JP7344351B2 - Ophthalmological equipment and its operating method - Google Patents

Description

The present invention relates to an ophthalmological apparatus that presents a fixation target to a subject's eye and a method for operating the same.

In an ophthalmological examination using an ophthalmological apparatus (including various acts for acquiring data of the eye to be examined, such as examination, measurement, and photographing), fixation is performed in order to examine a desired part of the eye to be examined. Fixation is achieved by presenting a fixation target to the eye to be examined and having the eye to be examined gaze at the fixation target.

Internal fixation is well known as fixation (see Patent Document 1 or 2). Internal fixation is a fixation method in which the luminous flux of a fixation target (bright spot image) displayed by an optotype display unit such as a dot matrix liquid crystal display or a matrix light emitting diode is projected onto the subject's eye through an objective lens using an optical system. It is a visual method. In this internal fixation, the presentation position of the fixation target relative to the subject's eye can be freely set.

For example, when acquiring data on the macula of the fundus, the optical system projects the light flux of the fixation target displayed at the display position corresponding to the macula in the optotype display section to the subject's eye through the center of the objective lens. be done. When the subject's eye fixates (gazes) this fixation target, the macula is guided to the examination (imaging) position.

In addition, when acquiring data on the periphery of the fundus, the optical system passes the light flux of the fixation target displayed at the display position corresponding to the periphery of the fundus in the optotype display section through the periphery of the objective lens. Projected onto the eye to be examined. When the eye to be examined fixates on this fixation target, the eye to be examined is largely rotated, so that the peripheral part of the fundus is guided to the examination position.

Japanese Patent Application Publication No. 2018-038687 Japanese Patent Application Publication No. 2017-143919

By the way, when a fixation target is presented to the subject's eye through the center of the objective lens, such as in a macular examination, the fixation target is located in the center area of the subject's visual field, so it is difficult to determine the direction of the subject's eye's line of sight. It is easy to guide the fixation target to the fixation target. As a result, the eye to be examined can easily fixate the fixation target. On the other hand, when presenting a fixation target to the examinee's eye through the peripheral part of the objective lens, such as when examining the peripheral part of the fundus, the fixation target does not exist in the central area of the examinee's field of vision. There is a risk of losing sight of the fixation target, making it difficult to guide the subject's eye to fixate. Therefore, there is a problem in that the optimal method of presenting the fixation target to the subject's eye differs depending on the position where the light flux of the fixation target passes through the objective lens.

The present invention has been made in view of the above circumstances, and provides an ophthalmological device and an ophthalmological apparatus for presenting a fixation target to the eye to be examined in an optimal manner corresponding to the position where the light flux of the fixation target passes through the objective lens. The purpose is to provide an operating method.

An ophthalmologic apparatus for achieving the object of the present invention includes an objective lens, an optotype display unit that displays a fixation target, and a light beam of the fixation target displayed on the optotype display unit projected onto the subject's eye through the objective lens. a fixation target presentation unit having an optical system to The position control unit controls the position of the optotype when an area within a certain range centered on the optical axis of the objective lens is defined as the center of the lens, and an area outside the center of the lens is defined as the periphery of the lens. When the target position is within the center of the lens, the fixation target presentation unit executes a restriction control that limits the target position to the target position, and when the target position is within the periphery of the lens, the target position is limited to the center of the lens. The fixation target presentation unit is caused to execute movement control to move the fixation target from the reference position to the target position.

According to this ophthalmological device, when the target position is within the center of the lens, the fixation position of the subject's eye is quickly guided to the target position by performing limited control, and conversely, when the target position is within the periphery of the lens. By performing movement control, the fixation position of the subject's eye can be reliably guided from the reference position to the target position.

In the ophthalmologic apparatus according to another aspect of the present invention, when the position control unit causes the fixation target presentation unit to execute movement control, the position control unit causes the target display unit to display a trajectory image indicating the trajectory of the target position. The apparatus includes a display control section, and an optical system projects a light beam of a locus image displayed on the optotype display section through an objective lens onto the subject's eye. Thereby, the fixation position of the eye to be examined can be reliably guided toward the target position.

An ophthalmologic apparatus according to another aspect of the present invention includes a gaze position detection unit that detects the gaze position of the subject's eye in the objective lens, and based on the detection result of the gaze position detection unit, gaze position information indicating the gaze position is transmitted to the optotype. The information display control section includes an information display control section that causes the display section to display the information, and the optical system projects a luminous flux of the line-of-sight position information displayed on the optotype display section onto the subject's eye through the objective lens. This allows the subject to recognize the amount and direction of deviation between the target position and the line of sight position, so that the fixation position of the subject's eye can be reliably guided to the target position.

An ophthalmologic apparatus according to another aspect of the present invention includes a gaze position detection section that detects the gaze position of the subject's eye in the objective lens, and the position control section controls the gaze position when causing the fixation target presentation section to execute movement control. Based on the detection result of the position detecting section, the fixation target presenting section is caused to perform correction control for correcting the positional deviation of the visual target position with respect to the line of sight position. Thereby, the fixation position of the eye to be examined can be reliably guided to the target position.

In the ophthalmologic apparatus according to another aspect of the present invention, the position control unit causes the fixation target presentation unit to control the moving speed of the target position or control the position of the target position as correction control.

In the ophthalmological apparatus according to another aspect of the present invention, the optotype display control section controls the display of the fixation target by the optotype display section, and the display mode of the fixation target to be displayed on the optotype display section is controlled over time. The display device includes an optotype display control unit that causes the optotype display unit to display a specific image that is changed or determined in advance as a fixation target. This can attract the subject's attention, making it easier to guide the subject's eye to the fixation target.

In the ophthalmological apparatus according to another aspect of the present invention, the reference position is the position of the optical axis of the objective lens.

In the ophthalmological apparatus according to another aspect of the present invention, when there are a plurality of target positions, the position control unit causes the fixation target presentation unit to sequentially perform limiting control or movement control for each target position, and the position control unit When switching the target position from a position within the lens center to a position within the lens periphery, the target position within the lens center is set as a reference position. Thereby, the guidance time when guiding the fixation position of the eye to be examined to the target position can be shortened.

In the ophthalmologic apparatus according to another aspect of the present invention, the position control section controls the display position of the fixation target displayed on the optotype display section as the control of the optotype position.

A method for operating an ophthalmological apparatus to achieve the object of the present invention includes an objective lens, an optotype display section that displays a fixation target, and a light flux of the fixation target displayed on the optotype display section that is transmitted through the objective lens. a fixation target presentation unit having an optical system for projecting the image onto the optometrist; a position control unit that controls the fixation target presentation unit to control the target position, which is the position at which the light flux of the fixation target passes through the objective lens; In the method of operating an ophthalmological apparatus, the position control unit sets an area within a certain range centered on the optical axis of the objective lens as the lens center, and sets an area outside the lens center as the lens periphery. In this case, when the target position of the optotype is within the center of the lens, the fixation target presentation section is caused to execute a limiting control that limits the optotype to the target position, and when the target position is within the periphery of the lens, The fixation target presentation section is caused to execute movement control for moving the target position from the reference position in the center of the lens to the target position.

According to the present invention, a fixation target can be presented to the subject's eye in an optimal manner corresponding to the position where the light beam of the fixation target passes through the objective lens.

FIG. 1 is a schematic diagram showing an example of the configuration of an ophthalmologic apparatus according to a first embodiment. FIG. 3 is a functional block diagram of an arithmetic and control unit. FIG. 3 is an explanatory diagram for explaining an example of a fixation target presented to the eye to be examined. FIG. 3 is an explanatory diagram for explaining an example of a fixation target presented to the eye to be examined. FIG. 3 is an explanatory diagram for explaining an example of a fixation target presented to the eye to be examined. FIG. 3 is an explanatory diagram for explaining an example of a fixation target presented to the eye to be examined. FIG. 2 is an explanatory diagram showing an example of the relationship between the examination target site of the fundus of the eye and the display position of the fixation target within the display surface of the optotype display unit. FIG. 3 is an enlarged front view of the objective lens seen from the subject side. FIG. 3 is an explanatory diagram for explaining limited control by a display control unit. FIG. 3 is an explanatory diagram for explaining movement control by a display control unit. FIG. 7 is an explanatory diagram for explaining a modification of the reference position when movement control is performed by the display control unit. 2 is a flowchart illustrating the process of examining an eye to be examined by the ophthalmological apparatus, particularly the process of presenting a fixation target to the eye to be examined. It is a schematic diagram showing an example of composition of an ophthalmologic device of a 2nd embodiment. FIG. 2 is a functional block diagram of an arithmetic and control unit according to a second embodiment. FIG. 3 is an explanatory diagram for explaining a gaze position detection method of a gaze position detection unit using a Purkinje image. FIG. 3 is an explanatory diagram for explaining a method of detecting the line-of-sight direction of the eye to be examined based on captured image data of the eye to be examined. FIG. 7 is an explanatory diagram for explaining movement control by a display control unit according to a second embodiment. FIG. 7 is an explanatory diagram for explaining correction control by a display control unit of the second embodiment.

[Ophthalmological apparatus of first embodiment]
FIG. 1 is a schematic diagram showing an example of the configuration of an ophthalmologic apparatus 1 according to the first embodiment. The ophthalmologic apparatus 1 is a multifunction device that combines a fundus camera and an optical coherence tomometer that obtains tomographic images using optical coherence tomography (OCT).

As shown in FIG. 1, the ophthalmologic apparatus 1 includes a fundus camera unit 2, an OCT unit 100, an arithmetic control unit 200, and the like. The fundus camera unit 2 has almost the same optical system as a conventional fundus camera. The OCT unit 100 is provided with an optical system for acquiring an OCT image of the fundus Ef. The arithmetic control unit 200 is an arithmetic processing device such as a personal computer that executes various arithmetic processing and control processing.

[Fundus camera unit]
The fundus camera unit 2 includes an illumination optical system 10 and a photographing optical system 30 as optical systems for acquiring a two-dimensional image (fundus image) representing the surface form of the fundus Ef of the eye E to be examined. The illumination optical system 10 irradiates the fundus Ef with illumination light. The photographing optical system 30 guides the fundus reflected light of the illumination light reflected by the fundus Ef to CMOS (Complementary Metal Oxide Semiconductor) or CCD (Charge Coupled Device) type image sensors 35 and 38. Further, the imaging optical system 30 guides the signal light output from the OCT unit 100 to the fundus Ef, and guides the signal light that has passed through the fundus Ef to the OCT unit 100.

The illumination optical system 10 includes an observation light source 11, a reflection mirror 12, a condensing lens 13, a visible cut filter 14, a photographing light source 15, a mirror 16, relay lenses 17 and 18, an aperture 19, a relay lens 20, an aperture mirror 21, and a dichroic lens. It includes a mirror 46, an objective lens 22, and the like.

The photographing optical system 30 includes, in addition to the objective lens 22, dichroic mirror 46, and apertured mirror 21 described above, a dichroic mirror 55, a focusing lens 31, a mirror 32, a half mirror 39A, an optotype display section 39, and a dichroic mirror. 33, a condenser lens 34, an image sensor 35, a mirror 36, a condenser lens 37, an image sensor 38, and the like.

The observation light source 11 is, for example, a halogen lamp or an LED (Light Emitting Diode) light source, and emits observation illumination light. The observation illumination light emitted from the observation light source 11 is reflected by the reflection mirror 12, passes through the condensing lens 13, and passes through the visible cut filter 14 to become near-infrared light. Furthermore, the observation illumination light is once focused near the photographing light source 15, reflected by the mirror 16, and passes through relay lenses 17, 18, an aperture 19, and a relay lens 20. The observation illumination light is reflected at the periphery of the apertured mirror 21 (the area around the aperture), passes through the dichroic mirror 46, is refracted by the objective lens 22, and illuminates the fundus Ef.

The fundus reflected light of the observation illumination light is refracted by the objective lens 22, passes through the dichroic mirror 46, passes through the hole formed in the center area of the apertured mirror 21, passes through the dichroic mirror 55, and passes through the focusing lens. 31 and is reflected by a mirror 32. Furthermore, this fundus reflected light passes through the half mirror 39A, is reflected by the dichroic mirror 33, and is imaged by the condenser lens 34 on the light receiving surface of the image sensor 35. The image sensor 35 images (receives) the fundus reflected light and outputs an image signal. The display device 3 displays an observed image based on the imaging signal output from the image sensor 35. Note that when the focus of the photographing optical system 30 is adjusted to the anterior eye segment Ea of the eye E, the observation image of the anterior eye segment Ea is displayed on the display device 3, and the focus of the photographing optical system 30 is adjusted to the fundus Ef. When the adjustment has been made, an observation image of the fundus Ef is displayed on the display device 3.

The photographing light source 15 is, for example, a xenon lamp or an LED light source, and emits photographic illumination light. The photographic illumination light emitted from the photographic light source 15 passes through the same path as the observation illumination light described above and is irradiated onto the fundus Ef. The fundus reflected light of the imaging illumination light is guided to the dichroic mirror 33 through the same path as the fundus reflected light of the observation illumination light, passes through the dichroic mirror 33, is reflected by the mirror 36, and is sent to the image sensor by the condensing lens 37. The image is formed on the light receiving surface of 38.

The image sensor 38 images (receives) the fundus reflected light and outputs an image signal. The display device 3 displays a photographed image based on the imaging signal output from the image sensor 38. Note that the display device 3 that displays observed images and the display device 3 that displays photographed images may be the same or different.

The optotype display section 39 uses various display devices (devices) such as a dot matrix liquid crystal display (LCD) and a matrix light emitting diode (LED). This visual target display section 39 displays a fixation target 90. Furthermore, since the visual target display unit 39 is a dot matrix LCD or the like, the display mode (shape, etc.) and display position of the fixation target 90 can be arbitrarily set. Note that the optotype display section 39 can also display an optotype for visual acuity measurement in addition to the fixation target 90.

A part of the luminous flux of the fixation target 90 displayed on the visual target display section 39 is reflected by the half mirror 39A, and then passes through the mirror 32, the focusing lens 31, the dichroic mirror 55, and the hole of the perforated mirror 21. , the dichroic mirror 46, and the objective lens 22, and are projected onto the eye E to be examined. Thereby, the fixation target 90, the optotype for visual acuity measurement, etc. can be presented to the eye E to be examined. Note that the portion from the half mirror 39A described above to the objective lens 22 corresponds to the optical system of the present invention. Therefore, in this embodiment, a part of the photographing optical system 30 functions as the fixation target presenting section of the present invention.

Further, the fundus camera unit 2 includes an alignment optical system 50 and a focus optical system 60, like a conventional fundus camera. The alignment optical system 50 generates an alignment index for aligning the fundus camera unit 2 with respect to the eye E to be examined. The focus optical system 60 generates a split index for focusing on the fundus Ef.

The alignment optical system 50 includes an LED 51, an aperture 52, 53, and a relay lens 54 in addition to the objective lens 22, dichroic mirror 46, apertured mirror 21, and dichroic mirror 55 described above. In addition to the objective lens 22, dichroic mirror 46, and perforated mirror 21 described above, the focus optical system 60 includes an LED 61, a relay lens 62, a split index plate 63, a two-hole diaphragm 64, a mirror 65, and a condenser lens. 66 and a reflecting rod 67.

The alignment light emitted from the LED 51 of the alignment optical system 50 passes through the apertures 52 and 53 and the relay lens 54, is reflected by the dichroic mirror 55, passes through the hole of the perforated mirror 21, and is transmitted through the dichroic mirror 46. , are projected onto the cornea of the anterior segment Ea of the eye E to be examined by the objective lens 22.

The corneal reflected light of the alignment light passes through the objective lens 22, the dichroic mirror 46, and the hole of the apertured mirror 21, and a part of it passes through the dichroic mirror 55, and then passes through the focusing lens 31, the mirror 32, and the half mirror. 39A, the dichroic mirror 33, and the condensing lens 34, the light enters the light receiving surface of the image sensor 35.

The image sensor 35 images (receives) corneal reflected light of the alignment light and outputs an image signal. As a result, the alignment index is displayed on the display device 3 together with the previously described observation image of the anterior segment Ea. Then, the user performs the alignment by performing operations similar to those of a conventional fundus camera. Alternatively, the alignment (auto alignment) may be performed by the arithmetic and control unit 200 analyzing the position of the alignment index and moving the optical system.

The reflective surface of the reflective rod 67 is set on the optical path of the illumination optical system 10 when the focus optical system 60 performs focus adjustment. The focus light emitted from the LED 61 passes through the relay lens 62 and is separated into two beams by the split index plate 63, then passes through the two-hole diaphragm 64, the mirror 65, and the condensing lens 66, and is reflected by the reflection bar 67. An image is once formed on the surface and reflected toward the relay lens 20 on this reflective surface. Further, the focused light passes through the relay lens 20, the perforated mirror 21, the dichroic mirror 46, and the objective lens 22, and is projected onto the fundus Ef.

The fundus reflected light of the focus light is imaged by the image sensor 35 through the same path as the corneal reflected light of the alignment light. The image sensor 35 images the fundus reflected light of the focus light and outputs an image signal. As a result, the split index is displayed on the display device 3 together with the observed image. A calculation and control unit 200, which will be described later, analyzes the position of the split index and moves the focusing lens 31 and the like to automatically adjust the focus, as in the conventional case. Alternatively, the user may manually adjust the focus while visually checking the split index.

The dichroic mirror 46 branches an optical path for OCT measurement from an optical path for photographing the fundus. The dichroic mirror 46 reflects light in a wavelength band used for OCT measurement and transmits light for fundus photography. The optical path for OCT measurement includes, in order from the OCT unit 100 side, a collimator lens unit 40, an optical path length changing section 41, a galvano scanner 42, a focusing lens 43, a mirror 44, and a relay lens 45. It is provided.

The optical path length changing unit 41 is movable in the direction of the arrow shown in FIG. 1, and changes the optical path length of the optical path for OCT measurement. This change in the optical path length is used for correcting the optical path length according to the axial length of the eye E to be examined, adjusting the interference state, and the like. The optical path length changing unit 41 includes, for example, a corner cube and a mechanism for moving the corner cube.

The galvano scanner 42 changes the traveling direction of the signal light passing through the optical path for OCT measurement. Thereby, the fundus Ef can be scanned with the signal light. The galvano scanner 42 includes, for example, a galvano mirror that scans signal light in the X direction, a galvano mirror that scans in the Y direction, and a mechanism that independently drives these. Thereby, the signal light can be scanned in any direction on the XY plane.

The fundus camera unit 2 is provided with two anterior segment cameras 300. Each anterior eye segment camera 300 images the anterior eye segment Ea from different directions substantially simultaneously. Further, each anterior segment camera 300 is provided at a position away from the optical path of the illumination optical system 10 and the optical path of the photographing optical system 30. Then, each anterior segment camera 300 obtains a photographed image of the eye E to be examined in a state where the eye E to be examined is in substantially the same position (orientation). Each photographed image is used by the arithmetic and control unit 200 to analyze the three-dimensional position of a characteristic part of the eye E to be examined.

[OCT unit]
The OCT unit 100 includes an optical system used to obtain an OCT image of the fundus Ef. This optical system has a similar configuration to a conventional OCT device. That is, this optical system splits low coherence light into reference light and signal light, causes the signal light that has passed through the fundus Ef to interfere with the reference light that has passed through the reference optical path, and generates interference light. Detect spectral components. This detection result (detection signal) is output from the OCT unit 100 to the arithmetic control unit 200. Note that the specific configuration of the optical system of the OCT unit 100 is a publicly known technology (see, for example, Patent Documents 1 and 2 above), so a specific explanation will be omitted here.

[Calculation control unit]
FIG. 2 is a functional block diagram of the arithmetic and control unit 200. As shown in FIG. 2, the arithmetic control unit 200 includes an overall control section 202, a storage section 204, an image forming section 206, a data processing section 208, and the like. Note that in this embodiment, what is described as "unit" in the arithmetic and control unit 200 may also be "circuit", "apparatus", or "equipment". That is, what is described as "unit" may be composed of firmware, software, hardware, or a combination thereof. Furthermore, in addition to the aforementioned components of the fundus camera unit 2, the display device 3, and the OCT unit 100, an operation section 210 is connected to the arithmetic and control unit 200. The operation unit 210 is a known operation device such as an operation lever, a keyboard, a mouse, and a touch panel monitor, and accepts various input operations by the examiner.

The overall control unit 202 controls the operations of the fundus camera unit 2, the display device 3, and the OCT unit 100 in accordance with input operations to the operation unit 210 by the examiner. Note that, in FIG. 2, among the various functions of the overall control unit 202, only the function related to display control of the fixation target 90 is illustrated, and since the other functions are known techniques, specific illustration thereof will be omitted.

The functions of the overall control unit 202 can be realized using various processors. Various processors include CPU (Central Processing Unit), GPU (Graphics Processing Unit), ASIC (Application Specific Integrated Circuit), and programmable logic devices [for example, SPLD (Simple Programmable Logic Devices), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Arrays)]. Note that the various functions of the overall control unit 202 may be realized by one processor, or may be realized by a plurality of processors of the same type or different types.

The storage unit 204 stores, in addition to the control program executed by the processor of the overall control unit 202, image data of OCT images, image data of fundus images, and eye information to be examined (including patient information). The storage unit 204 also stores correspondence information 212, which will be described in detail later.

The image forming unit 206 analyzes the detection signal input from the OCT unit 100 and forms an OCT image of the fundus Ef. Note that the specific method of forming an OCT image is the same as that of a conventional OCT apparatus. The data processing unit 208 performs image processing and the like on the OCT image formed by the image forming unit 206 and the images (fundus image and anterior segment image) acquired by the fundus camera unit 2 described above.

[Fixation target presentation (display) control]
When presenting the fixation target 90 to the eye E to be examined, the overall control unit 202 functions as the display control unit 214 by executing the control program read from the storage unit 204. Note that the display control section 214 corresponds to a position control section, a trajectory display control section, and an optotype display control section of the present invention.

3 to 6 are explanatory diagrams for explaining an example of the fixation target 90 that the display control unit 214 displays on the visual target display unit 39, that is, the fixation target 90 that is presented to the eye E to be examined. Here, the display control section 214 functions as an optotype display control section of the present invention.

As shown in FIGS. 3 to 5, the display control unit 214 changes the display mode of the fixation target 90 over time when displaying the fixation target 90 on the optotype display unit 39. For example, as shown in FIG. 3, the display control unit 214 causes the visual target display unit 39 to display a fixation target 90 that rotates (rotates) with the center of the fixation target 90 as a reference. Further, as shown in FIG. 4, the display control unit 214 causes the visual target display unit 39 to display a fixation target 90 that is repeatedly enlarged and contracted. Furthermore, as shown in FIG. 5, the display control unit 214 displays the fixation target 90, which includes rotating numbers and has a display mode in which the numbers change over time, on the target display unit 39. Display. By changing the display mode of the fixation target 90 displayed on the visual target display section 39 over time in this manner, it is possible to attract the subject's attention. This makes it easier to guide the eye E to the fixation target 90.

As shown in FIG. 6, the display control unit 214 may cause the visual target display unit 39 to display a predetermined specific image (animal, vehicle, character appearing in fiction, etc.) as the fixation target 90. . In this case as well, the subject's attention can be drawn, making it easier to guide the subject's eye E to the fixation target 90.

The display control unit 214 controls the display position of the fixation target 90 to be displayed on the optotype display unit 39 based on the designation operation of the examination (imaging) target region of the fundus Ef inputted by the examiner into the operation unit 210. Then, the display control unit 214 controls the display position of the fixation target 90 displayed on the optotype display unit 39 to determine the optotype position, which is the position where the light flux of the fixation target 90 passes through the objective lens 22. , in the direction perpendicular to the optical axis OA (see FIG. 8) of the objective lens 22 (XY direction: see FIG. 1). That is, the display control unit 214 controls the presentation position of the fixation target 90 to be presented to the eye E in the above-mentioned vertical direction. Hereinafter, the position where the light beam of the fixation target 90 displayed on the visual target display section 39 at the display position corresponding to the above-described designation operation passes through the objective lens 22 will be referred to as the "target position."

FIG. 7 is an explanatory diagram showing an example of the relationship between the examination target region of the fundus Ef and the display position of the fixation target 90 within the display surface of the optotype display section 39.

As shown in FIG. 7, the symbol "M" is the display position of the fixation target 90 corresponding to the macula of the fundus Ef of both eyes of the eye E to be examined. Note that this display position M corresponds to the position of the optical axis OA of the objective lens 22 (see FIG. 8). That is, the light beam of the fixation target 90 displayed at the display position M passes through the optical axis OA of the objective lens 22.

The symbol "CR" is the display position of the fixation target 90 corresponding to the fundus center of the fundus Ef of the right eye of the subject's eye E, and the symbol "CL" is the display position of the fixation target 90 corresponding to the fundus center of the fundus Ef of the left eye of the subject's eye E. This is the display position of the corresponding fixation target 90. The symbol "DR" is the display position of the fixation target 90 corresponding to the optic disc of the fundus Ef of the right eye of the subject's eye E, and the symbol "DL" is the display position of the fixation target 90 corresponding to the optic disc of the fundus Ef of the left eye of the subject's eye E. This is the display position of the corresponding fixation target 90. The symbol "P" indicates the display position of the fixation target 90 corresponding to eight positions in the fundus periphery of the fundus Ef of both eyes of the eye E to be examined.

Note that the display position of the fixation target 90 displayed on the visual target display section 39 is not limited to the position shown in FIG. 7, and may be changed as appropriate. Furthermore, display positions corresponding to other examination target regions (for example, intermediate positions between the macula and the optic disc) may be added.

As described above, the light beam of the fixation target 90 displayed on the visual target display section 39 passes through the half mirror 39A, the dichroic mirror 46, and then is projected onto the eye E through the objective lens 22. Thereby, the fixation target 90 can be presented to the eye E to be examined, and the eye E can be made to fixate the fixation target 90.

FIG. 8 is an enlarged front view of the objective lens 22 seen from the subject side. As shown in FIG. 8 and FIG. 7 described above, the luminous flux of the fixation target 90 displayed at the display position M of the optotype display section 39 is transmitted to the optotype position TM in the lens center portion 22a of the objective lens 22, which will be described later. (corresponding to the optical axis OA) and is projected onto the eye E to be examined. As a result, the eye E (right eye and left eye) fixates the fixation target 90 on the target position TM, and the fundus E The macula is moved.

The light beam of the fixation target 90 displayed at the display position CR of the optotype display section 39 is projected onto the eye E through the optotype position TCR within the lens center portion 22a. Further, the light flux of the fixation target 90 displayed at the display position CL of the optotype display section 39 is projected onto the eye E through the optotype position TCL within the lens center portion 22a. As a result, the right eye of the eye E to be examined fixates the fixation target 90 on the optotype position TCR, or the left eye fixates the fixation target 90 on the optotype position TCL, thereby improving the fundus. The center of the fundus of Ef is moved to the signal light irradiation position described above.

The luminous flux of the fixation target 90 displayed at the display position DR of the optotype display section 39 is projected onto the eye E through the target position TDR within the lens peripheral portion 22b, which will be described later, of the objective lens 22. Further, the light beam of the fixation target 90 displayed at the display position DL of the optotype display section 39 is projected onto the eye E through the optotype position TDL within the lens peripheral portion 22b. As a result, the right eye of the eye E to be examined fixates the fixation target 90 on the optotype position TDR, or the left eye fixates the fixation target 90 on the optotype position TDL, thereby improving the fundus. The optic disc of Ef is moved to the signal light irradiation position described above.

The luminous flux of the fixation target 90 displayed at each display position P of the optotype display section 39 is projected onto the eye E through each target position TP within the lens peripheral portion 22b. As a result, the eye E (right eye and left eye) fixates the fixation target 90 on any one of the target positions TP, thereby fixing the eye at eight peripheral areas of the fundus Ef. is moved to the signal light irradiation position described above.

The lens center portion 22a is an area within a certain range centered on the optical axis OA of the objective lens 22, and in this embodiment includes the already described optotype position TM and optotype positions TCR and TCL. Here, when the subject's eye E fixates on the fixation target 90 that has passed through the optotype position TM and the optotype positions TCR and TCL of the objective lens 22, the fixation target 90 is located at the center of the visual field range of the subject. Since it is located in the area, there is no need to rotate the eye E to be examined significantly. Therefore, the eye E to be examined can be easily guided to the fixation target 90. Therefore, the lens center portion 22a is a region within the objective lens 22 in which the eye E to be examined can be easily guided to the fixation target 90.

Note that the lens center portion 22a is not limited to the range shown in FIG. 8 in the objective lens 22, but may be a range that includes only the optotype position TM, or a range that includes up to the optotype positions TDR and TDL. Alternatively, it may be a range that includes an optotype position corresponding to another examination target site of the fundus Ef (such as an intermediate position between the macula and the optic disc).

The lens peripheral portion 22b is an area outside the lens center portion 22a described above in the objective lens 22, and includes the target positions TDR and TDL and the target position TP described above in this embodiment. Here, when the eye E fixates on the fixation target 90 that has passed through the target positions TDR, TDL and TP of the objective lens 22, the fixation target 90 is located at the center of the visual field range of the subject. Since it does not exist in the area, it is necessary to rotate the eye E by a large amount. Therefore, there is a risk that the eye E to be examined may lose sight of the fixation target 90, and it is difficult to guide the eye E to be examined to the fixation target 90.

Therefore, the display control unit 214 controls the visual field depending on whether the target position (each target position TP, TCR,...TP) corresponding to the region to be inspected is within the lens center 22a or within the lens periphery 22b. The display control method of the fixation target 90 by the target display unit 39 is switched. As a result, the position control method for the visual target position of the fixation target 90 differs depending on whether the target position is within the lens center portion 22a or within the lens peripheral portion 22b.

At this time, the storage unit 204 shown in FIG. Correspondence information 212 shown is stored. The display control method for the fixation target 90 includes limited control corresponding to the target position (target position TM, TCR, TCL) in the lens center part 22a, and target position (target position TDR, TCL) in the lens peripheral part 22b. movement control corresponding to TDL, TP).

Then, the display control unit 214 refers to the correspondence information 212 in the storage unit 204 based on the inspection target region designated by the designation operation on the operation unit 210, and determines when the target position is within the lens center 22a. causes the optotype display unit 39 to execute limited control, and when the target position is within the lens peripheral portion 22b, causes the optotype display unit 39 to execute movement control.

FIG. 9 is an explanatory diagram for explaining limited control by the display control unit 214. In the example shown in FIG. 9, it is assumed that the center of the fundus Ef of the eye E (right eye) to be examined is designated as the region to be examined.

As shown in FIG. 9, when the target position is the optotype position TCR, the display control unit 214 performs limited control corresponding to the optotype position TCR in the lens center portion 22a on the optotype display unit based on the correspondence information 212. 39 to execute it. In this case, the display control section 214 controls the optotype display section 39 so that the optotype position of the fixation target 90 is limited to the target position (here, the optotype position TCR). Specifically, the display control unit 214 limits the display position of the fixation target 90 within the visual target display unit 39 to the display position CR. Thereby, unlike the movement control described later, the fixation target 90 can be promptly presented to the eye E to be examined.

FIG. 10 is an explanatory diagram for explaining movement control by the display control unit 214. In the example shown in FIG. 10, it is assumed that one location in the fundus periphery of the fundus Ef of the eye E to be examined (either the right eye or the left eye is acceptable) is designated as the region to be examined. In this case, the display control section 214 functions as a position control section of the present invention.

As shown by reference numeral XA in FIG. 10, when the target position is the optotype position TP, the display control unit 214 displays the movement control corresponding to the optotype position TP within the lens peripheral portion 22b based on the correspondence information 212. The mark display unit 39 is made to execute. First, the display control unit 214 displays the fixation target 90 on the optotype display unit 39 so that the position of the fixation target 90 matches (including substantially matches) a predetermined reference position within the lens center portion 22a. Display. Here, the reference position in this embodiment is the position of the optical axis OA, and the display control unit 214 displays the fixation target 90 at the display position M of the visual target display unit 39. Thereby, the fixation target 90 is located in the central region of the visual field of the subject, so the eye E to be examined can easily fixate the fixation target 90.

Next, the display control unit 214 moves the optotype position of the fixation target 90 from the reference position toward the target position (here, the optotype position TP) designated by the designation operation, as indicated by the arrow α in the figure. Display control of the optotype display unit 39 is performed so as to perform the display control. Note that the arrow α indicates the moving direction of the fixation target 90, and the arrow α may not actually be displayed on the visual target display section 39, or may be displayed.

Specifically, the display control unit 214 moves the display position of the fixation target 90 within the visual target display unit 39 from the display position M toward the display position P. At this time, the moving speed of the fixation target 90 is set to a speed at which the eye E to be examined does not lose sight of the fixation target 90. As a result, the target position of the fixation target 90 slowly moves from the reference position (optical axis OA) toward the target position (target position TP), as indicated by symbol XB in FIG. The fixation position can be guided from the reference position to the target position.

In addition, when causing the visual target display unit 39 to perform the movement control described above, the display control unit 214 also controls a fixation target that moves from the display position M corresponding to the reference position to the display position P corresponding to the target position. 90 is displayed on the optotype display section 39. In this case, the display control section 214 functions as a trajectory display control section of the present invention.

The light flux of the locus image 92 displayed on the visual target display section 39 is projected onto the eye E through the objective lens 22 from the half mirror 39A together with the light flux of the fixation target 90. As a result, a trajectory image 92 showing the trajectory of the optotype position of the fixation target 90 moving from the reference position toward the target position (optotype position TP) on the objective lens 22 is presented to the eye E to be examined. Thereby, the fixation position of the eye E to be examined can be reliably guided from the reference position to the optotype position TP.

In this way, the display control unit 214 causes the optotype display unit 39 to perform limited control when the target position specified by the designation operation on the operation unit 210 is within the lens center 22a, and this target position is set around the lens periphery. If it is within the section 22b, the optotype display section 39 is caused to execute movement control.

In addition, in the OCT examination of the eye E to be examined, a plurality of target positions may be sequentially presented to the eye E to be examined. In this case, the display control unit 214 performs limited control or The visual target display unit 39 is caused to execute movement control in order.

FIG. 11 is an explanatory diagram for explaining a modification of the reference position when movement control is performed by the display control unit 214. Here, an example will be explained in which the target position is switched from a position within the lens center 22a (target position TCR: see code XIA) to a position within the lens peripheral part 22b (target position TP: see code XIB). I do.

As shown in FIG. 11, the display control unit 214 uses the previous target position, that is, the target position TCR in the lens center 22a as a reference position, and updates the target position of the fixation target 90 from this reference position. The optotype display unit 39 is caused to perform movement control to move toward the target position.

In this way, when switching the target position from a position in the lens center 22a to a position in the lens peripheral part 22b, by using the previous target position in the lens center 22a as the reference position, the visual field of the fixation target 90 can be improved. There is no need to align the target position with the optical axis OA. For this reason, the guidance time when guiding the fixation position of the eye E to be examined to the optotype position TP can be shortened.

[Effect of ophthalmological device]
FIG. 12 is a flowchart showing the process of examining the eye E to be examined by the ophthalmological apparatus 1 having the above configuration, particularly the process of presenting the fixation target 90 to the eye E (corresponding to the operating method of the ophthalmological apparatus of the present invention).

As shown in FIG. 12, after a predetermined test preparation process is completed in the ophthalmological apparatus 1, the examiner performs an operation on the operation unit 210 to designate the region to be examined on the fundus Ef (step S1). Then, the display control unit 214 of the overall control unit 202 refers to the correspondence information 212 in the storage unit 204 based on the inspection target region specified by the designation operation, and displays the fixation target 90 by the visual target display unit 39. A control method is determined (step S2).

Based on the correspondence information 212, if the target position is the optotype position TM, TCR, TCL, etc. within the lens center portion 22a, the display control unit 214 displays the optotype display unit 39 as described in FIG. Limited control is started (step S3). In this case, the visual target display unit 39 limits the display position of the fixation target 90 to a position corresponding to the target position (display position M, CR, CL, etc.). Thereby, the light beam of the fixation target 90 displayed on the optotype display section 39 is projected onto the eye E from the half mirror 39A via the objective lens 22. As a result, the fixation target 90 is presented to the eye E to be examined (step S4).

When the target position is within the lens center portion 22a, the fixation target 90 is located in the central region of the visual field of the subject, so the eye E to be examined can easily fixate the fixation target 90. Further, in this case, since the fixation target 90 is not moved as in movement control, the fixation position of the eye E to be examined can be quickly guided to the target position.

On the other hand, if the target position is the optotype position TDR, TDL, TP, etc. within the lens peripheral portion 22b based on the correspondence information 212, the display control unit 214 controls the optotype display unit as described in FIG. 39 to start movement control (step S5). First, the display control unit 214 displays the fixation target 90 at the display position M of the visual target display unit 39. As a result, the light flux of the fixation target 90 displayed on the optotype display section 39 is projected from the half mirror 39A to the eye E through the objective lens 22, and is fixed at the reference position corresponding to the optical axis OA of the objective lens 22. The optotype 90 is presented to the eye E to be examined (step S6). As a result, the eye E to be examined can easily fixate the fixation target 90.

Next, the display control unit 214 moves the display position of the fixation target 90 in the visual target display unit 39 from the display position M toward the display position (display position DR, DL, P) corresponding to the target position at a predetermined speed. move it. As a result, the visual target position of the fixation target 90 slowly moves from the reference position toward the target position (step S7). Thereby, the fixation position of the eye E to be examined can be guided from the reference position toward the target position.

At the same time, the display control unit 214 controls the visual target display unit 39 to display a trajectory image 92 of the fixation target 90 moving from the display position M toward the display position corresponding to the target position (step S8). . Thereby, the light beam of the trajectory image 92 is projected onto the eye E from the half mirror 39A via the objective lens 22. As a result, a locus image 92 of the visual target position of the fixation target 90 moving toward the target position is presented to the eye E to be examined, so that the fixation position of the eye E to be examined can be reliably guided toward the target position. Can be done.

Thereafter, the processes of steps S7 and S8 described above are repeatedly executed until the position of the fixation target 90 reaches the target position (step S9). Thereby, the fixation position of the eye E to be examined is guided to the target position.

Further, in parallel with or before or after the processes from step S2 to step S9 described above, the integrated control unit 202 sets the amount of illumination light of the illumination optical system 10 and the observation illumination light of the photographic optical system 30. The light amount is set (step S10). Note that since the method of setting each light amount is a known technique, a detailed explanation will be omitted here.

Next, alignment of the fundus camera unit 2 with respect to the anterior segment Ea and focus adjustment of the fundus camera unit 2 with respect to the fundus Ef are performed automatically under the control of the overall control unit 202 or manually by operation input to the operation unit 210. (Step S11). Then, a captured image and an OCT image of the fundus Ef are captured by the fundus camera unit 2, OCT unit 100, etc. (step S12). It should be noted that each process of steps S11 and S12 is also a known technique, so a detailed explanation thereof will be omitted here.

Hereinafter, when changing the region to be inspected, the processes from step S1 to step S12 described above are repeatedly executed (step S13). Note that, as explained in FIG. 11 described above, when the previous target position is the optotype position TM, TCR, or TCL within the lens center portion 22a, the display control unit 214 In step S6 shown, the fixation target 90 is displayed on the visual target display section 39 using the previous target position as a reference position. Thereby, the guidance time when guiding the fixation position of the eye E to be examined to the target position can be shortened.

[Effects of this embodiment]
As described above, in this embodiment, when the target position corresponding to the region to be inspected is within the lens center section 22a, the optotype display section 39 is caused to execute limited control, and when the target position is within the lens peripheral section 22b. In some cases, the visual target display section 39 can be caused to perform movement control. As a result, when the target position is within the lens center 22a, the fixation position of the eye E is quickly guided to the target position, and conversely, when the target position is within the lens periphery 22b, the eye E is guided quickly to the target position. The fixation position of the user can be reliably guided from the reference position to the target position. As a result, the fixation target 90 can be presented to the eye E in an optimal manner corresponding to the position where the light beam of the fixation target 90 passes through the objective lens 22.

[Ophthalmological apparatus of second embodiment]
FIG. 13 is a schematic diagram showing an example of the configuration of the ophthalmologic apparatus 1 according to the second embodiment. The ophthalmological apparatus 1 of the second embodiment detects the line of sight position on the objective lens 22 that the eye E is gazing at during the movement control described above, and applies the detection result of this line of sight position to the movement control described above. reflect.

As shown in FIG. 13, the ophthalmologic apparatus 1 according to the second embodiment has basically the same configuration as the ophthalmologic apparatus 1 according to the first embodiment, except that the fundus camera unit 2 further includes a line-of-sight position detection optical system 70. It is. For this reason, the same reference numerals are given to the same elements in function or configuration as those in the first embodiment, and the explanation thereof will be omitted.

The line of sight position detection optical system 70 includes a mirror 71, an infrared LED 72, a pinhole 73, a condensing lens 74, a mirror 75, an imaging lens 76, a mirror 77, an image sensor 78, and a semiconductor position detection system. It includes a PSD 79 which is a position sensitive detector.

The mirror 71 is disposed between the previously described dichroic mirror 46 and the objective lens 22, and for example, a dichroic mirror is used. This mirror 71 transmits the aforementioned illumination light, observation illumination light, signal light, etc. (including their reflected light). Further, the mirror 71 reflects near-infrared light incident from a mirror 75 (described later) toward the objective lens 22, and reflects reflected near-infrared light incident from the objective lens 22 toward the mirror 75.

The infrared LED 72 emits near-infrared light toward the pinhole 73. The pinhole 73 converts the near-infrared light incident from the infrared LED 72 into a point light source, and then emits the near-infrared light from the point light source toward the condenser lens 74 . The condensing lens 74 emits the near-infrared light that has entered through the pinhole 73 toward the mirror 75 .

For example, a half mirror is used as the mirror 75. This mirror 75 directs a part of the near-infrared light incident from the condenser lens 74 to the mirror 71 and transmits it as it is. Thereby, the near-infrared light that has passed through the mirror 75 is reflected by the mirror 71 toward the objective lens 22 and enters the eye E through the objective lens 22. Then, the near-infrared light reflected by the subject's eye E enters the mirror 71 through the objective lens 22, and is reflected by the mirror 71 toward the mirror 75. Mirror 75 reflects a portion of the reflected light incident from mirror 71 toward imaging lens 76 .

The imaging lens 76 emits the reflected light incident from the mirror 75 toward the mirror 77 . The mirror 77 reflects a part of the reflected light that has entered from the imaging lens 76 toward the image sensor 78, and allows the rest of the reflected light that has entered from the imaging lens 76 to pass therethrough and output it toward the PSD 79.

The image sensor 78 is a CMOS type or a CCD type, and the reflected light reflected by the mirror 77 forms an image of the eye E on its imaging surface. The image sensor 78 captures an image of the eye E formed on the imaging surface, and outputs captured image data 150 (see FIG. 15) to the overall control unit 202 (see FIG. 14).

The reflected light incident from the mirror 77 is incident on the light receiving surface of the PSD 79 . The PSD 79 is a sensor capable of detecting the light receiving position of reflected light on its light receiving surface, and outputs a light receiving signal indicating the light receiving position to the general control unit 202 (see FIG. 14). Note that a line sensor may be used instead of the PSD 79.

FIG. 14 is a functional block diagram of the arithmetic and control unit 200 of the second embodiment. As shown in FIG. 14, the arithmetic control unit 200 of the second embodiment is different from the arithmetic control unit 200 of the first embodiment, except that the overall control section 202 functions as a line-of-sight position detection section 216 in addition to the display control section 214. The unit 200 has the same configuration.

The line-of-sight position detection section 216 constitutes the line-of-sight position detection section of the present invention together with the already-described line-of-sight position detection optical system 70. The line-of-sight position detection unit 216 turns on the infrared LED 72 in accordance with the movement control start (step S5) shown in FIG. 15) and the light reception signal input from the PSD 79, the line of sight position at which the eye E to be examined is gazing on the objective lens 22 is detected.

FIG. 15 is an explanatory diagram for explaining the gaze position detection method (corneal detection method) of the gaze position detection unit 216 using the Purkinje image 151. As shown by reference numeral XVA in FIG. 15, a Purkinje image 151, which is a reflected image of the near-infrared light, is generated on the corneal surface of the eye E by the incidence of near-infrared light from a point light source. The position of this Purkinje image 151 changes according to a change in the line of sight direction of the eye E to be examined.

Therefore, as shown by reference numeral XVB in FIG. Detect the position coordinates C1 of the Purkinje image 151 at . Then, the line-of-sight position detection unit 216 detects the line-of-sight direction of the eye E to be examined based on the relative position between the position of the Purkinje image 151 indicated by the position coordinate C1 and the center of the pupil. Note that the method of detecting the line-of-sight direction using the Purkinje image 151 is a known technique, and detailed explanation thereof will be omitted. Further, although the PSD 79 is used in this embodiment, the PSD 79 may be omitted and the position coordinate C1 of the Purkinje image 151 may be detected based only on the captured image data 150 input from the image sensor 78.

FIG. 16 is an explanatory diagram for explaining a method (scleral reflection method, dark pupil method) for detecting the line of sight direction of the eye E to be examined based on the captured image data 150 of the eye E to be examined. Note that in this method, the incidence of near-infrared light from a point light source onto the eye E to be examined can be omitted. After acquiring the captured image data 150 of the eye E from the image sensor 78 as indicated by the symbol XVIA in FIG. 150 is binarized using a predetermined brightness threshold. Since the pupil of the eye E to be examined has low luminance compared to the surrounding area, when the captured image data 150 is binarized, the area corresponding to the pupil of the eye E to be examined becomes a black pixel area, and the area around the pupil becomes a black pixel area. becomes the white pixel area. Thereby, the pupil area of the eye E to be examined can be specified from the captured image data 150 of the eye E to be examined.

Then, as shown by reference numeral XVIC in FIG. 16, the line-of-sight position detection unit 216 detects the center coordinate C2 of the pupil area (black pixel area) of the eye E from the binarized captured image data 150 of the eye E. The line of sight direction of the eye E to be examined is detected based on the determined center coordinate C2 and the known geometrical structure of the eyeball. Note that the detection of the line-of-sight direction using the scleral reflex method (dark pupil method) is a known technique, so detailed explanation thereof will be omitted.

Returning to FIG. 14, the line of sight position detection unit 216 detects the line of sight on the objective lens 22 that the eye E is gazing at based on the detected direction of the line of sight of the eye E to be examined and the known photographing magnification of the photographing optical system 30. The position coordinates of the position (point of gaze) are detected, and the detection result of the position coordinates of this gaze position is output to the display control unit 214. Then, the line-of-sight position detection unit 216 repeatedly detects the line-of-sight position of the eye E to be examined at regular intervals, and sequentially outputs the detection result of the positional coordinates of the new line-of-sight position to the display control unit 214.

FIG. 17 is an explanatory diagram for explaining movement control by the display control unit 214 of the second embodiment. As indicated by the reference numeral XVIIA in FIG. Movement from the reference position to the target position and projection of the trajectory image 92 onto the eye E to be examined are executed.

Further, the display control unit 214 of the second embodiment causes the visual target display unit 39 to display the visual line position information 94 indicating the previously described visual line position based on the detection result of the visual line position detecting unit 216. In this case, the display control section 214 functions as an information display control section of the present invention. The luminous flux of the gaze position information 94 displayed on the optotype display unit 39 is projected onto the eye E from the half mirror 39A via the objective lens 22, together with the luminous flux of the fixation target 90 and trajectory image 92 described above. . As a result, the fixation target 90, the trajectory image 92, and the line-of-sight position information 94 are presented to the eye E to be examined.

The line-of-sight position information 94 uses, for example, a symbol such as an arrow indicating the target position. This allows the subject to recognize the amount and direction of deviation between the target position and the line of sight position.

Then, the detection results of new gaze positions are sequentially inputted to the display control section 214 from the gaze position detection section 216. Therefore, as shown by reference numeral XVIIB in FIG. 17, when the line-of-sight position of the eye E to be examined moves toward the target position on the objective lens 22, the line-of-sight position information 94 presented to the eye E to be examined accordingly changes. The location will also be updated. Thereby, the subject can recognize that the line of sight position is approaching the target position. As a result, the fixation position of the eye E to be examined can be reliably guided to the target position.

Further, the display control unit 214 performs a correction to correct a positional deviation between the visual target position of the fixation target 90 on the objective lens 22 and the visual line position on the objective lens 22 based on the detection result of the visual line position detection unit 216. The control may be performed by the visual target display unit 39.

FIG. 18 is an explanatory diagram for explaining correction control by the display control unit 214 of the second embodiment. As shown by symbols XVIIIA and XVIIIB in FIG. 18, the display control section 214 directs the optotype position of the fixation target 90 from the reference position to the target position by controlling the optotype display section 39 during movement control. The trajectory image 92 and the line-of-sight position information 94 are projected onto the eye E to be examined.

At this time, the display control unit 214 detects, based on the detection result of the line-of-sight position detection unit 216, if there is a positional deviation between the visual target position of the fixation target 90 on the objective lens 22 and the line-of-sight position. , executes correction control for decelerating the moving speed of the fixation target 90 on the visual target display section 39 (the moving speed of the visual target position on the objective lens 22). Note that the display control unit 214 increases the amount of deceleration of the moving speed of the fixation target 90 in accordance with the increase in the amount of positional deviation between the visual target position and the line-of-sight position. As a result, the line of sight position of the eye E to be examined can reliably follow the fixation target 90 moving toward the target position, so the fixation position of the eye E to be examined can be reliably guided to the target position. can.

As shown by reference numeral XVIIIC in FIG. The optotype display unit 39 may be corrected and controlled so that the optotype position of the fixation target 90 and the line-of-sight position above match.

Specifically, the display control unit 214 controls, based on the detection result of the line-of-sight position detection unit 216, if there is a positional shift between the visual target position of the fixation target 90 on the objective lens 22 and the line-of-sight position, the display control unit 214 Position control is performed to match the display position of the fixation target 90 within the visual target display section 39 with the line-of-sight position information 94, as indicated by the arrow β in the middle. Thereby, the optotype position of the fixation target 90 on the objective lens 22 and the line-of-sight position can be made to match. Therefore, even if the eye E loses sight of the fixation target 90, it can fixate the fixation target 90 again.

Next, the display control unit 214 controls the optotype display unit 39 to move the optotype position of the fixation target 90 toward the target position again (see arrow α). Thereafter, the display control unit 214 repeatedly performs correction control of the visual target display unit 39 every time the above-described positional shift occurs until the movement control is completed. As a result, the line of sight position of the eye E to be examined can reliably follow the fixation target 90 moving toward the target position, so the fixation position of the eye E to be examined can be reliably guided to the target position. can.

[others]
In the movement control of each embodiment described above, by moving the display position of the fixation target 90 displayed on the optotype display section 39, the target position of the fixation target 90 is moved from the reference position to the target position. However, the target position of the fixation target 90 may be moved from the reference position to the target position by scanning the light beam of the fixation target 90 using an optical scanner. As the optical scanner in this case, in addition to the galvano scanner 42 described above, a resonant scanner, a MEMS (Micro Electro Mechanical Systems) scanner, etc. are used.

In each of the above embodiments, the trajectory image 92 is presented to the eye E to be examined, but the presentation of the trajectory image 92 may be omitted.

The gaze position detection method by the gaze position detection unit 216 of the second embodiment is not limited to the method described above with reference to FIGS. 15 and 16. For example, known gaze positions include methods that use the positional relationship between a reference point such as the inner corner of the examiner's eye and a moving point such as the iris of the eye E to be examined, and a method that detects the movement of the eye E to be examined using an electrooculography sensor. Detection methods can be used.

In each of the embodiments described above, when movement control is performed by the display control unit 214, the target position of the fixation target 90 is moved from the reference position to the target position in a straight line (shortest distance); It may be moved along various non-linear paths such as curved paths.

In each of the above embodiments, the ophthalmological apparatus 1 has been described using a composite device of an optical coherence tomometer and a fundus camera, but an optical coherence tomometer, a fundus camera, a scanning laser ophthalmoscope, a laser treatment device ( The present invention can be applied to various ophthalmological devices that present the fixation target 90 to the eye E, such as a photocoagulator) and a perimeter.

1...Ophthalmological equipment,
2...fundus camera unit,
10...Illumination optical system,
22...Objective lens,
22a...Lens center part,
22b...lens peripheral area,
30...Photographing optical system,
39...Optotype display section,
70... Gaze position detection optical system,
90...Fixation target,
92...Trajectory image,
94... Gaze position information,
200... Arithmetic control unit,
202...General control unit,
210...operation unit,
212...Correspondence information,
214...Display control unit,
216... Gaze position detection unit

Claims (9)

objective lens;
a fixation target display unit that includes an optotype display unit that displays a fixation target, and an optical system that projects a luminous flux of the fixation target displayed on the optotype display unit through the objective lens to the subject's eye;
a position control unit that controls the fixation target presentation unit to control an optotype position that is a position where a light beam of the fixation target passes through the objective lens;
an optotype display control unit that controls display of the fixation target by the optotype display unit;
Equipped with
In the case where the position control unit sets an area within a certain range centered on the optical axis of the objective lens as a lens center part, and sets an area outside the lens center part as a lens peripheral part, When the target position of the optotype position is within the center of the lens, the fixation target presentation section is caused to execute a limitation control that limits the optotype position to the target position, and the target position is within the peripheral area of the lens. In some cases, causing the fixation target presenting unit to perform movement control to move the optotype position from a reference position in the center of the lens to the target position,
The visual target display control unit rotates the fixation target displayed on the visual target display unit with respect to the center of the fixation target, or repeats enlargement and reduction of the fixation target. Changing the display mode of the optotype over time ,
When the position control unit causes the fixation target presentation unit to execute the movement control, the position control unit includes a trajectory display control unit that causes the visual target display unit to display a trajectory image indicating a trajectory of the visual target position,
An ophthalmologic apparatus in which the optical system projects a luminous flux of the locus image displayed on the optotype display unit to the eye to be examined through the objective lens. comprising a line-of-sight position detection unit that detects a line-of-sight position of the eye to be examined in the objective lens;
an information display control unit that causes the visual target display unit to display visual line position information indicating the visual line position based on the detection result of the visual line position detection unit,
The ophthalmologic apparatus according to claim 1, wherein the optical system projects the light flux of the line-of-sight position information displayed on the optotype display unit onto the eye to be examined through the objective lens. objective lens;
a fixation target display unit that includes an optotype display unit that displays a fixation target, and an optical system that projects a luminous flux of the fixation target displayed on the optotype display unit through the objective lens to the subject's eye;
a position control unit that controls the fixation target presentation unit to control an optotype position that is a position where a light beam of the fixation target passes through the objective lens;
an optotype display control unit that controls display of the fixation target by the optotype display unit;
Equipped with
In the case where the position control unit sets an area within a certain range centered on the optical axis of the objective lens as a lens center part, and sets an area outside the lens center part as a lens peripheral part, When the target position of the optotype position is within the center of the lens, the fixation target presentation section is caused to execute a limitation control that limits the optotype position to the target position, and the target position is within the peripheral area of the lens. In some cases, causing the fixation target presenting unit to perform movement control to move the optotype position from a reference position in the center of the lens to the target position,
The visual target display control unit rotates the fixation target displayed on the visual target display unit with respect to the center of the fixation target, or repeats enlargement and reduction of the fixation target. Changing the display mode of the optotype over time,
comprising a line-of-sight position detection unit that detects a line-of-sight position of the eye to be examined in the objective lens;
an information display control unit that causes the visual target display unit to display visual line position information indicating the visual line position based on the detection result of the visual line position detection unit,
An ophthalmological apparatus in which the optical system projects a light beam of the line-of-sight position information displayed on the optotype display unit to the eye to be examined through the objective lens. comprising a line-of-sight position detection unit that detects a line-of-sight position of the eye to be examined in the objective lens;
When the position control unit causes the fixation target presentation unit to execute the movement control, the position control unit performs correction control for correcting a positional deviation of the visual target position with respect to the gaze position based on the detection result of the gaze position detection unit. The ophthalmologic apparatus according to claim 1, wherein the fixation target presentation unit is caused to perform the execution. objective lens;
a fixation target display unit that includes an optotype display unit that displays a fixation target, and an optical system that projects a luminous flux of the fixation target displayed on the optotype display unit through the objective lens to the subject's eye;
a position control unit that controls the fixation target presentation unit to control an optotype position that is a position where a light beam of the fixation target passes through the objective lens;
an optotype display control unit that controls display of the fixation target by the optotype display unit;
Equipped with
In the case where the position control unit sets an area within a certain range centered on the optical axis of the objective lens as a lens center part, and sets an area outside the lens center part as a lens peripheral part, When the target position of the optotype position is within the center of the lens, the fixation target presentation section is caused to execute a limitation control that limits the optotype position to the target position, and the target position is within the peripheral area of the lens. In some cases, causing the fixation target presenting unit to perform movement control to move the optotype position from a reference position in the center of the lens to the target position,
The visual target display control unit rotates the fixation target displayed on the visual target display unit with respect to the center of the fixation target, or repeats enlargement and reduction of the fixation target. Changing the display mode of the optotype over time,
comprising a line-of-sight position detection unit that detects a line-of-sight position of the eye to be examined in the objective lens;
When the position control unit causes the fixation target presentation unit to execute the movement control, the position control unit performs correction control for correcting a positional deviation of the visual target position with respect to the gaze position based on the detection result of the gaze position detection unit. An ophthalmologic apparatus that causes the fixation target presentation unit to perform the operation. 6. The ophthalmologic apparatus according to claim 4, wherein the position control unit causes the fixation target presentation unit to control the moving speed of the target position or control the position of the target position as the correction control. When there are a plurality of target positions, the position control unit causes the fixation target presentation unit to sequentially perform the limitation control or the movement control for each target position,
7. Any one of claims 1 to 6, wherein the position control section sets the target position within the lens center as the reference position when switching the target position from a position within the lens center to a position within the lens periphery. The ophthalmological device according to item 1. objective lens;
a fixation target display unit that includes an optotype display unit that displays a fixation target, and an optical system that projects a luminous flux of the fixation target displayed on the optotype display unit through the objective lens to the subject's eye;
a position control unit that controls the fixation target presentation unit to control an optotype position that is a position where a light beam of the fixation target passes through the objective lens;
an optotype display control unit that controls display of the fixation target by the optotype display unit;
Equipped with
In the case where the position control unit sets an area within a certain range centered on the optical axis of the objective lens as a lens center part, and sets an area outside the lens center part as a lens peripheral part, When the target position of the optotype position is within the center of the lens, the fixation target presentation section is caused to execute a limitation control that limits the optotype position to the target position, and the target position is within the peripheral area of the lens. In some cases, causing the fixation target presenting unit to perform movement control to move the optotype position from a reference position in the center of the lens to the target position,
The visual target display control unit rotates the fixation target displayed on the visual target display unit with respect to the center of the fixation target, or repeats enlargement and reduction of the fixation target. Changing the display mode of the optotype over time,
When there are a plurality of target positions, the position control unit causes the fixation target presentation unit to sequentially perform the limitation control or the movement control for each target position,
An ophthalmological apparatus in which the position control unit sets the target position within the lens center as the reference position when switching the target position from a position within the lens center to a position within the lens periphery. A fixation target presentation unit including an objective lens, an optotype display unit that displays a fixation target, and an optical system that projects a luminous flux of the fixation target displayed on the optotype display unit through the objective lens to the subject's eye. a position control unit that controls the fixation target presenting unit to control the position of the visual target, which is a position at which a light beam of the fixation target passes through the objective lens; In an operating method of an ophthalmologic apparatus, the method includes: an optotype display control unit that controls display of the
In the case where the position control unit sets an area within a certain range centered on the optical axis of the objective lens as a lens center part, and sets an area outside the lens center part as a lens peripheral part, When the target position of the optotype position is within the center of the lens, causing the fixation target presentation unit to perform a limiting control to limit the optotype position to the target position, and when the target position is within the peripheral area of the lens. causing the fixation target presenting unit to perform movement control to move the optotype position from a reference position within the lens center to the target position;
The visual target display control unit rotates the fixation target displayed on the visual target display unit with respect to the center of the fixation target, or repeats enlargement and reduction of the fixation target. Changing the display mode of the optotype over time ,
detecting the line of sight position of the eye to be examined in the objective lens;
When the position control unit causes the fixation target presentation unit to execute the movement control, the position control unit performs correction control for correcting a positional shift of the visual target position with respect to the gaze position based on the detection result of the gaze position. A method of operating an ophthalmological apparatus that is caused to be executed by an optotype presentation unit .

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