JP2022072499A - Ophthalmologic apparatus, control method of ophthalmologic apparatus and program - Google Patents

Abstract

To provide a new technique for easily acquiring a high-quality image of a subject eye even when a field angle is large.SOLUTION: An ophthalmologic apparatus comprises: an irradiation system; a light reception system; a control unit; and an image formation unit. The irradiation system irradiates an illumination range that rotates around the imaging center in a prescribed portion of a subject eye with illumination light. The light reception system includes an image sensor in which the light reception surface can be arranged at a position optically substantially conjugate with the prescribed portion and receives return light of the illumination light irradiated to the illumination range. The control unit controls the irradiation system and the light reception system so as to execute the center part scan to scan the center part including the imaging center with the illumination light and one or more peripheral part scans to scan each of one or more peripheral parts on the outer side of the center part with the illumination light. The image formation unit forms an image of the subject eye on the basis of the light reception result of the return light obtained with the center part scan and the light reception result of the return light obtained with the one or more peripheral part scans.SELECTED DRAWING: Figure 1

Description

The present invention relates to an ophthalmic apparatus, a control method for the ophthalmic apparatus, and a program.

The scanning laser ophthalmoscope (SLO) scans the inside of the eyeball with a laser beam and detects the reflected light from the fundus to acquire a fundus image.

When a wide-angle fundus image is acquired using such an SLO, it is affected by aberrations of the eyeball optical system as described in Non-Patent Document 1, and the focus is on the outer peripheral portion outside the central portion including the imaging center. Misalignment occurs. This means that when the focus is on the central portion, the deterioration of the image quality on the outer peripheral portion becomes remarkable.

For example, in Patent Document 1, in a fundus tomographic image capturing device that scans the fundus with measured light using an optical scanner, a tomographic image is acquired with the same sensitivity by adjusting the optical path for each imaging position of each circle scan. , A method for acquiring a sensitive tomographic image in the entire imaging region is disclosed.

Further, when acquiring a fundus image using SLO, it is known that an artifact caused by a reflection component from the center of the objective lens may be visualized on the fundus image.

For example, Patent Document 2 describes a method of removing artifacts caused by a reflection component from the center of an objective lens by appropriately setting the size of a dead zone between an irradiation zone and a detection zone on a pupil division surface. Is disclosed.

Japanese Unexamined Patent Publication No. 2013-081763 US Pat. No. 10,582,852

David A. Atchison, "Interior Coloneal and international aberrations to peripheral aberrations of human eyes", Optical Society of America, March 2004, Vol. 21, No. 3, pp. 355-359

For example, as in Patent Document 1, when performing a circle scan in SLO and adjusting the focus for each shooting position in the central portion including the imaging center and the peripheral portion outside the central portion, it takes time to adjust the focus. Image quality deteriorates due to movement of the eye to be inspected. Further, when scanning the fundus with light having a predetermined cross-sectional shape such as a line shape, the focus position is different between the region including the imaging center and the region away from the imaging center in the illumination region of the fundus. Therefore, it is difficult to avoid deterioration of image quality due to aberration of the eyeball optical system. The larger the angle of view, the greater the degree of deterioration in image quality due to aberrations in the eyeball optical system.

On the other hand, although the method disclosed in Patent Document 2 can remove artifacts caused by a reflection component from the center of the objective lens, deterioration of image quality due to aberrations of the eyeball optical system cannot be avoided.

As described above, it is difficult to easily obtain a high-quality image of the eye to be inspected by the conventional method even if the angle of view is large.

The present invention has been made in view of such circumstances, and one of the objects thereof is to provide a new technique for easily acquiring a high-quality image of an eye to be inspected even when the angle of view is large. To do.

The first aspect according to the embodiment is an irradiation system that irradiates an illumination range that rotates around a imaging center in a predetermined portion of the eye to be inspected, and a light receiving surface is arranged at a position that is optically coupled to the predetermined portion. A light receiving system that includes a possible image sensor and receives the return light of the illumination light radiated to the illumination range, a central scan that scans the central portion including the imaging center with the illumination light, and a central portion of the central portion. Obtained by the central scan and a control unit that controls the irradiation system and the light receiving system to perform one or more peripheral scans that scan each of the outer one or more peripherals with the illumination light. It is an ophthalmic apparatus including an image forming unit that forms an image of the eye to be inspected based on the light receiving result of the return light and the light receiving result of the return light obtained by scanning one or more peripheral portions.

In the second aspect according to the embodiment, in the first aspect, the control unit has a difference between the light amount of the return light obtained by the central scan and the light amount of the return light obtained by one or more peripheral scans. At least one of the irradiation system and the light receiving system is controlled so that

In the third aspect according to the embodiment, in the first aspect or the second aspect, the irradiation system and the light receiving system can move in the direction of the photographing optical axis.

The fourth aspect according to the embodiment includes, in any one of the first to third aspects, a lens arranged in the optical path of the irradiation system and the optical path of the light receiving system and movable along the optical path.

In the fifth aspect according to the embodiment, in any one of the first to fourth aspects, a hole is formed at a position eccentric from the optical axis for photographing, and the optical path of the irradiation system and the optical path of the light receiving system are coupled. The hole portion includes the pupil division rotation mirror, and the hole portion can be arranged at a position optically conjugate with the pupil of the eye to be inspected, and the pupil division rotation mirror is such that the photographing light is synchronized with the movement of the illumination range. The hole can be rotated around the shaft.

In the sixth aspect according to the embodiment, in the fifth aspect, two or more slits are formed so as to be rotatable about the optical axis of photography and can be selectively arranged in the optical path connected by the pupil split rotating mirror. The two or more slits include a first slit in which a slit is formed in the central region through which the optical axis of photography passes, and one or more peripheral regions outside the central region in which the optical axis of photography passes. The slit formed in the first slit, including the one or more second slits formed therein, can be arranged at a position optically conjugate with the central portion, and is formed in the one or more second slits. The slit can be arranged at a position optically coupled to the one or more peripheral portions in the predetermined portion.

A seventh aspect according to the embodiment is, in the fifth aspect, an optical path dividing member that divides an optical path coupled by the pupil division rotating mirror into two or more optical paths, and the two or more optical paths divided by the optical path dividing member. Two or more slits arranged in each of the above and having a rotatable slit about the shooting optical axis are combined with the two or more optical paths divided by the optical path dividing member, and the light of the combined optical path is emitted. The two or more slits include an optical path coupling member leading to the eye to be inspected, and the two or more slits include a first slit in which a slit is formed in a central region through which the photographing optical axis passes, and one outside the central region through which the photographing optical axis passes. The slits formed in the first slits include one or more second slits in which slits are formed in each of the above peripheral regions, and the slits formed in the first slits can be arranged at positions optically coupled to the central portion. The slits formed in the one or more second slits can be arranged at positions optically coupled to the one or more peripheral portions in the predetermined portion.

An eighth aspect according to the embodiment is, in the fifth aspect, two or more slits in which slits are formed and can be selectively arranged in an optical path coupled by the pupil division rotation mirror, the pupil division rotation mirror and the second aspect. Includes an optical scanner arranged between the above slits and deflecting light that has passed through a slit formed in any of the two or more slits so as to rotate about the imaging center at the predetermined portion. The two or more slits are the first slit in which the slit is formed in the central region through which the photographing optical axis passes, and the slit is formed in each of one or more peripheral regions outside the central region through which the photographing optical axis passes. The slit formed in the first slit including one or more second slits can be arranged at a position optically conjugate with the central portion, and is formed in the one or more second slits. The slit can be arranged at a position optically coupled to the one or more peripheral portions in the predetermined portion.

In the ninth aspect according to the embodiment, in any one of the sixth to eighth aspects, the two or more slits are movable in the direction of the photographing optical axis except for one of the two or more slits. Is.

In the tenth aspect according to the embodiment, in any one of the sixth aspect to the ninth aspect, each of the one or more second slits is moved in the direction of the photographing optical axis based on the refractive power of the eye to be inspected. Includes one or more moving mechanisms.

In the eleventh aspect according to the embodiment, in any one of the sixth aspect to the tenth aspect, each of the one or more second slits is moved in the direction of the photographing optical axis based on the OCT data of the eye to be inspected. Includes one or more moving mechanisms.

In the twelfth aspect according to the embodiment, in any one of the sixth aspect to the eleventh aspect, the slits formed in each of the two or more slits are formed so as to become wider as the distance from the photographing optical axis increases. ..

In the thirteenth aspect according to the embodiment, in the twelfth aspect, the slits formed in each of the two or more slits have a substantially trapezoidal shape or a triangular shape.

A fourteenth aspect according to the embodiment is an irradiation step of irradiating an illumination range that rotates around a imaging center in a predetermined portion of the eye to be inspected, and a position where the light receiving surface is optically coupled to the predetermined portion. A light receiving step that receives the return light of the illumination light radiated to the illumination range using a possible image sensor, a central scan that scans the central portion including the imaging center with the illumination light, and the central portion. A control step for executing one or more peripheral scans in which each of the one or more peripheral portions outside the above is scanned with the illumination light, a light receiving result of the return light obtained by the central scan, and the one or more. It is a control method of an ophthalmologic apparatus including an image formation step of forming an image of the eye under test based on the light receiving result of the return light obtained by scanning the peripheral portion of the eye.

In the fifteenth aspect according to the embodiment, in the fourteenth aspect, in the control step, the difference between the light amount of the return light obtained by the central scan and the light amount of the return light obtained by one or more peripheral scans. At least one of the irradiation system that irradiates the illumination light and the light receiving system that receives the return light is controlled so that

In the 16th aspect according to the embodiment, in the 14th aspect or the 15th aspect, in the ophthalmologic apparatus, a hole is formed at a position eccentric from the photographing optical axis, and the optical path of the irradiation system irradiating the illumination light and the return. A pupil split rotating mirror that couples with an optical path of a light receiving system that receives light is included, and the hole portion can be arranged at a position optically conjugate with the pupil of the eye to be inspected, and the control step is the illumination. The pupil division rotation mirror is controlled so as to rotate the hole portion around the photographing optical axis in synchronization with the movement of the range.

In the 17th aspect according to the embodiment, in the 16th aspect, the ophthalmologic apparatus is formed with a slit rotatable about an optical axis for imaging, and can be selectively arranged in an optical path coupled by the pupil split rotating mirror. The two or more slits include two or more slits, the first slit having a slit formed in the central region through which the photographing optical axis passes, and one or more peripheral regions outside the central region through which the photographing optical axis passes. The slit formed in the first slit includes one or more second slits each having a slit formed therein, and the slit formed in the first slit can be arranged at a position optically coupled to the central portion thereof, and the one or more slits can be arranged. The slit formed in the second slit can be arranged at a position optically coupled to the one or more peripheral portions in the predetermined portion.

In the eighteenth aspect of the embodiment, in the sixteenth aspect, the ophthalmologic apparatus is divided into an optical path dividing member that divides an optical path coupled by the pupil division rotating mirror into two or more optical paths, and the optical path dividing member. The two or more optical paths arranged in each of the two or more optical paths and having a rotatable slit about the photographing optical axis formed, and the two or more optical paths divided by the optical path dividing member are combined and combined. The two or more slits include a first slit formed in a central region through which the photographing optical axis passes, and a center through which the photographing optical axis passes, including an optical path coupling member that guides the light of the optical path to the eye to be inspected. The slit formed in the first slit includes one or more second slits in which slits are formed in each of the one or more peripheral regions outside the region, and the slits formed in the first slit are located at positions optically coupled to the central portion. The slits formed in the one or more second slits can be arranged at positions optically coupled to the one or more peripheral portions in the predetermined portion.

In the nineteenth aspect according to the embodiment, in the sixteenth aspect, the ophthalmologic apparatus has two or more slits in which slits are formed and can be selectively arranged in an optical path coupled by the pupil division rotation mirror, and the pupil division. Light that is arranged between the rotating mirror and the two or more slits and deflects light that has passed through a slit formed in any of the two or more slits so as to rotate about the imaging center at the predetermined portion. The two or more slits, including the scanner, are provided in the first slit in which the slit is formed in the central region through which the photographing optical axis passes, and in one or more peripheral regions outside the central region through which the photographing optical axis passes. The slit formed in the first slit includes one or more second slits in which the slits are formed, and the slits formed in the first slit can be arranged at a position optically conjugate with the central portion, and the first or more second slits can be arranged. The slit formed in the slit can be arranged at a position optically coupled to the one or more peripheral portions in the predetermined portion.

In the 20th aspect according to the embodiment, in any one of the 17th to 19th aspects, the slits formed in each of the two or more slits are formed so as to become wider as the distance from the photographing optical axis increases. ..

In the 21st aspect according to the embodiment, in the 20th aspect, the slits formed in each of the two or more slits have a substantially trapezoidal shape or a triangular shape.

In the 22nd aspect according to the embodiment, the program causes a computer to execute each step of the control method of the ophthalmic apparatus according to any one of the 14th aspect to the 21st aspect.

It is possible to arbitrarily combine the configurations according to the above-mentioned plurality of aspects.

According to the present invention, it is possible to provide a new technique for easily acquiring a high-quality image of an eye to be inspected even when the angle of view is large.

It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram for demonstrating the operation of the ophthalmic apparatus which concerns on the comparative example of 1st Embodiment. It is a schematic diagram for demonstrating the operation of the ophthalmic apparatus which concerns on the comparative example of 1st Embodiment. It is a schematic diagram for demonstrating the operation of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram for demonstrating the operation of the ophthalmic apparatus which concerns on 1st Embodiment. It is a flowchart which shows an example of the operation of the ophthalmologic apparatus which concerns on 1st Embodiment. It is a flowchart which shows an example of the operation of the ophthalmologic apparatus which concerns on 1st Embodiment. It is a schematic diagram for demonstrating the operation of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 2nd Embodiment. It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 3rd Embodiment. It is a schematic diagram which shows an example of the structure of the ophthalmic apparatus which concerns on 3rd Embodiment. It is a flowchart which shows an example of the operation of the ophthalmologic apparatus which concerns on 3rd Embodiment. It is a flowchart which shows an example of the operation of the ophthalmologic apparatus which concerns on 3rd Embodiment.

An example of the ophthalmic apparatus, the control method of the ophthalmic apparatus, and the embodiment of the program according to the present invention will be described in detail with reference to the drawings. In the embodiment, the technique described in the document cited in this specification can be arbitrarily used.

The ophthalmic apparatus according to the embodiment is a scanning laser ophthalmoscope (SLO) that scans a predetermined portion of the eye to be inspected with illumination light and forms a front image of the eye to be inspected based on the result of receiving the return light of the illumination light from the predetermined portion. ) Has the function. The SLO includes a point scan SLO that scans a predetermined portion with spot-shaped light and a line scan SLO that scans a predetermined portion with line-shaped light. The configuration according to the following embodiment is applicable to both the point scan SLO and the line scan SLO.

Specifically, the ophthalmic appliance performs a central scan and one or more peripheral scans. In the central scan, the central portion including the imaging center that can be arbitrarily set in a predetermined portion of the eye to be inspected is scanned with illumination light so that the illumination range rotates around the imaging center. In one or more peripheral scans, each of the one or more peripherals (eg, annular or arcuate) outside the central part of the predetermined area of the eye to be inspected is illuminated by illumination light so that the illumination range rotates around the center of imaging. It will be scanned. The ophthalmologic apparatus forms an image of the eye to be inspected based on the light reception result of the return light obtained by the central scan and the light reception result of the return light obtained by one or more peripheral scans.

This makes it possible to scan the central portion of the predetermined portion of the eye to be inspected and one or more peripheral portions with illumination light whose focus positions are adjusted independently of each other. As a result, even when the angle of view is large, it is possible to easily obtain an image of the eye to be in focus over the entire predetermined portion.

Further, the ophthalmologic apparatus scans the central portion with the illumination light (center scan) so that the illumination range rotates around the imaging center at the predetermined portion. As a result, the intensity of the reflection component from the center of the objective lens or the like can be weakened, and the artifact caused by the reflection component can be removed. Therefore, even when the angle of view is large, it is possible to easily acquire a high-quality image of the eye to be inspected.

As an example of the center of photography, there is a position that intersects the optical axis of the imaging system (for example, the optical axis of the irradiation system that irradiates the illumination light, the optical axis of the light receiving system that receives the return light of the illumination light) at a predetermined part of the eye to be inspected. .. Examples of predetermined parts of the eye to be inspected include the fundus and the anterior eye.

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

In the present specification, the processor is, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an ASIC (Application Specific Integrated Circuit), a programmable logic device (for example, a SPLD (Simple Includes circuits such as Logic Devices), FPGAs (Field Processor Gate Array)). The processor realizes the function according to the embodiment by reading and executing, for example, a program stored in a storage circuit or a storage device. A storage circuit or storage device may be included in the processor. Further, a storage circuit or a storage device may be provided outside the processor.

The ophthalmic apparatus according to some embodiments has a function of projecting a fixative on the fundus. As the fixative, an internal fixative or an external fixative can be used.

Hereinafter, the case where the ophthalmic apparatus acquires an image of the fundus of the eye to be inspected will be described, but the configuration according to the embodiment is not limited to this. The ophthalmic apparatus according to the embodiment can also be applied to acquire an image of a predetermined part (for example, anterior eye portion) of the eye to be inspected other than the fundus.

Hereinafter, unless otherwise specified, the left-right direction is the X direction, the vertical direction is the Y direction, and the front-back direction (depth direction) is the Z direction when viewed from the subject. The X, Y and Z directions define a three-dimensional Cartesian coordinate system.

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

The ophthalmologic apparatus 1 according to the first embodiment scans the fundus Ef with illumination light so that the illumination range of a predetermined shape rotates around the image pickup center that can be arbitrarily set in the fundus Ef of the eye to be inspected E, and scans the fundus Ef from the fundus Ef. An image of the fundus Ef is acquired by receiving the illumination light of.

The ophthalmic appliance 1 includes an optical system (device optical system) 10, a control unit 100, a data processing unit 200, an operation unit 110, a display unit 120, moving mechanisms 10D, 50D, 70D, and rotation mechanisms 40R, 50R. And include.

The optical system 10 scans the fundus Ef with the illumination light so that the illumination region having a predetermined shape rotates around the center of photography.

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

The objective lens 11 is on the coupled optical path of the optical path (observation optical axis, observation optical path) of the anterior segment observation optical system 20 and the optical path (photographing optical axis, photographing optical path) of the photographing optical system 70 so as to face the eye to be inspected E. Is placed in. Here, the observation optical axis corresponds to the optical axis in which the image sensor in the anterior eye observation optical system 20 is arranged. The photographing optical axis corresponds to the optical axis (or the optical axis along the optical path of the illumination light) in which the image sensor 60 in the photographing optical system 70 is arranged.

The optical element M1 combines the optical path of the anterior segment observation optical system 20 with the optical path of the optical system (photographing optical system 70, rotating slit 50), and the optical path of the return light from the eye E to be inspected is the anterior eye. The optical path of the part observation optical system 20 and the optical path of other optical systems are separated. It is desirable that the optical element M1 couples these optical systems so that the optical axis of the anterior segment observation optical system 20 is substantially coaxial with the optical axes of the other optical systems.

For example, the optical element M1 is a beam splitter (polarization beam splitter, half mirror), a dichroic mirror, or a dichroic beam splitter.

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

(Anterior eye observation optical system 20)
The anterior eye portion observation optical system 20 is used for observing the anterior segment of the eye to be inspected E illuminated by the illumination light. The anterior eye observation optical system 20 includes an illumination optical system for anterior eye observation.

The anterior eye observation optical system 20 includes at least one of an eyepiece and an image sensor. The eyepiece is used for macroscopic observation of the eye E to be inspected. The image sensor is used to acquire a frontal image of the anterior eye portion of the eye E to be inspected. The image acquired by using the image sensor is displayed on the display device of the display unit 120 by the control unit 100 receiving the detection signal from the image sensor and controlling the display unit 120.

For example, the illumination light from the front eye portion illumination light source (not shown) passes through the optical element M1 and is guided to the front eye portion via the objective lens 11. In some embodiments, the illumination light from an anterior eye illumination light source (not shown) directly illuminates the anterior segment of the eye E to be inspected.

The return light (reflected light) of the illumination light from the eye E to be inspected passes through the objective lens 11, passes through the optical element M1, and is guided to the anterior segment observation optical system 20.

(Shooting optical system 70)
The photographing optical system 70 is used for photographing the fundus Ef of the eye to be inspected E illuminated by the illumination light. The photographing optical system 70 includes an illumination optical system 30, a pupil division rotation mirror 40, and an image sensor 60.

The irradiation system in the photographing optical system 70 (optical system 10) includes an illumination optical system 30 and a rotary slit 50. The light receiving system in the photographing optical system 70 (optical system 10) includes an image sensor 60. The pupil division rotation mirror 40 couples the optical path of the irradiation system and the optical path of the light receiving system.

(Eye division rotation mirror 40)
The pupil division rotation mirror 40 is arranged on the imaging optical axis, and a hole is formed in the pupil (pupil) of the eye E to be examined so as to divide the illumination light and the return light into pupils, and the illumination light from the illumination optical system 30 is formed. The optical path and the optical path of the return light of the illumination light from the eye E to be inspected are combined. The pupil division rotation mirror 40 is configured to be rotatable about the photographing optical axis in a state of being obliquely arranged with respect to the photographing optical axis, and a hole portion is formed at a position eccentric from the rotation center. That is, the pupil division rotation mirror 40 is configured so that the hole portion can be rotated around the photographing optical axis with the axis intersecting the photographing optical axis as the rotation axis. The hole portion of the pupil division rotation mirror 40 can be arranged at a position optically conjugate with the pupil (iris) of the eye E to be inspected. The pupil division rotation mirror 40 can be moved in the direction of the photographing optical axis by a moving mechanism (moving mechanism 10D or moving mechanism 70D) that moves the entire optical system, or a moving mechanism (not shown).

For example, the illumination optical system 30 (irradiation system) is arranged in the reflection direction of the pupil division rotation mirror 40, and the image sensor 60 (light receiving system) is arranged in the passage direction of the pupil division rotation mirror 40. In this case, the illumination light from the illumination optical system 30 is reflected toward the eye to be inspected E by the mirror formed in the peripheral portion of the hole, and the return light of the illumination light from the eye to be inspected E passes through the hole and is imaged. The pupil division rotation mirror 40 is arranged on the photographing optical axis so as to be guided by the sensor 60.

For example, the illumination optical system 30 (irradiation system) is arranged in the passing direction of the pupil division rotation mirror 40, and the image sensor 60 (light receiving system) is arranged in the reflection direction of the pupil division rotation mirror 40. In this case, the illumination light from the illumination optical system 30 passes through the hole portion, and the return light of the illumination light from the eye E to be inspected is reflected toward the image sensor 60 by the mirror formed in the peripheral portion of the hole portion. In addition, the pupil division rotation mirror 40 is arranged on the photographing optical axis.

Such a pupil split rotation mirror 40 functions as an aperture diaphragm.

As shown in FIG. 1, the pupil division rotation mirror 40 is not limited to the one obliquely provided with respect to the photographing optical axis. For example, the function of the pupil division rotation mirror 40 may be realized by the pupil division member and the mirror.

(Illumination optical system 30)
The illumination optical system 30 illuminates the anterior segment of the eye to be inspected E or the fundus Ef. The illumination optical system 30 includes an illumination light source, a lens, and the like.

For example, the illumination light generated by the illumination optical system 30 is reflected at the peripheral portion of the hole portion of the pupil split rotation mirror 40, passes through the slit formed in the rotation slit 50, is reflected by the optical element M1, and is reflected by the objective lens. It passes through 11 and is guided to the eye E to be inspected.

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

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

The light receiving surface of the return light in the image sensor 60 can be arranged at a position optically conjugate with the fundus Ef (photographing center) of the eye E to be inspected. In some embodiments, the light receiving surface of the image sensor 60 is located between the center of the fundus Ef and one or more peripherals (eg, the position between the center of imaging and the outermost position of the imaging range). It can be placed at a position that is optically conjugate with.

In some embodiments, the image sensor 60 comprises a return light of illumination light from a central portion obtained by a central scan described below and an illumination light from one or more peripheral portions obtained by a peripheral scan described below. It is configured to receive the return light of.

In some embodiments, the image sensor 60 comprises a return light of the illumination light from the central portion obtained by the central scan described later and a return light of the illumination light from the peripheral portion obtained by the peripheral scan described later. It is configured to receive light independently in a time division manner.

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

(Rotating slit 50)
The rotary slit 50 is formed with a slit for scanning the central portion and a slit for scanning one or more peripheral portions. The slit for scanning the central portion is used to irradiate the central portion including the imaging center in the fundus Ef with illumination light. One or more peripheral scan slits are used to irradiate each of the one or more peripherals outside the central part of the fundus Ef with illumination light.

The rotation slit 50 is configured to be rotatable about a predetermined rotation axis substantially parallel to the photographing optical axis. Hereinafter, the rotary slit 50 is configured to be rotatable about the photographing optical axis. That is, the rotary slit 50 is configured to be rotatable around two or more slits about the shooting optical axis.

The slit for scanning the central portion formed in the rotary slit 50 can be arranged at a position optically conjugate with the central portion including the imaging center in the fundus Ef. Each of the one or more peripheral scan slits formed in the rotary slit 50 is optically conjugate with one or more peripheral portions (representative positions of the peripheral portions) outside the central portion including the imaging center in the fundus Ef. Can be placed in any position. For example, the representative position of the peripheral portion is the position closest to the photographing center at the boundary of the peripheral portion and the position farthest from the photographing center at the boundary of the peripheral portion. The representative position of the peripheral portion is the center position or the center of gravity position of the position where the straight line passing through the imaging center intersects the boundary on the imaging center side of the peripheral portion and the position where the straight line passes through the outer boundary of the peripheral portion. good.

When the illumination optical system 30 is arranged in the reflection direction of the pupil division rotation mirror 40 and the image sensor 60 is arranged in the passage direction of the pupil division rotation mirror 40, the rotation slit 50 is around the hole portion of the pupil division rotation mirror 40. The illumination light from the illumination optical system 30 reflected by the mirror formed in the portion is rotated so as to pass through the slit for scanning the central portion or the slit for scanning the peripheral portion. In other words, in the rotary slit 50, the return light of the illumination light applied to the eye E to be inspected passes through the slit for scanning the central portion or the slit for scanning the peripheral portion, and is formed on the pupil split rotating mirror 40. It is rotated so as to pass through the hole and be guided by the image sensor 60.

When the illumination optical system 30 is arranged in the passing direction of the pupil division rotation mirror 40 and the image sensor 60 is arranged in the reflection direction of the pupil division rotation mirror 40, the rotation slit 50 receives the illumination light from the illumination optical system 30 in the pupil. It is rotated so as to pass through the hole formed in the split rotation mirror 40 and to pass through the slit for scanning the central portion or the slit for scanning the peripheral portion. In other words, in the rotary slit 50, the return light of the illumination light applied to the eye E to be inspected passes through the slit for scanning the central portion or the slit for scanning the peripheral portion, and the peripheral portion of the hole portion of the pupil split rotating mirror 40. It is rotated so as to be reflected by the mirror formed in the image sensor 60 and guided to the image sensor 60.

In some embodiments, the rotary slit 50 comprises two or more rotary slits. In this case, the rotary slit 50 includes a central rotary slit for central scan and one or more peripheral rotary slits for peripheral scan for each of the one or more peripheral portions. The slit formed in the central rotation slit can be arranged at a position optically conjugate with the central portion of the fundus Ef. The slits formed in each of the one or more peripheral rotation slits can be arranged at positions optically conjugate with each of the one or more peripheral portions in the fundus Ef.

(Control unit 100)
The control unit 100 includes an optical system 10, moving mechanisms 10D, 50D, 70D, rotation mechanisms 40R, 50R, a data processing unit 200, an operation unit 110, a display unit 120, and an anterior eye observation optical system 20. To control.

The control unit 100 includes a control unit (controller) 101 and a storage unit 102. The function of the control unit 101 is realized by the processor. A computer program for controlling the ophthalmic appliance 1 is stored in the storage unit 102 in advance. This computer program includes a light source control program, a rotation control program for the pupil division rotation mirror 40, a rotation control program for the rotation slit 50, a control program for the image sensor 60, and a control for the anterior segment observation optical system 20. A program, a control program for the mobile mechanisms 10D, 50D, and 70D, a data processing program, a user interface program, and the like are included. When the control unit 101 operates according to such a computer program, the control unit 100 executes the control process.

The control for the optical system 10 includes a control for the illumination optical system 30, a control for the image sensor 60, and the like. The control for the illumination optical system 30 includes switching between turning on and off the light source, controlling the amount of light, and the like. The control for the image sensor 60 includes an aperture range control, an exposure adjustment of the light receiving element, a gain adjustment of the light receiving element, and a light receiving rate adjustment.

The control for the moving mechanism 10D includes the movement control of the optical system 10. The control for the moving mechanism 50D includes the movement control of the rotary slit 50 and the like. Controls for the moving mechanism 70D include movement control of the photographing optical system 70.

The control for the rotation mechanism 40R includes rotation control of the pupil split rotation mirror 40 (rotation speed control, rotation control in a desired rotation angle range, rotation to a desired rotation start angle, rotation stop at a desired rotation end angle), and the like. There is. The control for the rotation mechanism 50R includes rotation control (rotation speed control, rotation control in a desired rotation angle range, rotation to a desired rotation start angle) of the rotation slit 50 (central rotation slit or peripheral rotation slit described later). Rotation stop at the desired rotation end angle) and the like. The rotation mechanisms 40R and 50R are controlled so that the rotation of the pupil division rotation mirror 40 and the rotation of the rotation slit 50 are synchronized.

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

The control for the operation unit 110 includes the reception control of the operation content for the operation unit 110 and the like. Controls for the display unit 120 include display control using a display unit.

The storage unit 102 stores various types of data. The data stored in the storage unit 102 includes an image of the fundus Ef acquired by using the image sensor 60, eye examination information, and the like. The eye test information includes subject information such as patient ID and name, left eye / right eye identification information, electronic medical record information, and the like.

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

For example, the data processing unit 200 forms a frontal image of the central portion of the fundus Ef based on the light reception result of the return light of the illumination light acquired by the image sensor 60 by executing the central portion scan, and forms one or more peripherals. By executing the partial scan, a front image of one or more peripheral portions of the fundus Ef is formed based on the light receiving result of the return light of the illumination light acquired by the image sensor 60. The data processing unit 200 can acquire a composite image obtained by synthesizing the front image of the formed central portion and the front image of one or more peripheral portions.

For example, the data processing unit 200 determines the central portion and one or more peripheral portions based on the light receiving result of the return light of the illumination light acquired by the image sensor 60 by simultaneously executing the central portion scan and the peripheral portion scan. Form a frontal image of the fundus Ef including.

Further, the data processing unit 200 can perform various data processing (image processing) and analysis processing on the light receiving result obtained by using the optical system 10 under the control of the control unit 100. For example, the data processing unit 200 executes correction processing such as image brightness correction and dispersion correction. In some embodiments, the data processing unit 200 performs data processing such as image analysis, image evaluation, and diagnostic support.

The function of the data processing unit 200 is realized by a processor that operates according to a data processing program.

The moving mechanism 10D moves the optical system 10 three-dimensionally (in the X direction, the Y direction, and the Z direction). Thereby, the optical system 10 can be moved relative to the eye E to be inspected. For example, the moving mechanism 10D is provided with a holding member for holding the optical system 10, an actuator for generating a driving force for moving the holding member, and a transmission mechanism for transmitting the driving force. The actuator is composed of, for example, a pulse motor. The transmission mechanism is composed of, for example, a combination of gears or a rack and pinion. The control unit 100 can control the moving mechanism 10D to move the optical system 10 three-dimensionally. For example, this control is used in alignment and tracking. Alignment is alignment of the eye E to be inspected and the optical system 10 so that a desired portion of the fundus Ef is the center of imaging. When aligning, the optical system 10 is moved so that the positional relationship of the optical system 10 with respect to the eye to be inspected E has a predetermined relationship based on the image obtained by photographing the eye to be inspected E using the optical system for observing the anterior eye portion 20. It is something that makes you. The tracking is to move the optical system 10 according to the movement of the eye E to be inspected. When tracking is performed, alignment and focusing are performed in advance. Tracking is performed by aligning and focusing by moving the optical system 10 in real time according to the position and orientation of the eye to be inspected E based on an image obtained by taking a moving image of the eye to be inspected E using the optical system for observing the anterior eye portion 20. It is a function to maintain a suitable positional relationship.

In some embodiments, the optical system 10 is at least one of an alignment system for aligning the optical system 10 with respect to the eye E to be inspected and a focus system for focusing the optical system 10 with respect to the eye E to be inspected. Including one.

The moving mechanism 50D moves the rotary slit 50 in the direction of the photographing optical axis in the fundus Ef. As described above, the rotary slit 50 includes a central rotary slit for central scan and one or more peripheral rotary slits for peripheral scan. The moving mechanism 50D includes one or more moving mechanisms, and one or more moving mechanisms each of one or more rotating slits of the central rotating slit and one or more peripheral rotating slits excluding a predetermined rotating slit. Move in the direction of the shooting optical axis. In this case, the predetermined rotary slit is moved to a position optically coupled to the predetermined portion of the eye E to be inspected by the movement of the optical system 10 or the photographing optical system 70.

In some embodiments, the one or more moving mechanisms are one or more rotations of the central rotation slit and one or more peripheral rotation slits other than the predetermined rotation slit, based on the refractive index of the eye E to be inspected. Move each of the slits in the direction of the shooting optical axis. Since the shape (curvature) of the fundus Ef can be estimated based on the refractive index of the eye E to be inspected, illumination light is used for the slits formed in each rotating slit according to the estimated shape of the fundus Ef. It can be placed at a position that is optically coupled to the scan target site.

In some embodiments, one or more movement mechanisms are based on OCT data obtained by performing optical coherence tomography (OCT) on the fundus Ef of the eye E to be inspected. Each of the central rotation slit and one or more peripheral rotation slits other than the predetermined rotation slit is moved in the direction of the photographing optical axis. Since the shape of the fundus Ef can be specified with high accuracy based on the OCT data of the eye E to be inspected, illumination light is used for the slits formed in each rotating slit according to the specified shape of the fundus Ef. It is possible to place it at a position optically conjugate with the scan target site.

For example, each of the one or more moving mechanisms included in the moving mechanism 50D generates a holding member for holding the rotation slit to be moved and a driving force for moving the holding member, similarly to the moving mechanism 10D. An actuator and a transmission mechanism for transmitting this driving force are provided. The control unit 100 controls the movement mechanism 50D (each of one or more movement mechanisms) to control one or more rotation slits of the central rotation slit and one or more peripheral rotation slits other than the predetermined rotation slit. Each can be moved in the direction of the shooting optical axis.

The moving mechanism 70D moves the photographing optical system 70 in the direction of the photographing optical axis. Thereby, the photographing optical system 70 can be moved in the Z direction with respect to the eye E to be inspected. For example, the moving mechanism 70D includes a holding member that holds the photographing optical system 70, an actuator that generates a driving force for moving the holding member, and a transmission mechanism that transmits the driving force, as in the moving mechanism 10D. And are provided. The control unit 100 can control the moving mechanism 70D to move the photographing optical system 70 in the Z direction.

The rotation mechanism 40R rotates the pupil division rotation mirror 40 around a predetermined rotation axis (for example, a photographing optical axis). For example, the rotation mechanism 40R is provided with a holding member for holding the pupil split rotation mirror 40, an actuator for generating a driving force for rotating the holding member, and a transmission mechanism for transmitting the driving force. The control unit 100 can control the rotation mechanism 40R to rotate the pupil division rotation mirror 40. In some embodiments, the rotation mechanism 40R is provided with a rotary encoder, and the displacement amount of rotation of the pupil division rotation mirror 40 can be detected. The control unit 100 can control the rotation angle and rotation speed of the pupil division rotation mirror 40 based on the displacement amount detected by the rotary encoder.

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

(Operation unit 110)
The operation unit 110 is used for the user to input an instruction to the ophthalmic appliance 1. The operation unit 110 may include a known operation device used in a computer. For example, the operation unit 110 may include a pointing device such as a mouse, a touch pad, or a trackball. Further, the operation unit 110 may include a keyboard, a pen tablet, a dedicated operation panel, and the like.

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

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

[Optical system configuration]
Hereinafter, for convenience of explanation, a central scan for scanning the central portion of the fundus Ef including the imaging center with illumination light and a single peripheral portion outside the central portion of the fundus Ef being scanned with illumination light. A single peripheral scan and a case of performing a single peripheral scan will be described. However, the configuration according to the embodiment is not limited to the configuration described below. The configuration according to the embodiment is applicable to those that perform two or more peripheral scans.

2, FIG. 3, FIGS. 4A and 4B show configuration examples of the optical system 10 of FIG. FIG. 2 schematically shows a specific configuration example of the optical system 10 of FIG. FIG. 3 schematically shows a configuration example of the pupil division rotation mirror 40 of FIG. 2 as viewed from the direction of the photographing optical axis O. FIG. 4A schematically shows a configuration example of the central rotation slit 51 for scanning the central portion of FIG. 2 as viewed from the direction of the optical axis O. FIG. 4B schematically shows a configuration example of the peripheral rotation slit 52 for scanning the peripheral portion of FIG. 2 as viewed from the direction of the optical axis O. In FIGS. 2 to 4B, the same parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

In addition, in FIG. 2, the illustration of the anterior eye portion observation optical system 20 is omitted. For example, the optical element M1 that connects the optical path of the anterior segment observation optical system 20 and the optical path of the photographing optical system 70 is arranged between the lens (focusing lens) 12 and the pupil division rotating mirror 40.

The illumination optical system 30 includes a light source 30A and a condenser lens 30B. The illumination light output from the light source 30A passes through the condenser lens 30B and is reflected toward the eye E to be inspected by the pupil division rotation mirror 40.

As shown in FIG. 3, in the pupil division rotation mirror 40, a hole portion 40a is formed at a position eccentric from the photographing optical axis O, and the hole portion 40a is configured to be rotatable around the photographing optical axis O. The hole portion 40a is formed so that, for example, the shapes on the inner diameter side and the outer diameter side are part of an arc centered on the optical axis O. The illumination light that has passed through the condenser lens 30B is reflected toward the lens 12 by the mirror formed in the peripheral portion of the hole portion 40a in the pupil division rotating mirror 40.

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

In FIG. 2, the rotary slit 50 includes a central rotary slit 51 and a peripheral rotary slit 52. The central rotation slit 51 and the peripheral rotation slit 52 can be selectively arranged in the optical path between the pupil division rotation mirror 40 and the eye E to be inspected (the optical path coupled by the pupil division rotation mirror 40). That is, two or more rotary slits included in the rotary slit 50 are selectively arranged in the optical path. In this case, the moving mechanism 50D selectively arranges the central rotation slit 51 and the peripheral rotation slit 52 in the optical path between the pupil division rotation mirror 40 and the eye E to be inspected.

As shown in FIG. 4A, the central rotation slit 51 is formed with a slit 51a in the central region through which the photographing optical axis O passes. The central rotation slit 51 is rotated around the photographing optical axis O so that the slit 51a rotates about the photographing optical axis O. The photographing optical axis O is arranged so as to pass through the slit 51a. The slit 51a formed in the central rotation slit 51 is arranged at a position substantially conjugated with the central portion including the imaging center in the fundus Ef by moving the optical system 10 by the moving mechanism 10D.

As shown in FIG. 4B, the peripheral rotation slit 52 is formed with a slit 52a in the peripheral region outside the central region through which the photographing optical axis O passes. The peripheral rotation slit 52 is rotated so that the slit 52a rotates about the photographing optical axis O with the photographing optical axis O as the rotation axis. The slit 52a formed in the peripheral rotation slit 52 moves in the direction of the optical axis for imaging by the moving mechanism 50D, so that the slit 52a is optically coupled to the peripheral portion outside the central portion including the imaging center in the fundus Ef. Be placed.

When performing a peripheral scan for each of the two or more peripherals in the fundus Ef, the rotary slit 50 includes two or more peripheral rotary slits corresponding to the two or more peripherals. In each peripheral rotation slit, a slit is formed at a position corresponding to the target portion of the peripheral scan. Each moving mechanism including the moving mechanism 50D is arranged at a position optically conjugate with the target portion of the peripheral scan in the fundus Ef by moving the corresponding peripheral rotation slit in the direction of the optical axis for photographing.

As shown in FIGS. 4A and 4B, the slit formed in the rotary slit is formed so as to become wider as the distance from the photographing optical axis (rotation axis) increases (the length of the arc centered on the rotation axis passing through the slit). Is formed to be longer). In some embodiments, the slits are formed to have a substantially trapezoidal or triangular shape. Here, the substantially trapezoidal shape means not only a shape in which the upper and lower bases of the trapezoid are linear, but also a shape in which at least one of the upper base and the lower base of the trapezoid is arcuate. As a result, it is possible to reduce the difference between the amount of return light of the illumination light radiated to the central portion including the center of photography and the amount of return light of the illumination light radiated to the peripheral portion outside the central portion. In addition, it becomes possible to correct the amount of illumination light, and it becomes possible to correct the light distribution of the light source (the distribution of the amount of illumination light).

In some embodiments, the control unit 100 is of the irradiation system and the light receiving system so that the difference between the amount of return light obtained by the central scan and the amount of return light obtained by one or more peripheral scans is small. Control at least one. For example, the control unit 100 can reduce the difference in the amount of light by controlling the amount of illumination light. For example, the control unit 100 can reduce the difference in the amount of light by controlling the exposure time of the image sensor 60.

In some embodiments, the control unit 100 takes into account the balance between the amount of return light from the center obtained by the center scan and the amount of return light from the periphery obtained by the peripheral scan. The processing unit 200 is controlled to correct the brightness of the pixels in the center of the image obtained by scanning the center for each pixel. For example, the brightness of pixels in a region where a plurality of images are acquired by a central scan is averaged.

When the central portion scan is executed, the central portion rotating slit 51 is arranged on the photographing optical axis, and the peripheral portion rotating slit 52 is retracted from the photographing optical axis. The central rotation slit 51 rotates in synchronization with the rotation of the pupil division rotation mirror 40. In some embodiments, the rotation speed of the central rotation slit 51 is the same as the rotation speed of the pupil split rotation mirror 40. In some embodiments, the rotation speed of the central rotation slit 51 is an integral multiple of two or more of the rotation speed of the pupil split rotation mirror 40. In some embodiments, the rotation speed of the pupil split rotation mirror 40 is an integral multiple of two or more of the rotation speed of the central rotation slit 51.

The illumination light transmitted through the lens 12 as described above passes through the slit 51a formed in the central rotation slit 51, is refracted by the objective lens 11, and enters the eye through the pupil of the eye E to be inspected to enter the fundus Ef. Illuminates the central part including the shooting center in. The return light of the illumination light applied to the fundus Ef passes through the objective lens 11, the slit 51a formed in the central rotation slit 51, the lens 12, and is formed in the pupil division rotation mirror 40. It passes through the hole 40a and is imaged on the light receiving surface of the image sensor 60 by the imaging lens 13.

When the peripheral portion scan is executed, the peripheral portion rotating slit 52 is arranged on the photographing optical axis, and the central portion rotating slit 51 is retracted from the photographing optical axis. The peripheral rotation slit 52 rotates in synchronization with the rotation of the pupil division rotation mirror 40. In some embodiments, the rotation speed of the peripheral rotation slit 52 is the same as the rotation speed of the pupil split rotation mirror 40. In some embodiments, the rotation speed of the peripheral rotation slit 52 is an integral multiple of two or more of the rotation speed of the pupil split rotation mirror 40. In some embodiments, the rotation speed of the pupil split rotation mirror 40 is an integral multiple of two or more of the rotation speed of the peripheral rotation slit 52.

The illumination light transmitted through the lens 12 as described above passes through the slit 52a formed in the peripheral rotation slit 52, is refracted by the objective lens 11, and enters the eye through the pupil of the eye E to be inspected to enter the fundus Ef. Illuminates the outer peripheral part of the central part including the shooting center in. The return light of the illumination light applied to the fundus Ef passes through the objective lens 11, the slit 52a formed in the peripheral rotation slit 52, the lens 12, and is formed in the pupil division rotation mirror 40. It passes through the hole 40a and is imaged on the light receiving surface of the image sensor 60 by the imaging lens 13.

Here, the operation of the ophthalmic apparatus 1 according to the first embodiment will be described in comparison with the comparative example of the embodiment.

5 and 6 show an operation explanatory diagram of the ophthalmic apparatus according to the comparative example of the embodiment. FIG. 5 schematically shows a general scan for the fundus Ef. FIG. 6 schematically shows the relationship between the illumination light incident on the eyeball and the scan region in the fundus Ef.

In the comparative example of the embodiment, the illumination light is irradiated to the illumination region IR0 that moves in the predetermined scan direction DR with respect to the predetermined scan region including the imaging center Pc in the fundus Ef. In FIG. 5, the linear illumination region IR0 is moved in the scanning direction DR. The return light of the illumination light applied to each illumination area is received by the image sensor. As a result, the entire scan area including the imaging center Pc in the fundus Ef is scanned by the illumination light.

Therefore, when the focus adjustment of the illumination light is performed on the photographing center Pc set at the attention portion in the fundus Ef, the focus position of the illumination light shifts in the peripheral portion of the fundus away from the photographing center Pc. As a result, an image in which blurring occurs in a peripheral portion away from the shooting center Pc can be obtained. This is true not only when the eye E to be inspected has a substantially normal axial length, but also when the axial length of the eye to be inspected E is long.

7 and 8 show an operation explanatory diagram of the ophthalmic apparatus 1 according to the first embodiment. FIG. 7 schematically shows a central scan and a peripheral scan for the fundus Ef. FIG. 8 schematically shows the relationship between the illumination light incident on the eyeball and the scan region in the fundus Ef.

In the central scan CS, the illumination light is irradiated to the illumination region IR1 rotating around the imaging center Pc in the fundus Ef. For example, the illumination region IR1 includes a shooting center Pc. In FIG. 7, the slit-shaped illumination region IR1 is rotated around the photographing center Pc. The return light of the illumination light applied to each illumination area is received by the image sensor 60 as described above. As a result, the central portion of the fundus Ef including the imaging center Pc is scanned by the illumination light.

In the peripheral scan PS, the illumination light is applied to the illumination region IR2 rotating around the imaging center Pc in the fundus Ef. The illumination region IR2 does not include the photographing center Pc (and the center portion). In FIG. 7, the slit-shaped illumination region IR2 is rotated around the photographing center Pc. The return light of the illumination light applied to each illumination area is received by the image sensor 60 as described above. As a result, the peripheral portion outside the central portion including the imaging center Pc in the fundus Ef is scanned by the illumination light.

In some embodiments, the central scan CS and the peripheral scan PS are performed simultaneously. In some embodiments, the central scan CS and the peripheral scan PS are time-division-independent.

Therefore, when the axial length of the eye to be inspected E is substantially normal and the fundus has a substantially normal shape (left side of FIG. 8), the central portion including the imaging center Pc is the pupil PL of the eye to be inspected E by the central scan CS. It is scanned in a state of being in focus by the illumination light incident on the eye through. Further, the peripheral portion outside the central portion is also scanned by the peripheral portion scan PS in a state of being in focus by the illumination light incident on the inside of the eye through the pupil PL of the eye E to be inspected.

On the other hand, even when the axial length of the eye to be inspected E is long (the figure on the right side of FIG. 8), the central portion including the imaging center Pc is the illumination light incident on the eye through the pupil PL of the eye to be inspected E by the central scan CS. Is scanned in focus. Further, the peripheral portion outside the central portion is also scanned by the peripheral portion scan PS in a state of being in focus by the illumination light incident on the inside of the eye through the pupil PL of the eye E to be inspected.

Therefore, according to the embodiment, it is possible to acquire an image in which not only the central portion of the fundus Ef but also the peripheral portion is in focus regardless of the shape of the fundus of the eye E to be inspected.

The fundus Ef is an example of the "predetermined part of the eye to be inspected" according to the embodiment. The illumination optical system 30 is an example of the “irradiation system” according to the embodiment. The image sensor 60 is an example of the "light receiving system" according to the embodiment. The control unit 100 or the control unit 101 is an example of the “control unit” according to the embodiment. The data processing unit 200 is an example of the "image forming unit" according to the embodiment. The rotary slit 50 (central rotary slit 51, 1 or more peripheral rotary slits 52) is an example of "two or more slits" according to the embodiment. The central rotation slit 51 is an example of the "first slit" according to the embodiment. The peripheral rotation slit 52 is an example of the "second slit" according to the embodiment. The moving mechanism 50D is an example of "one or more moving mechanisms" according to the embodiment.

[Operation example]
An example of the operation of the ophthalmic apparatus 1 according to the first embodiment will be described.

9A and 9B show an outline of an operation example of the ophthalmic apparatus 1 according to the first embodiment. 9A and 9B show a flow chart of an operation example of the ophthalmic appliance 1 according to the first embodiment. The storage unit 102 of the control unit 100 stores a computer program for realizing the processes shown in FIGS. 9A and 9B. The control unit 101 of the control unit 100 executes the processes shown in FIGS. 9A and 9B by operating according to this computer program.

(S1: Accepts refraction)
First, the control unit 101 receives the refractive index of the eye E to be inspected.

In some embodiments, the control unit 101 controls the display unit 120 to cause the display unit to display information prompting the user to input the refractive index of the eye E to be inspected. The user inputs the refraction degree of the eye E to be inspected by performing an operation on the operation unit 110. The control unit 101 receives the refraction degree of the eye E to be inspected based on the operation content for the operation unit 110.

In some embodiments, the control unit 101 requests the external refraction force measuring device to transmit the refraction of the eye E to be inspected, and the refraction of the eye E to be inspected stored in the refraction force measuring device in advance. By receiving the degree, the refraction degree of the eye E to be inspected is received.

(S2: Determine the difference in focus position between the central part and the peripheral part)
Subsequently, the control unit 101 determines the focus position of the illumination light for the central portion including the imaging center in the fundus Ef and the illumination light for the outer peripheral portion of the central portion based on the refractive index of the eye E to be inspected received in step S1. Identify the difference from the focus position of.

It is known that the refractive index of the eye to be inspected correlates with the shape of the fundus of the eye to be inspected. For example, in the case of myopia, the axial length of the eye to be examined becomes long, and as myopia progresses, the curvature of the fundus, which represents the shape of the fundus, increases. Therefore, it is possible to specify the difference between the position in the optical axis direction of the imaging center on the fundus and the position in the optical axis direction of the peripheral portion on the fundus according to the refractive index of the eye to be inspected. That is, the position on the optical axis of the central portion rotating slit 51 that should be arranged at a position substantially conjugate with the central portion, and the peripheral portion rotating slit 52 that should be arranged at a position substantially conjugate with the peripheral portion. The position on the optical axis of is identifiable.

For example, the storage unit 102 stores in advance table information in which the difference in position on the optical axis of the peripheral rotation slit 52 with respect to the position on the optical axis of the central rotation slit 51 and a plurality of refractive degrees are associated with each other. Has been done. The control unit 101 can refer to the table information stored in the storage unit 102 to specify the difference in the position on the optical axis associated with the refraction of the eye E to be inspected received in step S1. be.

In some embodiments, the contrast of the fundus image obtained iteratively is analyzed to determine the position on the optical axis of the central rotation slit 51 that should be located at a position optically coupled to the central portion. , The position on the optical axis of the peripheral rotation slit 52 to be arranged at a position optically conjugate with the peripheral portion is specified. For example, the difference between the focus position of the illumination light with respect to the central portion and the focus position of the illumination light with respect to the peripheral portion is specified so that the difference in contrast between the central portion and the peripheral portion is minimized.

(S3: Move the peripheral rotation slit)
Next, the control unit 101 moves the peripheral rotation slit 52 in the direction of the photographing optical axis by controlling the movement mechanism 50D based on the difference in the focus position specified in step S2. That is, the position of the peripheral rotation slit 52 with respect to the central rotation slit 51 in the direction of the photographing optical axis is shifted.

In some embodiments, the control unit 101 controls the movement mechanism 50D to move the central rotation slit 51 to a predetermined reference position on the photographing optical axis and to move the peripheral rotation slit 52. The peripheral rotation slit 52 is moved so as to shift in the shooting optical axis direction by a distance d (see FIG. 2) corresponding to the difference in the focus position from the reference position.

(S4: Alignment)
Subsequently, the control unit 101 controls the moving mechanism 10D and the like to move the optical system 10 to the initial position. After that, the control unit 101 controls the execution of alignment for aligning the optical system 10 with respect to the eye E to be inspected. For example, in step S4, the light receiving surface of the image sensor 60 is arranged at a position optically conjugate with the fundus Ef, and the hole portion 40a formed in the pupil split rotation mirror 40 is optically substantially substantially the pupil of the eye E to be inspected. It is placed in a conjugate position.

For example, the control unit 101 causes the display unit 120 to display the image of the anterior eye portion of the eye to be inspected E acquired by using the anterior eye portion observation optical system 20. The control unit 101 can control the movement mechanism 10D so as to move the optical system 10 in the direction specified by the user by using the operation unit 110.

In some embodiments, the control unit 101 projects light from an alignment light source included in an alignment system (not shown) onto the eye E to be inspected, and controls the movement mechanism 10D based on an image corresponding to the return light. , Aligning the optical system 10 with respect to the eye E to be inspected.

In some embodiments, the control unit 101 uses two or more cameras (not shown) to photograph the anterior eye portion of the eye E to be inspected from different directions, and the two or more images provided with parallax are taken from the two or more images of the eye E to be inspected. Have the position specified. The control unit 101 controls the movement mechanism 10D based on the position of the specified eye E to be inspected, thereby executing the alignment of the optical system 10 with respect to the eye E to be inspected.

(S5: Central rotation slit is placed in the optical path)
Subsequently, the control unit 101 controls the moving mechanism 50D to arrange the central rotation slit 51 in the photographing optical path (shooting optical axis). The peripheral rotation slit 52 is retracted from the photographing optical path.

(S6: Adjust the slit position)
Next, the control unit 101 controls the rotation mechanisms 40R and 50R to rotate the pupil division rotation mirror 40 and the central rotation slit 51 to a predetermined rotation start position.

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

For example, the control unit 101 identifies the in-focus state (blurring state) of the fundus image obtained by the photographing optical system 70, and moves the moving mechanism 70D or the lens so that the specified in-focus state becomes a desired in-focus state. The focus position of the illumination light is adjusted by controlling the moving mechanism that moves the twelve.

As a result, the slit 51a formed in the central rotation slit 51 is arranged at a position optically conjugate with the central portion including the imaging center in the fundus Ef. When the peripheral rotation slit 52 is arranged at the shift position corresponding to the difference in the focus position based on this position, the slit 52a formed in the peripheral rotation slit 52 is the central portion including the imaging center in the fundus Ef. It is placed at a position that is optically conjugate with the outer peripheral part of the.

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

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

(S10: Rotate the pupil split rotation mirror and the central rotation slit)
Subsequently, the control unit 101 controls the rotation mechanisms 40R and 50R to start the rotation of the pupil division rotation mirror 40 and the central rotation slit 51. The control unit 101 controls the rotation mechanisms 40R and 50R so that the pupil division rotation mirror 40 and the central rotation slit 51 start rotating at the same time and rotate at the same rotation speed.

This will perform a central scan. In the central scan, the return light of the illumination light applied to each illumination range is received by the image sensor 60.

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

When it is determined to execute the peripheral scan following the central scan (S11: Y), the operation of the ophthalmic appliance 1 shifts to step S12. When it is determined not to execute the peripheral scan following the central scan (S11: N), the operation of the ophthalmic appliance 1 shifts to step S15.

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

(S13: Adjust the slit position)
Next, the control unit 101 controls the rotation mechanisms 40R and 50R to rotate the pupil division rotation mirror 40 and the central rotation slit 51 to a predetermined rotation start position.

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

As a result, a peripheral scan is executed. Even in the peripheral scan, the return light of the illumination light applied to each illumination range is received by the image sensor 60.

(S15: end of exposure)
When it is determined not to execute the peripheral scan following the central scan in step S14 or in step S11 (S11: N), the control unit 101 controls the image sensor 60 to control the image sensor 60 from the fundus Ef. The exposure of the return light of the illumination light is finished.

(S16: Display)
The control unit 101 displays an image of the fundus Ef based on the light receiving result obtained by the image sensor 60 by the central scan in step S10 and the light receiving result obtained by the image sensor 60 by the peripheral scan in step S14. It is displayed on the display unit included in 120.

In some embodiments, the control unit 101 controls the data processing unit 200 to acquire an image of the central part of the fundus Ef based on the light receiving result obtained by the image sensor 60 by the central part scan in step S10. .. Further, the control unit 101 controls the data processing unit 200 to acquire an image of the peripheral portion of the fundus Ef based on the light receiving result obtained by the image sensor 60 by the peripheral portion scan in step S14. The control unit 101 controls the data processing unit 200 to form a composite image in which the acquired image of the central portion and the image of the peripheral portion are combined.

This completes the operation of the ophthalmic appliance 1 (end).

FIG. 10 shows an operation explanatory diagram of the ophthalmic apparatus 1 according to the first embodiment. FIG. 10 schematically shows an image IMG0 of the fundus Ef acquired by the ophthalmologic apparatus according to the comparative example of the first embodiment and an image IMG1 of the fundus Ef acquired by the ophthalmologic apparatus 1 according to the first embodiment. ..

In the ophthalmic apparatus according to the comparative example of the first embodiment, since the focus position of the illumination light cannot be set between the central portion and the peripheral portion of the fundus Ef, the central portion becomes clear and the peripheral portion is blurred. The image IMG0 of the fundus Ef is acquired.

On the other hand, according to the ophthalmologic apparatus 1 according to the first embodiment, since the focus position of the illumination light can be set in each of the central portion and the peripheral portion of the fundus Ef, the central portion and the peripheral portion are clear. An image IMG1 of a high-quality fundus Ef is acquired.

As described above, according to the first embodiment, the central scan for irradiating the illumination region rotating around the imaging center in the central portion including the imaging center with the illumination light, and the imaging center in the peripheral portion outside the central portion. An image of the fundus Ef is acquired by peripheral scanning that irradiates the illumination area rotating around the center with illumination light. Thereby, the image of the fundus Ef can be acquired with the illumination light whose focus position can be set for each of the central portion and the peripheral portion. As a result, it is possible to easily acquire a high-quality image of the eye to be inspected even when the angle of view is large.

Further, since the fundus Ef is scanned with the illumination light (center scan, peripheral scan) so that the illumination range rotates around the center of the image in the fundus Ef of the eye to be inspected E, the fundus Ef is scanned from the center of the objective lens 11. It is possible to weaken the intensity of the reflective component and remove the artifacts caused by the reflective component. Therefore, even when the angle of view is large, it is possible to easily acquire a high-quality image of the eye E to be inspected.

<Second Embodiment>
In the first embodiment, a case where the central rotation slit 51 and the peripheral rotation slit 52 are selectively arranged in the optical path and the central scan and the peripheral scan are executed in a time-division manner has been described. The configuration according to the above is not limited to this.

For example, the optical path (photographing optical path) coupled by the pupil division rotation mirror 40 is divided into two or more optical paths, and a central rotation slit and one or more peripheral rotation slits are arranged in each of the two or more divided optical paths. This makes it possible to simultaneously execute the central scan and one or more peripheral scans.

Hereinafter, the ophthalmic apparatus according to the second embodiment will be described focusing on the differences from the first embodiment.

FIG. 11 shows a configuration example of the optical system of the ophthalmic apparatus according to the second embodiment. In FIG. 11, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

The difference between the configuration of the optical system of the ophthalmologic apparatus according to the second embodiment and the configuration of the optical system 10 of the ophthalmologic apparatus 1 according to the first embodiment is that the optical system arranged between the photographing optical system 70 and the objective lens 11 It is the composition of the system.

Specifically, a beam splitter 71, 74, a reflection mirror 72, 76, a lens 73, 75, a central rotation slit 51, and a peripheral rotation slit 52 are provided between the photographing optical system 70 and the objective lens 11. It has been. At least one of the beam splitters 71 and 74 may be a half mirror.

A beam splitter 71 is arranged in a shooting optical path (illumination light path, return light path) coupled by the pupil split rotation mirror 40. The beam splitter 71 divides the optical path for imaging into a first optical path for scanning the central portion and a second optical path for scanning the peripheral portion. A central rotation slit 51, a reflection mirror 72, and a lens 73 are arranged in the first photographing optical path. A peripheral rotation slit 52, a reflection mirror 76, and a lens 75 are arranged in the second photographing optical path. The first optical path and the second optical path are coupled by a beam splitter 74 and guided to the objective lens 11.

The control of the ophthalmic apparatus according to the second embodiment is the same as that of the first embodiment. However, according to the second embodiment, the scan for the fundus Ef can be performed while the central rotation slit 51 and the peripheral rotation slit 52 are arranged on the optical path. Therefore, in steps S10 and S14 of FIG. 9B, Can be executed at the same time.

The beam splitter 71 is an example of the "optical path dividing member" according to the embodiment. The rotary slit 50 is an example of "two or more slits" according to the embodiment. The beam splitter 74 is an example of the "optical path coupling member" according to the embodiment. The central rotation slit 51 is an example of the "first slit" according to the embodiment. The peripheral rotation slit 52 is an example of the "second slit" according to the embodiment.

As described above, according to the second embodiment, the image of the fundus Ef can be acquired by the illumination light in which the focus position can be set for each of the central portion and the peripheral portion, as in the first embodiment. As a result, it is possible to easily acquire a high-quality image of the eye to be inspected even when the angle of view is large. Further, since the central scan and the peripheral scan can be executed at the same time, it is possible to more easily acquire a high-quality image of the eye to be inspected.

Further, since the fundus Ef is scanned with the illumination light (center scan, peripheral scan) so that the illumination range rotates around the center of imaging in the fundus Ef of the eye to be inspected E, the fundus Ef is scanned from the center of the objective lens 11. It is possible to weaken the intensity of the reflective component and remove the artifacts caused by the reflective component. Therefore, even when the angle of view is large, it is possible to easily acquire a high-quality image of the eye E to be inspected.

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

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

Hereinafter, the ophthalmic apparatus according to the third embodiment will be described focusing on the differences from the first embodiment.

FIG. 12 shows a block diagram of a configuration example of the ophthalmic apparatus according to the third embodiment. In FIG. 12, the same parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

The main points that the configuration of the ophthalmic apparatus 1a according to the third embodiment is different from the configuration of the ophthalmic apparatus 1 according to the first embodiment are that the optical system 10a is provided instead of the optical system 10 and that the rotation mechanism 50R is provided. The omitted points and the points where the control unit 100a is provided in place of the control unit 100.

The main difference between the configuration of the optical system 10a and the configuration of the optical system 10 is that the slit 50a and the optical scanner 80 are provided between the illumination optical system 30 and the pupil division rotating mirror 40 instead of the rotating slit 50. It is a point.

The main difference between the control unit 100a and the control unit 100 is that the optical scanner 80 is subjected to deflection control instead of the rotation control for the rotation mechanism 50R.

Similar to the rotary slit 50, the slit 50a includes a central slit for scanning the central portion and one or more peripheral slits for scanning one or more peripheral portions. Similar to the first embodiment, the central slit for central scanning and one or more peripheral slits for one or more peripheral scanning are selectively arranged in the photographing optical path.

The optical scanner 80 deflects the light that has passed through the slit formed in the slit 50a (either the central slit or one or more peripheral slits), and guides the deflected light to the pupil division rotation mirror 40. The optical scanner 80 is arranged at a position optically conjugate with a predetermined portion of the eye E to be inspected. Predetermined sites include the position of the center of the pupil and the position of the center of gravity of the pupil. As a result, the illumination light that has passed through the slit formed in the slit 50a is deflected with a predetermined portion in the eye E to be inspected as the scan center position.

In some embodiments, the optical scanner 80 includes a uniaxial deflecting member or a biaxial deflecting member orthogonal to each other. Examples of deflection members include galvano mirrors, polygon mirrors, rotating mirrors, dowel prisms, double dowel prisms, rotation prisms, and MEMS mirror scanners. When a biaxial deflection member is used, a deflection member for high-speed scanning (for example, a polygon mirror) and a deflection member for low-speed scanning (for example, a galvano mirror) can be combined. The optical scanner 80 may further include an optical element for projecting the deflected light onto the eye E to be inspected.

The optical scanner 80 is controlled by the control unit 100a and can deflect the illumination light that has passed through the slit formed in the slit 50a. As a result, the irradiation position of the illumination light in the fundus Ef is changed to at least one direction of the X direction and the Y direction.

For example, the illumination light deflected by the optical scanner 80 passes through the hole formed in the pupil division rotating mirror 40, is reflected by the optical element M1, passes through the objective lens 11, and is guided to the eye E to be inspected. The return light from the eye E to be inspected passes through the objective lens 11, is reflected by the optical element M1, is reflected by the mirror formed in the peripheral portion of the hole portion of the pupil division rotating mirror 40, and is guided to the image sensor 60.

The control unit 100a includes a control unit 101a and a storage unit 102a. The control unit 101a can perform the same control as the control unit 101 and control the optical scanner 80. The storage unit 102a stores the same contents as the storage unit 102, and also stores the computer program executed by the control unit 101a.

FIG. 13 shows a configuration example of the optical system 10a of the ophthalmic apparatus 1a according to the third embodiment. In FIG. 13, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted as appropriate. Similar to FIG. 2, in FIG. 13, the illustration of the anterior ocular segment observation optical system 20 is omitted.

In FIG. 13, the light receiving system (image sensor 60, imaging lens 13) is arranged in the reflection direction of the pupil division rotation mirror 40, and the irradiation system (light source 30A, condenser lens 30B) is arranged in the transmission direction of the pupil division rotation mirror 40. Has been done.

A lens 82, an optical scanner 80, a lens 81, and a slit 50a are arranged between the pupil split rotating mirror 40 and the condenser lens 30B.

The slit 50a includes a central slit 53 for central scanning and one or more peripheral slits for one or more peripheral scanning. In FIG. 13, the slit 50a includes a single peripheral slit 54. The central slit 53 and one or more peripheral slits are selectively arranged in the optical path. In this case, the moving mechanism 50D selectively arranges the central slit 53 and one or more peripheral slits in the optical path.

For example, in the central portion slit 53, the slit 51a is formed in the central region through which the photographing optical axis O passes, similarly to the central portion rotating slit 51. The illumination light that has passed through the slit 51a is applied to the central portion of the fundus Ef so that the illumination region rotates about the photographing optical axis O by the deflection operation by the optical scanner 80. By moving the optical system 10a in the direction of the illumination optical axis (shooting optical axis) by the moving mechanism 10D, the slit 51a formed in the central slit 53 is optically substantially coupled to the central portion including the photographing center in the fundus Ef. Can be placed in any position.

For example, in the peripheral slit 54, a slit 52a is formed in the peripheral region outside the central region through which the photographing optical axis O passes, similarly to the peripheral rotating slit 52. The illumination light that has passed through the slit 52a is irradiated to the peripheral portion of the fundus Ef so that the illumination region rotates about the photographing optical axis O by the deflection operation by the optical scanner 80. The slit 52a formed in the peripheral slit 54 by moving the peripheral slit 54 in the illumination optical axis (shooting optical axis) direction by the moving mechanism 50D is the outer peripheral portion of the central portion including the photographing center in the fundus Ef. It can be placed at a position that is optically coupled to the optical axis.

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

14A and 14B show an outline of an operation example of the ophthalmic apparatus 1a according to the third embodiment. 14A and 14B show a flow chart of an operation example of the ophthalmic apparatus 1a according to the third embodiment. The storage unit 102a of the control unit 100a stores a computer program for realizing the processes shown in FIGS. 14A and 14B. The control unit 101a of the control unit 100a executes the processes shown in FIGS. 14A and 14B by operating according to this computer program.

(S21: Accepts refraction)
First, the control unit 101a receives the refractive index of the eye E to be inspected, as in step S1.

(S22: Determine the difference in focus position between the central part and the peripheral part)
Subsequently, similarly to step S2, the control unit 101a determines the focus position of the illumination light with respect to the central portion including the imaging center in the fundus Ef and the outside of the central portion based on the refractive index of the eye E to be inspected received in step S21. Identify the difference from the focus position of the illumination light with respect to the peripheral part of.

(S23: Move the peripheral slit)
Next, similarly to step S3, the control unit 101a controls the movement mechanism 50D based on the difference in the focus position specified in step S22, thereby illuminating the peripheral slit 54 with the illumination optical axis (in a broad sense, photographing). Move in the direction of the optical axis).

(S24: Alignment)
Subsequently, the control unit 101a controls the moving mechanism 10D to move the optical system 10a to the initial position in the same manner as in step S4. After that, the control unit 101a controls the execution of alignment for aligning the optical system 10a with respect to the eye E to be inspected.

(S25: Central rotation slit is placed in the optical path)
Subsequently, the control unit 101a controls the moving mechanism 50D in the same manner as in step S5 to arrange the central slit 53 in the illumination optical path (shooting optical path, photographing optical axis). The peripheral slit 54 is retracted from the illumination optical path.

(S26: Adjust the slit position)
Next, the control unit 101a controls the rotation mechanism 40R in the same manner as in step S6 to rotate the pupil division rotation mirror 40 to a predetermined rotation start position.

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

(S28: Turn on the light source for fundus lighting)
Subsequently, the control unit 101a controls the light source 30A of the illumination optical system 30 to turn on the light source for fundus scanning, as in step S8.

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

(S30: Rotation control of pupil division rotation mirror, deflection control of optical scanner)
Subsequently, the control unit 101a controls the rotation mechanism 40R to start the rotation of the pupil division rotation mirror 40, and controls the optical scanner 80 to start the deflection control of the illumination light. The control unit 101a synchronizes the rotation control of the pupil division rotation mirror 40 and the deflection control of the optical scanner 80 so that the illumination light passing through the pupil division rotation mirror 40 is irradiated to the illumination region rotating at the center of imaging in the fundus Ef. Let me.

This will perform a central scan. In the central scan, the return light of the illumination light applied to each illumination range is received by the image sensor 60.

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

When it is determined to execute the peripheral scan following the central scan (S31: Y), the operation of the ophthalmic apparatus 1a shifts to step S32. When it is determined not to execute the peripheral scan following the central scan (S31: N), the operation of the ophthalmic apparatus 1a shifts to step S35.

(S32: Peripheral slits are placed in the optical path)
When it is determined in step S31 that the peripheral scan is to be executed following the central scan (S31: Y), the control unit 101a controls the moving mechanism 50D in the same manner as in step S12 to control the illumination optical path (shooting light). A peripheral slit 54 is arranged on the shaft). The central slit 53 is retracted from the illumination optical path.

(S33: Adjust the slit position)
Next, the control unit 101a controls the rotation mechanism 40R in the same manner as in step S13 to rotate the pupil division rotation mirror 40 to a predetermined rotation start position.

(S34: Rotation control of pupil division rotation mirror, deflection control of optical scanner)
Subsequently, the control unit 101a controls the rotation mechanism 40R to start the rotation of the pupil division rotation mirror 40, and controls the optical scanner 80 to start the deflection control of the illumination light. The control unit 101a synchronizes the rotation control of the pupil division rotation mirror 40 and the deflection control of the optical scanner 80 so that the illumination light passing through the pupil division rotation mirror 40 is irradiated to the illumination region rotating at the center of imaging in the fundus Ef. Let me.

As a result, a peripheral scan is executed. Even in the peripheral scan, the return light of the illumination light applied to each illumination range is received by the image sensor 60.

(S35: end of exposure)
When it is determined not to execute the peripheral scan following the central scan in step S34 or in step S31 (S31: N), the control unit 101a controls the image sensor 60 in the same manner as in step S15. Then, the exposure of the return light of the illumination light from the fundus Ef is completed.

(S36: Display)
Similar to step S16, the control unit 101a is based on the light receiving result obtained by the image sensor 60 by the central scan in step S30 and the light receiving result obtained by the image sensor 60 by the peripheral scan in step S34. The image of Ef is displayed on the display unit included in the display unit 120.

This completes the operation of the ophthalmic apparatus 1a (end).

<Action>
The ophthalmic apparatus, the control method of the ophthalmic apparatus, and the program according to the embodiment will be described.

The ophthalmic apparatus (1, 1a) according to some embodiments includes an irradiation system (illumination optical system 30), a light receiving system (image sensor 60), a control unit (control unit 100, control unit 101), and image formation. A unit (data processing unit 200) and the like. The irradiation system irradiates the illumination range rotating around the imaging center at a predetermined portion (fundus Ef) of the eye to be inspected (E) with illumination light. The light receiving system includes an image sensor (60) in which the light receiving surface can be arranged at a position optically conjugate to a predetermined portion, and receives the return light of the illumination light applied to the illumination range. The control unit performs a central scan that scans the central portion including the shooting center with illumination light and one or more peripheral scans that scan each of one or more peripheral portions outside the central portion with illumination light. The irradiation system and the light receiving system are controlled. The image forming unit forms an image of the eye to be inspected based on the light reception result of the return light obtained by the central scan and the light reception result of the return light obtained by one or more peripheral scans.

According to such an aspect, it becomes possible to scan the central portion of a predetermined portion of the eye to be inspected and one or more peripheral portions with illumination light whose focus positions are adjusted independently of each other. Furthermore, since the predetermined area of the eye to be inspected is scanned with the illumination light so that the illumination range rotates around the center of imaging in the predetermined area, the intensity of the reflection component from the optical system such as the objective lens is weakened, and the reflection component is reflected. The artifacts caused by can be removed. Therefore, even when the angle of view is large, it is possible to easily obtain a high-quality image of the eye to be in focus, which is in focus over the entire predetermined portion.

In some embodiments, the control unit at least the irradiation system and the light receiving system so that the difference between the amount of return light obtained by the central scan and the amount of return light obtained by one or more peripheral scans is small. Control one.

According to such an aspect, the brightness of the image obtained by the central scan and the brightness of the image obtained by the peripheral scan can be made uniform, so that the image quality of the image to be inspected can be improved. ..

In some embodiments, the irradiation system and the light receiving system are movable in the direction of the photographing optical axis.

According to such an aspect, it becomes possible to easily acquire an image in which a predetermined portion of the eye to be inspected is in focus.

Some embodiments include a lens (12) that is located in the optical path of the irradiation system and the optical path of the light receiving system and is movable along the optical path.

According to such an aspect, it becomes possible to easily acquire an image in which a predetermined portion of the eye to be inspected is in focus.

Some embodiments include a pupil split rotating mirror (40) in which a hole (40a) is formed at a position eccentric from the optical axis of photography and connects the optical path of the irradiation system and the optical path of the light receiving system. It can be arranged at a position optically conjugate with the pupil of the eye to be inspected, and the pupil division rotation mirror can rotate the hole portion around the optical axis of photography in synchronization with the movement of the illumination range.

According to such an embodiment, the illumination light and the return light can be separated by pupil division, and a higher image quality image of the eye to be inspected, which is in focus over the entire predetermined portion, can be easily obtained.

In some embodiments, two or more slits (center rotation slit 51, peripheral portion) in which a slit rotatable about the optical axis of photography is formed and can be selectively arranged in the optical path connected by the pupil division rotation mirror. The two or more slits including the rotary slit 52) include the first slit (central rotary slit 51) in which the slit (51a) is formed in the central region through which the optical axis of photography passes, and the outside of the central region through which the optical axis of photography passes. 1 or more second slits (peripheral rotation slits 52) in which slits (52a) are formed in each of one or more peripheral regions of the above, and the slits formed in the first slits are optically formed with the central portion. The slits formed in one or more second slits can be arranged at positions substantially conjugate with one or more peripheral portions in a predetermined portion.

According to such an aspect, while removing artifacts caused by reflection components from an optical system such as an objective lens, a high-quality image of the eye to be inspected that is in focus over the entire predetermined portion even when the angle of view is large can be obtained. It can be easily obtained.

Some embodiments are arranged in each of an optical path dividing member (beam splitter 71) that divides an optical path coupled by a pupil division rotating mirror into two or more optical paths, and two or more optical paths divided by the optical path dividing member. Two or more slits (central rotation slit 51, peripheral rotation slit 52) having a rotatable slit about the shooting optical axis and two or more optical paths divided by the optical path dividing member are connected and connected. The first slit (central portion) in which a slit (51a) is formed in the central region through which the photographing optical axis passes, includes an optical path coupling member (beam splitter 74) that guides the light of the optical path to the eye to be inspected. Includes a rotary slit 51) and one or more second slits (peripheral rotary slits 52) in which slits (52a) are formed in each of one or more peripheral regions outside the central region through which the photographing optical axis passes. The slit formed in the first slit can be arranged at a position optically conjugate with the central portion, and the slits formed in one or more second slits are optically with one or more peripheral portions in a predetermined portion. It can be placed at a position that is substantially conjugate to the optical path.

According to such an aspect, while removing artifacts caused by reflection components from an optical system such as an objective lens, a high-quality image of the eye to be inspected that is in focus over the entire predetermined portion even when the angle of view is large can be obtained. It can be easily obtained. Further, since the central scan and one or more peripheral scans can be performed at the same time, it is possible to more easily acquire a high-quality image of the eye to be inspected.

In some embodiments, two or more slits (central slit 53, peripheral slit 54) in which slits are formed and selectively arranged in an optical path coupled by a pupil split rotation mirror, and a pupil split rotation mirror Includes an optical scanner (80) that is placed between two or more slits and deflects light that has passed through a slit formed in any of the two or more slits so as to rotate about the center of imaging at a predetermined portion. The two or more slits are a first slit (central slit 53) in which a slit is formed in the central region through which the optical axis of photography passes, and one or more peripheral regions outside the central region through which the optical axis of photography passes. 1 or more second slits (peripheral slit 54) in which the The slit formed in the second slit can be arranged at a position optically coupled to one or more peripheral portions in a predetermined portion.

According to such an aspect, while removing artifacts caused by reflection components from an optical system such as an objective lens, a high-quality image of the eye to be inspected that is in focus over the entire predetermined portion even when the angle of view is large can be obtained. It can be easily obtained. In addition, since the illumination area is rotated around the center of photography by using an optical scanner, it is possible to remove artifacts caused by reflection components from an optical system such as an objective lens with a simple configuration.

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

According to such an embodiment, any one of the two or more slits is arranged at a position optically conjugate with any of the central portion including the imaging center and the one or more peripheral portions, and the other slits are also predetermined portions. It becomes possible to place it at a position optically conjugate with the desired site in the above. As a result, it becomes possible to acquire a high-quality image of the eye to be in focus in focus over the entire predetermined portion while simplifying the configuration.

In some embodiments, one or more moving mechanisms (moving mechanism 50D) that move each of the one or more second slits in the direction of the photographing optical axis based on the refractive power of the eye to be inspected are included.

According to such an embodiment, it becomes possible to easily arrange each of the one or more second slits at a position optically conjugate with the one or more peripheral portions in the predetermined portion of the eye to be inspected, and the predetermined portion. It is possible to acquire a high-quality image of the eye to be inspected that is in focus over the entire area.

In some embodiments, it comprises one or more moving mechanisms (moving mechanism 50D) that move each of the one or more second slits in the direction of the imaging optical axis based on the OCT data of the eye to be inspected.

According to such an embodiment, it is possible to easily and highly accurately arrange each of the one or more second slits at a position optically conjugate with one or more peripheral portions in a predetermined portion of the eye to be inspected. It will be possible. As a result, it becomes possible to acquire a high-quality image of the eye to be inspected, which is in focus over the entire predetermined portion.

In some embodiments, the slits formed in each of the two or more slits are formed so as to become wider as the distance from the optical axis of photography increases.

According to such an aspect, it is possible to easily reduce the difference between the amount of illumination light emitted to the central portion including the center of photography and the amount of illumination light emitted to one or more peripheral portions. As a result, it becomes possible to acquire a high-quality image of the eye to be inspected, in which the entire predetermined portion is in focus and the luminance unevenness is reduced.

In some embodiments, the slits formed in each of the two or more slits have a substantially trapezoidal or triangular shape.

According to such an aspect, it is possible to acquire a high-quality image of the eye to be inspected with a simple configuration, in which the entire predetermined portion is in focus and the luminance unevenness is reduced.

In some embodiments, the irradiation step of irradiating the illumination range rotating around the imaging center in the predetermined portion (fundament Ef) of the eye to be inspected (E) with the illumination light, and the light receiving surface optically coupled to the predetermined portion. A light receiving step that receives the return light of the illumination light radiated to the illumination range using an image sensor (60) that can be arranged at various positions, and a central scan that scans the central portion including the shooting center with the illumination light. A control step that performs one or more peripheral scans that scan each of one or more peripherals outside the central area with illumination light, a return light reception result obtained by the central scan, and one or more peripherals. It is a control method of an ophthalmologic apparatus (1, 1a) including an image formation step of forming an image of an eye to be inspected based on a light receiving result of a return light obtained by a partial scan.

According to such an aspect, it becomes possible to scan the central portion of a predetermined portion of the eye to be inspected and one or more peripheral portions with illumination light whose focus positions are adjusted independently of each other. Furthermore, since the predetermined area of the eye to be inspected is scanned with the illumination light so that the illumination range rotates around the center of imaging in the predetermined area, the intensity of the reflection component from the optical system such as the objective lens is weakened, and the reflection component is reflected. The artifacts caused by can be removed. Therefore, even when the angle of view is large, it is possible to easily obtain a high-quality image of the eye to be in focus, which is in focus over the entire predetermined portion.

In some embodiments, the control step is an irradiation system that illuminates the illumination light so that the difference between the amount of return light obtained by the central scan and the amount of return light obtained by one or more peripheral scans is small. And at least one of the light receiving systems that receive the return light is controlled.

According to such an aspect, the brightness of the image obtained by the central scan and the brightness of the image obtained by the peripheral scan can be made uniform, so that the image quality of the image to be inspected can be improved. ..

In some embodiments, the ophthalmologic apparatus has a hole (40a) formed at a position eccentric from the imaging optical axis to combine the optical path of the irradiation system that irradiates the illumination light with the optical path of the light receiving system that receives the return light. The hole can be placed at a position optically conjugate with the pupil of the eye to be inspected, and the control step is centered on the shooting optical axis in synchronization with the movement of the illumination range. The pupil division rotation mirror is controlled so as to rotate the hole.

According to such an embodiment, the illumination light and the return light can be separated by pupil division, and a higher image quality image of the eye to be inspected, which is in focus over the entire predetermined portion, can be easily obtained.

In some embodiments, the ophthalmologic apparatus has two or more slits (center rotation slits) in which a rotatable slit is formed about the imaging optical axis and can be selectively placed in an optical path coupled by a pupil split rotating mirror. 51, including the peripheral rotation slit 52), the two or more slits are the first slit (central rotation slit 51) in which the slit (51a) is formed in the central region through which the optical axis of photography passes, and the optical axis of photography passes through. The slit formed in the first slit includes one or more second slits (peripheral rotation slit 52) in which slits (52a) are formed in each of one or more peripheral regions outside the central region. It can be arranged at a position optically conjugate with the portion, and the slits formed in one or more second slits can be arranged at a position optically conjugate with one or more peripheral portions at a predetermined portion.

According to such an embodiment, while removing artifacts caused by reflection components from an optical system such as an objective lens, a high-quality image of the eye to be inspected that is in focus over the entire predetermined portion even when the angle of view is large can be obtained. It can be easily obtained.

In some embodiments, the ophthalmic apparatus consists of an optical path dividing member (beam splitter 71) that divides an optical path coupled by a pupil dividing rotating mirror into two or more optical paths, and two or more optical paths divided by the optical path dividing member. Two or more slits (central rotation slit 51, peripheral rotation slit 52) arranged in each and formed with a slit rotatable about the shooting optical axis are combined with two or more optical paths divided by an optical path dividing member. The first, which includes an optical path coupling member (beam splitter 74) that guides the light of the coupled optical path to the eye to be inspected, and two or more slits have a slit (51a) formed in the central region through which the photographing optical axis passes. A slit (central rotation slit 51) and one or more second slits (peripheral rotation slit 52) in which slits (52a) are formed in each of one or more peripheral regions outside the central region through which the shooting optical axis passes. , And the slit formed in the first slit can be arranged at a position optically conjugate with the central portion, and one or more slits formed in the second slit are one or more peripherals in a predetermined portion. It can be arranged at a position optically conjugate with the part.

According to such an aspect, while removing artifacts caused by reflection components from an optical system such as an objective lens, a high-quality image of the eye to be inspected that is in focus over the entire predetermined portion even when the angle of view is large can be obtained. It can be easily obtained. Further, since the central scan and one or more peripheral scans can be performed at the same time, it is possible to more easily acquire a high-quality image of the eye to be inspected.

In some embodiments, the ophthalmologic apparatus has two or more slits (central slit 53, peripheral slit 54) that are slit-formed and can be selectively placed in an optical path coupled by a pupil split rotating mirror and a pupil. An optical scanner that is placed between the split rotation mirror and two or more slits and deflects light that has passed through a slit formed in one of the two or more slits so as to rotate about the center of imaging at a predetermined portion. The two or more slits include the first slit (central slit 53) in which a slit is formed in the central region through which the optical axis of photography passes, and one or more peripheral regions outside the central region through which the optical axis of photography passes. 1 or more second slits (peripheral slits 54) having slits formed therein, and the slits formed in the first slits can be arranged at positions optically coupled to the central portion. The slits formed in the above second slits can be arranged at positions optically coupled to one or more peripheral portions in a predetermined portion.

According to such an embodiment, while removing artifacts caused by reflection components from an optical system such as an objective lens, a high-quality image of the eye to be inspected that is in focus over the entire predetermined portion even when the angle of view is large can be obtained. It can be easily obtained. In addition, since the illumination area is rotated around the center of photography by using an optical scanner, it is possible to remove artifacts caused by reflection components from an optical system such as an objective lens with a simple configuration.

In some embodiments, the slits formed in each of the two or more slits are formed so as to become wider as the distance from the optical axis of photography increases.

According to such an aspect, it is possible to easily reduce the difference between the amount of illumination light emitted to the central portion including the center of photography and the amount of illumination light emitted to one or more peripheral portions. As a result, it becomes possible to acquire a high-quality image of the eye to be inspected, in which the entire predetermined portion is in focus and the luminance unevenness is reduced.

In some embodiments, the slits formed in each of the two or more slits have a substantially trapezoidal or triangular shape.

According to such an aspect, it is possible to acquire a high-quality image of the eye to be inspected with a simple configuration, in which the entire predetermined portion is in focus and the luminance unevenness is reduced.

Some embodiments are programs that cause a computer to perform each step of the method of controlling an ophthalmic appliance according to any of the above.

According to such an aspect, it becomes possible to scan the central portion of a predetermined portion of the eye to be inspected and one or more peripheral portions with illumination light whose focus positions are adjusted independently of each other. Furthermore, since the predetermined area of the eye to be inspected is scanned with the illumination light so that the illumination range rotates around the center of imaging in the predetermined area, the intensity of the reflection component from the optical system such as the objective lens is weakened, and the reflection component is reflected. The artifacts caused by can be removed. Therefore, even when the angle of view is large, it is possible to easily obtain a high-quality image of the eye to be in focus, which is in focus over the entire predetermined portion.

The embodiments shown above are merely examples for carrying out the present invention. A person who intends to carry out the present invention can make arbitrary modifications, omissions, additions, etc. within the scope of the gist of the present invention.

1, 1a Ophthalmology device 10, 10a Optical system 10D, 50D, 70D Moving mechanism 11 Objective lens 12, 73, 75, 81, 82 Lens 13 Imaging lens 20 Front eye observation optical system 30 Illumination optical system 30A Light source 30B Condenser lens 40 pupil split rotation mirror 40a Hole 40R, 50R Rotation mechanism 50 Rotation slit 50a Slit 51 Central rotation slit 51a, 52a Slit 52 Peripheral rotation slit 53 Central slit 54 Peripheral slit 60 Image sensor 70 Imaging optical system 71, 74 Beam splitter 72, 76 Reflection mirror 80 Optical scanner 100, 100a Control unit 101, 101a Control unit 102, 102a Storage unit 110 Operation unit 120 Display unit 200 Data processing unit E Eye under test Ef Optical element

Claims (22)

An irradiation system that irradiates the illumination range that rotates around the center of imaging at a predetermined part of the eye to be inspected, and an irradiation system.
A light receiving system that includes an image sensor that can be arranged at a position where the light receiving surface is optically conjugate to the predetermined portion and receives the return light of the illumination light radiated to the illumination range.
A central scan that scans the central portion including the imaging center with the illumination light and one or more peripheral scans that scan each of the one or more peripheral portions outside the central portion with the illumination light are performed. A control unit that controls the irradiation system and the light receiving system,
An image forming unit that forms an image of the eye to be inspected based on the light reception result of the return light obtained by the central scan and the light reception result of the return light obtained by one or more peripheral scans.
Including ophthalmic equipment. The control unit has at least the irradiation system and the light receiving system so that the difference between the light amount of the return light obtained by the central scan and the light amount of the return light obtained by one or more peripheral scans is small. The ophthalmic apparatus according to claim 1, wherein one of them is controlled. The ophthalmic apparatus according to claim 1 or 2, wherein the irradiation system and the light receiving system are movable in the direction of the photographing optical axis. The ophthalmologic apparatus according to any one of claims 1 to 3, further comprising a lens arranged in the optical path of the irradiation system and the optical path of the light receiving system and movable along the optical path. A hole is formed at a position eccentric from the optical axis of photography, and includes a pupil split rotating mirror that connects the optical path of the irradiation system and the optical path of the light receiving system.
The hole can be arranged at a position optically conjugate with the pupil of the eye to be inspected.
The aspect according to any one of claims 1 to 4, wherein the pupil split rotation mirror can rotate the hole portion about the photographing optical axis in synchronization with the movement of the illumination range. Ophthalmology equipment. A rotatable slit is formed around the shooting optical axis, and includes two or more slits that can be selectively arranged in the optical path connected by the pupil split rotating mirror.
The two or more slits
A first slit in which a slit is formed in the central region through which the optical axis of photography passes, and
One or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the optical axis of photography passes, and
Including
The slit formed in the first slit can be arranged at a position optically conjugate with the central portion.
The ophthalmic apparatus according to claim 5, wherein the slits formed in the one or more second slits can be arranged at positions optically conjugate with the one or more peripheral portions in the predetermined portion. .. An optical path dividing member that divides an optical path coupled by the pupil division rotating mirror into two or more optical paths, and an optical path dividing member.
Two or more slits arranged in each of the two or more optical paths divided by the optical path dividing member and having a rotatable slit about the shooting optical axis, and two or more slits.
An optical path coupling member that combines the two or more optical paths divided by the optical path dividing member and guides the light of the combined optical path to the eye to be inspected.
Including
The two or more slits
A first slit in which a slit is formed in the central region through which the optical axis of photography passes, and
One or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the optical axis of photography passes, and
Including
The slit formed in the first slit can be arranged at a position optically conjugate with the central portion.
The ophthalmic apparatus according to claim 5, wherein the slits formed in the one or more second slits can be arranged at positions optically conjugate with the one or more peripheral portions in the predetermined portion. .. Two or more slits in which slits are formed and can be selectively arranged in the optical path coupled by the pupil split rotation mirror,
Light that has passed through a slit arranged between the pupil split rotation mirror and the two or more slits and formed in any of the two or more slits so as to rotate about the imaging center at the predetermined portion. An optical scanner that deflects,
Including
The two or more slits
The first slit, in which a slit is formed in the central region through which the shooting optical axis passes,
One or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the optical axis of photography passes, and
Including
The slit formed in the first slit can be arranged at a position optically conjugate with the central portion.
The ophthalmic apparatus according to claim 5, wherein the slits formed in the one or more second slits can be arranged at positions optically conjugate with the one or more peripheral portions in the predetermined portion. .. The invention according to any one of claims 6 to 8, wherein the two or more slits are movable in the direction of the photographing optical axis except for one of the two or more slits. Ophthalmology equipment. 6. The ophthalmic apparatus according to the first paragraph. 6. The ophthalmic apparatus according to the first paragraph. The ophthalmology according to any one of claims 6 to 11, wherein the slits formed in each of the two or more slits are formed so as to become wider as the distance from the photographing optical axis increases. Device. The ophthalmic apparatus according to claim 12, wherein the slits formed in each of the two or more slits have a substantially trapezoidal shape or a triangular shape. An irradiation step of irradiating an illumination range that rotates around the center of imaging at a predetermined part of the eye to be inspected, and an irradiation step.
A light receiving step of receiving the return light of the illumination light applied to the illumination range by using an image sensor in which the light receiving surface can be arranged at a position optically conjugate to the predetermined portion.
Control to execute a central scan that scans the central portion including the shooting center with the illumination light, and one or more peripheral scans that scan each of the one or more peripheral portions outside the central portion with the illumination light. Steps and
An image forming step of forming an image of the eye to be inspected based on the light reception result of the return light obtained by the central scan and the light reception result of the return light obtained by one or more peripheral scans.
Methods of controlling ophthalmic appliances, including. The control step includes an irradiation system that irradiates the illumination light so that the difference between the light amount of the return light obtained by the central scan and the light amount of the return light obtained by one or more peripheral scans is small. The control method for an ophthalmic apparatus according to claim 14, wherein at least one of the light receiving systems that receive the return light is controlled. The ophthalmic apparatus includes a pupil split rotating mirror in which a hole is formed at a position eccentric from the optical axis of photography and connects an optical path of an irradiation system that irradiates the illumination light and an optical path of a light receiving system that receives the return light. ,
The hole can be arranged at a position optically conjugate with the pupil of the eye to be inspected.
14. The control step according to claim 14 or 15, wherein the pupil division rotation mirror is controlled so as to rotate the hole portion about the photographing optical axis in synchronization with the movement of the illumination range. The method of controlling an ophthalmic apparatus according to the description. The ophthalmologic apparatus comprises two or more slits in which a rotatable slit is formed about the imaging optical axis and which can be selectively arranged in an optical path coupled by the pupil split rotating mirror.
The two or more slits
A first slit in which a slit is formed in the central region through which the optical axis of photography passes, and
One or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the optical axis of photography passes, and
Including
The slit formed in the first slit can be arranged at a position optically conjugate with the central portion.
The ophthalmic apparatus according to claim 16, wherein the slits formed in the one or more second slits can be arranged at positions optically conjugate with the one or more peripheral portions in the predetermined portion. Control method. The ophthalmic appliance
An optical path dividing member that divides an optical path coupled by the pupil division rotating mirror into two or more optical paths, and an optical path dividing member.
Two or more slits arranged in each of the two or more optical paths divided by the optical path dividing member and having a rotatable slit about the shooting optical axis, and two or more slits.
An optical path coupling member that combines the two or more optical paths divided by the optical path dividing member and guides the light of the combined optical path to the eye to be inspected.
Including
The two or more slits
A first slit in which a slit is formed in the central region through which the optical axis of photography passes, and
One or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the optical axis of photography passes, and
Including
The slit formed in the first slit can be arranged at a position optically conjugate with the central portion.
The ophthalmic apparatus according to claim 16, wherein the slits formed in the one or more second slits can be arranged at positions optically conjugate with the one or more peripheral portions in the predetermined portion. Control method. The ophthalmic appliance
Two or more slits in which slits are formed and can be selectively arranged in the optical path coupled by the pupil split rotation mirror,
Light that has passed through a slit arranged between the pupil split rotation mirror and the two or more slits and formed in any of the two or more slits so as to rotate about the imaging center at the predetermined portion. An optical scanner that deflects,
Including
The two or more slits
The first slit, in which a slit is formed in the central region through which the shooting optical axis passes,
One or more second slits in which slits are formed in each of one or more peripheral regions outside the central region through which the optical axis of photography passes, and
Including
The slit formed in the first slit can be arranged at a position optically conjugate with the central portion.
The ophthalmic apparatus according to claim 16, wherein the slits formed in the one or more second slits can be arranged at positions optically conjugate with the one or more peripheral portions in the predetermined portion. Control method. The ophthalmology according to any one of claims 17 to 19, wherein the slits formed in each of the two or more slits are formed so as to become wider as the distance from the photographing optical axis increases. How to control the device. The control method for an ophthalmic apparatus according to claim 20, wherein the slits formed in each of the two or more slits have a substantially trapezoidal shape or a triangular shape. A program comprising causing a computer to execute each step of the method for controlling an ophthalmic apparatus according to any one of claims 14 to 21.

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