Control method of ophthalmologic device and ophthalmologic device

Abstract

To provide a control method of an ophthalmologic device simplifying operation of inserting and removing a front lens, and the ophthalmologic device.SOLUTION: A control method of an ophthalmologic device includes: a first moving step of moving a head part in a direction away from a subject's eye when detecting a sign of movement of a front lens from a retracted position to a use position; a second moving step of moving the head part in a direction of approaching the subject's eye after the front lens has been moved to the use position; and a third moving step of moving the head part in a direction away from the lens when detecting a sign of the movement of the front lens from the use position to the retreat position.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a control method for an ophthalmic apparatus and an ophthalmic apparatus. [Background technology]

[0002] In ophthalmic surgery, an ophthalmic device (ophthalmic microscope) equipped with a microscope supported by a support mechanism such as a robot arm is used. In such an ophthalmic device, an examiner inserts and removes a front lens between an objective lens and an eye to be examined, depending on the site to be operated (for example, an anterior segment or a fundus segment). When the front lens is inserted and removed between the objective lens and the eye to be examined, the focal length changes, and it becomes necessary to adjust the distance between the microscope (objective lens) and the eye to be examined. As a technique for eliminating the above adjustment, for example, an ophthalmic device equipped with an objective auxiliary lens that can be inserted and removed in the optical path of the objective lens (observation optical system) is disclosed (Patent Document 1). In this ophthalmic device, when observing the anterior segment of the eye, the objective auxiliary lens is set and the front lens is released, and when observing the posterior segment of the eye, the front lens is set and the objective auxiliary lens is released, thereby making it unnecessary to change the positional relationship between the objective lens and the eye to be examined. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-42478 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the actual observation of the subject's eye, when inserting or removing the front lens, the examiner may perform a retraction operation to move the microscope away from the subject's eye in advance to avoid collision with a part of the subject's face. In this case, after completing the insertion or removal of the front lens, the examiner moves the microscope again in the direction approaching the subject's eye to adjust it to a position suitable for observation. Therefore, even if the position adjustment of the microscope for focus adjustment accompanying the insertion or removal of the front lens is no longer necessary as in the ophthalmic device of Patent Document 1, it is expected that the examiner's operation of moving the microscope position will still be performed. In addition, since the above-mentioned auxiliary objective lens is configured to correspond to a certain front lens, even when an auxiliary objective lens is used, the examiner's operation is required when using multiple front lenses, etc.

[0005] An object of the present disclosure is to provide an ophthalmic apparatus and a control method for the ophthalmic apparatus that simplify the operations involved in inserting and removing a front lens. [Means for solving the problem]

[0006] The control method for an ophthalmic device disclosed herein is a control method for an ophthalmic device having a microscope supported by a support mechanism and a front lens provided in a head portion of the microscope, and includes a first movement step of moving the head portion in a direction away from the test eye when an indication of movement of the front lens from a retracted position to a use position is detected, a second movement step of moving the head portion in a direction approaching the test eye when movement of the front lens to the use position is completed, and a third movement step of moving the head portion in the moving away direction when an indication of movement of the front lens from the use position to the retracted position is detected.

[0007] The ophthalmic device of the present disclosure comprises a microscope supported by a support mechanism, a front lens provided in a head portion of the microscope, and a control unit, wherein the control unit moves the head portion away from the test eye when it detects signs of the front lens moving from a retracted position to a usage position, moves the head portion in a direction approaching the test eye when it determines that the movement of the front lens to the usage position is completed, and moves the head portion in the away direction when it detects signs of the front lens moving from the usage position to the retracted position. Effect of the Invention

[0008] The control method for an ophthalmic apparatus and the ophthalmic apparatus according to the present disclosure using the above-mentioned means can simplify the operations involved in inserting and removing a front lens. [Brief description of the drawings]

[0009] [Figure 1] 1 is an overall view of an ophthalmic apparatus. [Diagram 2] FIG. 2 is a diagram illustrating an internal configuration of an optical system of an ophthalmic apparatus. [Diagram 3] FIG. 1 is a block diagram of an ophthalmic apparatus. [Figure 4] 4 is a flowchart of control of the ophthalmic apparatus. [Diagram 5] FIG. 4 is a diagram showing the movement of a head portion. [Figure 6] FIG. 4 is a diagram showing the movement of a head portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is an overall view of an ophthalmic device 1. The ophthalmic device 1 of this embodiment is an ophthalmic microscope device. The ophthalmic device 1 includes legs 3, a support column 4, a robot arm 5 (a first arm 51, a second arm 52, a third arm 53, a connection portion 54, and a fourth arm 55) that serves as a support mechanism, and a microscope 6 supported by the robot arm 5.

[0011] The leg 3 has casters and can be moved to any position. The support 4 is supported in a substantially vertical direction by the leg 3. The first arm 51 is connected to the support 4 so as to be rotatable around an axis. The second arm 52 is connected to the first arm 51, the third arm 53 is connected to the second arm 52, the connection portion 54 is connected to the third arm 53, and the fourth arm 55 is connected to the connection portion 54 so as to be rotatable. Although shown diagrammatically in FIG. 1, the rotation axes provided at two locations on both ends of the second arm 52 and the third arm 53 are arranged in a direction substantially perpendicular to the axial direction of the arms. The rotation axis between the support 4 and the first arm 51 is arranged on the axis of the first arm 51, and the rotation axis between the connection portion 54 and the fourth arm 55 is arranged on the axis of the fourth arm 55. The ophthalmic device 1 can control the horizontal position and the height position of the microscope 6 by driving the robot arm 5. The ophthalmologic apparatus 1 can control the overall position of the microscope 6 by means of the legs 3, the support 4, and the robot arm 5 (a first arm 51, a second arm 52, a third arm 53, a connection part 54, and a fourth arm 55).

[0012] The microscope 6 has a support unit 61, a support arm 62, a head unit 63, and a display unit 64. The support unit 61 is provided between the fourth arm 55 and the head unit 63, and supports the head unit 63 via the support arm 62. The support arm 62 is connected to the support unit 61 so as to be relatively movable, and supports the head unit 63 on the side opposite to the support unit 61.

[0013] The head unit 63 has an observation camera 631, a lens barrel unit 632, an internal optical system 100, and a position adjustment mechanism 633. The observation camera 631 has a function of imaging the subject's eye E in the microscope 6.

[0014] The objective lens 2 of the internal optical system 100 is assembled at the bottom of the lens barrel portion 632. The internal optical system 100 will be described later.

[0015] The display unit 64 is a monitor that displays an image obtained by the observation optical system 400 described later in FIG. 2. The display unit 64 in this embodiment is a stationary device independent of the head unit 63. The display unit 64 may display information on the subject's eye E or observation conditions, etc., superimposed on the observation image. In this embodiment, since a monitor is used as the display unit 64, the observation image of the subject's eye E is adjusted to data suitable for display on the display unit 64 by the control unit 110 performing image processing (inversion processing). Note that the ophthalmic apparatus 1 may be configured to include a display unit (monitor) in the head unit 63, allowing the examiner to observe the subject's eye E through this display unit.

[0016] A position adjustment mechanism 633 for the front lens 18 is attached to the lens barrel 632. The position adjustment mechanism 633 has a holding arm 17 extending toward the subject's eye E and a front lens 18 attached to the tip of the holding arm 17. The holding arm 17 has a form in which a plurality of rod-shaped arms are connected at different angles. The front lens 18 is attached to the objective lens 2 side of the microscope 6. The front lens 18 is operated to move to a retracted position and a use position by the examiner rotating an operation unit 171 (see FIG. 1), which is, for example (see also the retracted position P1 and the use position P2 in FIG. 5 and FIG. 6). The holding arm 17 of this embodiment is formed so that the optical axis of the front lens 18 and the axis on the base end side of the holding arm 17 are parallel to each other. The position adjustment mechanism 633 can move the holding arm 17 in the vertical direction relative to the lens barrel 632. The position adjustment mechanism 633 can appropriately change the distance between the head lens 18 and the subject's eye E by moving the holding arm 17 in the vertical direction. In addition, the examiner has the function of inserting and removing the head lens 18 with respect to the optical axis of the objective lens 2 by operating an operation unit 171 that is a part of the position adjustment mechanism 633. The position adjustment mechanism 633 can move the head lens 18 by folding the holding arm 17 by a hinge provided in a part of the holding arm 17. The position of the microscope 6 can be controlled by operating a foot switch 19 (input unit) installed at the examiner's feet.

[0017] The foot switch 19 mainly has a plurality of switches, including an illumination switch and a position adjustment switch. The illumination switches include, for example, an illumination light amount adjustment switch, a movable illumination aperture switch, an illumination on / off switch, an illumination angle changeover switch, etc. The position adjustment switches include, for example, an up / down coarse movement switch, a front lens fine movement switch, an XY fine movement lever switch, a focus up / down switch, a magnification adjustment switch, a position initialization switch, etc. The foot switch 19 of this embodiment is mainly composed of a push button switch or a lever switch. Therefore, even when the examiner observes the subject's eye E while working with both hands, the examiner can easily operate the robot arm 5.

[0018] FIG. 2 is an internal configuration diagram that shows a schematic representation of the internal optical system 100 of the ophthalmic device 1. The optical system of the ophthalmic device 1 includes an objective lens 2 and an observation optical system 400. The objective lens 2 and the observation optical system 400 are housed in a microscope 6. Although not shown in FIG. 2, the internal optical system 100 may include an illumination optical system that irradiates light coaxially or non-coaxially (off-axis) with respect to the optical axis O-400 of the observation optical system 400. Alternatively, the internal optical system 100 may include an illumination optical system that irradiates light coaxially and non-coaxially (off-axis) with respect to the optical axis O-400 simultaneously or switchably. When the internal optical system 100 includes an illumination optical system, the internal optical system 100 may include one or more illumination light sources. The objective lens 2 is a circular biconvex lens.

[0019] The illumination light (or a part of the illumination light) irradiated to the subject's eye E is reflected and scattered by tissues of the subject's eye E, such as the cornea and the retina. The reflected and scattered return light (also called "observation light") passes through the objective lens 2 and enters the observation optical system 400.

[0020] The observation optical system 400 includes a variable magnification lens system 401, a relay lens unit 402, and an observation camera 631. In Fig. 2, an optical axis O-400 of the observation optical system 400 is indicated by a two-dot chain line. The observation optical system 400 is used to observe the subject's eye E through an objective lens 2. The observation light guided by the variable magnification lens system 401 and the relay lens unit 402 is imaged by an image sensor 631a of the observation camera 631.

[0021] When observing the retina at the fundus of the subject's eye E, the examiner operates the position adjustment mechanism 633 (specifically, the operation unit 171) to insert the front lens 18 onto the optical axis O-400 in front of the subject's eye E. In this case, the front focal position U0 of the objective lens 2 is conjugate with the retina at the fundus. On the other hand, when observing the anterior part of the eye such as the cornea and iris, the front lens 18 is detached from in front of the subject's eye E and observation is performed.

[0022] 3 is a block diagram showing the configuration of the ophthalmic apparatus 1 according to this embodiment. The ophthalmic apparatus 1 includes a control unit 110, a foot switch 19, a display unit 64, and a storage unit 120. The ophthalmic apparatus 1 may include an input device other than the foot switch 19 as an input unit. For example, the input unit of the ophthalmic apparatus 1 may be a touch panel or a physical switch that can be operated by the examiner (surgeon or assistant, etc.) by hand.

[0023] Each component of the control unit 110 is a functional component realized by cooperation of software and hardware. The control unit 110 may be an information processing device independent of the ophthalmic apparatus 1, or may be mounted in a CCU (camera control unit) of the ophthalmic apparatus 1. The control unit 110 may be communicably connected to the ophthalmic apparatus 1 via a network.

[0024] Furthermore, the control unit 110 executes functions and / or methods realized by codes or instructions included in the program 122 stored in the storage unit 120. For example, the control unit 110 may be a central processing unit (CPU), a micro-processing unit (MPU), a GPU, a microcontroller unit (MCU), a processor core, a multiprocessor, an ASIC, an FPGA, or the like, and each process disclosed in each embodiment may be realized by a logic circuit or a dedicated circuit formed in an integrated circuit, or the like. Furthermore, these circuits may be realized by one or more integrated circuits, and multiple processes shown in each embodiment may be realized by one integrated circuit.

[0025] The storage unit 120 has a function of storing various programs and various data required, such as a control program for the ophthalmologic apparatus 1. It is also capable of storing acquired information, such as measured signals. The storage unit 120 is realized by various storage media, such as an HDD, an SSD, or a flash memory.

[0026] The storage unit 120 stores position information 121 and various programs 122. The position information 121 in this embodiment is the height position of the microscope 6 with respect to the subject's eye E when the ophthalmic apparatus 1 observes the fundus. The position information 121 is information representing a spatial position expressed in, for example, a Cartesian coordinate system, a polar coordinate system, or other expression format.

[0027] Next, each step of the control method of the ophthalmic apparatus 1 will be described. FIG. 4 is a flow chart of the control of the ophthalmic apparatus 1. The operation of each step in FIG. 4 is controlled by the control unit 110. In this embodiment, a scene in which an examiner (surgeon) uses the ophthalmic apparatus 1 during cataract surgery and vitreous surgery will be described. First, the examiner performs surgery on the anterior part of the subject's eye E while observing the subject's eye E with the ophthalmic apparatus 1. At this time, the front lens 18 is retracted to a retracted position P1 as shown in state Q1 of FIG. 5. After completing the surgery on the anterior part, the examiner moves the front lens 18 from the retracted position to a use position in order to perform surgery on the fundus. Here, the ophthalmic apparatus 1 operates according to steps S01 to S03.

[0028] In step S01, when the control unit 110 detects a sign of the movement of the front lens 18 from the retracted position P1 to the use position P2, it executes a first movement step of moving the head unit 63 in the direction away from the subject's eye E (upward in this embodiment). The position of the microscope 6 after the movement is shown in state Q2 in FIG. 5. The detection of the sign is performed, for example, by the control unit 110 detecting the presence or absence of an input from a sensor such as an optical sensor, a physical switch (such as a microswitch), an electrostatic sensor, a sound collection sensor (microphone), or an observation camera 631 or a recording camera provided in the ophthalmic apparatus 1. When the control unit 110 detects a voice input collected from a sound collection sensor, the control unit 110 may determine the content of the instruction for the operation by voice recognition.

[0029] As an example of the configuration, the ophthalmic device 1 includes a proximity sensor that detects contact by the examiner on the operation unit 171 of the front lens 18. In this case, when the control unit 110 detects contact by the examiner on the operation unit 171 of the front lens 18 by the proximity sensor provided on the operation unit 171, it determines that movement from the retracted position P1 to the use position P2 is predicted, and can move the head unit 63 in the separating direction D1. The amount of movement in the separating direction D1 is set to, for example, 10 mm. Alternatively, the ophthalmic device 1 may include a sensor that detects the position or movement of the front lens 18. The sensor may be provided at a position where the position or movement of the front lens 18 can be directly detected, or may be provided at a position where the position or movement of the holding arm 17 can be detected. In this case, when the control unit 110 detects movement of the front lens 18 from the retracted position P1, it can move the head unit 63 in the separating direction D1.

[0030] In step S02, when the control unit 110 determines that the movement of the head lens 18 to the use position P2 is completed (see state Q3 in FIG. 6), it executes a second movement step of moving the head unit 63 in the approach direction D2 of the subject's eye E. The position of the microscope 6 after the movement is shown in state Q4 in FIG. 6. The amount of movement in the approach direction D2 is set to, for example, 10 mm. The ophthalmic apparatus 1 also includes a sensor (for example, an optical sensor, a physical switch, an electrostatic sensor, an observation camera 631, etc.) that detects the use position P2 of the holding arm 17 or the head lens 18. In this case, the control unit 110 determines that the movement of the head lens 18 to the use position P2 is completed by detecting an input to the sensor that the holding arm 17 or the head lens 18 has moved to the use position P2, and moves the head unit 63 in the approach direction D2 of the subject's eye E.

[0031] Also, the control unit 110 may be configured to move the head unit 63 when a predetermined time (e.g., 2 seconds, 3 seconds) has elapsed since detecting the completion of the movement of the front lens 18 to the usage position P2 in step S02.

[0032] In addition, the control unit 110 may be configured to move the head unit 63 in the approach direction D2 in step S02 so that the distance between the front lens 18 and the subject's eye E becomes a predetermined distance depending on the type of the front lens 18. The predetermined distance is stored in the storage unit 120 as position information 121, and is a distance at which the microscope 6 focuses on a desired observation site (for example, the fundus after the front lens 18 is inserted). The focusing distance (also called working distance) of the microscope 6 differs depending on the presence or absence of the front lens 18 as well as the type of the front lens 18. Therefore, when moving the front lens in the approach direction D2, the control unit 110 can set the distance between the front lens 18 and the subject's eye E so that the microscope 6 focuses on the fundus regardless of the type of the front lens 18.

[0033] The type of the front lens 18 is detected by the control unit 110 detecting the shape of the metal frame of the front lens 18 (for example, by a camera) according to an input by the examiner, or based on the recognition by the control unit 110 of a mark (printed, pasted, engraved, etc.) formed on the front lens 18. The front lens 18 is fixed (locked) by rotating the front lens 18 90 degrees according to an operation by the user. The control unit 110 may provide the metal frame of the front lens 18 with a unique shape that differs for each front lens 18, so that the control unit 110 can detect the type of the front lens 18 when the user fixes the front lens 18. As a method for detecting the type of the front lens 18, the control unit 110 may detect the capacitance unique to the front lens 18 by an electrostatic sensor, or detect light (for example, light intensity or wavelength) irradiated and reflected by the microscope 6 to determine the type of the front lens 18. The type of the front lens 18 currently attached to the ophthalmic apparatus 1 may be stored in advance in the storage unit 120 by the control unit 110, and may be acquired from the storage unit 120 in step S02.

[0034] When the examiner finishes the surgery and observation of the fundus, the ophthalmic apparatus 1 executes the process of step S03. In step S03, when the control unit 110 detects a sign of the movement of the front lens 18 from the use position P2 to the retracted position P1, the control unit 110 executes a third movement step of moving the head unit 63 in the separating direction D1. The position of the microscope 6 after the movement is shown in state Q3 in FIG. 6. The detection of the sign is performed, for example, by the control unit 110 detecting the presence or absence of an input from a sensor such as an optical sensor, a physical switch, an electrostatic sensor, a sound collection sensor, or an observation camera 631 provided in the ophthalmic apparatus 1. When the control unit 110 detects a voice input collected from a sound collection sensor, the control unit 110 may determine the content of the instruction for the operation by voice recognition.

[0035] For example, the control unit 110 detects an indication of the movement of the front lens 18 from the use position P2 to the retracted position P1 by detecting an input from the foot switch 19 or a sound collecting unit (not shown).

[0036] Alternatively, the detection of the sign of the movement of the head lens 18 from the use position P2 to the retracted position P1 may be performed by the control unit 110 detecting the lighting of the room (i.e., the operating room). The sign of the movement of the head lens 18 from the use position P2 to the retracted position P1 may be any input that is a sign that the head lens 18 is expected to move, or may be a direct input in which the examiner touches the operation unit 171 to start the movement of the head lens 18. The amount of movement in the separating direction D1 in step S03 may be the same as in step S01, and is set to, for example, 10 mm.

[0037] With the microscope 6 separated from the subject (state Q3), the front lens 18 is moved from the use position P2 to the retracted position P1 by the examiner's operation or the like (state Q2 in FIG. 5). This causes the microscope 6 to be retracted from the subject.

[0038] After step S03, when the control unit 110 detects that the front lens 18 has moved from the use position P2 to the retracted position P1, it may move the head unit 63 in the approach direction D2 (e.g., lower it by 10 mm) (state Q1).

[0039] In the above, in this embodiment, an ophthalmic device 1 including the microscope 6 supported by a support mechanism and the front lens 18 provided on the head unit 63 of the microscope 6, and a control method for the ophthalmic device 1 have been described. The control method for the ophthalmic device 1 includes a first movement step (S01) of moving the head unit 63 in a direction D1 away from the subject's eye E when a sign of movement of the front lens 18 from the retracted position P1 to the use position P2 is detected, a second movement step (S02) of moving the head unit 63 in a direction D2 approaching the subject's eye E when the movement of the front lens 18 to the use position P2 is completed, and a third movement step (S03) of moving the head unit 63 in the direction D1 away when a sign of movement of the front lens 18 from the use position P2 to the retracted position P1 is detected.

[0040] This allows the examiner to automatically move the microscope 6 closer or farther from the subject when inserting or removing the front lens 18 into or from the observation optical system of the microscope 6, thereby reducing the number of operations required for the ophthalmic apparatus 1. Therefore, the operations required for inserting and removing the front lens 18 can be simplified.

[0041] Furthermore, even when a conventional objective auxiliary lens (e.g., a concave lens) is used, the focal length cannot be kept constant when a front lens with a different lens power is inserted, making it difficult to omit the examiner's operation of adjusting the focus of the microscope 6, but the ophthalmic apparatus 1 of this embodiment can detect the type of the front lens 18 and set in advance an appropriate positional relationship from the objective lens 2 to the subject's eye E, so that the examiner's operation of adjusting the focus of the microscope 6 can be omitted or almost omitted. In other words, the ophthalmic apparatus 1 of this embodiment does not require the above-mentioned objective auxiliary lens, and the configuration of the optical system can be simplified.

[0042] Although the description of the embodiment of the present disclosure is completed above, the aspect of the present disclosure is not limited to this embodiment. For example, in the present embodiment, the configuration in which the entire microscope 6 (head unit 63) is moved up and down in the processing of steps S01 to S03 has been described, but the configuration may be such that the front lens 18, which is a part of the microscope 6, or a part of the optical system including the front lens 18 is moved up and down.

[0043] Furthermore, the ophthalmologic apparatus 1 may have an autofocus function (focus determination function) and may be configured so that the control unit 110 automatically sets the height of the microscope 6 and moves it.

[0044] In addition, in the present embodiment, the configuration in which the examiner observes the subject's eye E through the display unit 64 has been described, but the microscope 6 may be equipped with an eyepiece unit, and the observation light of the observation optical system 400 may be visually recognized. In this case, the ophthalmic device 1 may be equipped with an inverter that inverts the observation image of the subject's eye E. In addition, the ophthalmic device 1 having the eyepiece unit may be configured to have an electric drive mechanism in the Z-axis direction at the end of the support arm 62, and to drive the head unit 63 up and down in accordance with the movement of the front lens 18. Even with such a configuration, the examiner (surgeon) does not usually observe the surgical site when the head unit 63 is moved in response to the insertion and removal of the front lens 18, so that the operation associated with the insertion and removal of the front lens 18 can be simplified without impeding the existing feeling of use in observation.

[0045] Furthermore, the ophthalmologic apparatus 1 may be configured so that the head unit 63 is provided with a display unit (monitor) so that the examiner can observe the subject's eye E through this display unit.

[0046] The configuration of the present disclosure is exemplified as follows. [1] A method for controlling an ophthalmic apparatus including a microscope supported by a support mechanism and a front lens provided in a head portion of the microscope, comprising the steps of: a first moving step of moving the head unit in a direction away from the subject's eye when a sign of movement of the head lens from a retracted position to a use position is detected; a second moving step of moving the head unit in a direction approaching the subject's eye when the movement of the head lens to the use position is completed; a third moving step of moving the head unit in the separation direction when a sign of movement of the head lens from the use position to the retracted position is detected; A control method comprising: [2] The control method described in [1], wherein, in the first movement process, when contact by an examiner with an operating portion of the head lens is detected, or when movement of the head lens from a retracted position is detected, the head portion moves in the separating direction. [3] The control method according to [1], wherein in the second moving step, the head unit moves when a predetermined time has elapsed since completion of the movement is detected. [4] The control method described in [1], wherein in the second movement process, the head unit moves in the approach direction so that the distance between the head lens and the test eye becomes a predetermined distance depending on the type of the head lens. [5] The type of the front lens is detected based on input by an examiner, the shape of the metal frame of the front lens, recognition of a mark formed on the front lens, detection of capacitance, or detection of light irradiated and reflected by the microscope. [6] The control method according to [1], in the third movement process, detecting a sign of movement from the use position to the evacuation position is detecting an input from a foot switch or a sound sensor, or detecting the turning on of a light in the room. [7] In the second moving step, when a predetermined time has elapsed since the completion of the movement is detected, the head unit moves in the approaching direction so that a distance between the head lens and the subject's eye becomes a predetermined distance depending on a type of the head lens, The type of the front lens is detected based on an input by an examiner, a shape of a metal frame of the front lens, recognition of a mark formed on the front lens, detection of electrostatic capacitance, or detection of light irradiated and reflected by the microscope, In the third movement step, the sign of movement from the use position to the retreat position is detection of an input from a foot switch or a sound sensor, or detection of lighting in a room being turned on. The control method described in [2]. [8] a microscope supported by a support mechanism; a front lens provided in a head portion of the microscope; A control unit; Equipped with The control unit is When a sign of movement of the front lens from the retracted position to the use position is detected, the head unit is moved in a direction away from the subject's eye, When it is determined that the movement of the head lens to the use position is completed, the head unit is moved in a direction approaching the subject's eye, when detecting a sign of the front lens moving from the use position to the retracted position, the head unit is moved in the separating direction. Ophthalmology equipment. [Explanation of symbols]

[0047] 1 Ophthalmology equipment 2 Objective Lenses 3 legs 4 pillars 5. Robot Arm 6. Microscope 17 Holding Arm 18 Front lens 19 Foot Switch 51 First Arm 52 Second Arm 53 Third Arm 54 Connection 55 Fourth Arm 61 XY fine movement device 62 Support Arm 63 Head 64 Display section 100 Internal optics 110 Control section 120 Storage section 121 Location information 122 Programs 171 Operation section 400 Observation Optical System 401 Variable Magnification Lens System 402 Relay lens unit 631 Observation Camera 631a Image sensor 632 Tube 633 Position adjustment mechanism D1 Separation direction D2 Approach direction E Eye to be examined O-400 Optical axis P1 Retracted position P2 Use position Q1~Q4 States U0 Front focal position

Claims

1. A method for controlling an ophthalmic apparatus including a microscope supported by a support mechanism and a front lens provided in a head portion of the microscope, comprising the steps of: a first moving step of moving the head unit in a direction away from the subject's eye when a sign of movement of the head lens from a retracted position to a use position is detected; a second moving step of moving the head unit in a direction approaching the subject's eye when the movement of the head lens to the use position is completed; a third moving step of moving the head unit in the separation direction when a sign of movement of the head lens from the use position to the retracted position is detected; A control method comprising:

2. The control method according to claim 1, wherein in the first movement process, when contact of the examiner with the operating portion of the head lens is detected, or when movement of the head lens from a retracted position is detected, the head portion moves in the separating direction.

3. The control method according to claim 1 , wherein in the second moving step, the head unit moves when a predetermined time has elapsed since completion of the movement is detected.

4. The control method according to claim 1 , wherein in the second movement step, the head portion moves in the approach direction so that a distance between the head lens and the test eye becomes a predetermined distance depending on a type of the head lens.

5. The control method according to claim 1, wherein the type of the front lens is detected based on input by an examiner, recognition of the shape of the gold frame of the front lens, recognition of a mark formed on the front lens, detection of capacitance, or detection of light irradiated and reflected by the microscope.

6. The control method according to claim 1 , wherein in the third movement step, the detection of the sign of movement from the use position to the retreat position is detection of an input from a foot switch or a sound sensor, or detection of turning on a light in a room.

7. In the second moving step, when a predetermined time has elapsed since the completion of the movement is detected, the head unit moves in the approaching direction so that a distance between the head lens and the subject's eye becomes a predetermined distance depending on a type of the head lens, The type of the front lens is detected based on an input by an examiner, a shape of a metal frame of the front lens, recognition of a mark formed on the front lens, detection of electrostatic capacitance, or detection of light irradiated and reflected by the microscope, In the third movement step, the sign of movement from the use position to the retreat position is detection of an input from a foot switch or a sound sensor, or detection of lighting in a room being turned on. The control method according to claim 2 .

8. a microscope supported by a support mechanism; a front lens provided in a head portion of the microscope; A control unit; Equipped with The control unit is When a sign of movement of the front lens from the retracted position to the use position is detected, the head unit is moved in a direction away from the subject's eye, When it is determined that the movement of the head lens to the use position is completed, the head unit is moved in a direction approaching the subject's eye, when detecting a sign of the front lens moving from the use position to the retracted position, the head unit is moved in the separating direction. Ophthalmology equipment.

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