scanner position signal corresponding to the deflection angle of the illumination light; and a light reception result acquisition step in which the image sensor starts acquiring the light reception result of the return light synchronously with the scanner position signal.

[0017] The ninth aspect of some embodiments is based on the eighth aspect, wherein the control method for the ophthalmic device includes: a first voltage detection step of changing a trigger signal based on a comparison result between the scanner position signal and a first threshold voltage, and in the light reception result acquisition step, the image sensor starts acquiring the light reception result synchronously with a change in the trigger signal.

[0018] The tenth aspect of some embodiments is based on the eighth aspect or the ninth aspect, wherein the control method for the ophthalmic device includes: a second output step in which the control unit outputs a scanner control signal to the light scanner, and the light scanner deflects the illumination light at a deflection angle corresponding to the scanner control signal.

[0019] The eleventh aspect of some embodiments is based on any one of the eighth aspect to the tenth aspect, wherein the control method for the ophthalmic device includes: a light source control step of switching the light source from an on state to an off state or from an off state to an on state synchronously with the scanner position signal.

[0020] The twelfth aspect of some embodiments is based on the eleventh aspect, wherein the control method for the ophthalmic device includes: a second voltage detection step of changing a light source control signal for controlling turning on and off of the light source based on a comparison result between the scanner position signal and a second threshold voltage, and in the light source control step, switching the light source from an on state to an off state or from an off state to an on state synchronously with a change in the light source control signal.

[0021] The thirteenth aspect of some embodiments is based on the twelfth aspect, wherein in the light reception result acquisition step, the image sensor starts and ends acquiring the light reception result during a period when the light source is in an on state.

[0022] The fourteenth mode of some embodiments is based on any one of the eighth mode to the thirteenth mode, wherein the image sensor is a CMOS image sensor.

[0023] The fifteenth mode of some embodiments relates to a recording medium in which a program is stored, and the program causes a computer to execute each step of the control method of the ophthalmic device according to any one of the eighth mode to the fourteenth mode.

[0024] In addition, the structures according to the above-described multiple modes can be arbitrarily combined.

[0025] According to the present invention, a new technology for obtaining a high-quality image of an eye to be examined with a simple structure can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram showing a structural example of an optical system of an ophthalmic device according to a first embodiment.

[0027] Figure 2 It is a schematic diagram showing a structural example of a control system of an ophthalmic device according to a first embodiment.

[0028] Figure 3 It is a schematic diagram showing a structural example of an optical system of an ophthalmic device according to a first embodiment.

[0029] Figure 4 It is an operation explanatory diagram of an ophthalmic device according to a first embodiment.

[0030] Figure 5 It is an operation explanatory diagram of an ophthalmic device according to a first embodiment.

[0031] Figure 6 It is an operation explanatory diagram of an ophthalmic device according to a first embodiment.

[0032] Figure 7 It is an operation explanatory diagram of an ophthalmic device according to a first embodiment.

[0033] Figure 8 It is a sequence diagram showing an operation example of an ophthalmic device according to a first embodiment.

[0034] Figure 9 It is an operation explanatory diagram of an ophthalmic device according to a first embodiment.

[0035] Figure 10 It is a schematic diagram showing a structural example of a control system of an ophthalmic device according to a second embodiment.

[0036] Figure 11 It is an operation explanatory diagram of an ophthalmic device according to a second embodiment.

[0037] Figure 12 It is a sequence diagram showing an operation example of the ophthalmic device according to the second embodiment.

[0038] Figure 13 It is an operation explanatory diagram of the ophthalmic device according to the second embodiment. Detailed Embodiment

[0039] Examples of embodiments of the ophthalmic device, its control method, and program according to the present invention will be described in detail with reference to the accompanying drawings. In addition, the content of the documents described in this specification can be appropriately incorporated as the content of the following embodiments.

[0040] The ophthalmic device according to the present embodiment illuminates a predetermined part of the eye to be examined while moving the irradiation position (illumination area, irradiation range) of the slit-shaped illumination light, and uses an image sensor in which light-receiving elements are arranged one-dimensionally or two-dimensionally to receive the return light from the predetermined part. The light-receiving result of the return light is read from the light-receiving element at the light-receiving position corresponding to the irradiation position of the illumination light in synchronization with the movement timing of the irradiation position of the illumination light. In some embodiments, the predetermined part is the anterior eye part or the posterior eye part. The anterior eye part includes the cornea, iris, lens, ciliary body, zonular fibers, etc. The posterior eye part includes the vitreous body, fundus, or its vicinity (retina, choroid, sclera, etc.).

[0041] The control method of the ophthalmic device according to the embodiment includes one or more steps for implementing the processing executed by a processor (computer) in the ophthalmic device according to the embodiment. The program according to the embodiment causes the processor to execute each step of the control method of the ophthalmic device according to the embodiment.

[0042] In this specification, the "processor" refers to, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an ASIC (Application Specific Integrated Circuit), a programmable logic device (e.g., an SPLD (Simple Programmable Logic Device), a CPLD (Complex Programmable Logic Device), an FPGA (Field Programmable Gate Array), etc.). The processor realizes the functions according to the embodiment, for example, by reading and executing a program stored in a storage circuit or a storage device.

[0043] Hereinafter, a case where the ophthalmic apparatus according to the embodiment obtains a fundus image of an eye to be examined will be mainly described. In the ophthalmic apparatus according to the first embodiment, high-precision synchronization of the light scanner and the light receiving element (imaging element) is achieved to improve the image quality of the obtained image. In the ophthalmic apparatus according to the second embodiment, high-precision synchronization of the light scanner, the light receiving element, and the light source is achieved to improve the image quality of the obtained image.

[0044] <First Embodiment>

[0045] [Structure of Optical System]

[0046] Figures 1 to 3 The schematic diagram which shows the structural example of the ophthalmic apparatus which concerns on 1st Embodiment. Figure 1 Represents a structural example of the optical system of the ophthalmic apparatus 1 according to the first embodiment. Figure 2 The block diagram which represents the structural example of the control system (processing system) of the ophthalmic apparatus 1 which concerns on 1st Embodiment. Figure 3 Schematically represents when observing from the direction of the optical axis O Figure 1 The structural example of the iris diaphragm 21. In Figures 1 to 3 The same parts are denoted by the same reference numerals, and the description thereof is appropriately omitted.

[0047] The ophthalmic apparatus 1 includes a light source 10, an illumination optical system 20, a light scanner 30, a projection optical system 35, a photographing optical system 40, and an imaging device 50. In some embodiments, the illumination optical system 20 includes at least one of the light source 10, the light scanner 30, and the projection optical system 35. In some embodiments, the photographing optical system 40 includes the imaging device 50. In some embodiments, the projection optical system 35 or the photographing optical system 40 includes the light scanner 30.

[0048] (Light Source 10)

[0049] The light source 10 includes a visible light source for generating light in the visible region. For example, the light source 10 generates light having a central 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 white light source or a light source capable of outputting light of various color components of RGB. In some embodiments, the light source 10 includes a light source capable of switching and outputting light in the infrared region or light in the visible region. The light source 10 is disposed at a position that is optically non-conjugate to the fundus Ef and the iris, respectively.

[0050] (Illumination Optical System 20)

[0051] The illumination optical system 20 generates slit-shaped illumination light using the light from the light source 10. The illumination optical system 20 guides the generated illumination light to the optical scanner 30.

[0052] The illumination optical system 20 includes an iris diaphragm 21, a slit 22, and relay lenses 23. The light from the light source 10 passes through the opening formed in the iris diaphragm 21, passes through the opening formed in the slit 22, and passes through the relay lenses 23. The relay lenses 23 include one or more lenses. The light passing through the relay lenses 23 is guided to the optical scanner 30.

[0053] (Iris diaphragm 21)

[0054] The iris diaphragm 21 (specifically, the opening described later) can be disposed at a position that is optically substantially conjugate to the iris (pupil) of the eye E to be examined. The iris diaphragm 21 is formed with one or more openings at positions away from the optical axis O. For example, as Figure 3 shown, the iris diaphragm 21 is formed with openings 21A, 21B having a predetermined thickness in the circumferential direction centered on the optical axis O. The openings formed in the iris diaphragm 21 define the incident position (incident shape) of the illumination light on the iris of the eye E to be examined. For example, by forming the openings 21A, 21B as Figure 3 shown, when the pupil center of the eye E to be examined is disposed on the optical axis O, the illumination light can be made to enter the eye from a position deviated from the pupil center (specifically, a point-symmetric position centered on the pupil center).

[0055] In addition, by changing the relative position between the light source 10 and the opening formed in the iris diaphragm 21, the light quantity distribution of the light passing through the opening formed in the iris diaphragm 21 can be changed.

[0056] (Slit 22)

[0057] The slit 22 (specifically, the opening described later) can be disposed at a position that is optically substantially conjugate to the fundus Ef of the eye E to be examined. For example, the slit 22 is formed with an opening in a direction corresponding to the line direction (row direction) read by the image sensor 51 described later using the rolling shutter method. The opening formed in the slit 22 defines the irradiation pattern of the illumination light on the fundus Ef of the eye E to be examined.

[0058] The slit 22 can be moved in the optical axis direction of the illumination optical system 20 by a moving mechanism (the moving mechanism 22D described later). The moving mechanism is controlled by the control unit 100 described later to move the slit 22 in the optical axis direction. For example, the control unit 100 controls the moving mechanism according to the state of the eye E to be examined. Thus, the position of the slit 22 can be moved according to the state of the eye E to be examined (specifically, the refractive power, the shape of the fundus Ef).

[0059] In some embodiments, the slit 22 is configured to change at least one of the position and shape of the opening portion according to the state of the eye E to be examined without moving in the optical axis direction. The function of such a slit 22 is realized by, for example, a liquid crystal shutter.

[0060] The light from the light source 10 that has passed through the opening portion formed in the iris aperture 21 passes through the opening portion formed in the slit 22 and is output as slit-shaped illumination light. The slit-shaped illumination light passes through the relay lens 23 and is guided to the optical scanner 30.

[0061] (Optical scanner 30)

[0062] The optical scanner 30 is disposed at a position that is substantially optically conjugate to the iris of the eye E to be examined. The optical scanner 30 deflects the slit-shaped illumination light (the slit-shaped light that has passed through the opening portion formed in the slit 22) that has passed through the relay lens 23. Specifically, the optical scanner 30 changes the deflection angle within a predetermined deflection angle range with the iris of the eye E or its vicinity as the scanning center position, and deflects the slit-shaped illumination light for sequentially illuminating a predetermined illumination range of the fundus Ef, thereby guiding the illumination light to the projection optical system 35. The optical scanner 30 can deflect the illumination light one-dimensionally or two-dimensionally.

[0063] When deflecting one-dimensionally, the optical scanner 30 includes a current scanner that deflects the illumination light within a predetermined deflection angle range based on a predetermined deflection direction. When deflecting two-dimensionally, the optical scanner 30 includes a first current scanner and a second current scanner. The first current scanner deflects the illumination light in such a manner that the irradiation position of the illumination light moves in a horizontal direction orthogonal to the optical axis of the illumination optical system 20. The second current scanner deflects the illumination light deflected by the first current scanner in such a manner that the irradiation position of the illumination light moves in a vertical direction orthogonal to the optical axis of the illumination optical system 20. The scanning method of moving the irradiation position of the illumination light by the optical scanner 30 includes, for example, horizontal scanning, vertical scanning, cross scanning, radial scanning, circular scanning, concentric circle scanning, spiral scanning, etc.

[0064] The optical scanner 30 is, for example, a non-resonant type optical scanner. In this case, the control unit 100 described later can set one or more orientations of the deflection plane of the optical scanner 30 in such a manner that the illumination light is irradiated to a desired irradiation range. The optical scanner 30 is controlled by the control unit 100 described later, and by changing the orientation of the deflection plane to change the deflection angle (deflection angle of the deflection plane) of the illumination light, a scanning position signal Spos corresponding to the voltage level of the deflection angle can be output.

[0065] In some embodiments, the optical scanner 30 is, for example, a resonant optical scanner. In this case, the control unit 100 described later sets the orientation of the deflection surface of the scanning center and the scanning range based on the scanning center with respect to the optical scanner 30 in such a manner that the illumination light is irradiated to a desired irradiation range. The optical scanner 30 is controlled by the control unit 100 described later, and by changing the orientation of the deflection surface, the deflection angle of the illumination light (the deflection angle of the deflection surface) is changed, and a scanning position signal Spos corresponding to the voltage level of the deflection angle can be output.

[0066] (Projection optical system 35)

[0067] The projection optical system 35 guides the illumination light deflected by the optical scanner 30 to the fundus Ef of the eye E to be examined. In the embodiment, the projection optical system 35 guides the illumination light deflected by the optical scanner 30 to the fundus Ef via the optical path after being optically coupled with the optical path of the imaging optical system 40 through the aperture mirror 45 as the optical path coupling member described later.

[0068] The projection optical system 35 includes relay lenses 41, a black dot plate 42, a mirror 43, and a relay lens 44. Each of the relay lenses 41 and 44 includes one or more lenses.

[0069] (Black dot plate 42)

[0070] The black dot plate 42 is disposed at a position that is optically substantially conjugate to the lens surface of the objective lens 46 or its vicinity. 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 (illumination optical system 20).

[0071] In this projection optical system 35, the illumination light deflected by the optical scanner 30 passes through the relay lens 41, passes through the black dot plate 42, and is reflected by the mirror 43 toward the aperture mirror 45.

[0072] (Imaging optical system 40)

[0073] The imaging optical system 40 guides the illumination light guided by the projection optical system 35 to the fundus Ef of the eye E to be examined, and at the same time, guides the return light of the illumination light from the fundus Ef to the imaging device 50.

[0074] In the imaging 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 aperture mirror 45 as the optical path coupling member for coupling these optical paths, it is possible to perform pupil division on the illumination light and its return light.

[0075] The imaging optical system 40 includes an aperture mirror 45, an objective lens 46, a focusing lens 47, a relay lens 48, and an imaging lens 49. Each of the relay lenses 48 includes one or more lenses.

[0076] (Pore mirror 45)

[0077] A pore is formed in the pore mirror 45 and is disposed on the optical axis of the imaging optical system 40. The pore of the pore mirror 45 is disposed at a position that is optically approximately conjugate to the iris of the eye E to be examined. The pore mirror 45 reflects the illumination light from the projection optical system 35 toward the objective lens 46 in the peripheral region of the pore portion.

[0078] (Focusing lens 47)

[0079] The focusing lens 47 can be moved in the direction of the optical axis of the imaging optical system 40 by a moving mechanism (not shown). The moving mechanism is controlled by a control unit 100 described later, and moves the focusing lens 47 in the direction of the optical axis. Thus, according to the state of the eye E to be examined, the return light of the illumination light that has passed through the pore of the pore mirror 45 can be imaged on the light-receiving surface of the image sensor 51 of the imaging device 50.

[0080] In such an imaging 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 pore formed in the pore mirror 45. The illumination light reflected in the peripheral region of the pore mirror 45 is refracted by the objective lens 46, enters the eye through the pupil of the eye E to be examined, and illuminates the fundus Ef of the eye E to be examined.

[0081] The return light of the illumination light from the fundus Ef is refracted by the objective lens 46, passes through the pore of the pore 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 imaging device 50 through the imaging lens 49.

[0082] (Imaging device 50)

[0083] The imaging device 50 includes an image sensor 51 that receives the return light of the illumination light guided from the fundus Ef of the eye E to be examined through the imaging optical system 40. The imaging device 50 is controlled by a control unit 100 described later and can output the light-receiving result of the return light.

[0084] (Image sensor 51)

[0085] The image sensor 51 implements the function of a pixelated light receiver. The light-receiving surface (detection surface, imaging surface) of the image sensor 51 can be disposed at a position that is optically approximately conjugate to the fundus Ef.

[0086] Based on the light-receiving result of the image sensor 51, it is acquired and read by the rolling shutter method. In some embodiments, the control unit 100 described later controls the image sensor 51 to perform the reading control of the light-receiving result. In some embodiments, the image sensor 51 can automatically output the light-receiving result corresponding to a predetermined row together with the information indicating the light-receiving position.

[0087] This image sensor 51 includes a CMOS image sensor. In this case, in the image sensor 51, a plurality of pixel (light-receiving element) groups arranged in the row direction include a plurality of pixels arranged in the column direction. Specifically, the image sensor 51 includes a plurality of two-dimensionally arranged pixels, a plurality of vertical signal lines, and horizontal signal lines. Each pixel includes a photodiode (light-receiving element) and a capacitor. The plurality of vertical signal lines are provided in each pixel group in the column direction (vertical direction) orthogonal to the row direction (horizontal direction). Each vertical signal line is selectively electrically connected to the pixel group that stores the charge corresponding to the light-receiving result. The horizontal signal line is selectively electrically connected to the plurality of vertical signal lines. Each pixel stores the charge corresponding to the light-receiving result of the return light, and reads the stored charge sequentially for each pixel group in the row direction, for example. For example, for each row in the row direction, a voltage corresponding to the charge stored in each pixel is provided to the vertical signal line. The plurality of vertical signal lines are selectively electrically connected to the horizontal signal line. By sequentially performing the reading operation for each row in the above row direction in the vertical direction, the light-receiving results of the plurality of two-dimensionally arranged pixels can be read.

[0088] For such an image sensor 51, the light-receiving result of the return light is obtained (read) in a rolling shutter manner, thereby obtaining a light-receiving image corresponding to a desired virtual aperture shape extending in the row direction. Such control is disclosed in, for example, the specification of U.S. Patent No. 8237835.

[0089] Figure 4 A working explanatory diagram of the ophthalmic device 1 according to the first embodiment is shown. Figure 4 Schematically shows the irradiation range IP of the slit-shaped illumination light irradiated onto the fundus Ef and the virtual aperture range OP in the light-receiving surface SR of the image sensor 51.

[0090] For example, the control unit 100 described later deflects the slit-shaped illumination light formed by the illumination optical system 20 by means of the light scanner 30. Thus, in the fundus Ef, the irradiation range IP of the slit-shaped illumination light moves sequentially in the direction (for example, the vertical direction) orthogonal to the slit direction (for example, the row direction, the horizontal direction).

[0091] In the light-receiving surface SR of the image sensor 51, for example, the control unit 100 described later changes the pixels to be acquired in units of rows, thereby setting the virtual aperture range OP. Desirably, the aperture range OP is the light-receiving range IP' of the return light of the illumination light in the light-receiving surface SR or a range wider than the light-receiving range IP'. For example, the control unit 100 described later performs the movement control of the aperture range OP in synchronization with the movement control of the irradiation range IP of the illumination light. Thereby, without being affected by unnecessary scattered light, a high-quality image of the fundus Ef with strong contrast can be obtained with a simple structure.

[0092] Figure 5 and Figure 6 schematically shows an example of the control timing of the rolling shutter method for the image sensor 51. Figure 5 represents an example of the timing of the read control for the image sensor 51. Figure 6 is a diagram obtained by superimposing the movement control timing of the irradiation range IP (light receiving range IP') of the illumination light on the read control timing of Figure 5 . In Figure 5 and Figure 6 , the horizontal axis represents the number of rows of the image sensor 51, and the vertical axis represents time.

[0093] In addition, in Figure 5 and Figure 6 , for ease of explanation, the case where the number of rows of the image sensor 51 is 1920 is described, but the structure according to the first embodiment is not limited to the number of rows. Further, in Figure 6 , for ease of explanation, the slit width (width in the row direction) of the slit-shaped illumination light is set to be equivalent to 40 rows.

[0094] The read control in the row direction includes reset control, exposure control, charge transfer control, and output control. The reset control is a control for initializing the amount of charge accumulated in the pixels in the row direction. The exposure control is a control for irradiating light onto the photodiode and accumulating charge corresponding to the amount of received light in the capacitor. The charge transfer control is a control for transferring the amount of charge accumulated in the pixels to the vertical signal line. The output control is a control for outputting the amount of charge accumulated in the plurality of vertical signal lines via the horizontal signal line. That is, as Figure 5 shows, 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 the reset control, the time Te required for the exposure control (exposure time), the time Tc required for the charge transfer control, and the time Tout required for the output control.

[0095] In Figure 5 , the read (acquisition) start timing (start timing of time Tc) is shifted in units of rows, thereby acquiring the light reception result (amount of charge) in the pixels within the desired range accumulated in the image sensor 51. For example, when Figure 5 the pixel range shown is an image equivalent to one frame, the frame rate FR is uniquely determined.

[0096] In the present embodiment, the irradiation position of the illumination light having a slit width equivalent to a plurality of rows in the fundus Ef is sequentially shifted in the direction corresponding to the column direction in the fundus Ef.

[0097] For example, as Figure 6As shown, every predetermined shift time Δt, 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. The shift time Δt is obtained by dividing the exposure time Te of the pixels in the image sensor 51 by the slit width of the illumination light (for example, the number of rows of the slit width = 40) (Δt = Te / 40). Synchronized with the movement timing of the irradiation position, the read start timing of each row of pixels is delayed in units of the shift time Δt for each row. Thus, a high-quality image of the fundus Ef with strong contrast can be obtained with simple control and in a short time.

[0098] In some embodiments, the image sensor 51 is composed of one or more line sensors.

[0099] [Structure of the control system]

[0100] As Figure 2 shown, the control system of the ophthalmic device 1 is centered around the control unit 100. In addition, at least a part of the structure of the control system may be included in the ophthalmic device 1.

[0101] (Control unit 100)

[0102] The control unit 100 controls each part of the ophthalmic device 1. The control unit 100 includes a main control unit 101 and a storage unit 102. The main control unit 101 includes a processor and executes processing according to the program stored in the storage unit 102, thereby executing the control processing of each part of the ophthalmic device 1.

[0103] (Main control unit 101)

[0104] The main control unit 101 controls the light source 10, the moving mechanism 10D, the illumination optical system 20, the light scanner 30, the imaging optical system 40, the imaging device 50, the data processing unit 200, and the voltage detection circuit 210.

[0105] The control of the light source 10 includes the lighting, extinguishing (or switching of the light wavelength region), and light quantity change control of the light source.

[0106] The moving mechanism 10D changes at least one of the position and orientation of the light source 10 through a known mechanism. The main control unit 101 can change at least one of the relative position and relative orientation of the light source 10 with respect to the iris aperture 21 and the slit 22.

[0107] The control of the illumination optical system 20 includes the 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 unit 101 controls the moving mechanism 22D according to the state of the eye E to be examined, and thereby arranges the slit 22 at a position corresponding to the state of the eye E to be examined. The state of the eye E to be examined includes the shape of the fundus Ef, the refractive power, the axial length of the eye, etc. The refractive power can be obtained by a known eye refractive power measuring device as disclosed in, for example, Japanese Patent Laid-Open No. 61-293430 or Japanese Patent Laid-Open No. 2010-259495. The axial length of the eye can be obtained from the measured value of a known axial length measuring device or an optical coherence tomograph.

[0108] For example, first control information that pre-associates the position of the slit 22 on the optical axis of the illumination optical system 20 corresponding to the refractive power is stored in the storage unit 102. The main control unit 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 so that the slit 22 is arranged at the specified position.

[0109] Here, as the slit 22 moves, the light quantity distribution of the light passing through the opening of the slit 22 changes. At this time, as described above, the main control unit 101 can change the position and orientation of the light source 10 by controlling the moving mechanism 10D.

[0110] The control of the light scanner 30 includes the control of the angle of the deflection surface that deflects the illumination light. By controlling the angle range of the deflection surface, the scanning range (scanning start position and scanning end position) can be controlled. By controlling the change speed of the deflection surface angle, the scanning speed can be controlled.

[0111] The control of the imaging optical system 40 includes the control of the moving mechanism 47D. The moving mechanism 47D moves the focusing lens 47 in the optical axis direction of the imaging optical system 40. The main control unit 101 can control the moving mechanism 47D based on the analysis result of the image obtained by the image sensor 51. In addition, the main control unit 101 can control the moving mechanism 47D based on the operation content of the user using the operation unit 110 described later.

[0112] The control of the imaging device 50 includes the control of the image sensor 51. The control of the image sensor 51 includes the control for reading the light reception result in a rolling shutter manner (for example, setting the light reception size corresponding to the size of the illumination pattern, etc.). In addition, the control of the image sensor 51 includes reset control, exposure control, charge transfer control, output control, etc. The time Tr required for reset control, the time Te required for exposure control (exposure time), the time Tc required for charge transfer control, the time Tout required for output control, etc. can be changed.

[0113] The control of the data processing unit 200 includes various image processing and analysis processing for the light reception results obtained by the image sensor 51. The image processing includes noise reduction processing for the light reception results and brightness correction processing for easily identifying a predetermined part drawn in the light reception image based on the light reception results. The analysis processing includes specific processing of the focus state and the like.

[0114] Based on the light reception results read from the image sensor 51 by the rolling shutter method, the data processing unit 200 can form a light reception image corresponding to an arbitrary opening range. As an image forming unit, the data processing unit 200 can sequentially form light reception images corresponding to the opening ranges, and form an image of the eye to be examined E from the plurality of formed light reception images.

[0115] The data processing unit 200 includes a processor and performs processing according to programs stored in a storage unit or the like, thereby implementing the above functions.

[0116] As described later, based on the scanner position signal from the optical scanner 30, the voltage detection circuit 210 outputs a trigger signal for instructing the start of obtaining the light reception results to the image sensor 51. The deflection angle of the illumination light by the optical scanner 30 can be determined based on the scanner position signal. The function of the voltage detection circuit 210 can be implemented by a known comparison circuit. This control of the voltage detection circuit 210 includes setting a threshold voltage based on the scanner position signal and the like, and this threshold voltage is used to determine whether the deflection angle of the illumination light by the optical scanner 30 is a desired deflection angle.

[0117] In some embodiments, the light source 10 includes two or more light sources. In this case, each of the two or more light sources is provided corresponding to two or more opening portions formed in the iris diaphragm 21. The main control unit 101 can change at least one of the position and the orientation (orientation in the direction where the light distribution amount is maximum) of each light source by controlling the moving mechanism provided corresponding to each of the two or more light sources.

[0118] (Storage unit 102)

[0119] The storage unit 102 stores various computer programs and data. The computer programs include an arithmetic program and a control program for controlling the ophthalmic device 1.

[0120] (Operation unit 110)

[0121] The operation unit 110 includes an operation device or an input device. The operation unit 110 includes buttons and switches provided on the ophthalmic device 1 (for example, an operation handle, an operation knob, etc.) and operation devices (a mouse, a keyboard, etc.). In addition, the operation unit 110 may include any operation device and input device such as a trackball, an operation panel, a switch, a button, and a dial.

[0122] (Display unit 120)

[0123] The display unit 120 displays an image of the eye E to be examined generated by the data processing unit 200. The display unit 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 unit 120 may include various display devices such as a touch panel provided on the housing of the ophthalmic device 1.

[0124] In addition, the operation unit 110 and the display unit 120 do not need to be configured as separate devices. For example, a device integrating a display function and an operation function such as a touch panel may be used. In this case, the operation unit 110 is configured to include the touch panel and a computer program. The operation content for the operation unit 110 is input to the control unit 100 as an electric signal. In addition, operations and information input may be performed using the 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 by a touch screen.

[0125] (Other structures)

[0126] In some embodiments, the ophthalmic device 1 further includes a fixation projection system. For example, in Figure 1 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 an internal fixation target or an external fixation target to the eye E to be examined. When presenting an internal fixation target to the eye E to be examined, the fixation projection system includes an LCD that is controlled by the control unit 100 to display the internal fixation target, and projects the fixation light beam output from the LCD onto the fundus of the eye E to be examined. The LCD is configured to be able to change the display position of the fixation target on its screen. By changing the display position of the fixation target on the LCD, the projection position of the fixation target in the fundus of the eye E to be examined can be changed. The display position of the fixation target in the LCD can be specified by the user by using the operation unit 110.

[0127] 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 positions between the device optical system and the eye E to be examined in a direction crossing the optical axis of the device optical system (objective lens 46). The Z alignment system is used to align the positions between the device optical system and the eye E to be examined in the optical axis direction of the ophthalmic device 1 (objective lens 46).

[0128] For example, the XY alignment system projects a bright spot (a bright spot in the infrared region or near-infrared region) onto the eye E to be examined. The data processing unit 200 acquires a front-eye image of the eye E to be examined after projecting the bright spot, and calculates the displacement between the bright spot image drawn on the acquired front-eye image and the alignment reference position. The control unit 100 relatively moves the device optical system and the eye E to be examined in a direction intersecting the optical axis direction through a moving mechanism (not shown) to eliminate the calculated displacement.

[0129] For example, the Z alignment system projects 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 front eye part of the eye E to be examined. The data processing unit 200 specifies the distance of the eye E to be examined relative to the device optical system from the light-receiving position of the alignment light that changes according to the distance of the eye E to be examined relative to the device optical system. The control unit 100 relatively moves the device optical system and the eye E to be examined in the optical axis direction through a moving mechanism (not shown) so that the specified distance becomes a desired working distance.

[0130] In some embodiments, the function of the alignment system is implemented by two or more front-eye cameras arranged at positions deviated from the optical axis of the device optical system. For example, as disclosed in Japanese Patent Application Laid-Open No. 2013-248376, the data processing unit 200 analyzes front-eye images of the eye E to be examined substantially simultaneously obtained by two or more front-eye cameras, and specifies the three-dimensional position of the eye E to be examined using a known triangulation method. The control unit 100 relatively moves the device optical system and the eye E to be examined three-dimensionally through a moving mechanism (not shown) so that the optical axis of the device optical system substantially coincides with the axis of the eye E and the distance of the device optical system relative to the eye E becomes a predetermined working distance.

[0131] As described above, in the ophthalmic device 1, the slit 22 (opening part), the imaging part (fundus Ef), and the image sensor 51 (light-receiving surface) are arranged at optically substantially conjugate positions. The ophthalmic device 1 can suppress the influence of unnecessary scattered light and obtain a clear image of the imaged part by moving the light-receiving opening in the image sensor 51 in conjunction with the irradiation position of the illumination light.

[0132] In the ophthalmic device 1 according to the first embodiment, the image sensor 51 receives and acquires the return light of the illumination light at an appropriate timing, thereby eliminating the influence of unnecessary scattered light and improving the image quality of the image of the eye E to be examined obtained based on the light-receiving result. Therefore, in the first embodiment, the light scanner 30 and the image sensor 51 are synchronized with high precision to achieve high image quality of the obtained image.

[0133] Figure 7 A schematic diagram for explaining the synchronization control of the ophthalmic device 1 according to the first embodiment is shown. InFigure 7 In, the same reference numerals are assigned to the same parts as Figure 2 and their descriptions are appropriately omitted.

[0134] As described above, the control unit 100 controls the deflection angle of the illumination light by the light scanner 30 (the angle of the deflection plane with respect to the reference angle). The control unit 100 controls the deflection angle of the illumination light by outputting a scanner control signal Scont to the light scanner 30. For example, by outputting a scanner control signal Scont having a desired voltage level to the light scanner 30, the angle of the deflection plane of the light scanner 30 can be set to a desired deflection angle.

[0135] The light scanner 30 can output a scanner position signal Spos corresponding to the angle of the deflection plane. For example, the scanner position signal Spos is a voltage level signal corresponding to the angle of the deflection plane. By specifying the voltage level of the scanner position signal Spos, the angle of the deflection plane of the light scanner 30 (the deflection angle of the illumination light by the light scanner 30) can be specified.

[0136] The voltage detection circuit 210 detects whether the deflection angle of the illumination light by the light scanner 30 is a desired deflection angle based on the voltage level of the scanner position signal Spos from the light scanner 30, and outputs a trigger signal Tr corresponding to the detection result to the image sensor 51. Specifically, the voltage detection circuit 210 compares the scan position signal Spos with a first threshold voltage TH1, obtains a trigger signal Tr having a voltage level corresponding to the comparison result between the scan position signal Spos and the first threshold voltage TH1, and outputs it to the image sensor 51.

[0137] The image sensor 51 starts acquiring the light reception result of the return light of the illumination light on the light reception surface in synchronization with the change timing (e.g., rising edge) of the trigger signal Tr from the voltage detection circuit 210, and transmits the acquired light reception result to the control unit 100.

[0138] [Operation]

[0139] Next, the operation of the ophthalmic device 1 will be described.

[0140] Figure 8 An operation example of the ophthalmic device 1 according to the first embodiment is shown. Figure 8 It is a sequence diagram showing the sequence of the operation example of the ophthalmic device 1.

[0141] First, the control unit 100 outputs a scanner control signal Scont (SQ1) to the light scanner 30 so that the illumination light is deflected at a desired deflection angle.

[0142] In the optical scanner 30, the orientation of the deflection surface is changed at a deflection angle corresponding to the scanner control signal Scont from the control unit 100 (SQ2). Thereby, a predetermined region of the fundus Ef can be illuminated with the illumination light. The optical scanner 30 outputs a scanner position signal Spos corresponding to the deflection angle of the deflection surface (SQ3).

[0143] The voltage detection circuit 210 compares the scanner position signal Spos from the optical scanner 30 with a predetermined first threshold voltage TH1. Thereby, the voltage detection circuit 210 can detect from the optical scanner 30 whether the light receiving result of the return light of the illumination light by the image sensor 51 should be obtained in the deflection direction of the illumination light (SQ4).

[0144] The voltage detection circuit 210 compares the scanner position signal Spos from the optical scanner 30 with a predetermined first threshold voltage TH1, and outputs a trigger signal Tr having a voltage level corresponding to the comparison result (SQ5).

[0145] For example, when the scanner position signal Spos is equal to or higher than the first threshold voltage TH1, a trigger signal Tr having a first power supply voltage level (L level) is output, and when the scanner position signal Spos is less than the first threshold voltage TH1, a trigger signal Tr having a second power supply voltage level (H level) is output. In this case, when the scanner position signal Spos is equal to or higher than the first threshold voltage TH1, the voltage detection circuit 210 outputs the trigger signal Tr having the L level to the image sensor 51.

[0146] Since the voltage level of the trigger signal Tr from the voltage detection circuit 210 does not change, the image sensor 51 does not start obtaining the light receiving result of the return light of the illumination light.

[0147] Subsequently, the control unit 100 outputs a scanner control signal Scont to the optical scanner 30 so that the illumination light is deflected at the next desired deflection angle (SQ6). In some embodiments, the control unit 100 outputs the scanner control signal Scont to the optical scanner 30 at a predetermined time interval. In some embodiments, when receiving a notification that the transmission of the light receiving result from the image sensor 51 is completed, the control unit 100 outputs a scanner control signal Scont for deflecting at the next desired deflection angle to the optical scanner 30.

[0148] Thereafter, similarly, in the optical scanner 30, the orientation of the deflection surface is changed at a deflection angle corresponding to the scanner control signal Scont from the control unit 100 (SQ7). The optical scanner 30 outputs a scanner position signal Spos corresponding to the deflection angle of the deflection surface (SQ8).

[0149] Similar to SQ4, the voltage detection circuit 210 compares the scanner position signal Spos from the optical scanner 30 with the first threshold voltage TH1 to detect whether the light reception result of the return light of the illumination light by the image sensor 51 should be acquired (SQ9).

[0150] The voltage detection circuit 210 compares the scanner position signal Spos from the optical scanner 30 with the first threshold voltage TH1 and outputs a trigger signal Tr with a voltage level corresponding to the comparison result (SQ10).

[0151] In this case, when the scanner position signal Spos changes from a voltage level above the first threshold voltage TH1 to a voltage level less than the first threshold voltage TH1, the voltage detection circuit 210 outputs a trigger signal Tr that changes from the L level to the H level to the image sensor 51.

[0152] The image sensor 51 starts acquiring the light reception result of the return light of the illumination light in a predetermined row (see Figure 6 ) synchronously with the rising edge of the trigger signal Tr from the voltage detection circuit 210 changing from the L level to the H level (SQ11).

[0153] The image sensor 51 transmits the acquired light reception result to the control unit 100 at a predetermined timing (SQ12). The predetermined timing can be a pre-determined timing or a timing determined by the end timing of acquiring a predetermined light reception result. In some embodiments, the control unit 100 performs read control on the image sensor 51 so that the image sensor 51 transmits the light reception result to the control unit 100.

[0154] In order to divide and sequentially illuminate the predetermined illumination areas of the illumination light in the fundus Ef, the above series of controls are repeated for each illumination area.

[0155] Figure 9 An example of the synchronization control timing of the ophthalmic device 1 according to the first embodiment is shown. Figure 9 Schematically represents the relationship between the scanner control signal Scont, the scanner position signal Spos, the trigger signal Tr, and the acquisition start timing of the light reception result of the image sensor 51.

[0156] In Figure 9In a first timing chart in which the voltage level of the scanner control signal Scont is represented on the vertical axis and time t is represented on the horizontal axis, an example of the timing of the scanner control signal Scont is shown. Further, in a second timing chart in which the voltage level of the scanner position signal Spos is represented on the vertical axis and time t is represented on the horizontal axis, an example of the timing of the scanner position signal Spos is shown. Further, in a third timing chart in which the voltage level of the trigger signal Tr is represented on the vertical axis and time t is represented on the horizontal axis, an example of the timing of the trigger signal Tr is shown.

[0157] The control unit 100 changes the illumination area in sequence by sequentially outputting the scanner control signal Scont in such a manner as to sequentially illuminate a predetermined imaging area in the fundus Ef as Figure 6 shown. For example, as Figure 9 shown, the control unit 100 sequentially outputs the scanner control signal Scont to the optical scanner 30.

[0158] The optical scanner 30 changes the deflection plane so as to become a deflection angle corresponding to the scanner control signal Scont from the control unit 100. At this time, the optical scanner 30 changes the deflection plane after a predetermined delay time Δdt has elapsed with respect to the scanner control signal Scont. The optical scanner 30 outputs a scanner position signal Spos corresponding to the deflection angle of the deflection plane.

[0159] As described above, the voltage detection circuit 210 compares the voltage level of the scanner position signal Spos with the first threshold voltage TH1, and outputs a trigger signal Tr having a voltage level corresponding to the comparison result to the image sensor 51. When the voltage level of the scanner position signal Spos changes from a voltage level equal to or higher than the first threshold voltage TH1 to a voltage level lower than the first threshold voltage TH1, the voltage detection circuit 210 changes the voltage level of the trigger signal Tr and outputs a trigger signal Tr of H level.

[0160] The image sensor 51 starts acquiring the light reception result of the return light of the illumination light in synchronization with the rising edge of the trigger signal Tr from the voltage detection circuit 210. For example, during the acquisition period, as Figure 6 shown, reset control is performed during Tr, exposure control is performed during Te, charge transfer control is performed during Tc, and output control is performed during Tout.

[0161] As described above, it is possible to control the timing of acquiring the light reception result of the return light of the illumination light of the image sensor 51 in synchronization with the scanner position signal Spos of the optical scanner 30 that can be controlled by the scanner control signal Scont from the control unit 100. Thereby, it is possible to receive and acquire the return light of the illumination light with high precision with respect to the illumination area of the illumination light, thereby eliminating the influence of unnecessary scattered light and improving the image quality of the obtained eye E to be examined.

[0162] The voltage detection circuit 210 is an example of the "first voltage detection circuit" according to the present embodiment.

[0163] <Second Embodiment>

[0164] The configuration of the ophthalmic device according to the present embodiment is not limited to the configuration of the ophthalmic device 1 according to the first embodiment. In the ophthalmic device according to the second embodiment, by synchronizing the optical scanner 30, the image sensor 51, and the light source 10 with high precision, high image quality of the image of the eye E to be examined is achieved.

[0165] Hereinafter, the differences between the ophthalmic device according to the second embodiment and the ophthalmic device 1 according to the first embodiment will be mainly described.

[0166] [Structure of the Optical System]

[0167] The structure of the optical system of the ophthalmic device according to the second embodiment is the same as the structure of the optical system of the ophthalmic device 1 according to the first embodiment.

[0168] [Structure of the Control System]

[0169] Figure 10 The block diagram showing the structural example of the control system of the ophthalmic device according to the second embodiment is shown. In Figure 10 those, the same parts as Figure 2 are denoted by the same reference numerals, and the description thereof is appropriately omitted.

[0170] The difference between the structure of the control system of the ophthalmic device according to the second embodiment and the structure of the control system of the ophthalmic device 1 according to the first embodiment is that a voltage detection circuit 210a is provided instead of the voltage detection circuit 210.

[0171] In addition to the function of the voltage detection circuit 210, the voltage detection circuit 210a has a voltage detection function for controlling the light source 10 and an output function for the light source control signal of the light source 10. The voltage detection circuit 210a outputs a light source control signal LScont for performing on / off control of the light source 10 in synchronization with the change of the scanner position signal Spos.

[0172] Figure 11 The schematic diagram for explaining the synchronization control of the ophthalmic device according to the second embodiment is shown. In Figure 11 those, the same parts as Figure 7 or Figure 10 are denoted by the same reference numerals, and the description thereof is appropriately omitted.

[0173] The voltage detection circuit 210a includes a first voltage detection circuit 211a and a second voltage detection circuit 212a. The first voltage detection circuit 211a has the same function as the voltage detection circuit 210 of the first embodiment. That is, the first voltage detection circuit 211a detects whether the deflection angle of the light scanner 30 with respect to the illumination light is a desired deflection angle based on the voltage level of the scanner position signal Spos from the light scanner 30, and outputs a trigger signal Tr corresponding to the detection result to the image sensor 51. Specifically, the first voltage detection circuit 211a compares the scanner position signal Spos with a first threshold voltage TH1, and outputs a trigger signal Tr having a voltage level corresponding to the comparison result between the scanner position signal Spos and the first threshold voltage TH1 to the image sensor 51.

[0174] The second voltage detection circuit 212a detects whether the deflection angle of the light scanner 30 with respect to the illumination light is a desired deflection angle according to the voltage level of the scanner position signal Spos, and outputs a light source control signal LScont corresponding to the detection result to the light source 10. Specifically, the second voltage detection circuit 212a compares the scanner position signal Spos with a second threshold voltage TH2, and outputs a light source control signal LScont having a voltage level corresponding to the comparison result between the scanner position signal Spos and the second threshold voltage TH2 to the light source 10. For example, when the scanner position signal Spos is equal to or higher than the second threshold voltage TH2, the second voltage detection circuit 212a outputs a light source control signal LScont of L level. The second threshold voltage TH2 is, for example, a threshold voltage for switching the light source 10 from the off state to the on state.

[0175] In addition, the second voltage detection circuit 212a compares the scanner position signal Spos with a third threshold voltage TH3, and outputs a light source control signal LScont having a voltage level corresponding to the comparison result between the scanner position signal Spos and the third threshold voltage TH3 to the light source 10. For example, when the scanner position signal Spos is less than the third threshold voltage TH3, the second voltage detection circuit 212a outputs a light source control signal LScont of L level. The third threshold voltage TH3 is, for example, a threshold voltage for switching the light source 10 from the on state to the off state.

[0176] In addition, when the scanner position signal Spos is less than the second threshold voltage TH2 and equal to or higher than the third threshold voltage TH3, the second voltage detection circuit 212a outputs a light source control signal LScont of H level.

[0177] This function of the second voltage detection circuit 212a can be implemented by, for example, one or more known comparator circuits and RS flip-flop circuits. In order to obtain the light reception result of the image sensor 51 during the on state of the light source 10, the first threshold voltage TH1 can be a voltage between the second threshold voltage TH2 and the third threshold voltage TH3. In some embodiments, the voltage level of the first threshold voltage TH1 is substantially equal to the voltage level of the second threshold voltage TH2.

[0178] Similar to the first embodiment, the image sensor 51 starts obtaining the light reception result of the return light of the illumination light on the light reception surface synchronously with the change timing (e.g., rising edge) of the trigger signal Tr from the first voltage detection circuit 211a, and transmits the obtained light reception result to the control unit 100.

[0179] The light source 10 can be switched from the off state (non-lighting state) to the on state (lighting state) synchronously with the first change timing (e.g., rising edge) of the light source control signal LScont from the second voltage detection circuit 212a. In addition, the light source 10 can be switched from the on state to the off state synchronously with the second change timing (e.g., falling edge) of the light source control signal LScont from the second voltage detection circuit 212a.

[0180] [Operation]

[0181] Next, the operation of the ophthalmic device according to the second embodiment will be described.

[0182] Figure 12 An operation example of the ophthalmic device according to the second embodiment is shown. Figure 12 It is a sequence diagram showing the sequence of the operation example of the ophthalmic device of the second embodiment. In addition, it is assumed that the following control is executed when the light source 10 is in the off state.

[0183] First, similar to SQ1, the control unit 100 outputs a scanner control signal Scont (SQ21) to the optical scanner 30 in such a way that the illumination light is deflected at a desired deflection angle.

[0184] Similar to SQ2, in the optical scanner 30, the orientation of the deflection surface is changed to the deflection angle corresponding to the scanner control signal Scont from the control unit 100 (SQ22). Similar to SQ3, the optical scanner 30 outputs a scanner position signal Spos corresponding to the deflection angle of the deflection surface (SQ23).

[0185] When the voltage level of the scanner position signal Spos changes from a voltage level above the second threshold voltage TH2 to a voltage level less than the second threshold voltage TH2 (however, a voltage level above the first threshold voltage TH1), the first voltage detection circuit 211a does not change the voltage level of the trigger signal Tr, and the second voltage detection circuit 212a changes the voltage level of the light source control signal LScont (SQ24). The second voltage detection circuit 212a outputs the light source control signal LScont changed to the H level to the light source 10 (SQ25).

[0186] The light source 10 switches from the off state to the on state in synchronization with the change timing (rising edge) of the light source control signal LScont from the second voltage detection circuit 212a (SQ26).

[0187] For example, at a predetermined time interval separated by SQ21, the control unit 100 outputs a scanner control signal Scont to the optical scanner 30 in such a manner that the illumination light is deflected at the next desired deflection angle (SQ27). In the optical scanner 30, the orientation of the deflection plane is changed at a deflection angle corresponding to the scanner control signal Scont from the control unit 100 (SQ28). The optical scanner 30 outputs a scanner position signal Spos corresponding to the deflection angle of the deflection plane (SQ29).

[0188] When the voltage level of the scanner position signal Spos changes from a voltage level above the first threshold voltage TH1 to a voltage level less than the first threshold voltage TH1 (however, a voltage level higher than the third threshold voltage TH3), the first voltage detection circuit 211a changes the voltage level of the trigger signal Tr, and the second voltage detection circuit 212a does not change the voltage level of the light source control signal LScont (SQ30). The first voltage detection circuit 211a outputs the trigger signal Tr changed to the H level to the image sensor 51 (SQ31).

[0189] The image sensor 51 starts acquiring the light reception result of the return light of the illumination light for a predetermined row in synchronization with the rising edge of the trigger signal Tr from the voltage detection circuit 210 (SQ32).

[0190] The image sensor 51 transmits the acquired light reception result to the control unit 100 at a predetermined timing (SQ33).

[0191] Hereinafter, similarly, in order to divide the predetermined illumination area of the illumination light in the fundus Ef and perform illumination sequentially, the above series of controls are repeated for each illumination area.

[0192] Thereafter, for example, the control unit 100 outputs a scanner control signal Scont (SQ34) to the optical scanner 30 in such a manner that the illumination light is deflected at the next desired deflection angle. In the optical scanner 30, the orientation of the deflection surface is changed at the deflection angle corresponding to the scanner control signal Scont from the control unit 100 (SQ35). The optical scanner 30 outputs a scanner position signal Spos corresponding to the deflection angle of the deflection surface (SQ36).

[0193] When the voltage level of the scanner position signal Spos changes from a voltage level equal to or higher than the third threshold voltage TH3 to a voltage level lower than the third threshold voltage TH3, the first voltage detection circuit 211a does not change the voltage level of the trigger signal Tr, and the second voltage detection circuit 212a changes the voltage level of the light source control signal LScont (SQ37). The second voltage detection circuit 212a outputs the light source control signal LScont changed to the L level to the light source 10 (SQ38).

[0194] The light source 10 is switched from the on state to the off state in synchronization with the change timing (falling edge) of the light source control signal LScont from the second voltage detection circuit 212a (SQ39).

[0195] Figure 13 An example of the timing of the synchronization control of the ophthalmic device according to the second embodiment is shown. Figure 13 Schematically represents the relationship between the scanner control signal Scont, the scanner position signal Spos, the trigger signal Tr, the light source control signal LScont, and the acquisition start timing of the light reception result by the image sensor 51.

[0196] Figure 13 An example of the timing of the scanner control signal Scont in the first timing chart is shown. In addition, in the second timing chart, an example of the timing of the scanner position signal Spos is shown. In addition, in the third timing chart, an example of the timing of the trigger signal Tr is shown. In addition, in the fourth timing chart in which the voltage level of the light source control signal LScont is represented on the vertical axis and the time t is represented on the horizontal axis, an example of the timing of the light source control signal LScont is shown.

[0197] The control unit 100 is as follows Figure 6 shown, in such a manner that the predetermined imaging areas in the fundus Ef are sequentially illuminated, the illumination area is sequentially changed by sequentially outputting the scanner control signal Scont. For example, as Figure 13 shown, the control unit 100 sequentially outputs the scanner control signal Scont to the optical scanner 30.

[0198] The optical scanner 30 changes the deflection plane in such a way as to become a deflection angle corresponding to the scanner control signal Scont from the control unit 100. At this time, the optical scanner 30 changes the deflection plane after a predetermined delay time Δdt has elapsed with respect to the scanner control signal Scont. The optical scanner 30 outputs a scanner position signal Spos corresponding to the deflection angle of the deflection plane.

[0199] First, as described above, the second voltage detection circuit 212a compares the voltage level of the scanner position signal Spos with the second threshold voltage TH2, and outputs a light source control signal LScont having a voltage level corresponding to the comparison result to the light source 10. When the voltage level of the scanner position signal Spos changes from a voltage level equal to or higher than the second threshold voltage TH2 to a voltage level lower than the second threshold voltage TH2, the second voltage detection circuit 212a changes the voltage level of the light source control signal LScont and outputs a light source control signal LScont of H level.

[0200] The light source 10 is switched from the off state to the on state in synchronization with the rising edge of the light source control signal LScont from the second voltage detection circuit 212a.

[0201] Subsequently, as described above, the first voltage detection circuit 211a compares the voltage level of the scanner position signal Spos with the first threshold voltage TH1, and outputs a trigger signal Tr having a voltage level corresponding to the comparison result to the image sensor 51. When the voltage level of the scanner position signal Spos changes from a voltage level equal to or higher than the first threshold voltage TH1 to a voltage level lower than the first threshold voltage TH1 (however, TH1 > TH3), the first voltage detection circuit 211a changes the voltage level of the trigger signal Tr and outputs a trigger signal Tr of H level.

[0202] The image sensor 51 starts acquiring the light reception result of the return light of the illumination light in synchronization with the rising edge of the trigger signal Tr from the first voltage detection circuit 211a. For example, as Figure 6 shown, during the acquisition period, reset control is performed during Tr, exposure control is performed during Te, charge transfer control is performed during Tc, and output control is performed during Tout.

[0203] For example, after the light reception result is transmitted from the image sensor 51 to the control unit 100, the control unit 100 outputs a scanner control signal Scont to the optical scanner 30 and changes the orientation of the deflection surface. At this time, as described above, the second voltage detection circuit 212a compares the voltage level of the scanner position signal Spos with the third threshold voltage TH3 and outputs a light source control signal LScont having a voltage level corresponding to the comparison result to the light source 10. When the voltage level of the scanner position signal Spos changes from a voltage level equal to or higher than the third threshold voltage TH3 to a voltage level lower than the third threshold voltage TH3, the second voltage detection circuit 212a changes the voltage level of the light source control signal LScont and outputs a light source control signal LScont of L level.

[0204] The light source 10 switches from the on state to the off state in synchronization with the falling edge of the light source control signal LScont from the second voltage detection circuit 212a.

[0205] In addition, although the case where the light source 10 is switched to the off state based on the voltage level of the scanner position signal Spos has been described in the second embodiment, the structure according to the embodiment is not limited thereto. For example, after a predetermined period of time has elapsed since the light source 10 is switched to the on state based on the voltage level of the scanner position signal Spos, the control unit 100 controls the light source 10 to switch it to the off state.

[0206] As described above, the acquisition timing of the light reception result of the return light of the illumination light by the image sensor 51 and the irradiation timing of the illumination light by the light source 10 can be controlled in synchronization with the scanner position signal Spos of the optical scanner 30 that can be controlled by the scanner control signal Scont from the control unit 100. Thereby, the return light of the illumination light can be received and acquired with high precision with respect to the irradiation area of the illumination light, thereby eliminating the influence of unnecessary scattered light and improving the image quality of the eye E image to be acquired.

[0207] In addition, the image sensor 51 can start acquiring the light reception result during the period when the light source 10 is in the on state and end the acquisition of the light reception result, thereby reliably eliminating the influence of unnecessary scattered light and further improving the image quality of the eye E.

[0208] The first voltage detection circuit 211a is an example of the "first voltage detection circuit" according to the present embodiment. The second voltage detection circuit 212a is an example of the "second voltage detection circuit" according to the present embodiment. The second threshold voltage TH2 or the third threshold voltage TH3 is an example of the "second threshold voltage" according to the present embodiment.

[0209] [Function / Effect]

[0210] The functions and effects of an ophthalmic device, its control method, and a program according to an embodiment will be described.

[0211] An ophthalmic device (1) 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 unit (100, main control unit 101). The illumination optical system generates slit-shaped illumination light using the light from the light source. The light scanner deflects the illumination light and guides the illumination light to the fundus (Ef) of an eye to be examined (E). The photographing optical system guides the return light of the illumination light from the fundus to an image sensor (51), and the image sensor (51) acquires a light reception result of a region of a light reception surface corresponding to an illumination region of the illumination light in the fundus in a rolling shutter manner. The control unit controls the deflection angle of the illumination light by the light scanner. The light scanner outputs a scanner position signal (Spos) corresponding to the deflection angle of the illumination light. The image sensor starts acquiring the light reception result of the return light in synchronization with the scanner position signal.

[0212] According to this configuration, the light scanner and the image sensor can be synchronized with high precision with a simple configuration, it is possible to prevent acquisition of a light reception result of unnecessary scattered light, and a high-quality image of the eye to be examined formed based on the light reception result of the image sensor can be obtained.

[0213] In some embodiments, it includes: a first voltage detection circuit (voltage detection circuit 210, first voltage detection circuit 211a) that changes a trigger signal (Tr) according to a comparison result between the scanner position signal and a first threshold voltage (TH1), and the image sensor starts acquiring the light reception result in synchronization with the change of the trigger signal.

[0214] According to this configuration, the trigger signal is changed based on the voltage level of the scanner position signal, and the image sensor starts acquiring the light reception result in synchronization with the change of the trigger signal. Therefore, the light scanner and the image sensor can be synchronized with high precision with a simple configuration.

[0215] In some embodiments, the control unit outputs a scanner control signal (Scont) to the light scanner and deflects the illumination light at a deflection angle corresponding to the scanner control signal.

[0216] According to this configuration, a scanner position signal corresponding to the deflection angle can be generated by the scanner control signal, and thus the image sensor can start acquiring the light reception result in synchronization with the scanner control signal of the control unit.

[0217] In some embodiments, the light source is switched from an on state to an off state or from an off state to an on state in synchronization with the scanner position signal.

[0218] According to this structure, the optical scanner, the image sensor, and the light source can be synchronized with high precision in a simple structure, thereby preventing the acquisition of the light reception result of unnecessary scattered light and enabling the acquisition of a high-quality image of the eye to be examined formed based on the light reception result of the image sensor.

[0219] In some embodiments, it includes: a second voltage detection circuit (212a) that changes a light source control signal (LScont) for controlling the turning on and off of the light source according to the comparison result between the scanner position signal and the second threshold voltage (TH2, the third threshold voltage TH3), and the light source switches from the on state to the off state or from the off state to the on state synchronously with the change of the light source control signal.

[0220] According to this structure, the light source control signal is changed based on the voltage level of the scanner position signal, and the turning on and off of the light source are controlled synchronously with the change of the light source control signal, so that the scanner, the image sensor, and the light source can be synchronized with high precision in a simple structure.

[0221] In some embodiments, the image sensor starts and ends acquiring the light reception result during the period when the light source is in the on state.

[0222] According to this structure, the influence of unnecessary scattered light can be reliably eliminated, and the image quality of the eye to be examined can be further improved.

[0223] In some embodiments, the image sensor is a CMOS image sensor.

[0224] According to this structure, the optical scanner and the image sensor can be synchronized with high precision in a simple structure and at low cost.

[0225] The control method of the ophthalmic device (1) according to some embodiments is a control method of an ophthalmic device, and the ophthalmic device includes: a light source (10); an illumination optical system (20) that generates slit-shaped illumination light using the light from the light source; an optical scanner (30) that deflects the illumination light and guides the illumination light to the fundus (Ef) of the eye to be examined (E); a photographing optical system (40) that guides the return light of the illumination light from the fundus to an image sensor (51), and the image sensor (51) acquires the light reception result of the area of the light reception surface corresponding to the illumination area of the illumination light in the fundus moved by the optical scanner in a rolling shutter manner; a control unit (100, the main control unit 101) that controls the deflection angle of the illumination light by the optical scanner. The control method of the ophthalmic device includes: a first output step in which the optical scanner outputs a scanner position signal (Spos) corresponding to the deflection angle of the illumination light; and a light reception result acquisition step in which the image sensor starts acquiring the light reception result of the return light synchronously with the scanner position signal.

[0226] According to this method, while simplifying the structure of the ophthalmic device, the optical scanner and the image sensor can be synchronized with high precision, thereby preventing the light reception result of unnecessary scattered light from being obtained and obtaining a high-quality image of the eye to be examined formed based on the light reception result of the image sensor.

[0227] Some embodiments include: a first voltage detection step of changing a trigger signal according to a comparison result between a scanner position signal and a first threshold voltage (TH1), and in a light reception result acquisition step, the image sensor starts acquiring a light reception result synchronously with a change in the trigger signal.

[0228] According to this method, the trigger signal is changed based on the voltage level of the scanner position signal, and the image sensor starts acquiring the light reception result synchronously with the change in the trigger signal, thereby simplifying the structure of the ophthalmic device while synchronizing the optical scanner and the image sensor with high precision.

[0229] Some embodiments include: a second output step in which a control unit outputs a scanner control signal (Scont) to the optical scanner, and the optical scanner deflects the illumination light at a deflection angle corresponding to the scanner control signal.

[0230] According to this method, a scanner position signal corresponding to the deflection angle can be generated by the scanner control signal, thereby enabling the image sensor to start acquiring the light reception result synchronously with the scanner control signal of the control unit.

[0231] Some embodiments include: a light source control step of switching the light source from an on state to an off state or from an off state to an on state synchronously with the scanner position signal.

[0232] According to this method, while simplifying the structure of the ophthalmic device, the optical scanner, the image sensor, and the light source can be synchronized with high precision, thereby preventing the acquisition of the light reception result of unnecessary scattered light and obtaining a high-quality image of the eye to be examined formed based on the light reception result of the image sensor.

[0233] In some embodiments, it includes: a second voltage detection step of changing a light source control signal (LScont) for controlling the turning on and off of the light source according to a comparison result between the scanner position signal and a second threshold voltage (TH2, a third threshold voltage TH3), and in the light source control step, the light source is switched from an on state to an off state or from an off state to an on state synchronously with a change in the light source control signal.

[0234] According to this method, the light source control signal is changed based on the voltage level of the scanner position signal, and the turning on and off of the light source is controlled synchronously with the change in the light source control signal, thereby simplifying the structure of the ophthalmic device while synchronizing the scanner, the image sensor, and the light source with high precision.

[0235] In some embodiments, in the light reception result acquisition step, the image sensor starts acquiring the light reception result during the period when the light source is in the on state and ends acquiring the light reception result.

[0236] According to this method, the influence of unnecessary scattered light can be reliably eliminated, and the image quality of the eye to be examined can be further improved.

[0237] In some embodiments, the image sensor is a CMOS image sensor.

[0238] According to this method, while simplifying the structure of the ophthalmic device, the optical scanner and the image sensor can be synchronized with high precision at low cost.

[0239] Some embodiments relate to a program for causing a computer to execute each step of the control method of the ophthalmic device according to any one of the above.

[0240] According to this program, the optical scanner and the image sensor can be synchronized with high precision with a simple structure, thereby preventing the acquisition of the light reception result of unnecessary scattered light and obtaining a high-quality image of the eye to be examined formed based on the light reception result of the image sensor.

[0241] The above embodiments or their modifications are merely examples for implementing the present invention. Those who intend to implement the present invention can make any deformations, omissions, additions, etc. within the scope of the gist of the present invention.

[0242] In the above embodiments, the ophthalmic device can, for example, have any function applicable to the ophthalmic field, such as an axial length measurement function, an intraocular pressure measurement function, an optical coherence tomography (OCT) function, an ultrasonic examination function, etc. In addition, the axial length measurement function can be realized by an optical coherence tomograph or the like. Further, the axial length measurement function can also be realized by projecting light onto the eye to be examined, detecting the return light from the fundus while adjusting the position of the optical system in the Z direction (front-rear direction) with respect to the eye to be examined, and thereby measuring the axial length of the eye to be examined. The intraocular pressure measurement function is realized by an intraocular pressure meter 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 device or the like. The present invention can also be applied to a device (composite machine) having two or more such functions.

[0243] In some embodiments, a program for causing a computer to execute the control method of the ophthalmic device is provided. Such a program can be stored in any non-transitory recording medium readable by a computer. The recording medium can be an electronic medium using magnetism, light, magneto-optics, semiconductors, etc. Typically, the recording medium is a magnetic tape, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, a solid state drive, etc. Additionally, the program can be sent and received through a network such as the Internet or a local area network (LAN).

[0244] Description of Reference Numerals

[0245] 1: Ophthalmic device

[0246] 10: Light source

[0247] 20: Illumination optical system

[0248] 21: Iris diaphragm

[0249] 22: Slit

[0250] 23, 41, 44, 48: Relay lens

[0251] 30: Light scanner

[0252] 35: Projection optical system

[0253] 40: Imaging optical system

[0254] 42: Black dot plate

[0255] 43: Mirror

[0256] 45: Aperture lens

[0257] 46: Objective lens

[0258] 47: Focusing lens

[0259] 49: Imaging lens

[0260] 50: Imaging device

[0261] 51: Image sensor

[0262] 100: Control unit

[0263] 101: Main control unit

[0264] 102: Storage unit

[0265] 210, 210a: Voltage detection circuit

[0266] 211a: First voltage detection circuit

[0267] 212a: Second voltage detection circuit

[0268] LScont: Light source control signal

[0269] Scont: Scanner control signal

[0270] Spos: Scanner position signal

[0271] TH1: First threshold voltage

[0272] TH2: Second threshold voltage

[0273] TH3: Third threshold voltage

[0274] E: Eye to be examined

[0275] Ef: Fundus

Claims

1. An ophthalmic device, characterized in that, Comprising: A light source; An illumination optical system, including a slit configured to be movable in the optical axis direction according to the state of the eye to be examined, and generating slit-shaped illumination light by irradiating the light from the light source onto the slit; A light scanner that deflects the illumination light and guides the illumination light to the fundus of the eye to be examined; An imaging optical system that guides the return light of the illumination light from the fundus to an image sensor, and the image sensor acquires the light reception result of the area of the light reception surface corresponding to the illumination area of the illumination light in the fundus moved by the light scanner in a rolling shutter manner; And A control unit that controls the deflection angle of the illumination light by the light scanner, The ophthalmic device can change at least one of the relative position and relative orientation of the light source with respect to the slit as the slit moves, The light scanner outputs a scanner position signal corresponding to the deflection angle of the illumination light, The image sensor starts acquiring the light reception result of the return light synchronously with the scanner position signal.

2. The ophthalmic device according to claim 1, wherein The ophthalmic device includes: A first voltage detection circuit that changes a trigger signal according to the comparison result between the scanner position signal and a first threshold voltage, The image sensor starts acquiring the light reception result synchronously with the change of the trigger signal.

3. The ophthalmic device according to claim 1 or 2, wherein The control unit outputs a scanner control signal to the light scanner and deflects the illumination light at a deflection angle corresponding to the scanner control signal.

4. The ophthalmic device according to claim 1 or 2, wherein The light source is switched from an on state to an off state or from an off state to an on state synchronously with the scanner position signal.

5. The ophthalmic device according to claim 4, wherein The ophthalmic device includes: A second voltage detection circuit that changes a light source control signal for controlling the turning on and off of the light source according to the comparison result between the scanner position signal and a second threshold voltage, The light source is switched from an on state to an off state or from an off state to an on state synchronously with the change of the light source control signal.

6. The ophthalmic device according to claim 5, wherein The image sensor starts acquiring the light reception result during the period when the light source is in the on state and ends acquiring the light reception result.

7. The ophthalmic device according to claim 1 or 2, wherein The image sensor is a CMOS image sensor.

8. A control method for an ophthalmic device, wherein The ophthalmic device includes: A light source; An illumination optical system, including a slit configured to be movable in the optical axis direction according to the state of the eye to be examined, and generating slit-shaped illumination light by irradiating the light from the light source onto the slit; A light scanner that deflects the illumination light and guides the illumination light to the fundus of the eye to be examined; An imaging optical system that guides the return light of the illumination light from the fundus to an image sensor, and the image sensor acquires, in a rolling shutter manner, a light reception result of a region of a light reception surface corresponding to an illumination region of the illumination light in the fundus that is moved by the light scanner; and A control unit that controls the deflection angle of the illumination light by the light scanner, The ophthalmic device is capable of changing at least one of the relative position and the relative orientation of the light source with respect to the slit as the slit moves, The control method of the ophthalmic device includes: A first output step in which the light scanner outputs a scanner position signal corresponding to the deflection angle of the illumination light; and A light reception result acquisition step in which the image sensor starts acquiring the light reception result of the return light in synchronization with the scanner position signal.

9. The control method of the ophthalmic device according to claim 8, characterized in that The control method of the ophthalmic device includes: A first voltage detection step of changing a trigger signal based on a comparison result between the scanner position signal and a first threshold voltage, In the light reception result acquisition step, the image sensor starts acquiring the light reception result in synchronization with the change of the trigger signal.

10. The control method of the ophthalmic device according to claim 8 or 9, characterized in that The control method of the ophthalmic device includes: A second output step in which the control unit outputs a scanner control signal to the light scanner, The light scanner deflects the illumination light at a deflection angle corresponding to the scanner control signal.

11. The control method of the ophthalmic device according to claim 8 or 9, characterized in that The control method of the ophthalmic device includes: A light source control step of switching the light source from an on state to an off state or from an off state to an on state in synchronization with the scanner position signal.

12. The control method of the ophthalmic device according to claim 11, characterized in that The control method of the ophthalmic device includes: A second voltage detection step of changing a light source control signal for controlling the turning on and off of the light source based on a comparison result between the scanner position signal and a second threshold voltage, In the light source control step, the light source is switched from an on state to an off state or from an off state to an on state in synchronization with the change of the light source control signal.

13. The control method of the ophthalmic device according to claim 12, characterized in that In the light reception result acquisition step, the image sensor starts and ends acquiring the light reception result while the light source is in an on state.

14. The control method of the ophthalmic device according to claim 8 or 9, characterized in that The image sensor is a CMOS image sensor.

15. A recording medium, characterized in that A program is stored in the recording medium, and the program causes a computer to execute each step of the control method of the ophthalmic device according to any one of claims 8 to 14.

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