JP2020036740A - Ophthalmologic apparatus and method of operating the same - Google Patents

Abstract

An ophthalmologic apparatus that presents a fixation target to an eye to be examined in an optimal manner corresponding to a position where a light flux of the fixation target passes through an objective lens, and an operation method thereof.
A fixation target presenting unit that projects a light flux of a fixation target to an eye to be inspected through an objective lens, and a visual control that controls the fixation target presentation unit so that the light flux of the fixation target passes through the objective lens. A position control unit that controls the target position, wherein the position control unit performs limited control for limiting the target position to the target position when the target position of the target position is within the lens center. When the target position is in the peripheral portion of the lens, the fixation target presenting unit executes the movement control for moving the target position from the reference position in the lens center to the target position.
[Selection diagram] FIG.

Description

  The present invention relates to an ophthalmologic apparatus that presents a fixation target to an eye to be examined and a method of operating the same.

  In an ophthalmic examination (including various actions for acquiring data of an eye to be examined, such as examination, measurement, and photographing, etc.) by an ophthalmologic apparatus, fixation is performed to examine a desired part of the eye to be examined. The fixation is realized by presenting a fixation target to the subject's eye and causing the subject's eye to gaze at the fixation target.

  As fixation, internal fixation is well known (see Patent Document 1 or 2). In internal fixation, a light beam of a fixation target (bright spot image) displayed by a target display unit such as a dot matrix liquid crystal display and a matrix light emitting diode is projected (projected) to an eye to be examined through an objective lens by an optical system. It is a visual system. In this internal fixation, the position where the fixation target is presented to the subject's eye can be set freely.

  For example, when acquiring data on the macula of the fundus, the luminous flux of the fixation target displayed at the display position corresponding to the macula in the target display unit is projected onto the eye to be examined through the lens center of the objective lens by the optical system. Is done. When the subject's eye fixes (fixes) the fixation target, the macula is guided to the examination (imaging) position.

  Further, when acquiring data of the fundus periphery of the fundus, the light flux of the fixation target displayed at a display position corresponding to the periphery of the fundus in the target display unit passes through the lens periphery of the objective lens by the optical system. It is projected on the subject's eye. When the subject's eye fixates on the fixation target, the subject's eye is largely rotated, and the periphery of the fundus is guided to the examination position.

JP 2018-038687 A JP 2017-143919 A

  By the way, when the fixation target is presented to the subject's eye through the lens center of the objective lens as in the examination of the macula, since the fixation target is located in the central region of the visual field range of the subject, the gaze direction of the subject's eye is changed. Fixation guidance to the fixation target is easy. As a result, the subject's eye can easily fixate the fixation target. On the other hand, when the fixation target is presented to the subject's eye through the periphery of the objective lens as in the examination of the periphery of the fundus, the fixation target does not exist in the central region of the visual field range of the subject. The fixation target may be lost, and it is difficult to guide the eye to be examined. Therefore, there is a problem that an 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 such circumstances, and an ophthalmologic apparatus that presents a fixation target to an examinee's eye in an optimal manner corresponding to a position where a light flux of a fixation target passes through an objective lens, and an ophthalmic apparatus therefor. It is intended to provide a method of operation.

  An ophthalmologic apparatus for achieving the object of the present invention projects an objective lens, a target display unit that displays a fixation target, and a light flux of a fixation target displayed on the target display unit through the objective lens to an eye to be examined. A fixation target presenting unit having an optical system, and a position control unit that controls the fixation target presentation unit and controls a target position, which is a position where a light flux of the fixation target passes through the objective lens, The position control unit is configured to determine the target position in a case where an area within a certain range around the optical axis of the objective lens in the objective lens is set as the lens center and an area outside the lens center is set as the lens periphery. When the target position is within the lens center, the fixation target presenting unit executes the limited control for limiting the target position to the target position, and when the target position is within the lens periphery, the target position is set within the lens center. Movement control to move from the reference position to the target position To be executed by the target presentation unit.

  According to this ophthalmologic apparatus, when the target position is within the lens center, the fixation control is performed to quickly guide the fixation position of the subject's eye to the target position, and conversely, when the target position is within the lens peripheral portion. By performing the 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 presenting unit to execute the movement control, the trajectory causing the optotype display unit to display a trajectory image indicating the trajectory of the target position A display control unit is provided, and the optical system projects the light flux of the locus image displayed on the optotype display unit through the objective lens to the eye to be inspected. Thus, the fixation position of the subject's eye can be reliably guided toward the target position.

  An ophthalmologic apparatus according to another aspect of the present invention includes a line-of-sight position detection unit that detects a line-of-sight position of the eye to be inspected in the objective lens, and based on a detection result of the line-of-sight position detection unit, generates line-of-sight position information indicating the line-of-sight position. The optical system includes an information display control unit for displaying on the display unit, and the optical system projects the light flux of the line-of-sight position information displayed on the optotype display unit through the objective lens to the eye to be inspected. Accordingly, the subject can recognize the amount of displacement and the direction of displacement 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 line-of-sight position detection unit that detects a line-of-sight position of the subject's eye in the objective lens, and the position control unit controls the fixation target presentation unit to perform movement control. On the basis of the detection result of the position detection unit, the fixation target presentation unit is caused to execute a correction control for correcting a positional shift of the target position with respect to the line of sight. Thus, the fixation position of the subject's eye 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 presenting unit to execute the control of the moving speed of the target position or the position control of the target position as the correction control.

  In the ophthalmologic apparatus according to another aspect of the present invention, the optotype display control unit controls the display of the fixation target by the optotype display unit, and the display mode of the fixation target to be displayed on the optotype display unit is time. An optotype display control section for causing the optotype display section to change the image or to display a predetermined specific image as a fixation target on the optotype display section. Thereby, the subject's attention can be attracted, so that the subject's eye can be easily guided to the fixation target.

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

  In the ophthalmologic 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 execute the limited control or the movement control in order for each target position, and the position control unit When switching the target position from a position in the lens center to a position in the lens periphery, the target position in the lens center is set as a reference position. Thereby, the guidance time for guiding the fixation position of the subject's eye to the target position can be shortened.

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

  An operation method of an ophthalmologic apparatus for achieving the object of the present invention includes an objective lens, an optotype display unit for displaying a fixation target, and a light flux of the fixation target displayed on the optotype display unit through the objective lens. A fixation target presenting unit having an optical system for projecting to the optometry, and a position control unit that controls the fixation target presenting unit and controls a target position, which is a position where the light flux of the fixation target passes through the objective lens. In the method of operating an ophthalmologic apparatus, the position control unit sets a region within a certain range around the optical axis of the objective lens in the objective lens as a lens center portion, and sets a region outside the lens center portion as a lens peripheral portion. In the case where the target position of the optotype position is within the lens center, the fixation target presenting unit is caused to execute the limited control for restricting the optotype position to the target position, and when the target position is within the lens peripheral portion, Move the target from the reference position in the center of the lens. To perform the movement control of moving to a position in the fixation target presenting unit.

  According to the present invention, the fixation target can be presented to the subject's eye by an optimal method corresponding to the position where the light flux of the fixation target passes through the objective lens.

It is a schematic diagram showing an example of the composition of the ophthalmologic apparatus of a 1st embodiment. FIG. 3 is a functional block diagram of an arithmetic and control unit. FIG. 3 is an explanatory diagram for describing an example of a fixation target presented to an eye to be examined. FIG. 3 is an explanatory diagram for describing an example of a fixation target presented to an eye to be examined. FIG. 3 is an explanatory diagram for describing an example of a fixation target presented to an eye to be examined. FIG. 3 is an explanatory diagram for describing an example of a fixation target presented to an eye to be examined. FIG. 4 is an explanatory diagram showing an example of a relationship between a test target portion of a fundus and a display position of a fixation target on a display surface of a target display unit. FIG. 3 is an enlarged front view of the objective lens as viewed from the subject. FIG. 9 is an explanatory diagram for describing limited control by a display control unit. FIG. 4 is an explanatory diagram for explaining movement control by a display control unit. It is an explanatory view for explaining a modification of the reference position when the movement control is performed by the display control unit. 9 is a flowchart showing the flow of inspection processing of an eye to be inspected by an ophthalmologic apparatus, particularly, processing of presenting a fixation target to the eye to be inspected. It is the schematic which shows an example of a structure of the ophthalmologic apparatus of 2nd Embodiment. It is a functional block diagram of an arithmetic and control unit of a 2nd embodiment. FIG. 7 is an explanatory diagram for describing a gaze position detection method of a gaze position detection unit using a Purkinje image. FIG. 5 is an explanatory diagram for describing a method of detecting a line-of-sight direction of an eye to be inspected E based on captured image data of the eye to be inspected. It is an explanatory view for explaining movement control by a display control unit of a second embodiment. It is an explanatory view for explaining correction control by a display control unit of a second embodiment.

[Ophthalmic apparatus according to first embodiment]
FIG. 1 is a schematic diagram illustrating an example of the configuration of the ophthalmologic apparatus 1 according to the first embodiment. The ophthalmologic apparatus 1 is a multifunction machine combining a fundus camera and an optical coherence tomography that obtains a tomographic image 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 retinal camera unit 2 has almost the same optical system as a conventional retinal camera. The OCT unit 100 is provided with an optical system for acquiring an OCT image of the fundus oculi Ef. The arithmetic control unit 200 is an arithmetic processing device such as a personal computer that executes various arithmetic processes and control processes.

[Fundus camera unit]
The fundus camera unit 2 includes an illumination optical system 10 and a photographing optical system 30 as an optical system for acquiring a two-dimensional image (fundus image) representing the surface morphology of the fundus oculi Ef of the eye E to be inspected. The illumination optical system 10 emits illumination light to the fundus oculi Ef. The imaging optical system 30 guides the fundus reflection light of the illumination light reflected by the fundus oculi Ef to image sensors 35 and 38 of a complementary metal oxide semiconductor (CMOS) type or a charge coupled device (CCD) type. Further, the imaging optical system 30 guides the signal light output from the OCT unit 100 to the fundus oculi Ef, and guides the signal light having passed through the fundus oculi Ef to the OCT unit 100.

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

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

  As the observation light source 11, for example, a halogen lamp or an LED (Light Emitting Diode) light source is used, 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 condenser lens 13, passes through the visible cut filter 14, and becomes near-infrared light. Further, the observation illumination light once converges near the imaging light source 15, is reflected by the mirror 16, and passes through the relay lenses 17 and 18, the diaphragm 19, and the relay lens 20. Then, 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 reflection light of the observation illumination light is refracted by the objective lens 22, passes through the dichroic mirror 46, passes through a hole formed in the central area of the aperture mirror 21, passes through the dichroic mirror 55, and passes through the focusing lens The light is reflected by the mirror 32 via the mirror 31. Further, the fundus reflected light passes through the half mirror 39A, is reflected by the dichroic mirror 33, and is imaged on the light receiving surface of the image sensor 35 by the condenser lens. The image sensor 35 captures (receives) fundus reflected light and outputs a captured signal. The display device 3 displays an observation image based on the imaging signal output from the image sensor 35. When the focus of the photographing optical system 30 is adjusted to the anterior segment Ea of the eye E, the observation image of the anterior segment Ea is displayed on the display device 3, and the focus of the photographing optical system 30 is adjusted to the fundus Ef. If the adjustment has been made, an observation image of the fundus oculi Ef is displayed on the display device 3.

  As the imaging light source 15, for example, a xenon lamp or an LED light source is used, and emits imaging illumination light. The imaging illumination light emitted from the imaging light source 15 is applied to the fundus oculi Ef through the same route as the observation illumination light described above. The fundus reflection light of the photographing illumination light is guided to the dichroic mirror 33 through the same path as the fundus reflection light of the observation illumination light, passes through the dichroic mirror 33, is reflected by the mirror 36, and is condensed by the image sensor 37 by the condenser lens 37. An image is formed on the light receiving surface of the light-receiving element.

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

  As the optotype display unit 39, for example, various display devices (devices) such as a dot matrix liquid crystal display (LCD) and a matrix light emitting diode (LED) are used. The optotype display section 39 displays a fixation target 90. Further, since the optotype display section 39 is a dot matrix LCD or the like, the display mode (shape and the like) and the display position of the fixation target 90 can be set arbitrarily. In addition, the optotype display section 39 can display an optotype for visual acuity measurement in addition to the fixation target 90.

  After a part of the light flux of the fixation target 90 displayed on the target display unit 39 is reflected by the half mirror 39A, the mirror 32, the focusing lens 31, the dichroic mirror 55, and the aperture of the apertured mirror 21 are opened. Is projected onto the eye E through the dichroic mirror 46 and the objective lens 22. Thus, the fixation target 90 and the visual acuity measurement target can be presented to the eye E to be examined. The above-described half mirror 39A to the objective lens 22 correspond to the optical system of the present invention. Therefore, in the present embodiment, a part of the photographing optical system 30 functions as the fixation target presenting unit of the present invention.

  Further, the retinal camera unit 2 includes an alignment optical system 50 and a focus optical system 60 as in the conventional retinal camera. The alignment optical system 50 generates an alignment index for performing positioning (alignment) of the fundus camera unit 2 with respect to the eye E. The focus optical system 60 generates a split index for focusing on the fundus oculi Ef.

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

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

  The corneal reflection light of the alignment light passes through the objective lens 22, the dichroic mirror 46, and the hole of the perforated mirror 21, and after a part of the light passes through the dichroic mirror 55, the focusing lens 31, the mirror 32, and the half mirror The light enters the light receiving surface of the image sensor 35 via the dichroic mirror 33A and the condenser lens 34.

  The image sensor 35 captures (receives) corneal reflection light of the alignment light and outputs an imaging signal. As a result, the alignment index is displayed on the display device 3 together with the above-described observation image of the anterior segment Ea. Then, the user performs the alignment by performing the same operation as the conventional fundus camera. The arithmetic control unit 200 may perform alignment (auto alignment) by analyzing the position of the alignment index and moving the optical system.

  The reflection surface of the reflection bar 67 is set on the optical path of the illumination optical system 10 when the focus adjustment by the focus optical system 60 is performed. Focus light emitted from the LED 61 passes through a relay lens 62 and is split into two light beams by a split indicator plate 63, and then reflected by a reflecting rod 67 via a two-hole aperture 64, a mirror 65, and a condenser lens 66. The image is once formed on the surface, and is reflected toward the relay lens 20 on this reflecting surface. Further, the focus light is projected on the fundus Ef via the relay lens 20, the aperture mirror 21, the dichroic mirror 46, and the objective lens 22.

  The fundus reflection light of the focus light is imaged by the image sensor 35 through the same path as the corneal reflection light of the alignment light. The image sensor 35 images the fundus reflection light of the focus light and outputs an imaging signal. Thereby, the split index is displayed on the display device 3 together with the observation image. An arithmetic and control unit 200, which will be described later, analyzes the position of the split index, moves the focusing lens 31 and the like, and automatically performs focusing, as in the related art. Alternatively, the user may manually focus while visually checking the split index.

  The dichroic mirror 46 branches an optical path for OCT measurement from an optical path for fundus imaging. The dichroic mirror 46 reflects light in a wavelength band used for OCT measurement and transmits light for fundus imaging. In the optical path for OCT measurement, a collimator lens unit 40, an optical path length changing unit 41, a galvano scanner 42, a focusing lens 43, a mirror 44, and a relay lens 45 are sequentially provided from the OCT unit 100 side. 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. The change of the optical path length is used for correcting the optical path length according to the axial length of the eye E, 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 oculi Ef can be scanned with the signal light. The galvano scanner 42 includes, for example, a galvanomirror that scans the signal light in the X direction, a galvanomirror that scans the signal light in the Y direction, and a mechanism that independently drives these. Thus, the signal light can be scanned in any direction on the XY plane.

  The fundus camera unit 2 is provided with two anterior eye cameras 300. Each anterior segment camera 300 photographs the anterior segment Ea substantially simultaneously from different directions. Further, each anterior eye camera 300 is provided at a position deviated from the optical path of the illumination optical system 10 and the optical path of the imaging optical system 30. Then, each anterior eye camera 300 acquires a captured image of the subject's eye E in a state where the subject's eye E is at substantially the same position (direction). Each captured image is used by the arithmetic and control unit 200 for analyzing the three-dimensional position of the characteristic portion of the eye E to be inspected.

[OCT unit]
The OCT unit 100 includes an optical system used for acquiring an OCT image of the fundus oculi Ef. This optical system has the same configuration as a conventional OCT device. That is, the optical system divides the low coherence light into the reference light and the signal light, and causes the signal light passing through the fundus oculi Ef and the reference light passing through the reference optical path to interfere with each other to generate interference light. Detect spectral components. This detection result (detection signal) is output from the OCT unit 100 to the arithmetic and control unit 200. Since the specific configuration of the optical system of the OCT unit 100 is a known technique (for example, see Patent Documents 1 and 2), a specific description will be omitted here.

[Operation control unit]
FIG. 2 is a functional block diagram of the arithmetic and control unit 200. As shown in FIG. 2, the arithmetic and control unit 200 includes an overall control unit 202, a storage unit 204, an image forming unit 206, a data processing unit 208, and the like. In the present embodiment, what is described as “—unit” in the arithmetic and control unit 200 may be “—circuit”, “—device”, or “—device”. That is, what is described as the “unit” may be configured by firmware, software, hardware, or a combination thereof. An operation unit 210 is connected to the arithmetic and control unit 200 in addition to the components of the fundus camera unit 2, the display device 3, and the OCT unit 100. The operation unit 210 is a known operation device such as an operation lever, a keyboard, a mouse, and a touch panel type monitor, and receives various input operations by the examiner.

  The general control unit 202 generally controls the operations of the respective units of the fundus camera unit 2, the display device 3, and the OCT unit 100 in accordance with an input operation performed by the examiner on the operation unit 210. In FIG. 2, only functions related to display control of the fixation target 90 among various functions of the general control unit 202 are illustrated, and other functions are well-known technologies, and thus specific illustration is omitted.

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

  The storage unit 204 stores image data of an OCT image, image data of a fundus image, eye information (including subject information), and the like, in addition to a control program executed by the processor of the overall control unit 202. Further, the storage unit 204 stores correspondence information 212 described later in detail.

  The image forming unit 206 analyzes the detection signal input from the OCT unit 100 and forms an OCT image of the fundus oculi Ef. 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 eye image) acquired by the fundus camera unit 2 described above.

[Presentation (display) control of fixation target]
When presenting the fixation target 90 to the subject's eye E, the overall control unit 202 functions as the display control unit 214 by executing the control program read from the storage unit 204. The display control unit 214 corresponds to the position control unit, the trajectory display control unit, and the optotype display control unit of the present invention.

  FIGS. 3 to 6 are explanatory diagrams illustrating an example of the fixation target 90 displayed on the target display unit 39 by the display control unit 214, that is, the fixation target 90 presented to the eye E to be examined. Here, the display control unit 214 functions as the optotype display control unit of the present invention.

  As shown in FIGS. 3 to 5, the display control unit 214 temporally changes the display mode of the fixation target 90 when the fixation target 90 is displayed on the target display unit 39. For example, as illustrated in FIG. 3, the display control unit 214 causes the optotype display unit 39 to display the fixation target 90 that rotates (rotates) with respect to the center of the optotype 90. Further, as shown in FIG. 4, the display control unit 214 causes the optotype display unit 39 to display a fixation target 90 that repeats enlargement and reduction. Further, as illustrated in FIG. 5, the display control unit 214 causes the optotype display unit 39 to display the fixation target 90 including the rotating numbers and the display mode in which the numbers are switched as time passes. Display. In this way, by changing the display mode of the fixation target 90 displayed on the target display unit 39 with time, the subject's attention can be drawn. This makes it easier to guide the eye E to the fixation target 90.

  As illustrated in FIG. 6, the display control unit 214 may cause the optotype display unit 39 to display a predetermined specific image (animal, vehicle, character appearing in fiction, and the like) as the fixation target 90. . Also in this case, since the subject's attention can be attracted, the eye E can be easily guided 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 an operation of designating a target part of the examination (imaging) of the fundus oculi Ef input by the examiner to the operation unit 210. Then, the display control unit 214 controls the display position of the fixation target 90 displayed on the target display unit 39, thereby changing the target position where the light flux of the fixation target 90 passes through the objective lens 22. The control is performed in a direction perpendicular to the optical axis OA of the objective lens 22 (see FIG. 8) (XY directions: see FIG. 1). That is, the presentation position of the fixation target 90 to be presented to the subject's eye E to the display control unit 214 is controlled in the above-described vertical direction. Hereinafter, the position where the light flux of the fixation target 90 displayed on the target display unit 39 at the display position corresponding to the above-described designation operation passes through the objective lens 22 is referred to as a “target position”.

  FIG. 7 is an explanatory diagram showing an example of the relationship between the examination target site of the fundus oculi Ef and the display position of the fixation target 90 on the display surface of the target display unit 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 oculi Ef of both eyes of the subject's eye E. The display position M corresponds to the position of the optical axis OA (see FIG. 8) of the objective lens 22. That is, the light flux 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” indicates the display position of the fixation target 90 corresponding to the center of the fundus Ef of the fundus oculi Ef of the right eye of the eye E to be examined, and the symbol “CL” indicates the center of the fundus Ef of the fundus Ef of the left eye of the eye E to be examined. 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 oculi Ef of the right eye of the eye E to be examined, and the symbol “DL” is the optic disc of the fundus oculi Ef of the left eye of the eye E to be examined. The display position of the corresponding fixation target 90. Symbols “P” are display positions of the fixation target 90 corresponding to eight positions around the fundus oculi of the fundus oculi Ef of both eyes of the eye E to be examined.

  The display position of the fixation target 90 displayed on the target display unit 39 is not limited to the position shown in FIG. 7 and may be changed as appropriate. Further, a display position corresponding to another examination target site (for example, an intermediate position between the macula and the optic disc) may be added.

  The luminous flux of the fixation target 90 displayed on the target display unit 39 is projected from the half mirror 39A through the dichroic mirror 46 to the eye E through the objective lens 22 as described above. Thus, the fixation target 90 can be presented to the subject's eye E and the fixation target 90 can be fixed to the subject's eye E.

  FIG. 8 is an enlarged front view of the objective lens 22 viewed from the subject. 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 target display unit 39 is converted into a target position TM in a later-described lens center portion 22a of the objective lens 22. (Corresponding to the optical axis OA) and projected onto the eye E to be examined. As a result, the eye E (right eye and left eye) fixes the fixation target 90 on the target position TM, so that the fundus Ef is located at the irradiation position (scan position) of the signal light emitted from the OCT unit 100. The macula is moved.

  The luminous flux of the fixation target 90 displayed at the display position CR of the target display unit 39 is projected to the eye E through the target position TCR in the lens center 22a. The luminous flux of the fixation target 90 displayed at the display position CL of the target display unit 39 is projected onto the eye E through the target position TCL in the lens center 22a. Thereby, the right eye of the subject's eye E fixes the fixation target 90 at the target position TCR, or the left eye fixes the fixation target 90 at the target position TCL, thereby forming a fundus. The fundus center of Ef is moved to the above-mentioned signal light irradiation position.

  The luminous flux of the fixation target 90 displayed at the display position DR of the target display unit 39 is projected onto the eye E through a target position TDR in a later-described lens peripheral portion 22b of the objective lens 22. The luminous flux of the fixation target 90 displayed at the display position DL of the target display unit 39 is projected to the eye E through the target position TDL in the lens peripheral part 22b. Thereby, the right eye of the subject's eye E fixes the fixation target 90 on the target position TDR, or the left eye fixes the fixation target 90 on the target position TDL, thereby forming a fundus. The optic disc of Ef is moved to the above-described signal light irradiation position.

  The luminous flux of the fixation target 90 displayed at each display position P of the target display unit 39 is projected to the eye E through each target position TP in the lens peripheral portion 22b. As a result, the subject's eye E (the right eye and the left eye) fixes the fixation target 90 on any one of the target positions TP of the respective target positions TP, and thereby the eight peripheral portions of the fundus oculi Ef around the fundus Is moved to the above-described signal light irradiation position.

  The lens center portion 22a is a region within a certain range centered on the optical axis OA of the objective lens 22, and includes the target position TM and the target positions TCR and TCL described above in the present embodiment. Here, when the subject's eye E fixes the fixation target 90 that has passed through the target position TM and the target positions TCR and TCL of the objective lens 22, the fixation target 90 is positioned at the center of the visual field range of the subject. Since the eye E is located in the region, it is not necessary to rotate the eye E to a large extent. Therefore, the subject's eye E can be easily guided to the fixation target 90. Therefore, the lens center portion 22 a is an area in the objective lens 22 where the eye E can be easily guided to the fixation target 90.

  The lens center portion 22a is not limited to the range shown in FIG. 4 in the objective lens 22, but is a range including only the target position TM or a range including the target positions TDR and TDL. Alternatively, the range may include a target position corresponding to another examination target site (eg, an intermediate position between the macula and the optic disc) of the fundus oculi Ef.

  The lens peripheral portion 22b is a region outside the above-described lens center portion 22a in the objective lens 22, and includes the above-described target positions TDR, TDL and the target position TP in the present embodiment. Here, when the subject's eye E fixes the fixation target 90 that has passed through the target positions TDR, TDL and the target position TP of the objective lens 22, the fixation target 90 is positioned at the center of the visual field range of the subject. Since the eye E does not exist in the region, it is necessary to largely rotate the eye E to be examined. For this reason, the eye E may lose sight of the fixation target 90, and it is difficult to guide the eye E to the fixation target 90.

  Therefore, the display control unit 214 determines whether the target position (the target positions TP, TCR,... TP) corresponding to the inspection target part is within the lens center part 22a or the lens peripheral part 22b. The display control method of the fixation target 90 by the target display unit 39 is switched. Thus, the position control method of the target position of the fixation target 90 differs depending on whether the target position is inside the lens center part 22a or inside the lens peripheral part 22b.

  At this time, the storage unit 204 shown in FIG. 3 described above stores the correspondence between the plurality of test target sites and the display control method of the fixation target 90 by the target display unit 39 for each test target site. The stored correspondence information 212 is stored. The display control method of the fixation target 90 includes limited control corresponding to a target position (target position TM, TCR, TCL) in the lens center portion 22a, and a target position (target position TDR, target position) in the lens peripheral portion 22b. TDL, TP).

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

  FIG. 9 is an explanatory diagram for describing the limited control by the display control unit 214. In the example illustrated in FIG. 9, it is assumed that the fundus center of the fundus oculi Ef of the eye E (right eye) to be inspected is specified.

  As illustrated in FIG. 9, when the target position is the target position TCR, the display control unit 214 performs the limited control corresponding to the target position TCR in the lens center 22a based on the correspondence information 212. 39. In this case, the display control unit 214 controls the optotype display unit 39 such 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 in the target display unit 39 to the display position CR. Thus, unlike the movement control described later, the fixation target 90 can be promptly presented to the subject's eye E.

  FIG. 10 is an explanatory diagram for explaining movement control by the display control unit 214. In the example illustrated in FIG. 10, it is assumed that one portion of the fundus oculi peripheral portion of the fundus oculi Ef of the eye E (either the right eye or the left eye) is specified as the inspection target site. In this case, the display control unit 214 functions as the position control unit of the present invention.

  As indicated by reference numeral XA in FIG. 10, when the target position is the target position TP, the display control unit 214 checks the movement control corresponding to the target position TP in the lens peripheral part 22b based on the correspondence information 212. The mark display section 39 is caused to execute the processing. First, the display control unit 214 displays the fixation target 90 on the target display unit 39 such that the position of the target of the fixation target 90 matches a predetermined reference position in the lens center portion 22a (including substantially matching). Display. Here, the reference position in the present 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 target display unit 39. Thereby, the fixation target 90 is located in the central region of the visual field range of the subject, so that the subject's eye E can easily fixate on the fixation target 90.

  Next, the display control unit 214 moves the optotype position of the fixation target 90 from the reference position to the target position (here, the optotype position TP) specified by the specifying operation, as indicated by the arrow α in the drawing. The display control of the optotype display unit 39 is performed so that The arrow α indicates the direction in which the fixation target 90 moves, and the arrow α may or may not actually be displayed on the target display unit 39.

  Specifically, the display control unit 214 moves the display position of the fixation target 90 in the target display unit 39 from the display position M to 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 does not lose sight of the fixation target 90. Thereby, as shown by the symbol XB in FIG. 10, the optotype position of the fixation target 90 slowly moves from the reference position (optical axis OA) to the target position (optotype position TP). The fixation position can be guided from the reference position to the target position.

  In addition, when causing the optotype display unit 39 to perform the above-described movement control, the display control unit 214 moves from the display position M corresponding to the reference position to the display position P corresponding to the target position. A track image 92 of 90 is displayed on the optotype display unit 39. In this case, the display control unit 214 functions as a locus display control unit of the present invention.

  The luminous flux of the trajectory image 92 displayed on the optotype display unit 39 is projected onto the eye E through the objective lens 22 from the half mirror 39A together with the luminous flux of the fixation target 90. As a result, a trajectory image 92 indicating the trajectory of the target position of the fixation target 90 moving from the reference position to the target position (target position TP) on the objective lens 22 is presented to the eye E. Thus, the fixation position of the eye E can be reliably guided from the reference position to the target position TP.

  As described above, when the target position specified by the specifying operation on the operation unit 210 is within the lens center 22a, the display control unit 214 causes the optotype display unit 39 to execute the limited control, and the target position is When it is within the section 22b, the optotype display section 39 executes the movement control.

  In the OCT examination of the eye E, a plurality of target positions may be sequentially presented to the eye E. In this case, for each of the plurality of target positions specified by the specifying operation on the operation unit 210, the display control unit 214 performs the limitation control or the limited control according to whether the target position is within the lens center part 22a or the lens peripheral part 22b. The movement control is performed by the optotype display unit 39 in order.

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

  As shown in FIG. 11, the display control unit 214 sets the target position immediately before, that is, the target position TCR in the lens center 22a as a reference position, and changes the target position of the fixation target 90 from this reference position. The optotype display unit 39 executes the movement control for moving the target to the target position.

  When the target position is switched from the position in the lens central portion 22a to the position in the lens peripheral portion 22b as described above, the target position in the lens central portion 22a is set as the reference position, so that the fixation target 90 is viewed. There is no need to align the target position with the optical axis OA. For this reason, the guidance time for guiding the fixation position of the eye E to the target position TP can be reduced.

[Operation of ophthalmic device]
FIG. 12 is a flowchart showing a flow of inspection processing of the eye E to be inspected by the ophthalmologic apparatus 1 having the above configuration, in particular, processing of presenting the fixation target 90 to the eye E (corresponding to an operation method of the ophthalmologic apparatus of the present invention).

  As shown in FIG. 12, after the predetermined examination preparation processing in the ophthalmologic apparatus 1 is completed, the examiner performs an operation of designating the examination target site of the fundus oculi Ef on the operation unit 210 (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 part specified by the specifying operation, and displays the fixation target 90 by the target display unit 39. The control method is determined (Step S2).

  Based on the correspondence information 212, when the target position is the target position TM, TCR, TCL, or the like in the lens center 22a, the display control unit 214 transmits the target position to the target display unit 39 as described with reference to FIG. The limited control is started (step S3). In this case, the optotype display unit 39 limits the display position of the fixation target 90 to a position (display position M, CR, CL, or the like) corresponding to the target position. Thereby, the light flux of the fixation target 90 displayed on the target display unit 39 is projected from the half mirror 39A to the eye E via the objective lens 22. As a result, the fixation target 90 is presented to the eye E (step S4).

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

  On the other hand, when the target position is the target position TDR, TDL, TP, or the like in the lens peripheral portion 22b based on the correspondence information 212, the display control unit 214, as described with reference to FIG. The movement control is started by 39 (step S5). First, the display control unit 214 causes the fixation target 90 to be displayed at the display position M of the target display unit 39. Accordingly, the light flux of the fixation target 90 displayed on the target display unit 39 is projected from the half mirror 39A through the objective lens 22 to the subject's eye E, and fixed at a reference position corresponding to the optical axis OA of the objective lens 22. The optotype 90 is presented to the eye E (step S6). As a result, the subject's eye E can easily fixate on the fixation target 90.

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

  At the same time, the display control unit 214 controls the target display unit 39 to display the trajectory image 92 of the fixation target 90 moving from the display position M to the display position corresponding to the target position (step S8). . Thereby, the light beam of the trajectory image 92 is projected from the half mirror 39A to the eye E through the objective lens 22. As a result, since the trajectory image 92 of the target position of the fixation target 90 moving toward the target position is presented to the eye E, it is possible to reliably guide the fixation position of the eye E toward the target position. Can be.

  Hereinafter, until the target position of the fixation target 90 reaches the target position, the processing of the above-described steps S7 and S8 is repeatedly executed (step S9). Thereby, the fixation position of the eye E is guided to the target position.

  Further, in parallel with or before or after the processing from step S2 to step S9 described above, the general control unit 202 sets the amount of illumination light of the illumination optical system 10 and sets the amount of observation illumination light of the imaging optical system 30. The light amount is set (step S10). In addition, since the setting method of each light quantity is a well-known technique, a specific description is omitted here.

  Next, the alignment of the fundus camera unit 2 with respect to the anterior ocular segment Ea and the focus adjustment of the fundus camera unit 2 with respect to the fundus oculi Ef are automatically executed under the control of the general control unit 202, or are manually performed by an operation input to the operation unit 210. (Step S11). Then, a photographed image of the fundus oculi Ef and an OCT image are photographed by the fundus camera unit 2 and the OCT unit 100 (step S12). In addition, since each process of steps S11 and S12 is a known technique, a specific description is omitted here.

  Hereinafter, when changing the inspection target site, the above-described processes from step S1 to step S12 are repeatedly executed (step S13). Note that, as described in FIG. 11 described above, when the immediately preceding target position is the target positions TM, TCR, and TCL in the lens center 22a, the display control unit 214 returns to FIG. In the illustrated step S6, the fixation target 90 is displayed on the target display unit 39 with the previous target position as a reference position. Thereby, the guidance time for guiding the fixation position of the eye E to the target position can be shortened.

[Effects of the present embodiment]
As described above, in the present embodiment, when the target position corresponding to the inspection target site is within the lens center portion 22a, the optotype display unit 39 performs the limited control, and the target position is set within the lens peripheral portion 22b. In some cases, the optotype display unit 39 can execute the movement control. Accordingly, when the target position is within the lens center portion 22a, the fixation position of the eye E is quickly guided to the target position, and when the target position is within the lens peripheral portion 22b, the eye E is quickly detected. 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 by an optimal method corresponding to the position at which the light flux of the fixation target 90 passes through the objective lens 22.

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

  As shown in FIG. 13, the configuration of the ophthalmologic apparatus 1 of the second embodiment is basically the same as that of the ophthalmologic apparatus 1 of the above-described first embodiment except that the fundus camera unit 2 further includes a line-of-sight position detecting optical system 70. It is. Therefore, the same components as those in the first embodiment in function or configuration are denoted by the same reference numerals, and description thereof is omitted.

  The line-of-sight position detection optical system 70 includes a mirror 71, an infrared LED 72, a pinhole 73, a condenser lens 74, a mirror 75, an imaging lens 76, a mirror 77, an image sensor 78, and semiconductor position detection. A PSD 79 which is an element (Position Sensitive Detector).

  The mirror 71 is disposed between the dichroic mirror 46 and the objective lens 22 described above, and for example, a dichroic mirror is used. The mirror 71 transmits the above-described illumination light, observation illumination light, signal light, and the like (including the reflected light). The mirror 71 reflects near-infrared light incident from a mirror 75 described later toward the objective lens 22, and reflects reflected light of 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 uses the near-infrared light incident from the infrared LED 72 as a point light source, and emits the near-infrared light of the point light source toward the condenser lens 74. The condenser lens 74 emits near-infrared light incident from the pinhole 73 toward the mirror 75.

  As the mirror 75, for example, a half mirror is used. The mirror 75 transmits part of the near-infrared light incident from the condenser lens 74 toward the mirror 71 as it is. Thus, the near-infrared light transmitted 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 reflected light of the near-infrared light reflected by the eye E enters the mirror 71 through the objective lens 22, and is reflected toward the mirror 75 by the mirror 71. The mirror 75 reflects a part of the reflected light incident from the mirror 71 toward the imaging lens 76.

  The imaging lens 76 emits the reflected light from the mirror 75 toward the mirror 77. The mirror 77 reflects a part of the reflected light incident from the imaging lens 76 toward the image sensor 78, and transmits the rest of the reflected light incident from the imaging lens 76 as it is and emits it toward the PSD 79.

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

  The reflected light 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 the reflected light on the light receiving surface, and outputs a light receiving signal indicating the light receiving position to the overall 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 according to the second embodiment. As shown in FIG. 14, the arithmetic and control unit 200 according to the second embodiment is different from the arithmetic and control unit according to the first embodiment except that the general control unit 202 functions as the line-of-sight position detection unit 216 in addition to the display control unit 214. This is the same configuration of the unit 200.

  The line-of-sight position detection unit 216 forms a line-of-sight position detection unit of the present invention together with the line-of-sight position detection optical system 70 described above. 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. 12 described above, and captures image data 150 (see FIG. 15) and the light receiving signal input from the PSD 79, the gaze position at which the eye E is gazing on the objective lens 22 is detected.

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

  Therefore, as indicated by reference numeral XVB in FIG. 15, the gaze position detection unit 216 determines the eye E based on the captured image data 150 of the eye E input from the image sensor 78 and the light receiving signal input from the PSD 79. Of the Purkinje image 151 are detected. Then, the line-of-sight position detection unit 216 detects the line-of-sight direction of the eye E based on the relative position between the position of the Purkinje image 151 indicated by the position coordinates C1 and the center of the pupil. The method of detecting the line of sight direction using the Purkinje image 151 is a known technique, and a detailed description thereof will be omitted. Although the PSD 79 is used in the present embodiment, the PSD 79 may be omitted and the position coordinates 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 describing a method (scleral reflection method, dark pupil method) of detecting the gaze direction of the eye E based on the captured image data 150 of the eye E. In this method, the incidence of near-infrared light from the point light source on the eye E can be omitted. The line-of-sight position detection unit 216 acquires the captured image data 150 of the eye E from the image sensor 78 as shown by the symbol XVIA in FIG. 16 and then captures the captured image data of the eye E as shown by the symbol XVIB in FIG. 150 is binarized at a predetermined luminance threshold. Since the pupil of the eye E has a lower luminance than the surrounding area, when the captured image data 150 is binarized, the area corresponding to the pupil of the eye E becomes a black pixel area, and the area around the pupil becomes black. Is a white pixel area. Thus, the pupil region of the eye E can be specified from the captured image data 150 of the eye E.

  Then, as indicated by reference numeral XVIC in FIG. 16, the gaze position detection unit 216 calculates the center coordinates C2 of the pupil region (black pixel region) of the eye E from the binarized captured image data 150 of the eye E. The gaze direction of the eye E is detected based on the calculated center coordinates C2 and the known geometric structure of the eyeball. Note that detection of the direction of the line of sight by the scleral reflection method (dark pupil method) is a known technique, and a detailed description thereof will be omitted.

  Returning to FIG. 14, the line-of-sight position detection unit 216 determines the line of sight on the objective lens 22 that the eye E is gazing at based on the detected line-of-sight direction of the eye E and the known magnification of the imaging optical system 30. The position coordinates of the position (gaze point) are detected, and the detection result of the position coordinates of the line-of-sight position is output to the display control unit 214. Then, the line-of-sight position detection unit 216 repeatedly performs the detection of the line-of-sight position of the eye E at regular intervals, and sequentially outputs the detection results of the position 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 according to the second embodiment. As indicated by reference numeral XVIIA in FIG. 17, the display control unit 214 of the second embodiment controls the optotype display unit 39 in the same manner as in the above-described first embodiment, and controls the optotype position of the fixation target 90. The movement from the reference position to the target position and the projection of the trajectory image 92 to the eye E 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 visual line position described above, based on the detection result of the visual line position detection unit 216. In this case, the display control unit 214 functions as the information display control unit of the present invention. The luminous flux of the line-of-sight position information 94 displayed on the optotype display unit 39 is projected from the half mirror 39A via the objective lens 22 to the eye E together with the luminous flux of the fixation target 90 and the trajectory image 92 described above. . Thus, the fixation target 90, the trajectory image 92, and the line-of-sight position information 94 are presented to the subject's eye E.

  As the line-of-sight position information 94, for example, a symbol such as an arrow indicating a target position is used. Thus, the subject can recognize the amount of displacement and the direction of displacement between the target position and the line-of-sight position.

  Then, the detection result of the new gaze position is sequentially input to the display control unit 214 from the gaze position detection unit 216. For this reason, as indicated by reference numeral XVIIB in FIG. 17, when the line-of-sight position of the subject's eye E on the objective lens 22 moves toward the target position, the line-of-sight position information 94 presented to the subject's eye E accordingly. The position is also updated. This allows the subject to recognize that the line of sight is approaching the target position. As a result, the fixation position of the eye E can be reliably guided to the target position.

  Further, the display control unit 214 corrects the 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 optotype display unit 39.

  FIG. 18 is an explanatory diagram for describing correction control by the display control unit 214 according to the second embodiment. As indicated by reference numerals XVIIIA and XVIIIB in FIG. 18, the display control unit 214 controls the optotype display unit 39 at the time of movement control so that the optotype position of the fixation target 90 is shifted from the reference position to the target position. And the projection of the trajectory image 92 and the line-of-sight position information 94 onto the eye E to be inspected is executed.

  At this time, based on the detection result of the line-of-sight position detection unit 216, the display control unit 214 determines whether or not a positional shift has occurred between the target position of the fixation target 90 and the line-of-sight position on the objective lens 22. Then, correction control is performed to reduce the moving speed of the fixation target 90 on the optotype display unit 39 (movement speed of the optotype position on the objective lens 22). In addition, 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 displacement between the target position and the line-of-sight position. This allows the gaze position of the eye E to be surely followed by the fixation target 90 moving toward the target position, so that the fixation position of the eye E can be reliably guided to the target position. it can.

  As indicated by reference numeral XVIIIC in FIG. 18, the display control unit 214 performs, instead of or in addition to slowing down the moving speed of the fixation target 90, the objective lens 22 based on the detection result of the gaze position detecting unit 216. 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 match.

  Specifically, based on the detection result of the line-of-sight position detection unit 216, the display control unit 214 determines whether or not a positional shift has occurred between the target position of the fixation target 90 and the line-of-sight position on the objective lens 22. As indicated by an arrow β in the middle, position control is performed so that the display position of the fixation target 90 in the target display unit 39 matches the line-of-sight position information 94. Thereby, the target position of the fixation target 90 on the objective lens 22 and the line-of-sight position can be matched. For this reason, even if the eye E loses sight of the fixation target 90, the fixation target 90 can be fixed 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 the arrow α). Hereinafter, the display control unit 214 repeatedly executes the correction control of the optotype display unit 39 every time the above-described displacement occurs until the movement control is completed. This allows the gaze position of the eye E to be surely followed by the fixation target 90 moving toward the target position, so that the fixation position of the eye E can be reliably guided to the target position. it can.

[Others]
In the movement control of each of the above-described embodiments, the display position of the fixation target 90 displayed on the target display unit 39 is moved, thereby moving the target position of the fixation target 90 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 flux 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 resonance type scanner (resonant scanner), a MEMS (Micro Electro Mechanical Systems) scanner, or the like is used.

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

  The gaze position detection method by the gaze position detection unit 216 according to the second embodiment is not limited to the method described with reference to FIGS. 15 and 16. For example, known line-of-sight positions such as a method using a positional relationship between a reference point such as the inner corner of the examiner and a moving point such as an iris of the eye E, and a method of detecting the movement of the eye E using an electro-oculogram sensor Detection methods can be used.

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

  In each of the above embodiments, the description has been given by taking as an example the multifunction machine of the optical coherence tomography and the fundus camera as the ophthalmologic apparatus 1. However, the optical coherence tomography, the fundus camera, the scanning laser ophthalmoscope, the laser treatment apparatus ( The present invention can be applied to various ophthalmic devices that present the fixation target 90 to the eye E to be examined, such as a photocoagulation device) and a perimeter.

1 ... ophthalmic equipment,
2 ... fundus camera unit,
10 ... Illumination optical system,
22 ... objective lens,
22a: lens center,
22b: lens peripheral portion,
30 ... photographing optical system,
39 ... Target display part,
70 ... gaze position detecting optical system,
90 ... fixation target,
92 ... locus image,
94 ... gaze position information,
200 ... arithmetic and control unit,
202 ... General control unit,
210 ... operation unit,
212 ... correspondence information,
214 ... display control unit,
216 ... gaze position detector

Claims (10)

An objective lens,
A fixation target display unit that displays a fixation target, and a fixation target presentation unit that has an optical system that projects the light flux of the fixation target displayed on the target display unit through the objective lens to the subject's eye.
A position control unit that controls the fixation target presenting unit, and controls a target position, which is a position where the light flux of the fixation target passes through the objective lens.
With
In the case where the position control unit sets a region within a certain range around the optical axis of the objective lens in the objective lens as a lens center and sets a region outside the lens center as a lens periphery, When the target position of the optotype position is within the lens center, the fixation target presenting unit is caused to execute a limited control for restricting the optotype position to the target position, and the target position is within the lens peripheral portion. An ophthalmologic apparatus that causes the fixation target presenting unit to execute a movement control for moving the target position from a reference position in the center of the lens to the target position. When the position control unit causes the fixation target presentation unit to execute the movement control, the trajectory display control unit causes the optotype display unit to execute display of a trajectory image indicating the trajectory of the optotype position,
The ophthalmologic apparatus according to claim 1, wherein the optical system projects the light flux of the trajectory image displayed on the optotype display unit through the objective lens to the eye to be examined. A gaze position detection unit that detects a gaze position of the subject's eye 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 target display unit through the objective lens to the eye to be inspected. A gaze position detection unit that detects a gaze position of the subject's eye in the objective lens,
When the position control unit causes the fixation target presentation unit to execute the movement control, based on a detection result of the gaze position detection unit, a correction control for correcting a positional shift of the optotype position with respect to the gaze position. The ophthalmologic apparatus according to claim 1, wherein the fixation target presentation unit executes the fixation target presentation unit.   The ophthalmologic apparatus according to claim 4, wherein the position control unit causes the fixation target presenting unit to execute control of a moving speed of the target position or position control of the target position as the correction control.   An optotype display control section that 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 temporally changed or predetermined. The ophthalmologic apparatus according to any one of claims 1 to 5, further comprising an optotype display control unit configured to display the specific image as the fixation target on the optotype display unit.   The ophthalmologic apparatus according to claim 1, wherein the reference position is a position of the optical axis of the objective lens. When the target position is plural, the position control unit causes the fixation target presentation unit to execute the limited control or the movement control in order for each of the target positions,
7. The position control unit, when switching the target position from a position in the lens center to a position in the lens periphery, sets the target position in the lens center as the reference position. 8. 2. The ophthalmologic apparatus according to claim 1.   The ophthalmologic apparatus according to claim 1, wherein the position control unit controls the display position of the fixation target displayed on the target display unit as the control of the target position. A fixation target presenting unit having an objective lens, a target display unit that displays a fixation target, and an optical system that projects the light flux of the fixation target displayed on the target display unit through the objective lens to the eye to be inspected And a position control unit that controls the fixation target presenting unit to control a target position where a light flux of the fixation target passes through the objective lens.
In the case where the position control unit sets an area within a certain range around the optical axis of the objective lens in the objective lens as a lens center and sets an area outside the lens center as a lens periphery, When the target position of the target position is within the lens center, the fixation target presenting unit is configured to execute the limited control for limiting the target position to the target position, and when the target position is within the lens peripheral part. An operation method of an ophthalmologic apparatus that causes the fixation target presenting unit to execute a movement control for moving the target position from a reference position in the lens center to the target position.

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