Ophthalmic devices

Abstract

An ophthalmological device 1 that comprises an objective lens 18 that is for facing an examined eye E, an alignment light emission part 4a that is for shining alignment light at the examined eye to perform alignment measurement for the objective lens 18 and the examined eye E, an alignment reflected light reception part 4b that is for receiving alignment reflected light that is alignment light that has been reflected by the examined eye, an anterior eye part camera 20 that is for receiving corneal reflected light, and a holder 25 that is located between the anterior eye part camera 20 and the objective lens 18 and holds the anterior eye part camera 20. The holder 25 of the ophthalmological device 1 comprises an imaging transmission part 19 that is for transmitting the corneal reflected light to the anterior eye part camera 20, a first light transmission part 26 that is for transmitting the alignment light from the alignment light emission part 4a, and a second light transmission part 27 that is for transmitting the alignment reflected light from the examined eye.

Description

[Technical field]

[0001] The present disclosure relates to an ophthalmic apparatus, and more particularly to an ophthalmic apparatus that examines the condition of an anterior segment and a tear film of a subject's eye. [Background technology]

[0002] Conventionally, there has been known an ophthalmologic apparatus used for diagnosing dry eye and the like by projecting illumination light onto the cornea of ​​a test eye and observing an interference image formed by the state of the anterior segment of the eye and the tear film on the cornea of ​​the test eye.

[0003] When making a diagnosis, if the ophthalmic device and the eye to be examined are not in a precise predetermined positional relationship, measurement errors will be large. Therefore, in general, an alignment measurement system is provided in the ophthalmic device to detect whether the positional relationship is correct or not (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3056799 Summary of the Invention [Problem to be solved by the invention]

[0005] However, for example, when an ophthalmic device is equipped with an anterior segment observation optical system for photographing the anterior segment and a cornea measurement optical system for measuring the tear film, and is capable of observing and photographing anterior segment images and tear images, the overall size of the ophthalmic device may become large depending on the relative positioning of the alignment measurement system, and the imaging optical system and cornea measurement optical system.

[0006] The present disclosure has been made to solve such problems, and an object of the present disclosure is to provide an ophthalmic apparatus that is compact while improving the alignment detection accuracy. [Means for solving the problem]

[0007] The ophthalmic device disclosed herein comprises an objective lens facing the test eye, an alignment light emitting unit for irradiating alignment light to the test eye to perform alignment measurement between the objective lens and the test eye, an alignment reflected light receiving unit for receiving alignment reflected light from the alignment light reflected by the test eye, an anterior eye camera for receiving corneal reflected light, and a holder located between the anterior eye camera and the objective lens and holding the anterior eye camera, wherein the holder comprises an imaging transmitting unit, a first light transmitting unit for transmitting the alignment light from the alignment light emitting unit, and a second light transmitting unit for transmitting the alignment reflected light from the test eye. Effect of the Invention

[0008] The present disclosure can provide an ophthalmic apparatus that is miniaturized while improving the alignment detection accuracy. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of an optical system of an ophthalmic apparatus according to a first embodiment of the present disclosure. [Diagram 2] 1 is a perspective view showing a main part of an optical system of an ophthalmic apparatus according to a first embodiment of the present disclosure. [Diagram 3] 1 is a schematic diagram of an optical system of an ophthalmic apparatus according to a variation of the first embodiment of the present disclosure. [Figure 4] 11 is a perspective view showing a main part of an optical system of an ophthalmic apparatus according to a second embodiment of the present disclosure. FIG. [Diagram 5] FIG. 11 is a schematic diagram showing a filter revolver according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) 1 is a schematic diagram of an optical system of an ophthalmic apparatus 1 according to a first embodiment of the present disclosure. The optical system of the ophthalmic apparatus 1 includes an anterior eye observation optical system 1a, a cornea measurement optical system 1b, a first illumination optical system 1c, and a second illumination optical system 1d.

[0011] The anterior eye observation optical system 1a includes a first lens group 18 of the present disclosure. The anterior eye observation optical system 1a also includes a third half mirror 17, an imaging lens 19a, and an anterior eye camera 20, which are arranged along the optical axis direction of the first lens group 18.

[0012] The first lens group 18 is a so-called objective lens. In this embodiment, the objective lens (first lens group 18) is composed of a plurality of lenses (18a, 18b), but the objective lens may be composed of only one lens. The first lens group 18 irradiates the corneal surface of the cornea Ea of the subject's eye E with illumination light L1 emitted from a first illumination optical system 1c described later through a third half mirror 17. Corneal reflected light R1 of the illumination light reflected by the corneal surface is incident on the first lens group 18. The corneal reflected light R1 is incident on the third half mirror 17 from the first lens group 18.

[0013] The third half mirror 17 reflects a portion of the illumination light L1 incident from the first illumination optical system 1c toward the first lens group 18. In addition, the third half mirror 17 transmits a portion (R3) of the corneal reflected light R1 incident from the first lens group 18 and emits the portion toward the imaging lens 19a, and reflects a portion (R2) of the corneal reflected light R1 toward the second lens group 16 described below.

[0014] The imaging lens 19a transmits the corneal reflected light R3 incident from the third half mirror 17 and emits it toward the anterior eye camera 20. The anterior eye camera 20 is relatively held and fixed by a holder 25, which will be described later. The anterior eye camera 20 has a CMOS (complementary metal oxide semiconductor) type or CCD (charge coupled device) type imaging element, and captures the corneal reflected light R3 incident from the imaging lens 19a and outputs an imaging signal of an observation image of the anterior eye of the subject's eye E (hereinafter referred to as an anterior eye observation image) to the control unit 10.

[0015] The first illumination optical system 1c includes a first illumination light source 11. The first illumination optical system 1c also includes a lens 12, a filter 13, a first half mirror 14, a second half mirror 15, and a second lens group 16, which are arranged along the optical path of the illumination light L1 emitted from the first illumination light source 11. The first illumination optical system 1c also shares a third half mirror 17 and the first lens group 18 with the anterior-segment observation optical system 1a. In this way, the first illumination optical system 1c forms an optical path branched off from the anterior-segment observation optical system 1a at the third half mirror 17.

[0016] The first illumination light source 11 is a light source that emits light. For example, an LED (light emitting diode) light source that emits white light and a halogen lamp are used as the first illumination light source 11, and the first illumination light source 11 emits white light as the illumination light L1 toward the lens 12. Alternatively, the first illumination light source 11 may be an LED of another wavelength, a laser light source, or a combination thereof. The lens 12 emits the illumination light L1 incident from the first illumination light source 11 toward the filter 13. The filter 13 adjusts the amount of light or the wavelength distribution, or both, of the illumination light L1 incident from the lens 12, and emits the adjusted illumination light L1 toward the first half mirror 14. The LED may be a bullet-shaped LED. Also, instead of the LED, a single halogen lamp or the like may be used.

[0017] The first half mirror 14 transmits a portion of the illumination light L1 incident from the filter 13 and emits it toward the second half mirror 15. In addition, the first half mirror 14 reflects a portion of the corneal reflected light R3 incident from a second lens group 16 (described later) via the second half mirror 15 toward the cornea measurement optical system 1b (described later).

[0018] The second half mirror 15 and the second lens group 16 emit the illumination light L1 incident from the first half mirror 14 toward the already-described third half mirror 17. Also, the second half mirror 15 and the second lens group 16 emit the corneal reflected light R3 incident from the third half mirror 17 toward the first half mirror 14.

[0019] In this manner, the illumination light L1 emitted from the first illumination light source 11 passes through the lens 12, the third half mirror 17, and then the first lens group 18 to irradiate the corneal surface of the cornea Ea. As a result, corneal reflected light R1 of the illumination light L1 reflected by the corneal surface enters the first lens group 18.

[0020] The cornea measurement optical system 1b forms an optical path branched off from the first illumination optical system 1c via a first half mirror 14. The cornea measurement optical system 1b shares the first lens group 18 to the first half mirror 14 with the first illumination optical system 1c, and includes an aperture 21, a lens 22, and a camera 23 for capturing an interference image.

[0021] The diaphragm 21 and the lens 22 emit the corneal reflected light R3 incident on the first half mirror 14 toward the camera 23 for capturing an interference image.

[0022] The interference image capturing camera 23 has a CMOS or CCD type imaging element, captures the corneal reflected light R3 incident from the lens 22, and outputs an imaging signal of the corneal reflected image to the control unit 10.

[0023] The fixation lamp 24 is a light source for fixing the position of the subject's eye E by guiding the subject's line of sight, and for accurately observing and photographing the condition of the subject's eye E. The fixation lamp 24 may be an LED (light emitting diode) light source, a halogen lamp, or the like. The light L2 emitted from the fixation lamp 24 passes through the second half mirror 15 and the second lens group 16, is reflected by the third half mirror 17, and enters the subject's eye E via the first lens group 18. That is, the light L2 from the fixation lamp 24 can be irradiated via the first lens group 18 included in an alignment adjustment system described later.

[0024] The alignment adjustment system is a mechanism including an alignment adjustment unit 40 such as a servo motor that can move the first lens group 18. By driving the servo motor electrically connected to the control unit 10 to move the first lens group 18, the relative positions of the subject's eye E and the first lens group 18 in the optical axis direction can be adjusted, and alignment adjustment of the optical system can be performed. That is, the light L2 of the fixation lamp 24 irradiated through the first lens group 18 can also be simultaneously adjusted for alignment. This allows the light L2 from the fixation lamp 24 to be focused on the fundus (retina) of the subject's eye E. Therefore, blurring of the image obtained by the anterior eye camera 20 and the coherent image capturing camera 23 due to the movement of the eyeball can be reduced while maintaining the focus state of the anterior eye.

[0025] The alignment measurement system uses an optical lever method to measure the alignment of the subject's eye E and the first lens group 18 in the optical axis direction. The alignment adjustment system adjusts the relative position (alignment adjustment) between the subject's eye E and the optical system by moving the first lens group 18 using the result of the alignment measurement. The alignment measurement system includes a holder 25 integrally formed with the imaging lens 19a, an alignment light source 4a (alignment light emitter) disposed near the anterior eye camera 20, and an alignment reflected light receiver 4b, and can perform alignment measurement. The alignment light source 4a and the alignment reflected light receiver 4b are formed integrally with the holder 25 or are fixed in relative position. This can improve the detection accuracy of the alignment.

[0026] The ghost removal light source 4 is, for example, an LED (light emitting diode) light source or a halogen lamp, and can emit illumination light L3 toward the corneal surface of the cornea Ea of the subject's eye E. The ghost removal light source 4 has an optical axis shifted from the optical axis of a first lens group 18 (second illumination optical system 1d), which will be described later.

[0027] FIG. 2 is a perspective view showing a main part of the optical system of the ophthalmic apparatus according to the embodiment of the present disclosure. FIG. 2 is a diagram showing the subject's eye E, the alignment light source 4a, the alignment reflected light receiving unit 4b, the objective lens 18a, the anterior eye camera 20, and the holder 25 of the anterior eye observation optical system 1a of the ophthalmic apparatus according to the embodiment of the present disclosure. Note that FIG. 2 shows the holder 25, the alignment light source 4a, the alignment reflected light receiving unit 4b, and the anterior eye camera 20 in a separated state in order to make it easier to understand the positional relationship between them. The holder 25 is provided with an image-capturing transmission unit 19, a first light-transmitting unit 26 for the alignment light source 4a, and a second light-transmitting unit 27. In FIG. 2, the image-capturing transmission unit 19 includes an image-capturing lens 19a that transmits the corneal reflected light R3. The first light-transmitting unit 26 is an opening formed in the holder 25 for transmitting the alignment light A1 emitted from the alignment light source 4a. The second light transmitting portion 27 is an opening formed in the holder 25 for transmitting the alignment reflected light A2. In this way, the alignment light A1 emitted from the alignment light source 4a transmits through the first light transmitting portion 26, and the alignment reflected light A2 reflected by the cornea Ea of the subject's eye E transmits through the second light transmitting portion 27 and can be received by the alignment reflected light receiving portion 4b. In this way, the first light transmitting portion 26, the second light transmitting portion 27, and the image capturing transmitting portion 19 are formed in the holder 25, and the alignment light source 4a and the alignment reflected light receiving portion 4b are fixed to the holder 25, so that the holder 25, the alignment light source 4a, and the alignment reflected light receiving portion 4b can be handled as an integrated module. Here, the alignment reflected light receiving portion 4b may be a linear sensor such as a CCD, a CMOS, or a PSD (Position Sensitive Detector) or an area sensor. Alternatively, it may have a plurality of light receiving regions.

[0028] The alignment light source 4a emits alignment light A1. The emitted alignment light A1 passes through the first light transmitting section 26 and is incident on the corneal surface of the cornea Ea from an oblique direction via the first lens group 18. When the first lens group 18 is properly aligned with the subject's eye E, the alignment reflected light receiving section 4b receives the alignment reflected light A2 reflected on the surface of the cornea Ea at a predetermined position of the alignment reflected light receiving section 4b through the second light transmitting section 27. That is, the alignment reflected light A2 reflected on the surface of the cornea Ea can be received by the alignment reflected light receiving section 4b via the first lens group 18. The alignment reflected light receiving section 4b outputs a light receiving signal of the alignment reflected light A2 to the control section 10. This allows the control unit 10 to determine whether the test eye E and the first lens group 18 are properly aligned based on whether the alignment reflected light receiving unit 4b receives the alignment reflected light A2 at an appropriate position.

[0029] In order to improve the accuracy of the alignment adjustment, it is important to accurately position the alignment light source 4a and the alignment reflected light receiving unit 4b relative to each other. Since the holder 25, the alignment light source 4a, and the alignment reflected light receiving unit 4b can be handled as an integrated module, the accuracy of the relative positions of the alignment light source 4a and the alignment reflected light receiving unit 4b can be improved. In addition, since they are configured as an integrated module, the size can be reduced compared to when the holder 25, the alignment light source 4a, and the alignment reflected light receiving unit 4b are arranged separately.

[0030] The holder 25 and the anterior eye camera 20 may be configured as an integrated module. Since the anterior eye camera 20, the alignment light source 4a, and the alignment reflected light receiving unit 4b are integrated into a module via the holder 25, the alignment accuracy for the anterior eye camera 20 can be further improved. Furthermore, during the manufacture of the ophthalmic device 1, the process load for improving the assembly accuracy (relative position) of the anterior eye camera 20, the alignment light source 4a, and the alignment reflected light receiving unit 4b can be reduced.

[0031] Although the alignment adjustment system has been described as being configured to move the first lens group 18, the relative positions of the subject's eye E (person) and the ophthalmic device 1 may be moved by moving the entire ophthalmic device 1. The control unit 10 controls the movement.

[0032] The control unit 10 detects the wavelength characteristics of the interference image at each position of the corneal reflection image based on the input image data of the corneal reflection light R2 (corneal reflection image), thereby detecting the thickness of the tear layer at each position on the corneal surface. Here, the tear layer refers to an oil layer (lipid layer), an aqueous layer, or a mucin layer, or each of these layers, or a combination of multiple layers.

[0033] As described above, since the holder 25 is provided with the first light transmitting portion 26 and the second light transmitting portion 27 for the alignment light source, the holder 25, the alignment light source 4a, and the alignment reflected light receiving portion 4b can be handled as an integrally configured module, and the size can be reduced while improving the alignment detection accuracy. By improving the alignment detection accuracy, the anterior eye camera 20 can capture the corneal reflected light R3 to obtain a proper observation image of the anterior eye of the subject's eye E. In addition, the corneal reflected light R2 captured by the interference image capturing camera 23 can be made proper, and the interference fringes formed by the tear layer can be accurately observed.

[0034] The imaging transmission section 19 may be formed as an opening in the holder 25, or may include a filter member that selectively transmits the corneal reflected light R3. The first light transmission section 26 and the second light transmission section 27 may include a lens, or may include a filter member that selectively transmits light.

[0035] Here, the first illumination light source 11 according to the present disclosure is a light source composed of a single LED. Therefore, even when the illumination light L1 emitted from the first illumination light source 11 passes through the first lens group 18 and reaches the cornea Ea, the shape of the single light source is projected.

[0036] In contrast, as a comparative example, a case where a plurality of light sources, for example, nine LEDs arranged in a matrix of 3×3, are used as the first illumination light source 11 will be described. When the illumination light emitted by the first illumination light source 11 according to the comparative example reaches the cornea Ea through the first lens group 18, the light from the plurality of LED point light sources is condensed by the first lens group 18, resulting in dark areas occurring in areas adjacent to the plurality of LEDs, that is, stripe-like illuminance differences, which are projected as vaguely visible stripes on the cornea Ea. Therefore, the corneal reflected light R1 from the cornea also has this stripe-like illuminance difference. As a result, there is a risk that the illumination of the cornea of ​​the test eye will be shaded, making it impossible to accurately measure the thickness of the tear film on the corneal surface.

[0037] In contrast, according to the present disclosure, the cornea is measured by illuminating it with a single light source, so that striped illuminance differences do not occur on the cornea and the tear film thickness on the corneal surface can be accurately measured.

[0038] In addition, by superimposing and irradiating light L2 from the fixation lamp 24 through the first lens group, which is the optical system of the alignment adjustment system, the focus state is maintained, reducing blurring caused by eye movement, and making it possible to accurately observe interference fringes formed by the tear layer of the cornea Ea of the test eye E.

[0039] The control unit 10 can also switch between the first illumination light source 11 and the ghost removal light source 4 (second illumination light source) to irradiate illumination light. Therefore, it is possible to switch between a ghost reduction mode and a mode in which light is irradiated to the center of the subject's eye E depending on the examination.

[0040] By irradiating the illumination light L3 from the ghost removal light source 4, the position of a ghost caused by the illumination light L3 being reflected at the anterior eye can be shifted from the optical axis of the anterior eye camera 20. This makes it possible to prevent the ghost from entering the field of view of the anterior eye camera 20. This makes it possible to accurately inspect the cornea and tear film near the center of the subject's eye E and to obtain a more accurate corneal image.

[0041] 3, the illumination light L3 emitted from the ghost removal light source 4 (second illumination light source) may have an optical axis that irradiates the cornea Ea of the subject's eye E from below. Also, the ghost removal light source 4 may be configured to have an optical axis that irradiates from a horizontal direction with respect to the central optical axis of the first lens group 18.

[0042] Second embodiment 4 is a perspective view showing a main part of an optical system of an ophthalmic apparatus 1 according to a second embodiment of the present disclosure. The difference from the first embodiment is that a filter revolver 31 is disposed between a holder 25 and an objective lens 18a.

[0043] FIG. 5 is a schematic diagram of the filter revolver 31 as viewed from the front. The filter revolver 31 is a substantially cross shape with four notches (cutout portions 34) cut out from a substantially circular shape. The filter revolver 31 has four types of imaging system filters 32 attached thereto, and can rotate around a rotation center 33. One of the four types of imaging system filters 32 is disposed so as to be on the optical axis of the imaging lens 19a. The four types of filters are configured with filters that transmit different wavelengths of light, and by rotating the filter revolver 31, it is possible to select the wavelength of the corneal reflected light R3 that transmits to the anterior eye camera 20 via the imaging lens 19a. The revolver transmission portion 35 is an area configured by the cutout portions 34 of the filter revolver 31. The imaging system filter 32 is disposed between two adjacent revolver transmission portions 35. That is, the filter revolver 31 has a plurality of cutout portions 34, and the imaging system filter 32 is disposed between at least two cutout portions 34. The shape of the filter revolver is not limited to a substantially cross shape, but may be a substantially Y shape or another shape. The types of filters are not limited to four, and the number of filters is not limited to four.

[0044] 4, when the filter revolver 31 is viewed from the front, the first light transmitting portion 26, the second light transmitting portion 27, and the revolver transmitting portion 35 of the holder 25 are arranged at overlapping positions. Therefore, the alignment light irradiated from the alignment light source 4a passes through the first light transmitting portion 26 and the revolver transmitting portion 35 formed in the holder 25, and enters the corneal surface of the cornea Ea from an oblique direction as alignment light A1 via the first lens group 18 (objective lens 18a). When the first lens group 18 is aligned with the subject's eye E, the alignment reflected light receiving portion 4b receives the alignment reflected light A2 of the alignment light reflected by the surface of the cornea Ea as the alignment reflected light A2 through the revolver transmitting portion 35 and the second light transmitting portion 27. That is, the alignment reflected light A2 reflected from the surface of the cornea Ea can be received by the alignment reflected light receiving unit 4b via the first lens group 18. This makes it possible to determine whether or not the subject's eye E and the first lens group 18 are aligned based on whether or not the alignment reflected light receiving unit 4b receives the alignment reflected light A2.

[0045] As described above, the filter revolver 31 equipped with the imaging system filter 32 has a revolver transmission section 35 formed of a notch section 34 that transmits the alignment light A1 and the alignment reflected light A2. Therefore, when the imaging system filter 32 is disposed on the optical axis of the imaging lens 19a and the anterior eye camera 20, the alignment light A1 and the alignment reflected light A2 are not blocked by the filter revolver 31. Therefore, the filter revolver 31, the anterior eye camera 20, the alignment light source 4a, and the alignment reflected light receiving section 4b can be located close to each other, and the entire ophthalmic apparatus can be made compact. [Explanation of symbols]

[0046] 1:Ophthalmological equipment 1a: Anterior segment observation optical system 1b: Keratometry optical system 1c: First illumination optical system 1d: Second illumination optical system 4: Anti-ghost light source 4a: Alignment light source 4b: Alignment reflected light receiving section 10: Control section 11:Lighting source 12: Lens 13: Filter 14: First half mirror 15: Second half mirror 16: Second lens group 17: Third half mirror 18: First lens group 18a: Objective lens 19: Imaging transmission section 19a: Imaging lens 20: Anterior eye camera 21: Aperture 22: Lens 23: Camera for capturing interference images 24:Fixation light 25: Holder 26: 1st light transmitting part 27:Second light transmitting part 31: Filter revolver 32: Imaging system filter 33: Center of rotation 34: Notch 35: Revolver transmission part 40: Alignment adjustment section

Claims

1. an objective lens for facing the subject's eye; an alignment light emitting unit for irradiating the subject's eye with alignment light in order to perform alignment measurement between the objective lens and the subject's eye; an alignment reflected light receiving unit for receiving alignment reflected light that is the alignment light reflected by the subject's eye; an anterior eye camera for receiving corneal reflected light; a holder positioned between the anterior eye camera and the objective lens and holding the anterior eye camera; a filter revolver having a plurality of filters rotatably supported between the objective lens and the holder; An ophthalmic apparatus comprising: the holder includes an image capturing transmission section for transmitting the corneal reflected light to the anterior eye camera, a first light transmitting section for transmitting the alignment light from the alignment light emitting section, and a second light transmitting section for transmitting the alignment reflected light from the subject's eye, the alignment light passes through the first light transmitting portion and is incident on a corneal surface of the subject's eye from an oblique direction via the objective lens; the alignment reflected light passes through the objective lens, passes through the second light transmitting section, and is received by the alignment reflected light receiving section; the imaging transmission part and the anterior eye camera are arranged along an optical axis direction of the objective lens, the corneal reflected light is incident on the objective lens, passes through the image capturing transmission portion, and is received by the anterior eye camera; the filter revolver is capable of aligning one of the plurality of filters with an optical axis of the anterior eye camera by rotating the filter revolver; the filter revolver has a plurality of cutout portions, and the filter is disposed between at least two of the cutout portions; the cutout portion, the first light transmitting portion, and the second light transmitting portion are arranged in an overlapping position. Ophthalmology equipment.

2. 2. The ophthalmic apparatus according to claim 1, wherein the holder, the alignment light emitter, and the alignment reflected light receiver are integrally configured.

3. The ophthalmologic apparatus according to claim 1 , wherein the holder comprises a lens that constitutes the first light transmitting portion and / or the second light transmitting portion.

4. The ophthalmic apparatus according to claim 1 , wherein the holder includes the first light transmitting portion and / or the second light transmitting portion formed as an opening.

5. The ophthalmic apparatus according to claim 1 , wherein the holder includes a filter member that selectively transmits light in the first light transmitting portion and / or the second light transmitting portion.

6. The ophthalmologic apparatus according to claim 1 , wherein the holder and the anterior eye camera are integrally configured.

7. The ophthalmologic apparatus according to claim 1 , wherein the holder includes the image-capturing transmission portion configured by a lens.

8. The ophthalmic apparatus according to claim 1 , wherein the holder includes the imaging transmission portion formed as an opening.

9. The ophthalmologic apparatus according to claim 1 , wherein the holder includes a filter member for selectively transmitting light in the image capturing transmission portion.

10. a first illumination optical system for irradiating the cornea of ​​the subject's eye with illumination light emitted from a first illumination light source with an optical axis overlapping with an optical axis center of the objective lens; The ophthalmic apparatus according to claim 1 , wherein the first illumination optical system has only a single light source.

11. The ophthalmic device according to claim 10 , wherein the single light source is a bullet-type LED.

12. a first illumination light source for irradiating an illumination light onto a cornea of ​​a subject's eye; an alignment adjustment unit capable of adjusting a position of the objective lens in order to adjust a relative position between the subject's eye and the objective lens; a fixation lamp having a light source different from the first illumination light source; An ophthalmic apparatus comprising: The ophthalmic apparatus according to claim 1 , wherein the fixation lamp irradiates light that is focused on a retina of the subject's eye via the objective lens.

13. a first illumination optical system for irradiating the cornea of ​​the subject's eye with illumination light emitted from a first illumination light source with an optical axis overlapping with an optical axis center of the objective lens; a second illumination optical system for irradiating the cornea of ​​the subject's eye with illumination light emitted from a second illumination light source at an optical axis center different from the optical axis center of the objective lens; a control unit for controlling the first illumination light source and the second illumination light source; Further comprising: The ophthalmologic apparatus according to claim 1 , wherein the control unit is capable of switching between the first illumination light source and the second illumination light source to emit illumination light.

14. The ophthalmic apparatus according to claim 13 , wherein the second illumination light source irradiates the cornea of ​​the subject's eye with illumination light without passing through an objective lens.

Images