JP7785604B2 - Ophthalmic device and lighting control method - Google Patents

Description

This disclosure relates to an ophthalmic device and a lighting control method.

Ophthalmic devices such as slit lamp microscopes that have a light source for background illumination have been proposed. Background illumination is used to confirm the position on the subject's eye where slit light is irradiated during observation of the subject's eye, and to prevent overexposure when photographing the subject's eye. For example, Patent Document 1 discloses an ophthalmic device (slit lamp microscope) with background illumination installed above the observation system. When turned on, the background illumination of this ophthalmic device is positioned to emit illumination light diagonally downward so that it passes above the deflection optical system (illumination system), avoiding blocking of the illumination light by the illumination system and reaching the subject's eye.

Japanese Patent Application Laid-Open No. 2020-141998

However, in the ophthalmologic apparatus of Patent Document 1, illumination light is irradiated onto the subject's eye from above, which can cause the eyelid to cast a shadow on the observation area of the subject's eye. As a result, it is sometimes impossible to properly observe the observation area, such as the anterior segment of the eye.

The present disclosure aims to provide an ophthalmic device and lighting control method that enables more accurate observation of the subject's eye by suppressing the occurrence of shadows on the eyelids while avoiding the blocking of background illumination light from the illumination system.

To achieve the above-mentioned objectives, the ophthalmic device disclosed herein comprises an illumination system rotatably supported around the subject's eye while directing the irradiation direction of first illumination light toward the subject's eye, an observation system provided on the opposite side of the illumination system from the position of the subject's eye, and a light-emitting unit for background illumination provided in the observation system at a position below the subject's eye, and has an avoidance operation function that moves the light-emitting unit according to the position of the illumination system to prevent the second illumination light emitted from the light-emitting unit from being blocked by the illumination system.

To achieve the above-mentioned objective, the illumination control method disclosed herein is an ophthalmic apparatus including an illumination system rotatably supported around the subject's eye while directing the irradiation direction of first illumination light toward the subject's eye, an observation system provided on the opposite side of the illumination system from the position of the subject's eye, and a light-emitting unit for background illumination provided in the observation system at a position below the subject's eye. The illumination control method moves the light-emitting unit according to the position of the illumination system to prevent the second illumination light emitted from the light-emitting unit from being blocked by the illumination system.

The ophthalmic apparatus disclosed herein can provide an ophthalmic apparatus and lighting control method that can prevent the illumination system from blocking background illumination light, suppress the occurrence of shadows on the eyelids, and enable more accurate observation of the subject's eye.

1 is a side view of an ophthalmic apparatus according to a first embodiment of the present disclosure. 2 is a perspective view of an illumination system and an observation system of the ophthalmic apparatus of the first embodiment, as viewed from the subject side. FIG. 10 is a schematic plan view showing a state in which a lighting device is attached to each of a wide camera device and a narrow camera device (Modification 1 of Embodiment 1). FIG. FIG. 2 is a front view showing a state in which an illumination system of the ophthalmologic apparatus according to the first embodiment has been moved. 2 is a plan view showing the positional relationship between an eye to be examined, an illumination system, and a light-emitting unit in the ophthalmologic apparatus of the first embodiment. FIG. FIG. 2 is a control block diagram of the ophthalmologic apparatus. 4 is an operation flowchart of the ophthalmologic apparatus according to the first embodiment. FIG. 10 is a diagram illustrating a second modification of the ophthalmologic apparatus according to the first embodiment. 10A and 10B are enlarged views of a rotary shaft to which an optical encoder is attached in an ophthalmologic apparatus according to a second embodiment, and a rotary shaft to which a magnetic encoder according to a first modified example of the second embodiment is attached. 10 is a flowchart illustrating an operation of an ophthalmologic apparatus according to a second embodiment. 10A and 10B are front views illustrating ophthalmologic apparatuses according to Modifications 2 and 3 of the second embodiment. FIG. 11 is a perspective view of an illumination system and an observation system of an ophthalmic apparatus according to a third embodiment, as viewed from the patient side. FIG. 13 is a front view illustrating an ophthalmologic apparatus according to a first modified example of the third embodiment. FIG. 10 is a front view of an ophthalmologic apparatus according to a fourth embodiment. FIG. 10 is a front view of an ophthalmologic apparatus according to a fourth embodiment.

(Embodiment 1)
Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. In the following description, the subject side of the ophthalmic device 10 will be referred to as the front, the opposite side (the examiner side) as the back, the left side as seen from the subject side as the left, and the opposite side as the right. In addition, the upper side of the ophthalmic device 10 in FIG. 1 will be referred to as the top, and the opposite side as the bottom.

First, the configuration of the ophthalmic device 10 will be described. Figure 1 is a side view of the ophthalmic device 10A (10). As shown in Figure 1, the ophthalmic device 10A of this embodiment is a so-called Zeiss-type (Littman-type) slit lamp microscope, and includes a base 12, a face support unit 14, an electric drive unit 16, a movable table 18, an operating lever 20, a first support member 22, a microscope support arm 24, a rotating shaft 26, a second support member 28, a rotating shaft 30, an illumination system 32, an observation system 34 (microscope unit), an illumination device 36 for background illumination, and a light source operating unit 38.

The base 12 can be placed on an optometry table (not shown). The face support unit 14 is provided above the base 12. The electric drive unit 16 and light source operation unit 38 are provided on the upper surface of the base 12. The movable table 18 is held so that it can move freely in the horizontal direction (front-to-back direction Dy and left-to-right direction Dx). The front-to-back direction Dy is the forward direction approaching the subject and the rear direction away from the subject, and the left-to-right direction Dx is the interpupillary direction of the subject.

The face support unit 14 has a pair of support posts 14a fixed to the base 12 and extending in the vertical direction, a chin rest 14b provided in the vertical middle of the pair of support posts 14a, and a forehead rest 14c provided at the vertical upper end of the pair of support posts 14a. The subject's face is supported by the face support unit 14 when the subject places their chin on the chin rest 14b and their forehead on the forehead rest 14c. This fixes the position of the subject's eye E. The subject's eye E is fixed so that it is positioned approximately above the rotation axis 26 and the rotation axis 30.

The electric drive unit 16 is a movement mechanism that moves the movable table 18 horizontally (left-right direction Dx and front-back direction Dy) on the base 12. The operating lever 20 is provided above the movable table 18, at the rear end on the rear side (examiner side). Furthermore, a first support member 22 is provided on the upper surface of the movable table 18 so as to be movable up and down (raise and lower).

The electric drive unit 16 includes multiple motors (not shown) and a drive transmission mechanism (not shown) that converts the rotation of each motor into drive force in the horizontal direction (Dx, Dy) and the vertical direction Dz. The electric drive unit 16 has the function of moving the movable table 18 in the horizontal direction (Dx, Dy) in response to operation of the operating lever 20, and the function of moving the first support member 22 in the vertical direction Dz. This makes it possible to adjust the position of the first support member 22 (illumination system 32 and observation system 34) relative to the subject's eye E.

The operating lever 20 is an operating member for manually moving the first support member 22 (illumination system 32 and observation system 34) in the horizontal direction (Dx, Dy) and the up-down direction Dz. For example, when the operating lever 20 is tilted in the forward-backward direction Dy or the left-right direction Dx, the electric drive unit 16 moves the movable table 18 in the forward-backward direction Dy or the left-right direction Dx. Furthermore, when the operating lever 20 is rotated around its axis, the electric drive unit 16 moves the first support member 22 in the up-down direction Dz. A switch 20a used for photography, etc., is provided at the top of the operating lever 20.

A microscope support arm 24 is provided on the first support member 22. This microscope support arm 24 has a horizontal arm portion 24a and a vertical arm portion 24b, and is formed in a roughly L-shape when viewed from the side, as shown in Figure 1.

The front end (toward the eye E) of the horizontal arm 24a is attached to the first support member 22 via a rotation shaft 26 extending in the vertical direction Dz, allowing horizontal rotation (rotation on a horizontal plane as the rotation plane). The second support member 28 is attached to the first support member 22 via a rotation shaft 30 located on an extension of (i.e., approximately coaxial with) the rotation shaft 26 of the horizontal arm 24a, allowing horizontal rotation.

The horizontal rotation of the microscope support arm 24 around the rotation axis 26 and the horizontal rotation of the second support member 28 around the rotation axis 30 may be performed manually by the examiner or electrically using an electric rotation mechanism (not shown).

An observation system 34, which is a microscope unit, is attached to the upper end of the vertical arm portion 24b. An illumination system 32 is also provided on the second support member 28.

The illumination system 32 includes a slit lamp 44 that emits first illumination light L1 and a deflection optical system 46. The slit lamp 44 emits slit light as the first illumination light L1 toward the deflection optical system 46. The deflection optical system 46 is located above the slit lamp 44 and includes a deflection unit 48 located above the slit lamp 44 that deflects the first illumination light L1 toward the subject's eye E. The deflection unit 48 is composed of a deflection optical element such as a mirror (reflector) or a prism, and deflects (guides) the first illumination light L1 emitted from the slit lamp 44 toward the subject's eye E. This allows the first illumination light L1 to be irradiated onto the subject's eye E. In this embodiment, a prism is used as the deflection optical element. The slit lamp 44 and the deflection optical system 46 are not limited to those shown in FIG. 1 , and there are no particular limitations on their shape, structure, or arrangement as long as they are configured to be usable in a Zeiss-type slit lamp microscope.

The illumination system 32 rotates horizontally together with the second support member 28 around the rotation axis 30. The face support section 14 fixes the face so that the subject's eye E is positioned approximately above the rotation axis 30, so the illumination system 32 is supported so that it can rotate around the subject's eye E while directing the irradiation direction of the first illumination light L1 toward the subject's eye E. This makes it possible to adjust the irradiation direction (incident angle) of the first illumination light L1 relative to the subject's eye E.

The observation system 34 is provided on the opposite side of the illumination system 32 from the position where the subject's eye E is positioned. The observation system 34 is used to observe the subject's eye E, which is illuminated with the first illumination light L1 emitted from the illumination system 32 and various lights emitted from the illumination device 36 described below. An objective lens 50, which serves as a light-receiving unit, is provided at the front end of the observation system 34 (toward the subject's eye E), and an eyepiece lens 52 is provided at the rear end of the observation system 34 (toward the examiner). The symbol LA in Figure 1 is the axis connecting the subject's eye E and the objective lens 50 (light-receiving unit), and is the optical axis (observation axis) of the objective lens 50.

The observation system 34, for example, adjusts the magnification of light received by the objective lens 50 and guides it toward the examiner (the rear side of the ophthalmic device 10), where it exits from the eyepiece 52. The observation system 34 can also be rotated horizontally together with the microscope support arm 24 around the rotation axis 26. Therefore, the observation system 34 can adjust the observation direction of the subject's eye E.

The observation system 34 of this embodiment also has a camera device 56 that captures an image of the subject's eye E via the optical system of the observation system 34. The camera device 56 is provided on the opposite side of the observation system 34 from the subject's eye E (or the objective lens 50). The camera device 56 is, for example, a digital camera. The camera device 56 is formed to be elongated and is detachably attached to the housing of the observation system 34 (to the vertical arm portion 24b in the example of Figure 1) with its major axis facing the up-down direction Dz.

The camera device 56 includes an imaging unit 561 (not shown) that receives and images the first illumination light L1 reflected by the subject's eye E, a power supply circuit 562, and a control circuit 563. The imaging unit 561 is an imaging element such as a CMOS image sensor or a CCD image sensor. A portion of the first illumination light L1 incident on the camera device 56 via the objective lens 50 is guided to the imaging unit 561 by a half mirror or the like and imaged. Another portion of the first illumination light L1 is guided toward the eyepiece 52. The power supply circuit 562 is a circuit that supplies driving power to the camera device 56. The power supply circuit 562 may be configured as a circuit that distributes a portion of the power supplied from the ophthalmic device 10 to each functional unit, or may be configured to include a battery, a transformer, or a power generation circuit.

The illumination device 36 is provided in the observation system 34, which is located below the subject's eye E. Figure 3 is a schematic plan view of the observation system 34A (34), in which the illumination device 36A is attached to the wide camera device 56 of this embodiment. The ophthalmic device 10A in Figure 1 has the observation system 34A. The illumination device 36A of the observation system 34A has an elongated illumination main body 361 provided with multiple light-emitting units 363 (details will be described later) for background illumination, and arms 362 extending rearward from both ends of the illumination main body 361. The illumination device 36A is formed in a roughly U-shape in plan view, with the illumination main body 361 and arms 362 connected at a roughly right angle.

The camera device 56 in the observation system 34A of this embodiment has the aforementioned imaging unit 561 and light-emitting unit 363. The illumination device 36A is connected and fixed to the camera device 56. For example, the illumination device 36A is connected to the camera device 56 so that the arm 362 of the U-shaped illumination main body 361 sandwiches the vertical arm 24b of the observation system 34A. The camera device 56 is wider than the vertical arm 24b in the direction of movement of the illumination system 32 as viewed from the subject's eye E, and is configured to be insertable and removable (detachable) from the subject's eye E. In the example of the observation system 34A, the illumination device 36A is fixed to the camera device 56 by connecting the insertion portion 362a (e.g., a jack) provided at the end of the arm 362 to the insertion portion 56a (e.g., a receptacle) provided on the camera device 56. The underside of the lighting main body 361 may also be supported by a support protrusion that protrudes forward from the front side surface of the vertical arm 24b.

In addition, the lighting device 36A can receive power from the power supply circuit 562 of the camera device 56 via a wiring cable that runs through the inside of the arm portion 362. Furthermore, the control circuit of the lighting device 36 may share a circuit board with the control circuit 563 of the camera device 56, or may be housed on a circuit board separate from the circuit board of the control circuit 563 for the camera device 56 within the housing of the camera device 56. By housing the circuit board of the control circuit of the lighting device 36 within the housing of the camera device 56, the lighting device 36 and the camera device 56 as a whole can be made smaller.

The light-emitting unit 363 has a light source that can selectively emit different types of light (e.g., three types of light: visible light, infrared light, and excitation light) to the subject's eye E. In this embodiment, as shown in FIG. 2, an infrared light source 363a that can emit infrared light and a visible light source 363b that can emit visible light are arranged above and below on the front side of the illumination main body 361.

The light source control unit 38 is provided on the rear side (examiner side) of the top surface of the base 12. This light source control unit 38, which will be described in detail later, is used by the examiner to turn the slit lamp 44 on or off and adjust the light intensity, as well as to turn the light emitter 363 on or off and adjust the light intensity.

Figure 4 is a front view of the illumination system 32 and observation system 34 as viewed from the examinee (examined eye E). Figure 4 shows ophthalmic devices 10A and 10B, in which the illumination system 32 is positioned differently relative to the observation system 34. Multiple light-emitting units 363 are provided in the left-right direction Dx, which is the direction in which the illumination system 32 can move as viewed from the examinee's eye E. In other words, the illumination system 32 is configured to be movable in the arrangement direction of the light-emitting units 363. In this embodiment, the light-emitting unit 363 has one infrared light source 363a and one visible light source 363b, which are the same type of light source, arranged at both ends on the right and left sides when viewed from the front. The visible light source 363b is arranged above the infrared light source 363a.

Figure 5 is a plan view of the illumination system 32 and the observation system 34. In a plan view seen from the direction of the rotation axis 30 of the illumination system 32, the light-emitting unit 363 is positioned outside the shading angle θ formed by two tangent lines L3 of the illumination system 32 when the illumination system 32 is positioned on the observation axis LA connecting the origin O, which is the position of the subject's eye E (a reference position for the subject's eye E, such as the approximate center of the subject's eye E or the position of the anterior segment of the eye), and the objective lens 50, which is the light-receiving unit of the observation system 34. Therefore, as shown in Figure 5, when the illumination system 32 is positioned approximately on the observation axis LA, the subject's eye E can be irradiated with the second illumination light L2 as background illumination from both light-emitting units 363, which are positioned at both ends of the illumination device 36 in the left-right direction Dx.

Figure 6 is a schematic diagram of the light source control unit 38 and control device 40 provided in the ophthalmic device 10A (10). The light source control unit 38 includes a slit lamp light source control unit 381, an infrared light source control unit 382, and a visible light source control unit 383. The ophthalmic device 10A also includes a storage device (also referred to as a storage medium) (not shown) that stores control programs for executing the various functions of the ophthalmic device 10A.

The slit lamp light source operation unit 381 accepts an on/off operation for the slit lamp 44 and an operation to adjust the light intensity of the first illumination light (slit light) emitted from the slit lamp 44. The infrared light source operation unit 382 accepts an on/off operation for the infrared light source 363a and an operation to adjust the light intensity of the infrared light emitted from the infrared light source 363a. The visible light source operation unit 383 accepts an on/off operation for the visible light source 363b and an operation to adjust the light intensity of the visible light emitted from the visible light source 363b.

The control device 40 is provided, for example, within the movable table 18 (or may be located outside the ophthalmic device 10A) and controls the overall operation of each part of the ophthalmic device 10A. This control device 40 is a computing device such as a personal computer, and is equipped with an arithmetic circuit composed of various processors, memories, etc. The various processors include a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an ASIC (Application Specific Integrated Circuit), and a programmable logic device (e.g., an SPLD (Simple Programmable Logic Device), a CPLD (Complex Programmable Logic Device), and an FPGA (Field Programmable Gate Array)). The various functions of the control device 40 may be implemented by a single processor, or by multiple processors of the same or different types.

The control device 40 drives the electric drive unit 16 to move the movable table 18 in the forward/backward direction Dy or the left/right direction Dx in response to tilting of the operating lever 20 in the forward/backward direction Dy or the left/right direction Dx, and drives the electric drive unit 16 to move the first support member 22 in the up/down direction Dz in response to rotation of the operating lever 20 about its axis.

The control device 40 also controls the on/off of the slit lamp 44, infrared light source 363a, and visible light source 363b, and the adjustment of the light intensity of the light emitted from each light source, in response to on/off operations and light intensity adjustment operations input to the light source operation unit 38. This allows the examiner to easily switch the light source on or off corresponding to the on/off operation, and adjust the light intensity of the light emitted from the light source corresponding to the light intensity adjustment operation. Therefore, the control device 40 functions as the light source control unit of the present invention. This makes it easier to switch the light source and adjust the light intensity, etc., compared to manual operations (e.g., filter switching, etc.).

Returning to Figure 4, the ophthalmic device 10A-1 (10A) is shown in a state in which an illumination device 36A that is wide in the left-right direction Dx is attached to the observation system 34, and the illumination system 32 is positioned approximately on the observation axis LA. In the ophthalmic device 10A-1, even if the observation system 34 is displaced to some extent in the left-right direction Dx relative to the observation axis LA, the subject's eye E can be irradiated with the second illumination light L2 from the light-emitting units 363 on both the left and right ends.

Furthermore, as in the ophthalmic device 10A-2 (10A) in Figure 4, when the illumination system 32 moves relative to the observation system 34, one of the left and right light-emitting units 363 may be blocked by the illumination system 32. However, the ophthalmic device 10A-2 (10A) of this embodiment has multiple light-emitting units 363 in the left-right direction Dx, so the second illumination light L2 emitted from at least some of the light-emitting units 363 (in Figure 4, the right light-emitting unit 363) can be irradiated onto the subject's eye E regardless of the position of the illumination system 32.

Here, an example of an operational flowchart of the ophthalmic device 10A will be described with reference to Figure 7. Note that in the flowchart of Figure 7, steps S08 and S09 are described as an example in which the ophthalmic device 10A is operated semi-manually (or semi-automatically by the control device 40) using the operating lever 20 or the light source operating unit 38, etc., but other processes may be performed either manually or automatically by the control device 40.

First, in step S01, the subject places their chin on the chin rest 14b to support their face and fix the position of the subject's eye E. In step S02, the examiner or other user turns on the power to the illumination system 32 (switches it to "ON") by operating the operating lever 20, etc.

In step S03, the user adjusts the position and angle of the illumination system 32 by operating the operating lever 20, etc., to match the position of the subject's eye E. In step S04, the user adjusts the alignment of the ophthalmic device 10A. In step S05, the user adjusts the slit width of the first illumination light L1 irradiated onto the subject's eye E, etc., by operating the light source operating unit 38, etc., and in step S06, adjusts the brightness of the first illumination light L1, etc.

In step S07, the user confirms the emission angle of the first illumination light L1 from the illumination system 32 to the subject's eye E relative to the observation axis LA, and the ophthalmic device 10A adjusts the position of the illumination system 32 by user operation so that the illumination system 32 is at an arbitrary position (i.e., at an arbitrary angle relative to the observation axis LA).

In step S08, the control device 40 turns on (or switches to "ON") any of the background illumination light sources in response to a user's operation of the light source operation unit 38. Whether the infrared light source 363a or the visible light source 363b of the light-emitting unit 363 is turned on may be set manually by a user's operation, or may be automatically determined and set by the control device 40.

In step S09, the control device 40 dims the light source for background illumination that has been turned on. The ophthalmic device 10A of this embodiment has a function for dimming the light-emitting unit 363 depending on the relative positions of the illumination system 32 and the light-emitting unit 363. The dimming function is performed by the user via the light source operation unit 38 while checking an image of the subject's eye E using, for example, the eyepiece 52 (see FIG. 1) or an external monitor (not shown).

When the user operates the light source operation unit 38, the control device 40 can turn on the left and right light-emitting units 363 when the illumination system 32 is positioned on the observation axis LA side and the second illumination light L2 emitted from the left and right light-emitting units 363 can be irradiated onto the subject's eye E (see the ophthalmic device 10A-1 in Figure 4).

On the other hand, when observing the subject's eye E, the illumination system 32 is mainly positioned off (away from) the observation axis LA connecting the subject's eye E and the objective lens 50, which is the light-receiving unit of the observation system 34, and irradiates the subject's eye E with first illumination light L1 from a direction tilted relative to the observation axis LA. Therefore, when the illumination system 32 is positioned to the left (or right) of the observation axis LA and the second illumination light L2 emitted from some of the light-emitting units 363 is blocked (see the ophthalmic device 10A-2 in Figure 4), the light-emitting units 363 from which the second illumination light L2 is blocked are turned off. This reduces unnecessary power consumption by the ophthalmic device 10A.

In step S10, the camera device 56 is operated by inputting an operation to the operating lever 20, and an image of the subject's eye E is captured. The captured image is stored in a storage device or the like of the ophthalmic device 10A.

The above describes the ophthalmic device 10A of this embodiment. In the conventional ophthalmic device exemplified in Patent Document 1, an operator such as an ophthalmologist or nurse had to operate an illumination adjustment device located away from their hand to turn the background lighting power on or off and control the dimming, which was cumbersome. Furthermore, the power supply for the illumination device for background lighting was sometimes configured to receive power through wiring separate from the power supply used for other components of the ophthalmic device. Therefore, two systems of wiring had to be drawn out from the ophthalmic device, which required space for installation of the ophthalmic device, increased wiring costs, and was not economical.

In the ophthalmic device 10A of this embodiment, the lighting device 36A is connected to the camera device 56, allowing the user to adjust the background illumination at hand. Furthermore, the power supply for the second illumination light L2 can also be used as the power supply for the camera device 56, which is expected to reduce wiring and space. In conventional configurations, the lighting device for background illumination was attached to the top of the observation system, which meant the top of the observation system housing was relatively high. This sometimes made it difficult to install equipment such as an applanation tonometer. However, the ophthalmic device 10A allows the lighting device 36 and the camera device 56 to share the same control circuit and power circuit board, thereby reducing costs, reducing wiring, and downsizing (saving space) while still providing lighting and imaging functions.

In this embodiment, the illumination device 36A is configured to be insertable and removable (detachable) from the examinee's eye E side, but this is not limiting. For example, the illumination device 36A may be configured to be insertable and removable (detachable) from the examiner's side, the right or left side, or top of the ophthalmic device 10, or any other direction relative to the camera device 56.

(Modification 1 of Embodiment 1)
3, in the present embodiment, the illumination device 36 is configured to be insertable into and removable from the subject's eye E side of the camera device 56, which is wider than the vertical arm portion 24b. However, as shown in the observation system 34B in Fig. 3, the camera device 56 may be configured so that its left-right width is narrower than that of the illumination device 36B, and the insertion portion 362a may be connected to insertion portions 56a formed on the left and right sides of the camera device 56. When the illumination device 36B is connected to the camera device 56, unintentional detachment of the illumination device 36B can be prevented.

(Modification 2 of Embodiment 1)
FIG. 8 is a front view of an ophthalmic apparatus 10C (10) having an illumination system 32C (32) that is taller than the observation system 34 shown in FIG. 1 . In the description of the ophthalmic apparatus 10C, components similar to those of the ophthalmic apparatus 10A are denoted by the same reference numerals, and their description will be omitted or simplified. The ophthalmic apparatus 10C includes a so-called tower-type illumination system 32C instead of the illumination system 32A of the first embodiment. The illumination system 32C includes two support columns 32C1 spaced apart to open the periphery of the observation axis LA in the front view of FIG. 8 . The lower portion of each support column 32C1 is supported by the second support member 28 shown in FIG. 1 (details not shown), and is rotatably connected to the pivot shaft 30. A slit lamp 44 and an illumination optical system 46C are disposed on the upper portion of the support column 32C1. The illumination optical system 46C of the illumination system 32C is provided below the slit lamp 44 and has a deflection unit 48C located below the slit lamp 44 that deflects the first illumination light L1 toward the subject's eye E. The deflection unit 48C is supported by the second support member 28 (see also FIG. 1 ) of the illumination system 32C, but detailed illustration of the support structure is omitted. The deflection unit 48C has the same function as the deflection unit 48 described above and is, for example, a mirror (reflecting mirror) or a prism, and deflects (guides) the first illumination light L1 emitted from the slit lamp 44 toward the subject's eye E.

5 also shows the positional relationship between the support 32C1 of the ophthalmic device 10C (the support 32C1 is shown with a dashed line), the subject's eye E, and the light-emitting unit 363. In a plan view from the direction of the rotation axis 30 of the illumination system 32 (32C), the light-emitting unit 363 is positioned outside the shading angle θ formed by two tangent lines L3 of the illumination system 32 (32C) when the illumination system 32 (32C) is positioned on the observation axis LA connecting the origin O, which is the position of the subject's eye E, to the objective lens 50, which is the light-receiving unit of the observation system 34. Therefore, when the tower-type illumination system 32C is positioned on the observation axis LA, the subject's eye E can be irradiated with the second illumination light L2 as background illumination from both of the light-emitting units 363 located at both ends of the illumination device 36A in the left-right direction Dx.

In the case of an ophthalmic apparatus in which a light-emitting unit for background illumination is installed above the observation system, if a tower-type illumination system (e.g., illumination system 32C) is used, depending on the rotation position of the illumination system, it is conceivable that the illumination light emitted from the light-emitting unit may be blocked by the illumination system, preventing the subject's eye E from being sufficiently illuminated. However, even when using a tower-type illumination system 32C, the ophthalmic apparatus 10C equipped with the illumination device 36A of this embodiment can avoid the blocking of background illumination light by the illumination system, suppress the occurrence of shadows on the eyelids of the subject's eye E, and irradiate the subject's eye E with second illumination light L2 as background illumination from one of the light-emitting units 363, enabling more accurate observation of the subject's eye.

(Embodiment 2)
Next, a second embodiment of the present disclosure will be described. An ophthalmic apparatus 10D of the second embodiment automatically controls dimming of the second illumination light emitted from a light source for background illumination. FIG. 9 is an enlarged view of the rotation shafts 26, 30 of the ophthalmic apparatus 10D, which include rotation shafts 26, 30 to which an optical encoder 61 (position detection unit) is attached, and the ophthalmic apparatus 10E, which includes rotation shafts 26, 30 to which a magnetic encoder 62 (position detection unit) is attached. In the description of the ophthalmic apparatus 10D, the same components as those of the ophthalmic apparatus 10A will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The ophthalmic device 10D has a configuration similar to that of the ophthalmic device 10A shown in FIG. 1 . The ophthalmic device 10D includes an optical encoder 61 on the rotation shafts 26 and 30. The optical encoder 61, for example, is a rotary encoder, and includes an optical sensor 611 and a slit disk 612. The slit disk 612 is arranged coaxially with the rotation shafts 26 and 30, has a flat plate shape, and has multiple slits (openings or notches) intermittently arranged around the outer periphery. The optical sensor 611 is a light-emitting/receiving sensor in which a light-emitting unit and a light-receiving unit are formed integrally or separately. The optical sensor 611 irradiates light at the arrangement position of the slit disk 612 and receives the reflected or transmitted light. The control device 40 (see FIG. 6) of the ophthalmic device 10D receives a light detection signal from the optical sensor 611 and can detect the rotation angle of the rotation shafts 26 and 30. Therefore, the control device 40 can detect the rotation angle of the illumination system 32 relative to the observation system 34 using the optical encoder 61.

Next, an example of an operational flowchart of the ophthalmologic apparatus 10 will be described with reference to FIG. 10. In the flowchart of FIG. 10, the processing or operations of steps S21, S22, S23, S24, S25, and S26 are similar to the processing or operations of steps S01, S02, S03, S04, S05, and S06, respectively. Furthermore, the processing of step S29 is similar to the processing of step S10.

In step S27, the ophthalmic device 10D turns on (or switches to "ON") the light source for background illumination in response to the user's operation of the light source operation unit 38. The ophthalmic device 10D also has a function of controlling the dimming of the light-emitting unit 363 depending on the relative positions of the illumination system 32 and the light-emitting unit 363. The dimming control includes switching the emission of the second illumination light L2 by the light-emitting unit 363 ON or OFF and adjusting the light intensity. As an example of dimming control, the control device 40 detects the relative position (rotation angle) of the illumination system 32 adjusted in step S23 with respect to the observation system 34 using the optical encoder 61. The control device 40 has a function of automatically selecting and turning on the light-emitting units 363, which are light sources for background illumination in the ophthalmic device 10A shown in FIG. 4, for example, so as to turn on one side that is not shaded by the illumination system 32 (the side that is not in the shadow of the illumination system 32) and turn off the other side that is shaded by the illumination system 32. The second illumination light L2 (see FIG. 1) is emitted from the turned-on light-emitting units 363.

The ophthalmic device 10D has correspondence information stored in advance in a storage device that corresponds the rotation angles of the illumination system 32 and the observation system 34 with light blocking information indicating the extent to which the second illumination light L2 emitted from each light-emitting unit 363 reaches the subject's eye E. Alternatively, the storage device stores a predetermined angle from among the rotation angles as threshold information for turning on or off the light-emitting unit 363. The control device 40 can control the light-emitting unit 363 to turn on when the entire light-emitting unit 363 is not blocked by the illumination system 32 when viewed from the subject's eye E, or when only a portion of the light-emitting unit 363 (e.g., 80% or half of the entire light-emitting unit 363) is not blocked by the illumination system 32 when viewed from the subject's eye E, as shown in the ophthalmic device 10A-1 in FIG. 4, for example.

Furthermore, whether the infrared light source 363a or the visible light source 363b of the light-emitting unit 363 is to be turned on may be set manually by a user's operation, or may be set automatically by the control device 40.

In step S28, the control device 40 dims the light-emitting unit 363 (light source) for background illumination that has been turned on. As described above, multiple light-emitting units 363 are provided in the movable direction of the illumination system 32 as viewed from the subject's eye E. The control device 40 has a dimming control function that dims the light-emitting unit 363 so as to suppress changes in the light intensity of the second illumination light L2 reaching the subject's eye E from the light-emitting unit 363 regardless of the position of the illumination system 32. Specifically, the control device 40 controls the output of the light-emitting unit 363 so that the light intensity is approximately the same when one light-emitting unit 363 that is not blocked by the illumination system 32 when emitting the second illumination light L2 (the right light-emitting unit 363 in FIG. 4) is turned on, as in the ophthalmic device 10A-2 of FIG. 4, and when both light-emitting units 363 that are not blocked by the illumination system 32 when emitting the second illumination light L2 are turned on, as in the ophthalmic device 10A-1. That is, the control device 40 reduces the output of the second illumination light L2 when many light-emitting elements 363 are turned on, and increases the output of the second illumination light L2 when few light-emitting elements 363 are turned on. In this way, the control device 40 controls the light intensity of the second illumination light L2 according to the number of light sources of the second illumination light L2 that can reach the subject's eye E, thereby suppressing changes in brightness around the observation area, etc., regardless of the position of the illumination system 32 when the examiner is observing or when imaging in step S29 is performed.

In this embodiment, too, when observing the subject's eye E, the illumination system 32 mainly irradiates the subject's eye E with the first illumination light L1 from a position offset (away from) the observation axis LA connecting the subject's eye E and the objective lens 50, which is the light-receiving unit of the observation system 34, from a direction tilted relative to the observation axis LA. Therefore, as shown in the ophthalmic device 10A-2 in Figure 4, if the illumination system 32 moves to the left (or right) of the observation axis LA and the second illumination light L2 emitted from some of the light-emitting units 363 is blocked, some of the light-emitting units 363 that cannot irradiate the subject's eye E with the second illumination light L2 are turned off. This makes it possible to reduce unnecessary power consumption by the ophthalmic device 10.

As described above, the ophthalmic device 10D of embodiment 2 is configured to control the light-emitting unit 363 so as to suppress changes in the light intensity of the second illumination light L2 reaching the subject's eye E from the light-emitting unit 363 regardless of the position of the illumination system 32. This makes it possible to more accurately observe the subject's eye E using background illumination with simple operations while suppressing the occurrence of shadows on the eyelids when observing the subject's eye E.

(Modification 1 of Embodiment 2)
The ophthalmic apparatus 10D may be an ophthalmic apparatus 10E equipped with a magnetic encoder 62 instead of the optical encoder 61. The magnetic encoder 62 includes, for example, a magnetic sensor 621 (e.g., a Hall element) fixed to the rotation shaft 30 and a magnetic drum 622, which is a permanent magnet annularly arranged around the rotation shaft 26, and outputs a detection signal corresponding to the rotation angle of the rotation shaft 30 relative to the rotation shaft 26. The control device 40 can determine the rotation angle (relative position) of the illumination system 32 with respect to the observation system 34 based on the detection signal acquired from the magnetic encoder 62. The ophthalmic apparatus 10E can operate according to the flowchart of FIG. 10 , similar to the ophthalmic apparatus 10D.

Furthermore, in addition to the optical encoder 61 and magnetic encoder 62, the ophthalmic device 10 may use other encoders, such as a mechanical encoder (potentiometer) or an electromagnetic induction encoder, as a device for detecting the angle of the illumination system 32 relative to the observation system 34.

(Modifications 2 and 3 of Embodiment 2)
Next, Modifications 2 and 3 of Embodiment 2 will be described. Fig. 11 is a front view illustrating an ophthalmic apparatus 10F (10) according to Modification 2 and an ophthalmic apparatus 10G (10) according to Modification 3 of Embodiment 2. In the description of the ophthalmic apparatus 10F and the ophthalmic apparatus 10G, the same components as those in the ophthalmic apparatus 10A will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The illumination device 36F of the ophthalmic apparatus 10F has a camera unit 63 located approximately in the center of the illumination main body 361 in the left-right direction Dx. In the ophthalmic apparatus 10G, the camera unit 63 captures an image of the illumination system 32, and the control device 40 can detect the position of the illumination system 32 from the acquired image. The illumination device 36G has correspondence information stored in advance in a storage device that corresponds the rotation angles of the illumination system 32 and the observation system 34 with light blocking information indicating the extent to which the second illumination light L2 emitted from each light-emitting unit 363 reaches the subject's eye E. Alternatively, the storage device stores a predetermined angle from among the rotation angles as threshold information for turning on or off the light-emitting unit 363.

The control device 40 of the ophthalmic device 10F can determine the rotation angle (relative position) of the illumination system 32 with respect to the observation system 34 based on image data acquired by the camera unit 63. Furthermore, the ophthalmic device 10F can operate according to the flowchart in Figure 10, similar to the ophthalmic device 10D.

The illumination device 36G of the ophthalmic apparatus 10G is equipped with a TOF (Time of Flight) sensor 64 located approximately in the center of the illumination main body 361 in the left-right direction Dx. The ophthalmic apparatus 10G can detect the presence or absence of the illumination system 32 using the TOF sensor 64. The illumination device 36G may also have correspondence information stored in advance in a storage device that corresponds the rotation angles of the illumination system 32 and the observation system 34 with shading information indicating the extent to which the second illumination light L2 emitted from each light-emitting unit 363 reaches the subject's eye E, or a predetermined angle from among the rotation angles may be stored as threshold information for turning on or off the light-emitting unit 363.

The control device 40 of the ophthalmic device 10G can determine the rotation angle (relative position) of the illumination system 32 with respect to the observation system 34 based on data regarding the position information of the illumination system 32 acquired from the TOF sensor 64. Furthermore, the ophthalmic device 10G can operate according to the flowchart in Figure 10, similar to the ophthalmic device 10D.

(Embodiment 3)
Next, a third embodiment will be described. Fig. 12 is a perspective view of the illumination system 32 and the observation system 34 of an ophthalmic apparatus 10H (10) of this embodiment, as viewed from the side of the subject's eye E. In the description of the ophthalmic apparatus 10H, the same components as those of the ophthalmic apparatus 10A will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The ophthalmic device 10H is equipped with an illumination device 36H instead of the illumination device 36A in the ophthalmic device 10A. Compared to the illumination device 36A, the illumination device 36H has a shorter left-right width for the illumination main body 361 and a narrower spacing for the arm portions 362. In the ophthalmic device 10H using slit light, when observing the subject's eye E, the illumination system 32 is mainly located off (away from) the observation axis LA connecting the subject's eye E and the objective lens 50, which is the light receiving unit of the observation system 34, and irradiates the subject's eye E with first illumination light L1 from a direction tilted with respect to the observation axis LA. Therefore, as shown in the front view of the vicinity of the observation axis LA in FIG. 12 , even if the light-emitting unit 363 is arranged in such a way that some (or all) of the light emitted from the light-emitting unit 363 is blocked when the illumination system 32 is positioned approximately on the observation axis LA, the illumination device 36H can detect the position of the illumination system 32 at which the second illumination light L2 is blocked by the illumination system 32, and perform dimming control of the light-emitting unit 363 according to the relative positions of the illumination system 32 and the light-emitting unit 363 to prevent the second illumination light L2 from being blocked during observation of the subject's eye E. Therefore, as in Embodiment 1 or 2, when observing the subject's eye E, shadows on the eyelids can be suppressed and the subject's eye E can be observed more accurately using background illumination. Furthermore, the ophthalmic apparatus 10H can be configured compactly overall because the illumination device 36H has a short width.

The ophthalmologic apparatus 10H can also perform the processing and operations of the flowchart in Figure 10. This allows for more accurate observation of the subject's eye E using background illumination with fewer steps while suppressing the occurrence of shadows on the eyelids when observing the subject's eye E, and also allows for the miniaturization of the area surrounding the illumination device 36H.

The ophthalmic apparatus 10H may also perform the processing and operations of the flowchart in Figure 7. This allows the illumination device 36H to be made smaller while suppressing the occurrence of shadows on the eyelids when observing the subject's eye E.

(Modification 1 of Embodiment 3)
Next, a first modification of the third embodiment will be described. Fig. 13 is a front view illustrating an ophthalmic apparatus 10I (10) according to the first modification of the third embodiment. The ophthalmic apparatus 10I includes an illumination device 36I instead of the illumination device 36A in the ophthalmic apparatus 10A. In the description of the ophthalmic apparatus 10I, the same components as those in the ophthalmic apparatus 10A will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The lighting device 36I of the ophthalmic device 10I includes multiple light-emitting units 363 arranged approximately in the center of the lighting main body 361 in the left-right direction Dx.

The rotation angle of the illumination system 32 in the ophthalmic device 10I can be determined by the control device 40 using any of the aforementioned encoders (e.g., optical encoder 61, magnetic encoder 62, etc.), camera unit 63, and TOF sensor 64. When observing the subject's eye E, the illumination system 32I is primarily positioned off (away from) the observation axis LA connecting the subject's eye E and the objective lens 50, which is the light receiving unit of the observation system 34, and irradiates the subject's eye E with first illumination light L1 from a direction tilted with respect to the observation axis LA. Therefore, even when the light-emitting units 363 of the illumination device 36I are arranged at intervals such that the second illumination light L2 emitted from the left and right light-emitting units 363 arranged in the center of the illumination main body 361 is partially or completely blocked, there is almost no effect on the accuracy of observation of the subject's eye E, and as with embodiment 1 or embodiment 2, when observing the subject's eye E, the occurrence of shadows on the eyelids can be suppressed and the subject's eye E can be observed more accurately using background illumination.

The ophthalmic device 10I can also perform the processing and operations of the flowchart in Figure 10. This allows for more accurate observation of the subject's eye E using background illumination with fewer steps while suppressing the occurrence of shadows on the eyelids when observing the subject's eye E, and also allows for the miniaturization of the area surrounding the illumination device 36I.

The ophthalmic device 10I may also perform the processing and operations of the flowchart in Figure 7. This allows the illumination device 36I to be made smaller while suppressing the occurrence of shadows on the eyelids when observing the subject's eye E.

(Embodiment 4)
Next, a fourth embodiment of the present disclosure will be described. FIGS. 14 and 15 are front views of an ophthalmic apparatus 10J (10J-1, 10J-2, 10J-3) according to the fourth embodiment. In the description of the ophthalmic apparatus 10J, components similar to those of the ophthalmic apparatus 10A will be denoted by the same reference numerals, and their description will be omitted or simplified. The ophthalmic apparatus 10J has the same configuration as the ophthalmic apparatus 10A, but includes an illumination device 36J instead of the illumination device 36A. The illumination device 36J includes a light-emitting unit 363J configured to be movable in the left-right direction Dx, which is the movable direction of the illumination system 32 as viewed from the subject's eye E. The light-emitting unit 363J is provided on the front side (the subject's eye E side) of the illumination main body 361. The light-emitting unit 363J can be configured to be movable in the left-right direction Dx, for example, by being disposed in a power transmission mechanism using a rack gear and a pinion gear, but any other power transmission mechanism can be used.

The device has an avoidance operation function that moves the light-emitting unit 363 according to the position of the illumination system 32 to prevent the second illumination light L2 emitted from the light-emitting unit 363 from being blocked by the illumination system 32. The avoidance operation function is performed under the control of the control device 40. Specifically, as shown in the ophthalmic device 10J-1, when the illumination system 32 is located approximately in the center of the ophthalmic device 10J in the left-right direction Dx, the control device 40 positions (moves) the light-emitting unit 363J to the right or left side (indicated by the dashed dotted line) of the illumination system 32.

Furthermore, as shown in the ophthalmic device 10J-2, when the illumination system 32 is located outside and away from the center in the left-right direction Dx of the ophthalmic device 10J (for example, one of the light-emitting units 363J in the illumination device 36J), the control device 40 can move the light-emitting unit 363J from its position on the right (or left) side in the left-right direction Dx of the ophthalmic device 10J-2 to the inside, thereby preventing the second illumination light L2 from being blocked by the illumination system 32. Note that the light-emitting unit 363J may be moved to the left when the illumination system 32 moves to the right as viewed from the subject's eye E, or may be moved to the right when the illumination system 32 moves to the left.

Furthermore, as shown in the ophthalmic device 10J-3, when the illumination system 32 is located outside and away from the center of the ophthalmic device 10J in the left-right direction Dx, the control device 40 may move the light-emitting unit 363J to an approximately central position in the left-right direction Dx of the ophthalmic device 10J-3 to prevent the second illumination light L2 from being blocked by the illumination system 32.

The ophthalmic device 10J according to embodiment 4 has a movable light-emitting unit 363J, which prevents shadows from forming on the eyelids and enables accurate observation of the subject's eye E while avoiding blocking of the second illumination light L2 as background illumination by the illumination system 32. Furthermore, the ophthalmic device 10J can provide an ophthalmic device 10J (slit lamp microscope) that prevents flare and enables accurate observation of the subject's eye E.

The ophthalmic device 10J may have multiple light-emitting units 363J on the left and right of the illumination main body 361 of the illumination device 36J. In this case, if the illumination system 32 is located outside and away from the center in the left-right direction Dx of the ophthalmic device 10J, all of the light-emitting units 363J may be moved to be located in the center as viewed from the examinee's eye E side, or both of the light-emitting units 363J may be controlled to move left when the illumination system 32 moves to the right as viewed from the examinee's eye E side, or both of the light-emitting units 363J may be controlled to move right when the illumination system 32 moves to the left.

Furthermore, although not shown, the control device 40 may move one or both of the light-emitting units 363J provided on the left and right sides of the illumination main body 361 in the same direction as the movement direction of the illumination system 32 to prevent the second illumination light L2 from being blocked by the illumination system 32. The control device 40 may move the light-emitting unit 363J to the right or left while positioning it on both the left and right sides of the illumination system 32 when viewed from the examinee's eye E side.

Furthermore, the configuration that allows the light-emitting unit 363J to be moved may be applied to the configurations of the other ophthalmic devices 10A to 10I.

Furthermore, although an example has been described in which the infrared light source 363a and visible light source 363b included in the light-emitting unit 363J are moved simultaneously, they may also be moved individually.

The above has described an ophthalmic device 10 and a light source control method for the ophthalmic device 10, which includes an illumination system 32 rotatably supported around the subject's eye E while directing the irradiation direction of the first illumination light L1 toward the subject's eye E, an observation system 34 provided on the opposite side of the illumination system 32 from the position of the subject's eye E, and a light-emitting unit 363 for background illumination provided in the observation system 34 below the subject's eye E, and in which the light-emitting unit 363 is dimmed depending on the relative positions of the illumination system 32 and the light-emitting unit 363. This makes it possible to provide an ophthalmic device 10 that enables more accurate observation of the subject's eye E using background illumination.

The present invention also describes a configuration in which the ophthalmic apparatus 10 includes an illumination system 32 that is rotatably supported around the subject's eye E while directing the irradiation direction of the first illumination light L1 toward the subject's eye E, and an observation system 34 that has a camera device 56 and is provided on the opposite side of the illumination system 32 from the position of the subject's eye E, and the camera device 56 includes an imaging unit 561 that receives and captures the first illumination light L1 reflected by the subject's eye E, and a light-emitting unit 363 for background illumination that is provided in the observation system 34 below the subject's eye E. This makes it possible to provide an ophthalmic apparatus 10 and camera device 56 that have a simple configuration and are capable of both background illumination and imaging for the subject's eye E.

The ophthalmic device 10 described above includes an illumination system 32 rotatably supported around the subject's eye E while directing the irradiation direction of the first illumination light L1 toward the subject's eye E, an observation system 34 provided on the opposite side of the illumination system 32 from the position of the subject's eye E, and a light-emitting unit 363 for background illumination provided in the observation system 34 below the subject's eye E, with multiple light-emitting units 363 provided in the direction in which the illumination system 32 can move as viewed from the subject's eye E. This makes it possible to configure an ophthalmic device 10 that can more accurately observe the subject's eye E while avoiding blocking of the second illumination light L2 for background illumination by the illumination system 32 and suppressing the occurrence of shadows on the eyelids.

The present invention also describes an ophthalmic device 10 that includes an illumination system 32 rotatably supported around the subject's eye E while directing the irradiation direction of the first illumination light L1 toward the subject's eye E, an observation system 34 that is provided on the opposite side of the illumination system 32 from the position of the subject's eye E, and a light-emitting unit 363 for background illumination that is provided in the observation system 34 below the subject's eye E, and that has an avoidance operation function that moves the light-emitting unit 363 according to the position of the illumination system 32 to prevent the second illumination light L2 emitted from the light-emitting unit 363 from being blocked by the illumination system 32. In this way, an ophthalmic device 10 and an illumination control method for the ophthalmic device 10 can be configured that prevent the second illumination light L2 of background illumination from being blocked by the illumination system 32, while suppressing the occurrence of shadows on the eyelids and enabling more accurate observation of the subject's eye E.

This concludes the description of the embodiments of the present disclosure, but the aspects of the present disclosure are not limited to the configurations shown in each embodiment.

10 (10A to 10J) Ophthalmic device 10A-1, 10A-2 Ophthalmic device 10J-1 to 10J-3 Ophthalmic device 12 Base 14 Face support section 14a Support column 14b Chin rest 14c Forehead rest 16 Electric drive section 18 Movable table 20 Operating lever 20a Switch 22 First support member 24 Microscope support arm 24a Horizontal arm section 24b Vertical arm section 26 Rotating shaft 28 Second support member 30 Rotating shaft 32 (32A, 32C) Illumination system 32C1 Support column 32I Illumination system 34 (34A, 34B) Observation system 36 (36A, 36B, 36F to 36J) Illumination device 38 Light source operation section 40 Control device 44 Slit lamp 46 Deflection optical system 46C Illumination optical system 48, 48C Deflection section 50 Objective lens 52, eyepiece 56, camera device 56a, inserted portion 61, optical encoder 62, magnetic encoder 63, camera unit 64, TOF sensor 361, illumination main body 362, arm 362a, insertion portions 363, 363J, light emitting unit 363a, infrared light source 363b, visible light source 381, slit lamp light source operation unit 382, infrared light source operation unit 383, visible light source operation unit 561, imaging unit 562, power supply circuit 563, control circuit 611, optical sensor 612, slit disc 621, magnetic sensor 622, magnetic drum Dx, left-right direction Dy, front-back direction Dz, up-down direction E, eye to be examined L1, first illumination light L2, second illumination light L3, tangent line LA, observation axis O, origin θ, shading angle

Claims (5)

an illumination system supported rotatably around the subject's eye while directing the irradiation direction of the first illumination light toward the subject's eye;
an observation system provided on the opposite side of the illumination system from the position where the eye to be examined is disposed;
a light-emitting unit for background illumination provided in the observation system at a position below the subject's eye;
Equipped with
an ophthalmic apparatus having an avoidance operation function that moves the light-emitting unit according to the position of the illumination system to avoid the second illumination light emitted from the light-emitting unit being blocked by the illumination system. a plurality of light-emitting units are provided in a movable direction of the illumination system as seen from the subject's eye side;
the avoidance operation function has a function of moving the light-emitting unit along an arrangement direction of the light-emitting unit,
The ophthalmic device according to claim 1 . The ophthalmic device of claim 2, wherein the avoidance operation function includes a function of moving all of the light-emitting units so that they are positioned in the center when viewed from the subject's eye. The ophthalmic device of claim 3, wherein the avoidance operation function has a function of moving one or both of the left and right light-emitting units in the same direction as the movement direction of the illumination system while positioning the light-emitting units on both the left and right sides of the illumination system when viewed from the examinee's eye. an ophthalmologic apparatus including: an illumination system that is rotatably supported around the subject's eye while directing an irradiation direction of first illumination light toward the subject's eye; an observation system that is provided on an opposite side of the illumination system from a position where the subject's eye is disposed; and a light-emitting unit for background illumination that is provided in the observation system at a position below the subject's eye,
An illumination control method that moves the light-emitting unit according to the position of the illumination system, thereby preventing the second illumination light emitted from the light-emitting unit from being blocked by the illumination system.