Fundus imaging device

Abstract

To make the movable position of the fixation target on the fundus imaging device easier to understand. [Solution] A fundus imaging device comprising: a fixation optical system that presents a fixation target to the eye under examination and can move the fixation target to a plurality of predetermined presentation positions; an observation optical system for acquiring an observation image of the fundus of the eye under examination using a frontal image; a display unit; an operation unit for receiving operation input; and a control unit, wherein the control unit displays an observation image of the fundus and superimposes fixation target marks, which are GUI widgets for receiving selection operations of presentation positions, on each of the plurality of positions corresponding to the plurality of presentation positions in the observation image.

Description

Technical Field

[0001] The present disclosure relates to a fundus imaging device.

Background Art

[0002] Conventionally, for imaging a desired portion of the fundus of an eye to be examined, there has been a fundus imaging device provided with a fixation target in which a plurality of LEDs are arranged in a matrix and which serves to guide the line-of-sight direction of the eye to be examined. Further, in this type of fundus imaging device, there is known one in which the presentation position of one fixation target is synthetically displayed on a fundus observation image (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the fundus imaging device described in Patent Document 1, when the presentation position of the fixation target is synthetically displayed on the fundus observation image when guiding the line-of-sight direction of the eye to be examined, only the current position of the fixation target is displayed. Therefore, it has been difficult for the examiner to know the movable positions of the fixation target.

[0005] An object of the present disclosure is to provide a fundus imaging device in which the movable positions of a fixation target are easily understandable.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention is characterized by having the following configuration.

[0007] The fundus imaging device comprises a fixation optical system that presents a fixation target to the eye under examination and can move the fixation target to a plurality of predetermined presentation positions; an observation optical system for acquiring an observation image of the fundus of the eye under examination using a frontal image; a display unit; an operation unit for receiving operation input; and a control unit, wherein the control unit displays the observation image of the fundus and superimposes fixation target marks, which are GUI widgets for receiving selection operations of the presentation positions, on each of the plurality of positions corresponding to the plurality of presentation positions in the observation image. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows a schematic configuration of the fundus imaging device used in the embodiment. [Figure 2] This figure shows an overview of the optical system of the apparatus in the embodiment. [Figure 3] This figure shows a schematic configuration of the fixation optical system in the embodiment. [Figure 4A] This figure shows a schematic configuration of a fixation target display unit in which numerous fixation lights are arranged adjacently in a vertical and horizontal direction in the embodiment. [Figure 4B] This diagram shows a schematic configuration of a fixation target display unit in which multiple fixation lights are arranged spaced apart from each other. [Figure 5] This is a diagram showing the screen display in fundus camera mode in the embodiment. [Figure 6] This diagram shows the screen display illustrating the movement of the current position button in the fundus camera mode of the embodiment. [Figure 7] This diagram shows the screen display after moving the current position button in the fundus camera mode of the embodiment. [Figure 8] This is a diagram showing the screen display of the macular imaging mode in the embodiment. [Modes for carrying out the invention]

[0009] Embodiments relating to this disclosure will now be described. Each embodiment may be applied to some or all of the other embodiments.

[0010] The fundus imaging device according to this embodiment acquires fundus images of the eye under examination. The fundus imaging device (for example, ophthalmic device 1) comprises a fixation optical system, an observation optical system, a display unit, an operation unit, and a control unit. The ophthalmic device according to this embodiment may be an optical coherence tomography (OCT), a fundus camera, a scanning laser ophthalmoscope (SLO), etc., which present a fixation target to the eye under examination.

[0011] A fixation optical system (e.g., fixation optical system 30) presents a fixation target to the eye under examination. The fixation optical system includes at least an internal fixation target. The fixation optical system presenting the internal fixation target shares a portion of the optical path with the imaging optical system. The fixation optical system includes at least a light source for forming the fixation target. The fixation position by the fixation target may be changeable. The fixation optical system may have either a projector or a display for forming the fixation target.

[0012] The observation optical system (for example, observation optical system 40) acquires an observation image of the eye under examination using a frontal view of the fundus. An observation image is an image of the eye under examination observed from a predetermined direction. The observation image may be acquired before or after imaging the eye under examination. The observation image is acquired, for example, for the examiner to use to adjust various imaging conditions such as focus and alignment. The observation image may also be acquired using infrared light.

[0013] The display unit (for example, display unit 12) displays an observation image of the fundus of the eye being examined, specifically a frontal image. For example, the display unit may also display UI elements (GUI widgets) of a graphical user interface (GUI). The operation unit (for example, operation unit 13) receives operation input from the examiner (to the GUI widgets). The operation unit and the display unit may be integrated as a touch panel display.

[0014] The control unit (for example, control unit 10) causes the display unit to display an observation image based on a frontal observation image of the subject eye. The control unit also detects an operation input from the operation unit. Further, the control unit superimposes and displays a fixation mark for receiving a selection operation of a presentation position at each of a plurality of positions corresponding to a plurality of predetermined presentation positions in the frontal observation image of the subject eye.

[0015] The control unit causes the display unit to display an observation image of the fundus, and superimposes and displays a fixation mark, which is a GUI widget for receiving a selection operation of a presentation position, at each of a plurality of positions corresponding to a plurality of presentation positions in the observation image. Thereby, it is easy for the examiner to know the positions where the fixation mark can be moved by relying on the fixation mark.

[0016] The control unit further displays a current position button indicating the current position of the fixation mark on the fixation mark corresponding to the current position of the fixation mark. The control unit starts a selection operation by detecting an operation of the current position button. Thus, to move the position of the fixation mark, the current position button is operated. Therefore, since the examiner operates the button to be moved to move the position of the fixation mark, the operation can be performed intuitively.

[0017] The control unit superimposes and displays the fixation mark in the observation image by detecting an operation of the current position button. Thereby, the examiner can start a selection operation of the presentation position of the fixation mark by operating the current position button.

[0018] When the control unit detects an acceptance of a drag operation of the current position button to the position of an arbitrary fixation mark on the touch panel display, the control unit moves the fixation mark to the position corresponding to the fixation mark for which the drag operation was performed. Thereby, it is possible to reduce an unintended movement of the fixation mark that occurs when the examiner touches an incorrect coordinate when operating the GUI widget of the operation unit for moving the measurement unit, or when the examiner accidentally touches the operation unit when the subject opens the eyelids.

[0019] <If the control unit does not detect the reception of an operation on the current position button, it will hide the fixation mark on the fundus observation image. As a result, when the examiner does not operate the operation unit, that is, when the position of the fixation mark is not moved, the control unit will hide the fixation mark. Therefore, the fixation mark does not interfere with the observation of the frontal fundus observation image of the examined eye.

Embodiment

[0020] Next, a fundus imaging device 1, which is an example of a fundus imaging device according to an embodiment, will be described. The drawings referred to are used to explain the technical features that can be adopted in the present disclosure, and the configurations described are not intended to be limited thereto, but are merely illustrative examples. The fundus imaging device 1 acquires a captured image of the frontal image of the fundus of the examined eye E.

[0021] FIG. 1 is an external view of the fundus imaging device 1. In this embodiment, the fundus imaging device 1 includes a control unit 10, an imaging unit 11, a display unit 12, and an operation unit 13. As shown in FIG. 2, the imaging unit 11 includes an anterior segment observation optical system 20, a fixation optical system 30, an observation optical system 40, and an imaging optical system 50. In this embodiment, at least a part of the observation optical system 40 and the imaging optical system 50 is shared. Also, in this embodiment, the display unit 12 and the operation unit 13 are shared.

[0022] FIG. 2 is a schematic diagram of the anterior segment observation optical system 20, the fixation optical system 30, the observation optical system 40, and the imaging optical system 50 of the ophthalmic imaging device 1 in the imaging unit 11. In this embodiment, as shown in FIG. 2, these four optical systems share an objective optical system and are coaxial by a beam splitter / combiner (for example, a half mirror and a dichroic mirror, etc.).

[0023] The fixation optical system 30 may be an internal fixation lamp. The fixation optical system 30 guides the line-of-sight direction of the examined eye E by projecting a fixation mark (fixation light beam) onto the examined eye E. In this embodiment, the fixation optical system 30 can change the presentation position of the fixation mark two-dimensionally and can guide the examined eye E in a plurality of directions. As a result, the imaging site of the fundus of the examined eye E is changed.

[0024] Figure 3 is a schematic diagram of the fixation optical system. As shown in Figure 3, visible light emitted from the fixation target display 31 passes through the relay lens 33, dichroic mirror 34, imaging lens 35, focusing lens 36, perforated mirror 37, dichroic mirror 38, and objective lens 39 and is focused on the fundus of the eye E being examined. The subject views the visible light beam as a fixation target.

[0025] Figure 4 is a schematic diagram of the fixation target display unit. The fixation optical system 30 mainly comprises a fixation target display unit 31. The fixation target display unit 31 is arranged with a plurality of fixation lights that are selectively controlled to light up. The fixation target display unit 31 mainly comprises, for example, a fixation light 32. For example, a fixation light 32a is positioned at the fixation target position for acquiring a frontal fundus image centered on the macula of the eye under examination E. For example, a fixation light 32b is positioned at the fixation target position for acquiring a frontal fundus image such that the area between the macula and the optic nerve head of the eye under examination E is positioned in the center of the image. In addition, the fixation light 32 may be positioned at other positions, such as a fixation target position for acquiring a frontal fundus image centered on the optic nerve head of the eye under examination E, or a fixation target position for acquiring a wide-angle fundus image.

[0026] In this embodiment, as shown in Figure 4, the fixation target display body 31 is arranged with, for example, a plurality of fixation lights that emit visible light. Each fixation light forms a light-emitting dot (visible light source) that emits visible light. Here, visible light is light that can be seen by the eye under examination, and includes light in the infrared region such as wavelengths of 800 nm to 850 nm that can be seen by the eye under examination.

[0027] In this embodiment, an LED light source may be used as the fixation light. The fixation target display 31 may be a dot matrix display (for example, a dot matrix LED) in which the fixation lights are arranged two-dimensionally on a substrate. The fixation target display 31 is not limited to the above configuration, and an SLD (superluminescent diode) light source, an LD (laser diode) light source, etc., may be used as the fixation light. Furthermore, the fixation target display 31 may consist of multiple fixation lights arranged adjacent to each other vertically and horizontally (see Figure 4A), or multiple fixation lights may be arranged spaced apart from each other (see Figure 4B).

[0028] The fixation target indicator 31 allows the control unit 10 to selectively change the fixation position of the eye being examined by selectively controlling the illumination of each fixation lamp. Typically, one fixation lamp is selectively illuminated to guide the gaze direction of the eye being examined in one direction, but this is not limited to this, and multiple fixation lamps may be selectively illuminated.

[0029] The observation optical system 40 captures a two-dimensional reflection image of the fundus based on the reflected light from the fundus and acquires it as an observation image. The observation optical system 40 uses infrared light when acquiring a frontal image of the fundus of the subject's eye E as an observation image. The observation optical system 40 may be a scanning optical system or a non-scanning optical system. Examples of scanning optical systems include spot-scan type optical systems and line-scan type optical systems. In a spot-scan type optical system, a spot-shaped imaging light is scanned two-dimensionally on the fundus. In a line-scan type optical system, a line-shaped imaging light is scanned in one direction. An example of a non-scanning optical system is the optical system of a general fundus camera. For further details of the configuration of the observation optical system 40, please refer to, for example, the applicant's "JP 2019-118721 A," "JP 2019-141737 A," and "JP 2008-6105 A," etc.

[0030] The imaging optical system 50 captures a two-dimensional reflection image of the fundus based on the reflected light from the fundus and acquires it as a captured image. For example, the imaging optical system is an optical system that captures a frontal image of the fundus of the eye under examination. The imaging optical system may also include at least one of various imaging optical systems, such as a frontal fundus imaging optical system that captures a frontal image of the fundus of the eye under examination, or an OCT optical system that combines multiple scan patterns to capture OCT images of the eye under examination based on each scan pattern.

[0031] The anterior segment observation optical system 20 images the anterior segment of the eye E under examination and acquires it as an anterior segment observation image. In this embodiment, the anterior segment observation optical system 20 illuminates the anterior segment with infrared light as observation light, and acquires a frontal image of the anterior segment as an anterior segment observation image based on the reflected light. The anterior segment observation image is used for alignment and tracking control of the imaging unit 11 relative to the eye E under examination during fundus photography.

[0032] The control unit 10 is a processing unit (processor) that performs control processing for each part and calculation processing. The control unit 10 is equipped with a CPU, RAM, ROM, etc. Furthermore, for convenience, the control unit 10 is also intended to perform image processing on various images obtained by the ophthalmic imaging device 1. In other words, the control unit 10 also serves as the image processing unit.

[0033] The control unit 10 is electrically connected to various components such as the observation optical system 40, the memory unit 15, and the touch panel display (hereinafter referred to as the touch panel) 14 (which also serves as the display unit 12 and the operation unit 13).

[0034] The storage unit 15 may be a non-transient storage medium that can retain its contents even if the power supply is interrupted. For example, the storage unit 15 may store various control programs, fixed data, etc. Also, for example, the storage unit 15 may store images captured by the ophthalmic imaging device 1. The captured images may be transferred to an external storage device (for example, a storage device connected to the control unit 10 via LAN and WAN).

[0035] The touch panel 14 serves as both the display unit 12 and the operation unit 13 of the fundus imaging device 1. Various images are displayed on the touch panel 14. The touch panel 14 also displays a GUI and accepts operator input on GUI widgets. For example, operator input on the GUI via the touch panel 14 includes various touch operations such as dragging and tapping. Dragging is the operation of touching a GUI widget with a fingertip and sliding the GUI widget. Tapping is the operation of lightly touching a GUI widget with a fingertip and immediately releasing the GUI widget.

[0036] This embodiment describes the GUI used to acquire a frontal view of the fundus of the eye E being examined using the fundus imaging device 1. In this embodiment, the GUI described assumes a fundus examination using a fundus camera in the fundus imaging device.

[0037] Figure 5 shows the screen displayed on the touch panel 14 after the examiner has selected a fundus examination using a fundus camera. The touch panel 14 may also display an anterior segment observation image 60 acquired via the anterior segment observation optical system 20 for alignment purposes. Additionally, the touch panel 14 displays a frontal fundus observation image 61 acquired via the observation optical system 40 for fundus observation of the eye E being examined. A bright spot mask 62 to conceal the bright spot caused by the objective lens of the fundus imaging device 1 may be displayed in the center of the frontal fundus observation image 61. The touch panel 14 may also include an auto-alignment button 65 for automatically aligning the imaging unit 11 with respect to the eye E being examined, and a capture button 66 for acquiring a frontal fundus image.

[0038] In the frontal view of the fundus image 61, a current position button 63 indicating the current position of the fixation target is superimposed at the position corresponding to the fixation target presented to the eye E under examination. In the frontal view of the fundus image 61, the fixation target mark 64 (see Figure 6) is displayed at the position corresponding to the fixation lamp 32.

[0039] In this embodiment, the GUI used to acquire a frontal image of the fundus of the eye E examined by the fundus imaging device 1 will be explained in accordance with the operation flow of the fundus imaging device 1. In this embodiment, the operation of fundus examination using a fundus camera in the fundus imaging device will be explained.

[0040] To begin the examination, the control unit 10 first accepts an operation to select an examination pattern. In this case, the examination selection screen is displayed. Based on the operator's input via the examination selection screen, the content of the examination, including the imaging method, is determined.

[0041] Based on the operation input via the examination selection screen, when any examination is selected, the control unit 10 displays the selected button and the details of the corresponding shooting method (including combinations of multiple shooting methods) as text information on the touch panel 14. That is, the shooting conditions (scan conditions) for each shooting operation included in the shooting method selected based on the operation input are shown for each shooting operation. The shooting conditions may include, for example, conditions for shooting the retina, conditions for shooting the anterior segment of the eye, and conditions for shooting the fundus. Furthermore, the shooting conditions may be more detailed, with multiple types of scan conditions registered as modes. In this embodiment, the fundus camera mode, that is, the mode for shooting the fundus of the eye under examination E with a fundus camera, is selected.

[0042] When the fundus camera mode is selected, the control unit 10 determines the examination pattern based on the operator's input of the GUI widget for starting the examination, and transitions the display on the display unit 12 from the examination selection screen to the next screen (in this embodiment, the alignment screen).

[0043] When the control unit 10 starts alignment adjustment, it turns on the fixation lamp 32 of the fixation target display unit 31. The control unit 10 sequentially acquires observation images of the face and anterior segment via a face-capturing camera and anterior segment observation optical system 20 (not shown), respectively.

[0044] Next, as shown in Figure 5, in parallel with the display of the alignment observation screen, the control unit 10 adjusts the position of the imaging unit 11 relative to the eye E to a position where the eye E can be photographed, based on the observation image.

[0045] In this embodiment, when the control unit 10 detects that the examiner has operated the auto-alignment button 65, it automatically moves the position of the imaging unit 11 relative to the eye E under examination based on the anterior segment observation image 60. In this embodiment, after projecting alignment indicators and adjusting the positional relationship in each of the XYZ directions, the imaging optical axis is further adjusted in the XY direction so that it coincides with the center of the pupil. In addition, in this embodiment, the position of the imaging optical axis relative to the eye E under examination can be adjusted in the XYZ directions based on various touch operations on the anterior segment observation image 60. For example, when the control unit 10 receives an operation input for a region in the direction in which the imaging unit 11 should be moved on the anterior segment observation image 60, it moves the imaging unit 11 according to that direction. However, it is not necessarily limited to this, and for example, the control unit 10 may move the imaging unit 11 so that the imaging optical axis is moved to the position tapped by the examiner. Alternatively, the control unit 10 may perform pupil detection around the position tapped by the examiner and move the imaging unit 11 so that the imaging optical axis is moved to the center of the detected pupil region.

[0046] The examiner may move the presentation position of the fixation target to a desired position while the eye under examination E is visible in the anterior segment image via the anterior segment observation optical system 20. For example, the examiner may move the position of the fixation target while the eye under examination E is visible in the anterior segment image during the alignment adjustment of the imaging unit 11 with respect to the eye under examination E. Alternatively, the position of the fixation target may be moved, for example, after the alignment adjustment of the imaging unit 11 with respect to the eye under examination E is completed.

[0047] Figure 5 shows an example of the screen displayed on the touch panel 14 when the current position button 63 is not being operated. Figure 6 shows an example of the screen displayed on the touch panel 14 when it is accepting input for operation of the current position button 63. When the examiner is not operating the current position button 63 displayed on the touch panel 14, the control unit 10 displays only the current position button 63 as a GUI widget on the frontal fundus observation image 61, as shown in Figure 5. When the touch panel 14 accepts operation of the current position button 63, the control unit 10 superimposes the fixation target mark 64 on the frontal fundus observation image 61, as shown in Figure 6. The predetermined presentation positions of the fixation target mark 64 may vary depending on the shooting conditions.

[0048] Figure 7 shows an example of the screen displayed on the touch panel 14 when the examiner drags the current position button 63, which is displayed at the position of fixation target mark 64a, to the position of fixation target mark 64b. The examiner inputs an operation to the touch panel 14 by dragging the current position button 63 to the fixation target mark 64b. Note that fixation target marks 64a and 64b are in different positions. Furthermore, the same operation is possible not only between fixation target marks 64a and 64b, but also between any two fixation target marks that are in different positions. As the examiner drags the current position button 63, it moves from the position of fixation target mark 64a to the position of fixation target mark 64b. Based on the operation input received by the touch panel 14, the control unit 10 turns off the fixation lamp 32a at the position corresponding to fixation target mark 64a and turns on the fixation lamp 32b at the position corresponding to fixation target mark 64b, thereby moving the presentation position of the fixation targets. Thus, since moving the presentation position of the fixation target requires dragging the current position button to the desired fixation target mark, it is possible to prevent the fixation target from moving if the examiner unintentionally inputs an operation on the touch panel 14.

[0049] When the examiner lifts their finger from the touch panel 14, that is, when the touch panel 14 stops accepting input, the control unit 10 hides all fixation target marks 64 from the frontal fundus observation image 61, except for the current position button. In this way, by not displaying the fixation target marks 64 when the position of the fixation target is not moved, the fixation target marks do not interfere with the observation of the frontal fundus image of the eye under examination E.

[0050] Next, the control unit 10 detects that the touch panel 14 has received input from the capture button 66 and captures a frontal view image 61 of the fundus of the eye E being examined.

[0051] Through the above operations, the fundus imaging device in this embodiment makes it easier for the examiner to understand the movable position of the fixation target and to move the fixation target.

[0052] In this embodiment, we have described the case in which a frontal view of the fundus of the eye E under examination is acquired using a fundus photography device. However, a single ophthalmic modality such as a fundus camera may also be used. Alternatively, a device integrating two or more ophthalmic modalities may be used, as in the case of acquiring an observational image of the eye E under examination using OCT in Figure 5.

[0053] In this embodiment, the fixation target mark 64 was displayed by the control unit 10 detecting input from the current position button, but this is not limited to that. For example, the display of the fixation target mark 64 may be switched on or off by operating a GUI widget on the touch panel 14 for switching the display of the fixation target mark 64 on or off.

[0054] Figure 8 shows an example of a screen when performing an examination using an OCT optical system. For example, if the imaging optical system 50 includes an OCT optical system, the scan position for scanning the tissue of the eye E may be changeable by the scan line 61, which is a GUI widget on the touch panel 14. In this case, both the movement of the fixation target and the change of the scan position are performed using the GUI widget displayed on the touch panel 14. In order for the control unit 10 to move the fixation target, the operation input is to drag the current position button 63 to the fixation target mark 64, thereby preventing accidental operation of moving the fixation target position and changing the OCT scan pattern.

[0055] In this embodiment, the fixation target position was described for acquiring a color frontal image of the fundus. However, for example, when acquiring a frontal image of the fundus using fundus autofluorescence (FAF) imaging, the number of movable fixation target positions may be reduced compared to when acquiring a color frontal image of the fundus. For example, the fixation target mark 64 may superimpose the fixation target position for acquiring a frontal image of the fundus centered on the macula of the eye E, the fixation target position for acquiring a frontal image of the fundus where the midpoint between the macula and the optic nerve head of the eye E is positioned in the center of the frontal image, and the fixation target position for acquiring a frontal image of the fundus centered on the optic nerve head of the eye E.

[0056] Furthermore, depending on the method of capturing fundus images, it may not be appropriate to move the fixation target to the position desired by the examiner. For example, in panoramic imaging mode, which captures a wide frontal image of the fundus of the eye under examination, multiple fundus images with different fixation positions are combined into a panoramic image in order to acquire a wide frontal image of the fundus. In such cases where the fixation position is predetermined, the fixation target mark 64 may be hidden.

[0057] In this disclosure, the term "processor" refers to one or more hardware components configured to execute computer program code (i.e., one or more instructions of a computer program) contained within a computer program. In other words, a "processor" is a hardware device capable of executing one or more programmed processes. For example, a "processor" may be a general-purpose or application-specific processor, and may be at least one of a CPU, microprocessor, GPU, and DFP (data flow processor).

[0058] In this disclosure, the term “memory” refers to one or more hardware memories, which are non-transitional tangible recording media configured to record at least one of computer program code and data in a manner accessible from a processor. “Memory” can be implemented by memory technologies such as SRAM, SDRAM, non-volatile / flash type memory, or other types of memory. The computer program code constituting the computer program is recorded in memory and executed by the processor to enable various functions of the ophthalmic device 1.

[0059] In this disclosure, the term “circuit” refers to one or more logic circuits as hardware, configured to enable the ophthalmic device 1 to perform functions. In other words, “circuit” refers to one or more non-programmable devices. For example, “circuit” could be a custom IC designed to be non-programmable for a specific application.

[0060] In this disclosure, at least one of a circuit and a processor having memory storing computer program code enables the ophthalmic device 10 to function. The expression "at least one of a circuit and a processor" should be interpreted as disjunctive (logical OR) and not as at least one circuit and at least one processor. [Explanation of symbols]

[0061] 1 Ophthalmology equipment 10 Control Unit 12 Display section 13 Control section 14 Touch panel 20 Anterior segment observation optical system 30 Fixation optical system 40 Observation Optical System 50 Imaging Optical System 60 Anterior segment observation images 61 Frontal view of the fundus 63 Current Location Button 64 Fixation Target Mark

Claims

1. A fundus imaging device, A fixation optical system presents a fixation target to the eye under examination and is capable of moving the fixation target to a plurality of predetermined presentation positions, An observation optical system for acquiring an observational image of the fundus of the eye under examination, Display unit and An operating unit that accepts operation input, It comprises a control unit and, The fundus imaging apparatus is characterized in that the control unit displays the observed image of the fundus and superimposes fixation target marks, which are GUI widgets for accepting selection operations of the presentation positions, on each of the multiple positions corresponding to the multiple presentation positions in the observed image.

2. The fundus imaging device according to claim 1, The fundus imaging apparatus is characterized in that the control unit further displays a current position button indicating the current position of the fixation target on the fixation target mark corresponding to the current position of the fixation target, and starts the selection operation by detecting the operation of the current position button.

3. A fundus imaging device according to claim 1 or 2, The fundus imaging apparatus is characterized in that the pre-control unit starts superimposing the fixation target mark on the observation image by detecting the operation of the current position button.

4. A fundus imaging device according to any one of claims 1 to 3, The fundus imaging apparatus is characterized in that the control unit hides the fixation target mark on the fundus observation image if it does not detect that an operation has been received for the current position button.

5. A fundus imaging device according to any one of claims 1 to 4, The aforementioned operation unit and the aforementioned display unit are integrated as a touch panel display. The fundus imaging apparatus is characterized in that, when the control unit detects that the current position button has been dragged to any position of the fixation target mark on the touch panel display, it moves the fixation target to the position corresponding to the fixation target mark that was dragged.

Images