JP7009776B2 - Ophthalmic appliances and optical elements used for them - Google Patents

Description

The present disclosure relates to an ophthalmic apparatus that captures an angle image of an eye to be inspected, and an optical element used therein.

In diagnosing glaucoma, it is useful to observe the angle of the eye to be inspected. Conventionally, an examiner visually observes an angle through an angle mirror, but in recent years, various devices for photographing the angle have been proposed.

For example, Patent Document 1 discloses a device that irradiates an angle of an eye to be inspected with illumination light and obtains a reflected image of the angle based on the reflected light from the angle.

International Publication 2015/180923

By the way, in the conventional apparatus, since a gel is interposed between the eye to be inspected and the objective optical element for measurement, it is necessary to replace the objective optical element every time a picture is taken. At this time, if the objective optical element is attached in the wrong direction, there is a possibility that the angle image cannot be taken well.

In view of the conventional problems, it is a technical subject of the present disclosure to provide an ophthalmic apparatus capable of correctly mounting an optical element and an optical element used thereof.

In order to solve the above problems, the present disclosure is characterized by having the following configurations.

(1) An ophthalmologic device that photographs the corners of the eye to be inspected, the projection optical system that projects illumination light to the corners of the eye to be inspected, and the objective optics that are inserted on the optical axis of the projection optical system. It is provided with a tubular mounting portion on which an optical element, which is an element, can be mounted, and the mounting portion sets a rotation angle around the optical axis of the optical element to an angle at which a corner angle can be photographed at a predetermined imaging position. The restricting means is provided on the peripheral edge of the cylinder, and the regulating means is provided with a fitting portion that regulates the rotation angle of the optical element by fitting with the grip portion of the holder that holds the optical element. It is a feature.
(2) In the ophthalmic apparatus of (1), an optical element which is an objective optical element mounted on the mounting portion and is held by the holder, and the grip portion of the holder is the fitting portion of the regulating means. It is characterized in that the rotation angle is regulated by fitting with.

It is a figure which showed the angle image taken by the ophthalmic apparatus of an Example. It is a schematic diagram which showed the schematic structure of the ophthalmic apparatus of an Example. It is a schematic diagram which showed an example of a photographing optical system. It is a schematic diagram which shows the objective reflection part. It is a figure which shows a part of a floodlight optical system. It is a figure which shows an example of the light-shielding part of an objective reflection part. It is a figure which shows an example of the mounting part. It is a perspective view of a mounting part. It is a block diagram which showed an example of a control system. It is a figure which showed the angle image taken by the ophthalmic apparatus of an Example.

{Embodiment}
<First Embodiment>
Hereinafter, the first embodiment of the present disclosure will be described. The first embodiment is an ophthalmic apparatus (for example, an ophthalmic apparatus 1) for photographing an angle of an eye to be inspected. The ophthalmic apparatus of the first embodiment includes, for example, a floodlight optical system (for example, a floodlight optical system 30) and a light receiving optical system (light receiving optical system 60). The projection optical system projects illumination light to the corner of the eye to be inspected. The light receiving optical system has a light receiving element that receives the reflected light from the angle. The floodlight optical system of the first embodiment includes a light-shielding unit (for example, a light-shielding unit 50a). The light-shielding portion is provided, for example, in at least a part of the optical elements of the floodlight optical system. The light-shielding portion shields stray light generated by reflection or diffusion of illumination light for illuminating the eye to be inspected inside the projection optical system. Further, the light-shielding portion suppresses the generation of stray light generated by the diffusion or reflection of the illumination light inside the optical system. As a result, the ophthalmic appliance can suppress the stray light from being incident on the fundus of the eye to be inspected, and can reduce the burden on the subject.

The light-shielding portion is provided in the central region (for example, central regions A1 and A2) located inside the peripheral regions (for example, peripheral regions B1 and B2) through which the illumination light passes in the optical element. Since the illumination light for illuminating the corner of the eye to be inspected passes through the peripheral region, a light-shielding portion is provided in the central region through which the illumination light does not pass. This makes it possible to block unnecessary stray light without blocking the illumination light for illuminating the eye to be inspected.

The light-shielding portion may be an annular shape having an opening (opening 50b) in the center. In this case, for example, the fixation light flux from the fixation optical system may be incident on the eye to be inspected through the opening.

The floodlight optical system includes a first optical element (for example, an objective reflection unit 50) and a second optical element (for example, a lens 49) that are adjacent to each other in the optical axis direction, and the light-shielding unit includes a first optical element and a second optical element. It may be provided on the opposite side of the element. By providing a light-shielding portion on a plurality of optical elements, stray light can be shielded more reliably.

The light-shielding portion may be formed by printing in black or by printing in another color. Of course, the light-shielding portion may be formed by painting or coating. For example, the light-shielding portion may be coated with black chromium (chromium oxide).

The optical element may have a reflecting surface on the front side and a translucent surface on the rear side with respect to the eye to be inspected. For example, the optical element may be a mirror prism.

<Second Embodiment>
Hereinafter, the second embodiment will be described. The second embodiment is also an ophthalmic apparatus for photographing the angle of the eye to be inspected, as in the first embodiment. The ophthalmic appliance of the second embodiment includes a mounting portion (for example, a mounting portion 90). An optical element (for example, an objective reflection unit 50) to be inserted onto the optics of the projection optical system can be mounted on the mounting portion. Further, the mounting portion includes a regulating portion that regulates the posture of the optical element. As described above, the ophthalmic appliance of the second embodiment can prevent the optical element from being mounted in a posture different from the normal one by restricting the posture of the optical element mounted on the mounting portion.

The optical element may be an objective optical element. The objective optical element is, for example, the optical element closest to the eye to be inspected.

For example, the regulating unit may regulate the rotation angle of the optical element around the optical axis. For example, when the optical element includes a plurality of reflecting surfaces arranged in the circumferential direction, the regulating unit regulates the rotation angle of the optical element so that the reflecting surfaces face a predetermined direction.

The regulating portion may include a fitting portion (for example, a fitting portion 95). The fitting portion regulates the posture of the optical element by, for example, fitting with a part of a holder (for example, the holder 51) that holds the optical element. For example, the fitting portion may regulate the posture of the optical element by fitting with the convex portion provided on the holder.

The mounting portion may be cylindrical. In this case, the fitting portion may be a notch provided in the cylindrical mounting portion. For example, a part of the holder may be fitted in the notch to regulate the posture of the holder. Of course, the fitting portion is not limited to the notch and may be a concave portion.

The mounting portion may include two or more fitting portions. Further, by making the shapes of the two or more fitting portions different from each other, it may be possible to prevent the holder from being mounted on the mounting portion upside down.

Further, for example, when three or more fitting portions have the same shape, the fitting portion may be arranged at a position where the shape of the mounting portion is asymmetric with respect to any meridian. This makes it possible to prevent the holder from being mounted on the mounting portion in the opposite state. The meridian is, for example, based on the center of the optical axis of the optical element held in the holder.

The holder may include a grip portion. The grip portion is, for example, a handle when the examiner holds the holder. In this case, the fitting portion may be fitted with the grip portion provided on the holder.

The regulating portion may include a fitting portion that fits the entire holder. For example, the fitting portion and the holder have a polygonal shape (for example, a hexagon), and by fitting the fitting portion and the entire holder, rotation of the optical element is prevented and the posture of the optical element is restricted. good.

The mounting portion may be provided with a magnetic material (for example, a magnet) for holding the holder. This makes it possible to prevent the holder from being unintentionally detached from the mounting portion.

{Example}
Hereinafter, examples of the ophthalmic apparatus according to the present disclosure will be shown with reference to the drawings. The ophthalmic apparatus 1 according to the embodiment is an angle photographing apparatus. The ophthalmic appliance 1 captures a reflected image (see FIG. 1) of the corner of the eye to be inspected.

<Device configuration>
A schematic device configuration of the ophthalmic device 1 will be described with reference to FIG. In the following description, the X direction shown in FIG. 2 will be referred to as a left-right direction, the Y direction will be referred to as a vertical direction, and the Z direction will be referred to as a front-back direction.

The ophthalmic appliance 1 irradiates the visual axis of the eye E to be inspected with illumination light in an oblique direction. Then, the ophthalmologist 1 receives the reflected light from the angle region along the photographing optical axis, thereby capturing an image in the angle region of the eye to be inspected.

As shown in FIG. 1, the ophthalmic apparatus 1 includes a base 3, an alignment mechanism 4, 5a, 5b, a face support unit 6, a joystick 7, a monitor 8, an optical unit 10, and the like.

The optical unit 10 has a main optical system used for capturing an angle image. Details of the optical system will be described later with reference to FIG. In the embodiment, the optical unit 10 is housed in the cover 10a. However, the tip portion 11 is exposed to the outside of the cover 10a.

The base 3 supports the alignment mechanisms 4, 5a and 5b, and the face support unit 6. The alignment mechanisms 4, 5a and 5b in this embodiment are roughly classified into a moving table 4 and XYZ drive units 5a and 5b. Of these, the moving table 4 is operated by a mechanical mechanism, and the XYZ drive units 5a and 5b are operated by an electric actuator.

The moving table 4 is arranged on the base 3 and has a mechanical moving mechanism between the moving table 4 and the base 3. This moving mechanism moves the moving table 4 in the XZ direction, and as a result, adjusts the positional relationship between the eye E to be inspected and the optical unit 10 in the XZ direction. The examiner moves the moving table 4 with respect to the base 3 by operating the joystick 7.

The XYZ drive units 5a and 5b in this embodiment are further loaded on the moving table 4. The XYZ drive units 5a and 5b move the optical unit 10 in each direction of the XYZ based on the control signal from the control unit 80 (see FIG. 4) of the ophthalmologic device 1. As a result, the positional relationship between the eye E to be inspected and the optical unit 10 is adjusted in each direction of XYZ.

The monitor 8 is arranged on the side surface of the housing on the examiner side. The monitor 8 displays, for example, an angle image taken through the optical unit 10.

<Optical system>
Next, the optical system provided in the optical unit 10 will be described with reference to FIG. The optical unit 10 has at least a photographing optical system 30. Further, in this embodiment, the optometry optical system 70 is further provided.

For convenience, first, the optometry optical system 70 will be described. The optometry optical system 70 has at least a optometry light source (optometry marker) 71. Further, in FIG. 3, the optometry optical system 70 further includes an aperture 72, a lens 73, and a mirror 74. The light emitted from the light source 71 passes through the lens 73 via the aperture 72 and is collimated with a predetermined luminous flux diameter. The collimated light is bent by the mirror 74 and projected onto the eye E to be inspected. In FIG. 3, the optical axis of the fixation optical system 70 (more specifically, the range from the mirror 74 to the eye E to be inspected in the optical axis of the fixation optical system 70) is represented by the reference numeral L1. Further, L1 is referred to as an optical axis for fixation. Each member of the photographing optical system 30 shown in FIG. 3 is arranged with reference to the fixed optical axis.

The photographing optical system 30 includes a floodlight optical system 40 and a light receiving optical system 60. Further, the photographing optical system 30 has a photographing optical axis L2. The photographing optical axis L2 is inclined with respect to the fixation optical axis L1 and faces the angle of the eye E to be inspected.

The floodlight optical system 40 has, for example, at least an objective reflection unit 50. Further, in the embodiment, the projection optical system 40 includes a light source 41, a lens 42, an aperture 43, a lens 44, a mirror 45, a ring aperture 46, a perforated mirror 47, an optical eccentric portion 48, a lens 49, and the like. ..

The light source 41 is a light source of illumination light applied to a corner. In this embodiment, the light source 41 emits visible light. In the following description, in order to obtain a corner image as a color image, it is assumed that at least light of a plurality of colors having different wavelength ranges (for example, white light) can be emitted.

The light (illumination light) from the light source 41 is incident on the optical eccentric portion 48 via the lens 42, the aperture 43, the lens 44, the mirror 45, the ring aperture 46, and the perforated mirror 47.

Here, the ring aperture 46 is provided to suppress the stray light M due to reflection inside the photographing optical system 30. For example, reflection by the surface of the lens 48c, the lens 49, etc. on the light source 41 side is suppressed by the ring aperture 46.

Further, the perforated mirror 47 is an example of an optical path branching portion for branching an optical path between the light projecting optical system 40 and the light receiving optical system 60. Instead of the perforated mirror 47, another beam splitter such as a half mirror may be applied. In this embodiment, the light from the light source 41 is reflected by the mirror surface of the perforated mirror 47 toward the light eccentric portion 48.

In this embodiment, the optical path center of the illumination light reflected by the perforated mirror 47 is coaxial with the fixed-view optical axis L1.

The optical eccentric portion 48 eccentricizes the optical path of the illumination light with respect to the fixed-view optical axis L1. For example, the center of the optical path of the illumination light is shifted by a predetermined interval with respect to the fixed-view optical axis L1 by using two mirrors 48a and 48b arranged in parallel. The shifted illumination light passes through the lens 48c, is irradiated to the outside from the light eccentric portion 48, and is incident on the objective reflection portion 50 via the lens 49. In this embodiment, the optical axes of the lens 49 and the objective reflection unit 50 are arranged coaxially with the fixed optical axis L1. Therefore, the shifted illumination light passes through a region (peripheral region As) separated from the optical axis of the lens 49 and the objective reflection unit 50 by a predetermined interval.

The lens 49 is a lens having a negative power, and the illumination light emitted from the optical eccentric portion 48 substantially parallel to the fixed optical axis L1 is bent in a direction away from the fixed optical axis L1 to be bent away from the fixed optical axis L1. To be incident on.

The objective reflecting unit 50 has a reflecting surface that bends the illumination light toward the fixed optical axis L1 side. The optical axis of the illumination light reflected by the reflecting surface is bent so as to be greatly inclined with respect to the fixed-view optical axis L1 and guided to the outside of the apparatus. At this time, the optical axis guided to the outside of the apparatus is used as the photographing optical axis L2 in this embodiment. The illumination light from the device is applied to the angle region of the eye E to be inspected along the photographing optical axis L2.

In this embodiment, a plurality of reflecting surfaces are arranged side by side around the optical axis in the objective reflecting unit 50. As a specific example of the objective reflection unit 50, in this embodiment, for example, a frustum-shaped prism having a regular polygon on the bottom surface is used. More specifically, the bottom surface is a regular hexadecagon, and a prism having 16 side surfaces is utilized. In the present embodiment, when viewed from the eye E to be inspected, the fixation optical axis L1 is in each direction of 0 °, 22.5 °, 45 °, 67.5 °, 90 ° ... (Omitted) ... 337.5 °. A reflective surface facing the surface is arranged. It should be noted that each angle is an angle with respect to the fixed optical axis L1. Further, for convenience of explanation, 0 ° is on a horizontal plane.

However, the reflective surface does not necessarily have to be divided into a plurality of sheets, and may be formed by a series of curved surfaces. Further, the objective reflecting unit 50 does not necessarily have to be a prism, and may be, for example, a reflecting mirror. In the case of a reflecting mirror, it may be a tubular multi-sided mirror or a curved mirror having a reflecting surface on the optical axis side.

Here, the ophthalmic appliance 1 of the present embodiment has a driving unit 48d (see FIG. 4) that rotates the optical eccentric portion 48 around the fixation optical axis L1. In response to the rotation of the optical eccentric portion 48, the incident position of the illumination light with respect to the lens 49 and the objective reflecting portion 50 is rotated around the fixed optical axis L1. As a result, the photographing optical axis L2 is rotated around the fixation optical axis L1, and as a result, the irradiation position of the illumination light around the entire circumference of the angle is displaced.

In this embodiment, the gel G is interposed between the objective reflection unit 50 (prism) and the cornea. The gel G is applied to the cornea in order to suppress the corneal reflex of the illumination light. The gel G may be in contact with both the cornea and the tip of the objective reflection unit 50 in a state of being filled in a holding container (not shown) (for details, see Japanese Patent Application Laid-Open No. 2002-17680 by the present applicant. "Etc.).

The illumination light emitted by the projection optical system 40 is reflected in the corner region and is guided to the light receiving optical system 60 inside the apparatus by following the photographing optical axis L2.

In this embodiment, the light receiving optical system 60 has at least an image pickup element (an example of a light receiving element) 62. Further, the light receiving optical system 60 shares at least the objective reflection unit 50 and the perforated mirror (beam splitter) 47 with the light projecting optical system 40. Further, the optical eccentric portion 48, the lens 49, etc. may be shared with the light projecting optical system 40. Further, the light receiving optical system 60 has a focus lens 61. The focus lens 61 is a part of the focus changing portion in the photographing optical system 30 of this embodiment. The ophthalmic appliance 1 is provided with a drive unit 61a for moving the focus lens 61 along the optical axis. The drive unit 61a may include, for example, a linear actuator.

The reflected light from the angle region is applied to the perforated mirror 47 via the objective reflecting portion 50, the lens 49, and the light eccentric portion 48. After that, the reflected light passes through the aperture of the perforated mirror 47 and the focus lens 61, respectively, and is imaged in the image pickup device 62. As a result, an angle image is obtained based on the light receiving signal from the image pickup element 62, in which the portion irradiated with the illumination light is the imaging position on the entire circumference of the angle.

Further, by rotating the optical eccentric portion 48 and rotating the photographing optical axis L2 around the fixation optical axis L1, the imaging position on the entire circumference of the angle can be switched. As described above, in the present embodiment, since the objective reflection unit 50 has 16 reflection surfaces, the entire circumference of the angle can be divided into 16 and each of them can be selectively imaged.

<Shading part>
The objective reflection unit 50 and the lens 49 of this embodiment are provided with a light-shielding unit. The light-shielding portion suppresses the generation of stray light M (see FIG. 3) caused by the diffusion or reflection of the illumination light in the objective reflection unit 50 or the lens 49, and prevents the stray light M from being incident on the fundus of the eye to be inspected. ..

FIG. 4A shows a state when the objective reflection unit 50 is viewed from the subject side, and FIG. 4B shows a state when the objective reflection unit 50 is viewed from the lens 49 side. As shown in FIG. 4B, the light-shielding portion 50a is provided not in the peripheral region B1 through which the illumination light passes, but in the central region A1 through which the illumination light does not pass. Further, the light-shielding portion 50a of this embodiment is annular, and an opening 50b is provided in the center. The opening 50b is provided to allow light from the fixation light source 71 to pass through. That is, the light-shielding portion 50a is provided in the annular region between the optical axis L1 and the optical axis L2.

FIG. 5 shows a state when the lens 49 is viewed from the subject side. Like the light-shielding portion 50a, the light-shielding portion 49a of the lens 49 is provided not in the peripheral region B2 through which the illumination light passes, but in the central region A2 through which the illumination light does not pass. An opening 49b is also provided in the center of the light-shielding portion 49a in order to allow light from the fixation light source 71 to pass therethrough.

In this embodiment, the light-shielding portion 49a and the light-shielding portion 50a are printed in black. By printing in black, the illumination light (stray light M) reflected or diffused in an unexpected direction inside the photographing optical system 30 is shielded, and the stray light M incident on the fundus of the eye to be inspected is reduced. This can prevent the subject from feeling glare.

Of course, the light-shielding portion 49a or the light-shielding portion 50a may be configured to be capable of light-shielding, and is not limited to black printing. For example, it may be printed in another color, or it may be painted or coated instead of printed. For example, the light-shielding portions 49a and 50a may be formed by coating with black chromium (chromium oxide). Further, the light-shielding portions 49a and 50a may be formed by a film or a seal.

The light-shielding portions 49a and 50a may be circular or polygonal as shown in FIG. The light-shielding portions 49a and 50a may have a shape that does not block the illumination light flux and the fixation light beam.

It should be noted that the light-shielding portion does not have to be provided on both the objective reflection portion 50 and the lens 49, and only one of them may be provided.

<Mounting of objective reflector>
Since the objective reflection unit 50 is brought close to the eye to be inspected E with the gel G interposed therebetween, the objective reflection unit 50 can be removed from the tip portion 11 so as to be easily replaced every time a picture is taken. For example, in this embodiment, a mounting portion (described later) is provided at the tip portion 11 so that the objective reflecting portion 50 can be mounted on the mounting portion. Specifically, the objective reflection portion 50 held by the holder 51 is mounted on the mounting portion together with the holder 51.

As shown in FIG. 4, the objective reflection unit 50 is held by the holder 51. The holder 51 is provided with convex portions 52a and 52b and convex portions 53. The convex portions 52a and 52b are provided on the left and right sides of the holder 51, for example, and function as gripping portions when the examiner holds the holder 51. The convex portion 53 is provided, for example, at a position where the shape of the holder 51 is asymmetric with respect to any meridian. That is, the convex portion 53 is arranged at a position where the shape of the mounting portion is not line-symmetrical. When the convex portion 52a and the convex portion 52b are provided symmetrically as in the present embodiment, the convex portion 53 is provided at a position deviating from the left-right symmetry axis V1. For example, the convex portion 53 of this embodiment is provided at a position where the angle α from the horizontal axis H around the optical axis is 60 °.

FIG. 7 is a schematic view of a mounting portion 90 provided at the tip of the tip portion 11. A holder 51 for holding the objective reflection unit 50 is mounted on the mounting portion 90. The mounting portion 90 is provided between the lens 49 and the objective reflecting portion 50 in the photographing optical system 30 of FIG.

The mounting portion 90 has, for example, a cylindrical portion 91 and a fitting portion 95. The fitting portion 95 holds the holder 51, for example, by fitting with a part of the holder 51. The fitting portion 95 is, for example, notches 92a, 92b, notches 93, and the like. The cutouts 92a and 92b are provided on the left and right sides of the peripheral edge of the cylindrical portion 91. The notch 93 is provided at a position where the shape of the mounting portion 90 is asymmetric with respect to any meridian. When the notches 92a and 92b are provided symmetrically as in the present embodiment, the convex portion 53 is provided at a position deviating from the left-right symmetry axis V2.

FIG. 8A is a perspective view of the mounting portion 90 before the holder 51 is mounted, and FIG. 8B is a perspective view of the mounting portion 90 after the holder 51 is mounted. In the case of this embodiment, as shown in FIG. 8B, the notch 92a is fitted with the convex portion 52a, the notch 92b is fitted with the convex portion 52b, and the notch 93 is fitted with the convex portion 53. do. In this way, by fitting the convex portions 52a, 52b, 53 of the holder 51 with the notches 92a, 92b, 93 of the mounting portion 90, the posture of the objective reflecting portion 50 held by the holder 51 is restricted. Will be done. Further, the position of the objective reflection portion 50 is determined by mounting the holder 51 on the mounting portion 90.

As described above, by restricting the posture of the objective reflection unit 50, a plurality of reflection surfaces provided on the objective reflection unit 50 are arranged at predetermined positions. This makes it possible to shoot an angle at a predetermined shooting position. If the angle of the objective reflection unit 50 deviates, the shooting position of the angle will deviate. By restricting the posture of the objective reflection portion 50 by the fitting portion 95 as in the present embodiment, the objective reflection portion 50 can be attached to the mounting portion 90 at a correct angle.

Further, as in the present embodiment, when three notches of the mounting portion and three convex portions of the holder are provided and they are arranged at positions that are not line-symmetrical, the front and back surfaces of the objective reflection portion 50 are mounted in opposite directions. Will not be. For example, when the front and back of the objective reflection portion 50 are to be attached to the determination, the notch 92a and the convex portion 52b are fitted, and the notch 92b and the convex portion 52a are fitted, but the notch 93 and the convex portion 53 are fitted. It does not fit because it is out of position.

If the notch 93 and the convex portion 53 are provided on the axis of left-right symmetry, the objective reflection portion 50 can be attached to the mounting portion 90 in a state of being inverted. That is, the notch 92a and the convex portion 52b are fitted, the notch 92b and the convex portion 52a are fitted, and the notch 93 and the convex portion 53 are fitted. However, when the front and back of the objective reflection unit 50 are opposite to each other, it is not possible to take a good picture of the angle. Therefore, as in the present embodiment, by providing three fitting portions 95 and arranging them at positions that are not line-symmetrical, the objective reflection portion 50 cannot be mounted upside down and the occurrence of shooting errors is prevented. can do.

In this embodiment, the mounting portion 90 and the holder 51 exert an attractive force by magnetic force so as not to be easily disengaged. For example, the mounting portion 90 includes a magnet 93a, and the holder 51 includes a magnet 53a. Of course, one of the magnets 93a and 53a may be a magnetic material such as iron.

In this embodiment, the number of notches in the convex portion of the holder 51 and the number of notches in the mounting portion 90 are three, but may be one. Even if there is only one notch and a convex portion, the rotation direction of the objective warp Y portion 50 can be regulated.

In this embodiment, the fitting portion 95 is a notch, but may be a concave portion that fits with the convex portion of the holder 51. Of course, when the holder 51 is provided with a concave portion, the fitting portion 95 may be a convex portion.

<Control system>
Next, the control system of the ophthalmic apparatus 1 will be described with reference to FIG. The ophthalmic appliance 1 includes a control unit (processor) 80. The control unit 80 executes control processing for the entire device and various arithmetic processing.

The control unit 80 may include a CPU, ROM, RAM, and the like. Temporary data used for shooting and measurement is stored in the RAM, for example.

The control unit 80 includes, for example, an alignment mechanism 5a, 5b, a monitor 8, a light source 41, a drive unit 48d, a drive unit 61a, a light receiving element 62, a light source 71, a storage device 81, an operation unit 85, etc. via a bus or the like. Be connected.

The storage device 81 is a rewritable non-volatile storage device. As the storage device 81, various storage devices such as a hard disk, a flash memory, and a USB memory can be applied. Further, the storage device 81 may store at least a program for causing the ophthalmology device 1 to perform various operations such as an imaging operation.

The angle image captured by the ophthalmologic device 1 may be stored in the storage device 81. Further, it may be displayed on the monitor 8.

The operation unit 85 is an input interface in the ophthalmic appliance 1. When the operation unit 85 is operated by the examiner, an instruction corresponding to the operation is input to the control unit 80. The operation unit 85 may be, for example, a pointing device such as a mouse and a touch panel, or a keyboard. Further, in the ophthalmic appliance 1, the joystick 7 operated for alignment may be used as one of the operation units 85.

<Operation explanation>
An operation of capturing an angle image in the ophthalmic apparatus 1 having the above configuration will be described.

At the time of shooting, first, the control unit 80 turns on the light source 71 and starts the projection of the fixation target. As a result, the line of sight of the eye E to be inspected is guided.

Next, the examiner operates the joystick 7 or the like to bring the photographing optical system 30 closer to the eye to be inspected E so that the tip of the objective reflection unit 50 is at a distance of about several millimeters from the cornea of the eye to be inspected E. Let (first alignment). At that time, the gel G is also interposed between the eye E to be inspected and the objective reflection unit 50.

After the first alignment is complete, the second alignment is performed. For example, the device may automatically detect the completion of the first alignment and start the second alignment, or the second alignment may be started by the input of a predetermined operation to the operation unit 85 as a trigger. It is also good.

Here, an example of a case where the completion of the first alignment is automatically detected is shown. For example, the control unit 80 repeatedly captures an angle image at a plurality of predetermined imaging positions while the joystick 7 or the like is operated by the examiner. Then, each angle image is processed, and it is detected whether or not the feature portion of the angle is included in the angle image. More specifically, it is confirmed whether or not each corner image contains an image feature indicating the feature portion of the corner. The first alignment may be completed when the feature portion of the angle is detected in the angle image at each imaging position. The feature portion used when determining the completion of the first alignment may be the same as the feature portion used for the second alignment described later.

In the second alignment, the positional relationship between the eye E to be inspected and the photographing optical system 30 is adjusted so that the optical axis of the objective reflection unit 50 substantially coincides with the center of the entire circumference of the angle. More specifically, when the angle images are obtained at different imaging positions due to the rotation of the optical eccentric portion 48, adjustments are made so that the predetermined feature portions are well included in each angle image.

The trabecular meshwork lies between the iris and the cornea. Since the cornea is more likely to reflect visible light than the iris, a large change in luminance is confirmed in the vicinity of the trabecular meshwork in the angle image. The position of the trabecular meshwork may be specified (detected) in.

The control unit 80 may display the captured angle image on the monitor 8. In this case, 16 corner images may be displayed side by side in the layout shown in FIG. That is, each corner image is arranged side by side in an annular shape while corresponding to the position of the imaged portion. This makes it possible for the examiner to easily confirm the state of the trabecular meshwork around the entire circumference of the angle.

Although the present disclosure has been described above based on the embodiments, the present disclosure is not limited to the above-described embodiment, and various modifications are possible.

1 Ophthalmology equipment 4, 5a, 5b Alignment mechanism 30 Imaging optical system 40 Throw optical system 48 Optical eccentric part 48d Drive unit 50 Objective optical system 60 Light receiving optical system 61 Focusing lens 61a Drive unit 80 Control unit

Claims (2)

An ophthalmic device that captures the angle of the eye to be inspected.
A projection optical system that emits illumination light to the corners of the eye to be inspected,
A cylindrical mounting portion on which an optical element, which is an objective optical element inserted on the optical axis of the floodlight optical system, can be mounted is provided.
The mounting portion is provided with a regulating means on the peripheral edge of the cylinder for regulating the rotation angle around the optical axis of the optical element at an angle at which a corner angle can be photographed at a predetermined imaging position.
The ophthalmic apparatus comprising the fitting portion that regulates the rotation angle of the optical element by fitting the regulating means with the grip portion of the holder that holds the optical element. The optical element which is an objective optical element mounted on the mounting portion in the ophthalmic apparatus according to claim 1 .
Held in the holder
An optical element characterized in that the rotation angle is regulated by fitting the grip portion of the holder with the fitting portion of the regulating means.

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