JP2016049243A - Ophthalmologic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new technology to detect whether or not an attachment is mounted on an ophthalmologic apparatus.SOLUTION: An ophthalmologic apparatus includes a body part, an attachment, a light detection part, and an information generation part. An optical system for acquiring information on an eye to be examined is stored in the body part. The attachment can be arranged between the body part and the subject. The light detection part is configured so as to detect reflected light by the attachment. The information generation part generates information on the attachment based on the output from the light detection part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ophthalmic apparatus.

  The ophthalmologic apparatus includes an ophthalmologic photographing apparatus for obtaining an image of the eye to be examined and an ophthalmologic measuring apparatus for measuring the characteristics of the eye to be examined.

  As an example of an ophthalmologic photographing apparatus, an optical coherence tomography (Optical Coherence Tomography, OCT) is used to obtain a cross-sectional image, a fundus camera for photographing the fundus, and laser scanning using a confocal optical system. There are a scanning laser ophthalmoscope (SLO) that obtains an image, a slit lamp that obtains an image by cutting out a light section of the cornea using slit light, and the like.

  Examples of ophthalmic measuring devices include an ocular refraction examination device (refractometer, keratometer) that measures the refractive characteristics of the eye to be examined, a tonometer, a specular microscope that obtains corneal properties (corneal thickness, cell distribution, etc.), Hartmann There are a wave front analyzer, an axial length measuring device, and the like that obtain aberration information of the eye to be examined using a shack sensor. In addition, various types of multi-function machines combining two or more ophthalmologic apparatuses are also used.

  In some ophthalmic devices, an attachment for applying a predetermined function is used. As a typical attachment, there is an attachment including an optical system arranged between an optical system for photographing and examination and an eye to be examined. For example, there is an optical coherence tomography for fundus photography that can be equipped with an attachment storing a lens system for anterior eye photography. There are also forehead and chin rest attachments.

  In addition, an ophthalmic apparatus that can automatically determine whether or not an attachment is attached is known. In these ophthalmologic apparatuses, a magnetic sensor using a Hall element, a capacitance-type distance sensor, and a switch-type sensor are used to detect whether or not an attachment is attached.

Japanese Patent No. 5319799 JP 2013-212314 A

  According to such a conventional ophthalmologic apparatus, it is possible to detect whether or not the attachment is attached, but it is not possible to determine whether or not the attachment is appropriately attached. For example, it is impossible to detect that the attachment is mounted in the wrong direction or that the attachment is insufficiently mounted.

  An object of the present invention is to provide a novel technique for detecting whether or not an attachment is attached to an ophthalmologic apparatus.

  A further object of the present invention is to provide a technique capable of detecting not only the presence / absence of attachment but also the attachment state of the attachment.

In order to achieve the above-mentioned object, the invention according to claim 1 can be arranged between a main body part in which an optical system for acquiring information about an eye to be examined is stored, and between the main body part and the subject. An ophthalmologic apparatus includes an attachment, a light detection unit capable of detecting light reflected by the attachment, and an information generation unit that generates information on the attachment based on an output from the light detection unit.
The invention according to claim 2 is the ophthalmologic apparatus according to claim 1, wherein the light detection unit images the outer surface of the attachment in a state where the light detection unit is disposed between the main body unit and the subject. The information generation unit includes information on the attachment by analyzing an image acquired by the imaging unit.
The invention according to claim 3 is the ophthalmologic apparatus according to claim 2, wherein a mark is attached to an outer surface of the attachment, and the information generation unit relates to the attachment based on an image of the mark. It is characterized by generating information.
The invention according to claim 4 is the ophthalmologic apparatus according to claim 3, wherein the information generation unit generates information representing a mounting state of the attachment based on a rendering state of the image of the mark. Features.
The invention according to claim 5 is the ophthalmologic apparatus according to claim 3, wherein the mark has an asymmetric shape, and the information generation unit represents a mounting state of the attachment based on an image of the mark. It is characterized by generating information.
Invention of Claim 6 is an ophthalmologic apparatus as described in any one of Claims 3-5, Comprising: The said information generation part WHEREIN: The image of the said mark is added to the image acquired by the said imaging | photography part. A mark image determination unit that determines whether or not the mark is included is included, and when it is determined that the image of the mark is not included, a determination result that the attachment is not attached is generated.
The invention according to claim 7 is the ophthalmologic apparatus according to claim 6, further comprising a mode switching unit that switches an operation mode of the main body based on a determination result by the mark image determination unit. .
Invention of Claim 8 is an ophthalmologic apparatus as described in any one of Claims 3-7, Comprising: A some attachment can be selectively arrange | positioned between the said main-body part and a subject. The plurality of attachments are marked differently from each other, and the information generation unit is configured to determine the type of attachment arranged based on the image of the mark included in the image acquired by the imaging unit. It includes a type determination unit for determining
The invention according to claim 9 is the ophthalmologic apparatus according to claim 8, further comprising a mode selection unit that selects an operation mode of the main body based on a determination result by the type determination unit. .
A tenth aspect of the present invention is the ophthalmologic apparatus according to the eighth aspect, wherein the storage unit stores in advance related information in which the types of the plurality of attachments and the plurality of operation modes of the main body unit are associated with each other. A mode designating unit for designating an operation mode of the main body unit, and a collation unit for collating the operation mode designated using the mode designating unit and the determination result by the type judging unit based on the related information And an output unit for outputting a collation result by the collation unit.
Invention of Claim 11 is an ophthalmologic apparatus as described in any one of Claims 3-10, Comprising: The said imaging | photography part is possible for video recording, The moving image acquired by the said imaging | photography part And a control unit for controlling the main body based on a change of the mark with time.
The invention according to claim 12 is the ophthalmologic apparatus according to any one of claims 2 to 11, wherein the information generation unit is configured to display the attachment based on a drawing state of an outline of the image of the attachment. It is characterized in that information representing the wearing state of the is generated.
The invention according to claim 13 is the ophthalmologic apparatus according to claim 1, wherein the optical system forms a first optical path for guiding light from the first light source to the eye to be examined via the objective lens, The attachment includes at least one lens disposed between the objective lens and the eye to be examined in the first optical path, and a second optical path of light from the second light source between the objective lens and the eye to be examined. A beam splitter for combining with the first optical path; and a light receiving unit for receiving reflected light of the light from the first light source by the beam splitter; the light detecting unit includes the light receiving unit; and the information generating unit includes: Information on the attachment is generated based on an output from the light receiving unit.
The invention according to claim 14 is the ophthalmologic apparatus according to claim 1, wherein the optical system irradiates the eye to be examined with an irradiation system through the objective lens, and irradiates the eye to be examined with the irradiation system. An imaging system that guides the return light of the generated light to an area image sensor, wherein the attachment includes one or more lenses disposed between the objective lens and the eye to be examined, and the light detection unit includes the area The information generation unit includes information on the attachment based on an image of the reflected light of the light from any one of the one or more lenses included in a captured image acquired by the area image sensor. Is generated.
The invention according to claim 15 is the ophthalmologic apparatus according to claim 1, wherein the main body divides light from the light source into measurement light and reference light, and returns the measurement light from the eye to be examined. An interference optical system that detects interference light obtained by causing light to interfere with the reference light, and an optical path length difference changing unit that changes an optical path length difference between a measurement optical path and a reference optical path in the interference optical system, The attachment includes one or more optical elements arranged in the measurement optical path, the light detection unit includes a photodetector provided in the interference optical system to detect the interference light, and the information generation unit includes The information on the attachment is generated based on the data acquired by the photodetector.

  According to the present invention, it is possible to provide a novel technique for detecting whether or not an attachment is attached to an ophthalmologic apparatus. Furthermore, according to this invention, it is possible to detect not only the presence / absence of attachment attachment but also the attachment attachment state.

It is a schematic diagram showing an example of composition of an ophthalmology device concerning an embodiment. It is a schematic diagram showing an example of composition of an ophthalmology device concerning an embodiment. It is the schematic showing an example of the composition of the attachment concerning an embodiment. It is the schematic showing an example of the composition of the attachment concerning an embodiment. It is the schematic showing an example of the composition of the attachment concerning an embodiment. It is the schematic showing an example of the composition of the attachment concerning an embodiment. It is a schematic diagram showing an example of composition of an ophthalmology device concerning an embodiment. It is a schematic diagram showing an example of composition of an ophthalmology device concerning an embodiment. It is a schematic diagram showing an example of composition of an ophthalmology device concerning an embodiment. It is a schematic diagram showing an example of composition of an ophthalmology device concerning an embodiment. It is the schematic for demonstrating the operation example of the ophthalmologic apparatus which concerns on embodiment. It is the schematic for demonstrating the operation example of the ophthalmologic apparatus which concerns on embodiment. It is a flowchart showing an example of operation | movement of the ophthalmologic apparatus which concerns on embodiment. It is the schematic showing an example of the composition of the attachment concerning an embodiment. It is the schematic showing an example of the composition of the attachment concerning an embodiment. It is the schematic for demonstrating the operation example of the ophthalmologic apparatus which concerns on embodiment.

  A typical example of an embodiment of an ophthalmologic apparatus according to the present invention will be described in detail with reference to the drawings. The ophthalmologic apparatus according to the embodiment is used for optical examination of an eye to be examined. As described above, such an ophthalmologic apparatus includes an ophthalmologic photographing apparatus and an ophthalmologic measurement apparatus. Examples of the ophthalmologic photographing apparatus include an optical coherence tomometer, a fundus camera, a scanning laser ophthalmoscope (SLO), and a slit lamp. Examples of the ophthalmologic measurement apparatus include an eye refraction inspection apparatus, a wave front analyzer, and an axial length measurement apparatus. In the following embodiments, an apparatus in which an optical coherence tomography and a fundus camera are combined will be described. However, the application target of the present invention is not limited to such a multifunction machine. For example, the present invention can be applied to a multi-function machine composed of other combinations or an ophthalmologic apparatus as a single machine.

  In this specification, images acquired by OCT may be collectively referred to as OCT images. In addition, a measurement operation for forming an OCT image may be referred to as OCT measurement. In addition, it is possible to use suitably the description content of the literature described in this specification as the content of the following embodiment.

  In the following embodiments, an optical coherence tomography using a so-called Spectral Domain type OCT equipped with a low coherence light source and a spectroscope will be described. It is also possible to apply the present invention to an optical coherence tomography using a type or in-face type OCT technique. Note that the swept source OCT scans (wavelength sweeps) the wavelength of the light irradiated to the object to be measured, and the interference light obtained by superimposing the reflected light of each wavelength and the reference light. This is a technique for obtaining a spectral intensity distribution by sequentially detecting and imaging the form of an object to be measured by applying a Fourier transform thereto. Further, in-face OCT is to irradiate the object to be measured with light having a predetermined beam diameter and analyze the component of the interference light obtained by superimposing the reflected light and the reference light. This is a technique for forming an image of an object to be measured in a cross section perpendicular to the light traveling direction, and is also called a full-field type.

<First Embodiment>
[Constitution]
As shown in FIG. 1, the ophthalmologic apparatus 1 includes a fundus camera unit 2, an OCT unit 100, and an arithmetic control unit 200. The retinal camera unit 2 has almost the same optical system as a conventional retinal camera. A pair of anterior eye cameras 300 for photographing the anterior eye portion Ea of the eye E is provided on the front surface of the fundus camera unit 2 (the surface facing the subject's face). The OCT unit 100 is provided with an optical system for acquiring an OCT image of the fundus. The arithmetic control unit 200 includes a computer that executes various arithmetic processes and control processes.

  One or more types of attachments can be attached to the ophthalmologic apparatus 1. Examples of the attachment include an anterior ocular segment imaging attachment in which an anterior ocular segment imaging lens is stored, a forehead attachment, a chin rest attachment, and the like. FIG. 1 shows a state in which an anterior segment imaging attachment 500 is mounted. The anterior segment imaging attachment 500 is disposed between the objective lens 22 of the fundus camera unit 22 and the eye E to be examined.

  At least a part of the anterior segment imaging attachment 500 is included in the imaging field of view of the anterior segment camera 300. That is, at least a part of the anterior segment imaging attachment 500 is depicted in an image captured by the anterior segment camera 300. When a configuration in which the imaging magnification, position, and orientation of the anterior segment camera 300 can be changed is applied, at least a part of the anterior segment imaging attachment 500 is included in the imaging field of view and not included Can be switched. Similarly, some of the other attachments may be included in the field of view of the anterior eye camera 300.

[Fundus camera unit]
The fundus camera unit 2 shown in FIG. 1 is provided with an optical system for obtaining a two-dimensional image (fundus image) representing the surface form of the fundus oculi Ef of the eye E to be examined. The fundus image includes an observation image and a captured image. The observation image is, for example, a monochrome moving image formed at a predetermined frame rate using near infrared light. In addition, when the optical system is focused on the anterior segment Ea of the eye E, the fundus camera unit 2 can obtain an observation image of the anterior segment Ea. The captured image may be, for example, a color image obtained by flashing visible light, or a monochrome still image using near infrared light or visible light as illumination light. The fundus camera unit 2 may be configured to be able to acquire images other than these, such as a fluorescein fluorescent image, an indocyanine green fluorescent image, a spontaneous fluorescent image, and the like.

  The retinal camera unit 2 is provided with a chin rest and a forehead support for supporting the subject's face. The chin rest and the forehead support correspond to the support portion 440 shown in FIGS. 5A and 5B. The chin rest attachment and the forehead attachment are attached to a predetermined position of the support portion 440. 5A and 5B, reference numeral 410 indicates a drive system such as the optical system drive unit 2A and a base in which an arithmetic control circuit is stored. Reference numeral 420 denotes a housing provided on the base 410 and storing an optical system. Reference numeral 430 denotes a lens housing portion that is provided on the front surface of the housing 420 and accommodates the objective lens 22.

  The fundus camera unit 2 is provided with an illumination optical system 10 and a photographing optical system 30. The illumination optical system 10 irradiates the fundus oculi Ef with illumination light. The photographing optical system 30 guides the fundus reflection light of the illumination light to an imaging device (CCD image sensor (sometimes simply referred to as a CCD) 35, 38). Further, the imaging optical system 30 guides the measurement light from the OCT unit 100 to the fundus oculi Ef and guides the measurement light passing through the fundus oculi Ef to the OCT unit 100.

  The observation light source 11 of the illumination optical system 10 is constituted by a halogen lamp, for example. The light (observation illumination light) output from the observation light source 11 is reflected by the reflection mirror 12 having a curved reflection surface, passes through the condensing lens 13, passes through the visible cut filter 14, and is converted into near infrared light. Become. Further, the observation illumination light is once converged in the vicinity of the photographing light source 15, 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 peripheral portion (region around the hole portion) of the aperture mirror 21, passes through the dichroic mirror 46, and is refracted by the objective lens 22 to illuminate the fundus oculi Ef. An LED (Light Emitting Diode) can also be used as the observation light source.

  The fundus reflection 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 central region of the perforated mirror 21, passes through the dichroic mirror 55, and is a focusing lens. It is reflected by the mirror 32 via 31. Furthermore, the fundus reflection light passes through the half mirror 39A, is reflected by the dichroic mirror 33, and forms an image on the light receiving surface of the CCD image sensor 35 by the condenser lens. The CCD image sensor 35 detects fundus reflected light at a predetermined frame rate, for example. On the display device 3, an image (observation image) based on fundus reflection light detected by the CCD image sensor 35 is displayed. When the photographing optical system is focused on the anterior segment, an observation image of the anterior segment of the eye E is displayed.

  The imaging light source 15 is constituted by, for example, a xenon lamp. The light (imaging illumination light) output from the imaging light source 15 is applied to the fundus oculi Ef through the same path as the observation illumination light. The fundus reflection light of the imaging illumination light is guided to the dichroic mirror 33 through the same path as that of the observation illumination light, passes through the dichroic mirror 33, is reflected by the mirror 36, and is reflected by the condenser lens 37 of the CCD image sensor 38. An image is formed on the light receiving surface. On the display device 3, an image (captured image) based on fundus reflection light detected by the CCD image sensor 38 is displayed. 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. In addition, when similar imaging is performed by illuminating the eye E with infrared light, an infrared captured image is displayed. It is also possible to use an LED as a photographing light source.

  An LCD (Liquid Crystal Display) 39 displays a fixation target and an eyesight measurement index. The fixation target is an index for fixing the eye E to be examined, and is used at the time of fundus photographing or OCT measurement.

  A part of the light output from the LCD 39 is reflected by the half mirror 39A, reflected by the mirror 32, passes through the focusing lens 31 and the dichroic mirror 55, passes through the hole of the perforated mirror 21, and reaches the dichroic. The light passes through the mirror 46, is refracted by the objective lens 22, and is projected onto the fundus oculi Ef.

  By changing the display position of the fixation target on the screen of the LCD 39, the fixation position of the eye E can be changed. As the fixation position of the eye E, for example, a position for acquiring an image centered on the macular portion of the fundus oculi Ef, or a position for acquiring an image centered on the optic disc as in the case of a conventional fundus camera And a position for acquiring an image centered on the fundus center between the macula and the optic disc. It is also possible to arbitrarily change the display position of the fixation target.

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

  The light (alignment light) output from the LED 51 of the alignment optical system 50 is reflected by the dichroic mirror 55 via the apertures 52 and 53 and the relay lens 54, passes through the hole of the perforated mirror 21, and reaches the dichroic mirror 46. And is projected onto the cornea 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, part of which passes through the dichroic mirror 55, passes through the focusing lens 31, is reflected by the mirror 32, and is half mirror The light passes through 39A, is reflected by the dichroic mirror 33, and is projected onto the light receiving surface of the CCD image sensor 35 by the condenser lens. The light reception image (alignment index) by the CCD image sensor 35 is displayed on the display device 3 together with the observation image. The user performs alignment by performing the same operation as that of a conventional fundus camera. Further, the arithmetic control unit 200 may perform alignment by analyzing the position of the alignment index and moving the optical system (auto-alignment function). In this embodiment, since auto-alignment can be performed using an anterior segment camera 300 described later, it is not essential that auto-alignment using an alignment index is possible. However, the auto-alignment using the alignment index can be performed when the auto-alignment using the anterior segment camera 300 is not successful, or the auto-alignment using the anterior segment camera 300 and the alignment index are used. It is also possible to configure such that automatic alignment can be selectively used.

  When performing the focus adjustment, the reflecting surface of the reflecting rod 67 is obliquely provided on the optical path of the illumination optical system 10. The light (focus light) output from the LED 61 of the focus optical system 60 passes through the relay lens 62, is separated into two light beams by the split indicator plate 63, passes through the two-hole aperture 64, and is reflected by the mirror 65, The light is focused on the reflecting surface of the reflecting bar 67 by the condenser lens 66 and reflected. Further, the focus light passes through the relay lens 20, is reflected by the perforated mirror 21, passes through the dichroic mirror 46, is refracted by the objective lens 22, and is projected onto the fundus oculi Ef.

  The fundus reflection light of the focus light is detected by the CCD image sensor 35 through the same path as the cornea reflection light of the alignment light. A light reception image (split index) by the CCD image sensor 35 is displayed on the display device 3 together with the observation image. The arithmetic and control unit 200 analyzes the position of the split index and moves the focusing lens 31 and the focus optical system 60 to perform focusing as in the conventional case (autofocus function). Alternatively, focusing may be performed manually while visually checking the split indicator.

  The dichroic mirror 46 branches the optical path for OCT measurement from the optical path for fundus photography. The dichroic mirror 46 reflects light in a wavelength band used for OCT measurement and transmits light for fundus photographing. In this 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 provided in this order from the OCT unit 100 side. It has been.

  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 or adjusting the interference state. 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 light (measurement light LS) passing through the optical path for OCT measurement. Thereby, the fundus oculi Ef can be scanned with the measurement light LS. The galvano scanner 42 includes, for example, a galvanometer mirror that scans the measurement light LS in the x direction, a galvanometer mirror that scans in the y direction, and a mechanism that drives these independently. Thereby, the measurement light LS can be scanned in an arbitrary direction on the xy plane.

  The fundus camera unit 2 is provided with an anterior eye camera 300. The anterior segment camera 300 images the anterior segment Ea substantially simultaneously from different directions. In this embodiment, two cameras are provided on the surface of the fundus camera unit 2 on the subject side (see anterior eye cameras 300A and 300B shown in FIG. 5A). Further, as shown in FIGS. 1 and 5A, the anterior eye cameras 300A and 300B are provided at positions deviated from the optical path of the illumination optical system 10 and the optical path of the photographing optical system 30, respectively. That is, the anterior eye cameras 300 </ b> A and 300 </ b> B are provided non-coaxially with the illumination optical system 10 and the imaging optical system 30. Hereinafter, the two anterior eye cameras 300A and 300B may be collectively represented by reference numeral 300.

  In this embodiment, two anterior eye cameras 300A and 300B are provided, but the number of anterior eye cameras according to the embodiment may be an arbitrary number of 2 or more (however, an alignment index is used). In some cases, it is not necessary to provide an anterior eye camera). However, in consideration of the arithmetic processing described later, a configuration that can photograph the anterior segment substantially simultaneously from two different directions is sufficient. In this embodiment, the anterior segment camera 300 is provided separately from the illumination optical system 10 and the imaging optical system 30, but at least the imaging optical system 30 can be used to perform similar anterior segment imaging. . That is, one of the two or more anterior segment cameras may be carried by a configuration including the imaging optical system 30. Anyway, this embodiment should just be comprised so that imaging | photography of the anterior ocular segment can be carried out substantially simultaneously from two different (or more) directions.

  Note that “substantially simultaneously” indicates that a photographing timing shift that allows negligible eye movement is allowed in photographing with two or more anterior segment cameras. Thereby, an image when the eye E is substantially at the same position (orientation) can be acquired by two or more anterior segment cameras.

  In addition, although shooting with two or more anterior eye cameras may be moving image shooting or still image shooting, in this embodiment, a case where moving image shooting is performed will be described in detail. In the case of moving image shooting, the above-described substantially simultaneous anterior ocular shooting can be realized by controlling the shooting start timing to match or by controlling the frame rate and shooting timing of each frame. Moreover, you may comprise so that the signal input simultaneously substantially simultaneously with respect to the control part 210 (after-mentioned) from two or more anterior eye part cameras may be matched. On the other hand, in the case of still image shooting, this can be realized by controlling to match the shooting timing.

  When the anterior segment imaging attachment 500 is attached, at least a part of the anterior segment imaging attachment 500 is included in at least one imaging field of view of the two or more anterior segment cameras. That is, at least a part of the anterior segment imaging attachment 500 is depicted in an image captured by one or more anterior segment cameras.

[OCT unit]
An example of the configuration of the OCT unit 100 will be described with reference to FIG. The OCT unit 100 is provided with an optical system for acquiring an OCT image of the fundus oculi Ef. This optical system has the same configuration as a conventional spectral domain type optical coherence tomography. That is, this optical system divides the light from the light source (low coherence light) into reference light and measurement light, and generates interference light by causing the measurement light passing through the fundus oculi Ef and the reference light passing through the reference optical path to interfere with each other. And it is comprised so that the spectral component of this interference light may be detected. This detection result (detection signal) is sent to the arithmetic control unit 200.

  In the case of a swept source type optical coherence tomography, a wavelength swept light source is provided instead of a light source that outputs a low coherence light source, and a balanced photodiode or the like is provided instead of a spectroscope. In general, for the configuration of the OCT unit 100, a known technique corresponding to the type of OCT can be arbitrarily applied.

  The light source unit 101 outputs a broadband low-coherence light L0. The low coherence light L0 includes, for example, a near-infrared wavelength band (about 800 nm to 900 nm) and has a temporal coherence length of about several tens of micrometers. Note that near-infrared light having a wavelength band that cannot be visually recognized by the human eye, for example, a center wavelength of about 1040 to 1060 nm, may be used as the low-coherence light L0.

  The light source unit 101 includes a light output device such as a super luminescent diode (SLD), an LED, or an SOA (Semiconductor Optical Amplifier).

  The low coherence light L0 output from the light source unit 101 is guided to the fiber coupler 103 by the optical fiber 102 and is divided into the measurement light LS and the reference light LR.

  The reference light LR is guided by the optical fiber 104 and reaches the optical attenuator (attenuator) 105. The optical attenuator 105 automatically adjusts the amount of the reference light LR guided to the optical fiber 104 under the control of the arithmetic control unit 200 using a known technique. The reference light LR whose light amount has been adjusted by the optical attenuator 105 is guided by the optical fiber 104 and reaches the polarization adjuster (polarization controller) 106. The polarization adjuster 106 is, for example, a device that adjusts the polarization state of the reference light LR guided in the optical fiber 104 by applying a stress from the outside to the optical fiber 104 in a loop shape. The configuration of the polarization adjuster 106 is not limited to this, and any known technique can be used. The reference light LR whose polarization state is adjusted by the polarization adjuster 106 reaches the fiber coupler 109.

  The measurement light LS generated by the fiber coupler 103 is guided by the optical fiber 107 and converted into a parallel light beam by the collimator lens unit 40. Further, the measurement light LS reaches the dichroic mirror 46 via the optical path length changing unit 41, the galvano scanner 42, the focusing lens 43, the mirror 44, and the relay lens 45. Then, the measurement light LS is reflected by the dichroic mirror 46, is refracted by the objective lens 22, and is applied to the fundus oculi Ef. The measurement light LS is scattered (including reflection) at various depth positions of the fundus oculi Ef. The backscattered light of the measurement light LS from the fundus oculi Ef travels in the same direction as the forward path in the reverse direction, is guided to the fiber coupler 103, and reaches the fiber coupler 109 via the optical fiber.

  The fiber coupler 109 causes the backscattered light of the measurement light LS to interfere with the reference light LR that has passed through the optical fiber 104. The interference light LC generated thereby is guided by the optical fiber 110 and emitted from the emission end 111. Further, the interference light LC is converted into a parallel light beam by the collimator lens 112, dispersed (spectral decomposition) by the diffraction grating 113, condensed by the condenser lens 114, and projected onto the light receiving surface of the CCD image sensor 115. Although the diffraction grating 113 shown in FIG. 2 is a transmission type, other types of spectroscopic elements such as a reflection type diffraction grating may be used.

  The CCD image sensor 115 is a line sensor, for example, and detects each spectral component of the split interference light LC and converts it into electric charges. The CCD image sensor 115 accumulates this electric charge, generates a detection signal, and sends it to the arithmetic control unit 200.

  In this embodiment, a Michelson type interferometer is employed, but any type of interferometer such as a Mach-Zehnder type can be appropriately employed. Further, in place of the CCD image sensor, another form of image sensor such as a CMOS (Complementary Metal Oxide Semiconductor) image sensor can be used.

[Calculation control unit]
The configuration of the arithmetic control unit 200 will be described. The arithmetic control unit 200 analyzes the detection signal input from the CCD image sensor 115 and forms an OCT image of the fundus oculi Ef. The calculation process for this is the same as that of a conventional spectral domain type optical coherence tomography.

  The arithmetic control unit 200 controls each part of the fundus camera unit 2, the display device 3, and the OCT unit 100. For example, the arithmetic control unit 200 displays an OCT image of the fundus oculi Ef on the display device 3.

  As the control of the fundus camera unit 2, the arithmetic control unit 200 controls the operation of the observation light source 11, the imaging light source 15 and the LEDs 51 and 61, the operation control of the LCD 39, the movement control of the focusing lenses 31 and 43, and the reflector 67. Movement control, movement control of the focus optical system 60, movement control of the optical path length changing unit 41, operation control of the galvano scanner 42, operation control of the anterior eye camera 300, and the like are performed.

  As control of the OCT unit 100, the arithmetic control unit 200 performs operation control of the light source unit 101, operation control of the optical attenuator 105, operation control of the polarization adjuster 106, operation control of the CCD image sensor 115, and the like.

  When the attachment includes an element (light source, drive unit, etc.) controlled by an electrical signal, the arithmetic control unit 200 can control this element. For example, when the anterior segment imaging attachment 500 includes a fixation light source and a lens driving unit, the arithmetic control unit 200 executes these controls. Further, when the forehead attachment or the chin rest attachment includes a mechanism for changing the form (position, size, orientation, etc.), the arithmetic control unit 200 executes control of this mechanism.

  The arithmetic control unit 200 includes, for example, a microprocessor, a RAM, a ROM, a hard disk drive, a communication interface, etc., as in a conventional computer. A computer program for controlling the ophthalmologic apparatus 1 is stored in a storage device such as a hard disk drive. The arithmetic control unit 200 may include various circuit boards, for example, a circuit board for forming an OCT image. The arithmetic control unit 200 may include an operation device (input device) such as a keyboard and a mouse, and a display device such as an LCD.

  The fundus camera unit 2, the display device 3, the OCT unit 100, and the calculation control unit 200 may be configured integrally (that is, in a single housing) or separated into two or more cases. It may be.

(attachment)
The attachment will be described. As described above, various types of attachments can be attached to the ophthalmologic apparatus 1. The forehead attachment and the chin rest attachment may have the same configuration as before. Here, the anterior segment imaging attachment 500 will be described.

  The external appearance of the anterior segment imaging attachment 500 is shown in FIG. 3A. A mark 510 </ b> A is attached to the side surface 500 </ b> A of the anterior segment imaging attachment 500. The side surface 500A is a surface on the anterior eye camera 300A side. The mark 510A has a predetermined form. For example, the mark 510A has a predetermined shape, size, color, density, fill pattern, and the like. In a state in which the anterior segment photographing attachment 500 is properly attached, the mark 510A is disposed at a predetermined position within the photographing visual field of the anterior segment camera 300A. Therefore, in a state in which the anterior segment imaging attachment 500 is properly attached, the mark 510A is drawn at a predetermined position in the image captured by the anterior segment camera 300A.

  Two or more marks can be provided on the anterior segment photographing attachment 500. For example, in addition to the mark 510A drawn in the shooting field of view of the anterior eye camera 300A as described above, a mark drawn in the shooting field of view of the anterior eye camera 300B can be provided. The mark drawn in the imaging field of view of the anterior segment camera 300B is provided, for example, on the opposing surface of the side surface 500A (the side surface on the anterior segment camera 300B side).

  When a plurality of anterior segment imaging attachments are selectively mounted, marks having different forms are provided on these anterior segment imaging attachments. Note that the different forms mean that at least one of the various elements related to the form such as shape, size, color, density, fill pattern, and position is different.

  Some typical examples of marks attached to the attachment are shown in FIGS. 3B-3D. A mark 511A shown in FIG. 3B is a circular mark. A mark 512A illustrated in FIG. 3C is an arrow-shaped mark. A mark 513A illustrated in FIG. 3D is an alphabetic “F” -shaped mark.

  The mark attached to the attachment is used to detect the attachment state of the attachment. As described above, when the anterior segment imaging attachment 500 is properly attached, a mark is drawn at a predetermined position in the image captured by the anterior segment camera 300. On the contrary, when the mounting position of the anterior ocular segment imaging attachment 500 is displaced from the appropriate position, the position, shape, size, orientation, etc., where the mark is drawn are different from the case where the mark is drawn at the appropriate position. In this embodiment, the mounting state of the anterior segment imaging attachment 500 is detected based on the image rendering mode of such a mark. Note that the wearing state includes not only the suitability of wearing but also the presence or absence of wearing. That is, it can be determined whether or not the anterior segment imaging attachment 500 is attached depending on whether or not a mark is depicted in an image captured by the anterior segment camera 300.

  The circular mark 511A shown in FIG. 3B has a symmetrical shape in an arbitrary direction on the side surface 500A. When the circular mark 511A is applied, a displacement corresponding to the rotational movement around the center position of the circular mark 511A cannot be detected, but it corresponds to other displacement, for example, parallel movement in the direction along the side surface 500A. It is possible to detect a displacement that includes a component in the normal direction of the side surface 500A, a displacement that corresponds to a rotational movement around a position other than the center position of the circular mark 511A, and the like.

  An arrow mark 512A shown in FIG. 3C has an arrow shape pointing upward (+ y direction). The direction of the arrow mark is not limited to the upward direction, and may be an arbitrary direction. The arrow mark 512A has a symmetric shape only with respect to a mirror having the arrow mark 512A itself as a fixed point set. Therefore, when the arrow mark 512A is applied, it is possible to detect a displacement corresponding to an arbitrary parallel movement and an arbitrary rotational movement in a three-dimensional space (real space). Note that the above mirroring occurs only when the front and rear anterior imaging attachments 500 are worn incorrectly. Accordingly, by configuring the anterior ocular segment imaging attachment 500 so that such erroneous mounting does not occur, or by providing the arrow mark 512A at a position other than the center position of the side surface 500A, any erroneous mounting detection can be performed. It becomes possible.

  The F mark 513A shown in FIG. 3D has an asymmetric shape with respect to an arbitrary affine transformation. Therefore, when the F mark 513A is applied, it is possible to detect any erroneous attachment of the anterior segment imaging attachment 500.

[Control system]
The configuration of the control system of the ophthalmologic apparatus 1 will be described with reference to FIGS. 4A and 4B.

(Control part)
The control system of the ophthalmologic apparatus 1 is configured around the control unit 210. The control unit 210 includes, for example, the aforementioned microprocessor, RAM, ROM, hard disk drive, communication interface, and the like. The control unit 210 is provided with a main control unit 211, a storage unit 212, an optical system position acquisition unit 213, and an operation mode control unit 214.

(Main control unit)
The main control unit 211 performs the various operation controls described above. The movement control of the focusing lens 31 is to move the focusing lens 31 in the optical axis direction by controlling a focusing drive unit (not shown). Thereby, the focus position of the photographic optical system 30 is changed. The movement control of the focusing lens 43 is to move the focusing lens 43 in the optical axis direction by controlling a focusing drive unit (not shown). Thereby, the focus position of the measurement light LS is changed.

  The main control unit 211 can control the optical system driving unit 2A to move the optical system provided in the fundus camera unit 2 three-dimensionally. This control is executed in auto alignment and tracking. Here, the tracking is an operation of moving the apparatus optical system in accordance with the eye movement of the eye E. Tracking is performed, for example, at a later stage than alignment (in some cases, focusing is also performed in advance). Tracking is a function that maintains a suitable positional relationship in alignment (and focus) by causing the position of the apparatus optical system to follow the eye movement.

  Note that the optical system drive unit 2A of this embodiment moves the optical system mounted on the fundus camera unit 2, but the optical system mounted on the fundus camera unit 2 and the optical system mounted on the OCT unit 100. May be moved by the optical system driving unit 2A.

  In addition, since the anterior eye camera 300 of this embodiment is provided in the housing of the fundus camera unit 2, the anterior eye camera 300 is moved by controlling the optical system driving unit 2A (imaging moving unit). Can do. Further, it is possible to provide a photographing moving unit that can independently move two or more anterior eye camera 300. Specifically, the imaging moving unit may include a drive mechanism (an actuator, a power transmission mechanism, etc.) provided for each anterior eye camera 300. The imaging moving unit is configured to move two or more anterior eye cameras 300 by transmitting power generated by a single actuator by a power transmission mechanism provided for each anterior eye camera 300. May be.

  Further, the main control unit 211 performs processing for writing data into the storage unit 212 and processing for reading data from the storage unit 212.

(Memory part)
The storage unit 212 stores various data. Examples of the data stored in the storage unit 212 include OCT image image data, fundus image data, and examined eye information. The eye information includes information about the subject such as patient ID and name, and information about the eye such as left / right eye identification information. The storage unit 212 stores various programs and data for operating the ophthalmologic apparatus 1.

  When a plurality of attachments are selectively mounted, related information in which the attachment type and the operation mode of the ophthalmologic apparatus 1 are associated can be stored in the storage unit 212 in advance. For example, a plurality of attachments may be alternatively arranged between the objective lens 22 and the eye E. As a specific example thereof, the anterior segment imaging attachment 500 and the wide-angle imaging attachment may be alternatively applied. The wide-angle shooting attachment is used when performing wide-angle shooting of the fundus oculi Ef, and includes a lens system therefor. In the related information prepared in this case, “anterior segment imaging” that is the type of the anterior segment imaging attachment 500 and the “anterior segment imaging mode” that is the operation mode are associated with each other, and for the wide angle imaging. “Wide-angle shooting” that is the type of attachment is associated with “wide-angle shooting mode” that is the operation mode. As described above, it is assumed that the anterior segment imaging attachment 500 and the wide-angle imaging attachment are provided with different marks. Processing executed using related information will be described later.

(Optical system position acquisition unit)
The optical system position acquisition unit 213 acquires the current position of the inspection optical system mounted on the ophthalmologic apparatus 1. The inspection optical system is an optical system used to optically inspect the eye E. The optical system for examination in the ophthalmologic apparatus 1 (combined machine of fundus camera and optical coherence tomography) of this embodiment is an optical system for obtaining an image of the eye to be examined.

  The optical system position acquisition unit 213 receives, for example, information indicating the content of movement control of the optical system driving unit 2A by the main control unit 211, and acquires the current position of the inspection optical system moved by the optical system driving unit 2A. To do. A specific example of this process will be described. The main control unit 211 controls the optical system driving unit 2A at a predetermined timing (when the apparatus is activated, when patient information is input, etc.) to move the examination optical system to a predetermined initial position. Thereafter, each time the optical system driving unit 2A is controlled, the main control unit 211 records the control contents. Thereby, a history of control contents is obtained. The optical system position acquisition unit 213 acquires the control content up to the present with reference to this history, and obtains the current position of the inspection optical system based on the control content.

  Further, whenever the main control unit 211 controls the optical system driving unit 2A, the control content is transmitted to the optical system position acquisition unit 213, and each time the optical system position acquisition unit 213 receives the control content, the inspection optical system is transmitted. The current position may be obtained sequentially.

  As another configuration example, a position sensor that detects the position of the inspection optical system may be provided in the optical system position acquisition unit 213.

  When the current position of the inspection optical system is acquired by the optical system position acquisition unit 213 as described above, the main control unit 211 determines the acquired current position and the eye to be examined obtained by the alignment processing unit 231 described later. Based on the three-dimensional position of E, the inspection optical system can be moved to the optical system driving unit 2A. Specifically, the main control unit 211 recognizes the current position of the inspection optical system based on the acquisition result by the optical system position acquisition unit 213, and recognizes the three-dimensional position of the eye E based on the analysis result by the alignment processing unit 231. . Then, the main control unit 211 changes the position of the inspection optical system from the current position so that the position of the inspection optical system with respect to the three-dimensional position of the eye E has a predetermined positional relationship. This predetermined positional relationship is such that the positions in the x direction and the y direction coincide with each other and the distance in the z direction becomes a predetermined working distance. Here, the working distance is a predetermined value called a working distance, and means a distance between the eye E to be inspected and the inspection optical system at the time of inspection using the inspection optical system.

(Operation mode controller)
The operation mode control unit 214 executes various processes related to the operation mode of the ophthalmologic apparatus 1. Hereinafter, some typical processes will be described, but the processes related to the operation mode are not limited to these. For example, the operation mode control unit 214 may be configured to execute any known process relating to the operation mode of the ophthalmologic apparatus. Further, the operation mode control unit 214 may be configured to be able to execute any one or more of the processes described below. When two or more of the processes described below can be executed, the two or more processes may be switched and executed, or the two or more processes may be executed serially in a predetermined order. However, these two or more processes may be executed in parallel.

  A first example of processing related to the operation mode is switching of the operation mode based on the detection result of whether or not the attachment is attached. In this example, a mark image determination unit 2321 described later renders a mark attached to the attachment (for example, a mark 510A attached to the anterior segment imaging attachment 500) in an image acquired by the anterior segment camera 300. Judgment is made. The operation mode control unit 214 switches the operation mode based on the determination result by the mark image determination unit 2321.

  This process will be described more specifically. When it is determined that the mark image is drawn on the image acquired by the anterior eye camera 300, the operation mode control unit 214 selects a default operation mode to be executed in a state where the attachment is attached. To do. On the other hand, when it is determined that the image of the mark is not drawn in the image acquired by the anterior eye camera 300, the operation mode control unit 214 performs a default operation mode that is executed in a state where the attachment is not attached. Select. The main control unit 211 applies a default setting corresponding to the operation mode selected by the operation mode control unit 214 to each unit of the apparatus.

  A specific example of such processing will be described. When it is determined that the image of the mark 510A of the anterior segment imaging attachment 500 is depicted in the image acquired by the anterior segment camera 300, the operation mode control unit 214 selects the anterior segment imaging mode. As default settings corresponding to the anterior segment imaging mode, for example, application of an anterior segment imaging light source, application of anterior segment imaging wavelength, application of an anterior segment imaging focus position, anterior segment imaging program , Application of an anterior ocular segment analysis program, application of an anterior ocular segment imaging drive program, and the like. On the other hand, when it is determined that the image of the mark 510A is not drawn in the image acquired by the anterior eye camera 300, the operation mode control unit 214 selects the fundus imaging mode. As default settings corresponding to the fundus imaging mode, for example, application of fundus imaging light source, application of fundus imaging wavelength, application of fundus imaging focus position, application of fundus imaging program, application of fundus analysis program, Application of a driving program for anterior segment imaging is available. The anterior ocular segment imaging program and the fundus imaging program include a program for executing an imaging protocol corresponding to the target region. Further, the anterior ocular segment analysis program and the fundus oculi analysis program include a program for executing an analysis process (for example, a calculation process of a parameter value representing a layer form, a thickness, or the like) according to a target region. Further, the anterior ocular segment imaging driving program and the fundus oculi imaging driving program include a program for executing an operation of moving a part or the whole of the optical system in accordance with the target region. As a specific example, the movable range in the + z direction of the fundus camera unit 2 at the time of anterior ocular photographing is more limited than the movable range of the fundus camera unit 2 in the + z direction at the time of fundus photographing.

  A second example of the process related to the operation mode is selection of an operation mode according to the type of attachment attached. In this example, a type determination unit 2323 (to be described later) determines the type of attachment that is currently attached based on the mark image included in the image acquired by the anterior eye camera 300. The operation mode control unit 214 selects an operation mode based on the determination result by the type determination unit 2323.

  This example is executed using, for example, the related information described above. The related information is information that associates a plurality of attachment types with operation modes, and is stored in the storage unit 212 in advance. In the example of the related information described above, the anterior segment imaging attachment 500 and the wide angle imaging attachment to which different marks are applied are alternatively applied. Further, the associated information associates the anterior segment imaging attachment 500 with the anterior segment imaging mode, and associates the wide angle imaging attachment with the wide angle imaging mode.

  In the type determination unit 2323, the mark drawn on the image acquired by the anterior segment camera 300 is the mark 510A attached to the anterior segment imaging attachment 500, or is attached to the wide angle imaging attachment. It is determined whether it is a mark. When it is determined that the drawn mark is the mark 510A attached to the anterior segment imaging attachment 500, the mode control unit 214 applies a default setting corresponding to the anterior segment imaging mode to each unit of the apparatus. . On the other hand, when it is determined that the drawn mark is a mark attached to the wide-angle shooting attachment, the mode control unit 214 applies a default setting corresponding to the wide-angle shooting mode to each part of the apparatus.

  A third example of the process related to the operation mode is a comparison between the operation mode designated manually or automatically and the operation mode corresponding to the type of the attached attachment. In this example, the control mode is specified separately from the control mode setting based on the captured image of the attachment. This control mode is specified manually or automatically. As an example of manual designation, the user designates the operation mode by using the user interface 240. Information indicating the type of the designated operation mode is sent from the main control unit 211 to the operation mode control unit 214. As an example of automatic designation, the main control unit 211 obtains information representing an operation mode applied to the subject eye in the past from the subject's electronic medical record or the like, and sends this information to the operation mode control unit 214. send. As another example of automatic designation, when the examination contents are determined in advance, such as a health checkup, a medical examination, or a clinical path, the main control unit 211 sends information indicating the type of operation mode included in the examination contents from the outside. Obtain this information and send this information to the operation mode control unit 214.

  As described above, the operation mode control unit 214 receives information (first operation mode type information) indicating the type of operation mode designated manually or automatically. On the other hand, the operation mode control unit 214 receives the attachment type determination result (second operation mode type information) by the type determination unit 2323. Furthermore, the operation mode control unit 214 collates the first operation mode type information with the second operation mode type information. That is, the operation mode control unit 214 determines whether or not the first operation mode type information and the second operation mode type information are the same.

  The main control unit 211 controls the user interface 240 based on this determination result (collation result). For example, the main control unit 211 causes the display unit 241 to display information representing the obtained matching result. In particular, when it is determined that the first operation mode type information and the second operation mode type information are different from each other, the main control unit 211 displays a message to that effect, a message prompting confirmation of the attachment, and an operation mode. A graphical user interface (GUI) or the like for manual selection is displayed.

  This specific example is applicable to the selection of two operation modes corresponding to the presence or absence of an attachment, such as selection between the fundus imaging mode and the anterior ocular segment imaging mode. It can be applied to selection of two or more operation modes corresponding to the type of attachment, such as selection between shooting modes (of course, it can also be applied to combinations thereof). In the latter case, it is possible to refer to the above-mentioned related information in which a plurality of attachment types and a plurality of operation modes are associated.

(Image forming part)
The image forming unit 220 forms image data of a cross-sectional image of the fundus oculi Ef based on the detection signal from the CCD image sensor 115. This process includes processes such as noise removal (noise reduction), filter processing, FFT (Fast Fourier Transform), and the like, similar to the conventional spectral domain type OCT. When another type of OCT is applied, the image forming unit 220 executes a known process corresponding to the type.

  The image forming unit 220 includes, for example, the circuit board described above. In this specification, “image data” and “image” based thereon may be identified.

(Data processing part)
The data processing unit 230 performs various types of image processing and analysis processing on the image formed by the image forming unit 220. For example, the data processing unit 230 executes various correction processes such as image brightness correction and dispersion correction. Further, the data processing unit 230 performs various types of image processing and analysis processing on the image (fundus image, anterior eye image, etc.) obtained by the fundus camera unit 2.

  The data processing unit 230 performs known image processing such as interpolation processing for interpolating pixels between cross-sectional images to form three-dimensional image data of the fundus oculi Ef. The three-dimensional image data means image data in which pixel positions are defined by a three-dimensional coordinate system. As the three-dimensional image data, there is image data composed of voxels arranged three-dimensionally. This image data is called volume data or voxel data. When displaying an image based on volume data, the data processing unit 230 performs rendering processing (volume rendering, MIP (Maximum Intensity Projection), etc.) on the volume data, and views the image from a specific gaze direction. Image data of a pseudo three-dimensional image is formed. The pseudo three-dimensional image is displayed on the display unit 241.

  It is also possible to form stack data of a plurality of cross-sectional images as 3D image data. The stack data is image data obtained by three-dimensionally arranging a plurality of cross-sectional images obtained along a plurality of scanning lines based on the positional relationship of the scanning lines. That is, stack data is image data obtained by expressing a plurality of cross-sectional images originally defined by individual two-dimensional coordinate systems by one three-dimensional coordinate system (that is, by embedding them in one three-dimensional space). is there.

  Further, the data processing unit 230 can form a cross-sectional image at an arbitrary cross-section based on the three-dimensional image data. This process is called section conversion or multi-planar reconstruction, and includes a process of extracting pixels (voxels) located in a specified section and a process of arranging the extracted pixels. .

  Further, the data processing unit 230 is provided with an alignment processing unit 231 and an attachment information generating unit 232.

(Alignment processing part)
The alignment processing unit 231 executes processing related to alignment using the anterior segment camera 300. More specifically, the alignment processing unit 231 obtains the three-dimensional position of the eye E by analyzing two or more captured images obtained substantially simultaneously by the two or more anterior segment cameras 300. As an example of a configuration for executing this processing, the alignment processing unit 231 includes an image correction unit 2311, a feature position specifying unit 2312, and a three-dimensional position calculation unit 2313.

(Image correction unit)
The image correction unit 2311 corrects the distortion of each captured image obtained by the anterior eye camera 300 based on the aberration information 212 a stored in the storage unit 212. This process is executed by, for example, a known image processing technique based on a correction coefficient for correcting distortion. Note that the aberration information 212a and the image correction unit 2311 do not have to be provided when the distortion aberration given to the captured image by the optical system of the anterior eye camera 300 is sufficiently small.

(Feature position identification part)
The feature position specifying unit 2312 analyzes each captured image (the distortion of which has been corrected by the image correcting unit 2311), thereby analyzing a position (feature position) in the captured image corresponding to a predetermined feature part of the anterior segment Ea. Specified). For example, the center of the pupil of the eye E or the apex of the cornea is used as the predetermined characteristic part. Hereinafter, a specific example of the process of specifying the pupil center will be described.

  First, the feature position specifying unit 2312 specifies an image region (pupil region) corresponding to the pupil of the eye E based on the distribution of pixel values (such as luminance values) of the captured image. In general, since the pupil is drawn with lower brightness than other parts, the pupil area can be specified by searching for the low brightness image area. At this time, the pupil region may be specified in consideration of the shape of the pupil. That is, the pupil region can be specified by searching for a substantially circular and low luminance image region.

  Next, the feature position specifying unit 2312 specifies the center position of the specified pupil region. Since the pupil is substantially circular as described above, the contour of the pupil region can be specified, the center position of this contour (approximate circle or approximate ellipse) can be specified, and this can be used as the pupil center. Further, the center of gravity of the pupil region may be obtained, and the center of gravity position may be used as the center of the pupil.

  Even when the feature position corresponding to another feature part is specified, it is possible to specify the feature position based on the distribution of pixel values of the photographed image in the same manner as described above.

(3D position calculator)
The three-dimensional position calculation unit 2313 determines the characteristic part of the eye E based on the positions of the two or more anterior eye camera 300 and the feature positions in the two or more captured images specified by the feature position specifying unit 2312. A three-dimensional position is calculated. This process will be described with reference to FIGS. 6A and 6B.

  FIG. 6A is a top view showing the positional relationship between the eye E and the anterior eye cameras 300A and 300B. FIG. 6B is a side view showing the positional relationship between the eye E and the anterior eye cameras 300A and 300B. The distance (baseline length) between the two anterior eye cameras 300A and 300B is represented by “B”. The distance (imaging distance) between the baselines of the two anterior eye cameras 300A and 300B and the characteristic part P of the eye E is represented by “H”. A distance (screen distance) between each anterior eye camera 300A and 300B and its screen plane is represented by “f”.

  In such an arrangement state, the resolution of the image captured by the anterior eye cameras 300A and 300B is expressed by the following equation. Here, Δp represents pixel resolution.

Resolution in xy direction (planar resolution): Δxy = H × Δp / f
Resolution in the z direction (depth resolution): Δz = H × H × Δp / (B × f)

  The three-dimensional position calculation unit 2313 is shown in FIGS. 6A and 6B with respect to the positions (known) of the two anterior eye cameras 300A and 300B and the feature position corresponding to the feature part P in the two captured images. By applying a known trigonometric method that takes into account the arrangement relationship shown, the three-dimensional position of the characteristic part P, that is, the three-dimensional position of the eye E to be examined is calculated.

  The three-dimensional position of the eye E calculated by the three-dimensional position calculation unit 2313 is sent to the control unit 210. Based on the calculation result of the three-dimensional position, the control unit 210 adjusts the optical axis of the inspection optical system to the axis of the eye E, and the distance of the inspection optical system with respect to the eye E is a predetermined operation. The optical system driving unit 2A is controlled so as to be a distance.

Further, when the anterior eye camera 300 shoots a moving image of the anterior eye part Ea from different directions in parallel, for example, the following processes (1) and (2) are performed to test the movement of the eye E to be examined. It is possible to perform tracking of the optical system.
(1) The alignment processing unit 231 sequentially analyzes the two or more frames obtained substantially simultaneously in the moving image shooting by the two or more anterior segment cameras 300, thereby sequentially determining the three-dimensional position of the eye E. Ask.
(2) The control unit 210 sequentially controls the optical system driving unit 2A based on the three-dimensional position of the eye E to be sequentially obtained by the alignment processing unit 231, so that the position of the inspection optical system is adjusted to that of the eye E to be examined. Follow the movement.

  The alignment processing unit 231 can obtain a displacement between the eye E and the inspection optical system based on the three-dimensional position of the eye E acquired by the three-dimensional position calculation unit 2313. This process is executed using the fact that the position of the anterior eye camera 300 and the position of the inspection optical system are known. The position of the inspection optical system is a predetermined position determined in advance, for example, a position where the front surface of the objective lens 22 (the surface on the eye E side) and the optical axis of the inspection optical system intersect. .

  Another example of the process for obtaining the displacement between the eye E and the inspection optical system will be described. In this example, an alignment index is projected on the anterior segment of the eye E. Further, the fundus camera unit 2 captures a moving image of the anterior segment where the alignment index is projected. In general, a pair of alignment indices is reflected in each frame acquired by this moving image shooting. The alignment processing unit 231 calculates a target displacement based on the drawing positions of the pair of alignment indexes.

  This process will be described more specifically. When the inspection optical system is arranged at a predetermined inspectable position with respect to the eye E, the pair of alignment indexes are drawn so as to overlap a predetermined position (for example, the frame center) of the frame. The inspectable position is, for example, that the x coordinate and y coordinate of a predetermined position of the eye E to be examined (corneal apex, pupil center, etc.) are substantially equal to the x coordinate and y coordinate of the optical axis of the inspection optical system, In addition, the positional relationship between the eye E and the inspection optical system is shown such that the distance between the eye E and the inspection optical system (for example, the objective lens 22) is substantially equal to a predetermined working distance. Also, the drawing position shift (first shift) between the two alignment indexes reflects the displacement from the working distance in the z direction, and the alignment index drawing position shift (second shift) with respect to the predetermined position of the frame. ) Reflects the displacement of the eye E from the predetermined position in the xy direction. By using this relationship, the alignment processing unit 231 obtains the displacement in the z direction from the first deviation, and obtains the displacement in the xy direction from the second deviation. Thereby, a three-dimensional displacement between the eye E and the inspection optical system is obtained. Such a displacement calculation process is a process executed in a known auto alignment.

(Attachment information generator)
The attachment information generation unit 232 generates information about the attachment (attachment information) based on the detection result of the reflected light by the attachment. Typical examples of the attachment information include information indicating the attachment state of the attachment (whether it is attached or not, appropriateness of attachment, etc.), information indicating the type of attachment, and the like. In this embodiment, attachment information is generated based on an image acquired by the anterior eye camera 300. The attachment information generation unit 232 includes a mark image determination unit 2321, an attachment state information generation unit 2322, and a type determination unit 2323.

(Mark image determination unit)
The mark image determination unit 2321 determines whether a mark attached to the attachment (for example, a mark 510A attached to the anterior segment imaging attachment 500) is depicted in an image acquired by the anterior segment camera 300. This process can be executed as follows, for example.

  An image acquired by one or both of the anterior eye camera 300 is sent to the data processing unit 230 via the control unit 210. The mark image determination unit 2321 determines whether an image area corresponding to the mark image is included in the input image by analyzing pixel values (such as luminance values) of the input image. This analysis processing may include known image processing for extracting a specific image region from the input image. For example, this analysis processing includes contour extraction processing (edge extraction processing) for extracting the contour of the mark image, template matching for collating the template image of the mark image with the candidate region of the mark image, and the like. Good. Further, the analysis process may include an image correction process (for example, contrast correction) for facilitating the extraction of the mark image.

  When the image area corresponding to the mark image is not extracted, the mark image determination unit 2321 obtains a determination result that the mark attached to the attachment is not drawn in the image acquired by the anterior eye camera 300. When this determination result is obtained, the attachment information generation unit 232 generates attachment information indicating that no attachment is attached, and sends this attachment information to the control unit 210. The control unit 210 can execute control based on the attachment information.

  On the other hand, when an image region corresponding to the mark image is extracted, the mark image determination unit 2321 obtains a determination result that the mark attached to the attachment is drawn in the image acquired by the anterior eye camera 300. . This determination result is sent to the wearing state information generation unit 2322 and the type determination unit 2323. When this determination result is obtained, the attachment information generation unit 232 can generate attachment information indicating that the attachment is attached. This attachment information is sent to the control unit 210. The control unit 210 can execute control based on the attachment information.

(Wearing state information generator)
When the mark image determination unit 2321 determines that the mark image is drawn, the wearing state information generation unit 2322 is information (mounting state information) indicating the attachment state of the attachment based on the drawing state of the mark image. ) Is generated. The wearing state information includes, for example, information (mounting suitability information) indicating whether or not the attachment is properly worn. The wearing suitability information is generated as follows, for example.

  As described above, the mark has a predetermined form. Furthermore, in a state where the attachment is properly attached, the mark is drawn at a predetermined position in the photographing field. Therefore, when the attachment state is not appropriate, the drawing position of the mark image is displaced from the appropriate position, the mark image is distorted, or the mark image is inclined. The wearing state information generation unit 2322 generates wearing suitability information by comparing the image drawing state of such a mark with an appropriate drawing state. Here, information representing an appropriate drawing state (appropriate drawing state information) is stored in advance in the storage unit 212, for example.

  When two or more marks are provided on the attachment, it can be used that the relative positional relationship between the images of these marks changes according to the attachment state of the attachment. That is, the mounting state information generation unit 2322 can generate mounting suitability information based on the relative positional relationship between two or more mark images. For example, information (appropriate rendering state information) indicating the relative positional relationship between the images of these marks when the attachment is properly attached is stored in advance in the storage unit 212 or the like. The wearing state information generation unit 2322 obtains the relative positional relationship between the images of these marks in the image captured by one or more anterior segment camera 300. Furthermore, the wearing state information generation unit 2322 generates wearing suitability information by comparing the obtained relative positional relationship with the appropriate rendering state information.

  The generated wearing state information (for example, wearing suitability information) is sent to the control unit 210. The control unit 210 can execute control based on the wearing state information.

(Type determination part)
When the mark image determination unit 2321 determines that the mark image is drawn, the type determination unit 2323 determines the type of attachment that is currently attached based on the mark image, and the determination result is Information to be represented (attachment type information) is generated. This process is particularly applied when two or more attachments are selectively mounted.

  As described above, two or more attachments are marked with different forms. The storage unit 212 stores in advance information associating two or more types of attachments with different mark forms (shape, size, color, density, fill pattern, etc.) attached thereto. The type determination unit 2323 specifies which mark form of the two or more predetermined marks the mark image extracted by the mark image determination unit 2321 corresponds to. This process includes, for example, template matching using a template of two or more predetermined marks and a determination process based on the feature of the mark form. Furthermore, the type determination unit 2323 specifies the attachment type associated with the mark form specified in the preceding process by referring to the above information. By such processing, the type determination unit 2323 determines, for example, whether the currently attached attachment is the anterior segment imaging attachment 500 or the wide angle imaging attachment.

  The data processing unit 230 that functions as described above includes, for example, the aforementioned microprocessor, RAM, ROM, hard disk drive, circuit board, and the like. In a storage device such as a hard disk drive, a computer program for causing the microprocessor to execute the above functions is stored in advance.

(User interface)
The user interface 240 includes a display unit 241 and an operation unit 242. The display unit 241 includes the display device of the arithmetic control unit 200 and the display device 3 described above. The operation unit 242 includes the operation device of the arithmetic control unit 200 described above. The operation unit 242 may include various buttons and keys provided on the housing of the ophthalmologic apparatus 1 or outside. For example, when the fundus camera unit 2 has a housing similar to that of a conventional fundus camera, the operation unit 242 may include a joystick, an operation panel, or the like provided on the housing. Further, the display unit 241 may include various display devices such as a touch panel provided in the housing of the fundus camera unit 2.

  The display unit 241 and the operation unit 242 do not need to be configured as individual devices. For example, a device in which a display function and an operation function are integrated, such as a touch panel, can be used. In that case, the operation unit 242 includes the touch panel and a computer program. The operation content for the operation unit 242 is input to the control unit 210 as an electrical signal. Further, operations and information input may be performed using the GUI displayed on the display unit 241 and the operation unit 242.

[Operation]
The operation of the ophthalmologic apparatus 1 will be described. An example of the operation of the ophthalmologic apparatus 1 is shown in FIG. This example includes some typical operations according to the embodiment, but the operations according to this embodiment are not limited thereto. For example, any one or more of these typical operations can be selectively combined, or any one or more of these typical operations can be combined with another operation.

  In the operation example described below, the ophthalmologic apparatus 1 is applied to a fundus photographing mode that is applied when no attachment is attached, and an anterior eye that is applied when the anterior eyepiece attachment 500 is attached. It is assumed that the partial photographing mode and the wide-angle photographing mode that is applied in a state where the attachment for wide-angle photographing is attached can be executed.

(S1: Patient registration)
First, the user inputs patient information of the subject using the user interface 240. Patient information includes patient ID, patient name, and the like.

(S2: Set shooting conditions)
Next, shooting conditions are set. Examples of imaging condition items include an imaging region (fundus / anterior segment, optic disc / macular / both), imaging eye (left eye / right eye / both eyes), and imaging pattern (fundus image only / OCT image only). / Both), OCT scan patterns (line scan / cross scan / radial scan / circle scan / three-dimensional scan, etc.).

(S3: Start photographing the anterior segment)
In response to the predetermined operation being performed, the control unit 210 starts imaging of the anterior segment Ea by the anterior segment cameras 300A and 300B. This shooting is moving image shooting in which the anterior segment Ea is a shooting target. Each anterior eye camera 300A and 300B shoots a moving image at a predetermined frame rate. Here, the imaging timings of the anterior eye cameras 300A and 300B may be synchronized by the control unit 210. Each anterior eye camera 300A and 300B sequentially sends the acquired frames to the control unit 210 in real time. The controller 210 associates the frames obtained by both anterior eye cameras 300A and 300B according to the photographing timing. That is, the control unit 210 associates frames acquired substantially simultaneously by both anterior eye cameras 300A and 300B. This association is executed, for example, based on the above-described synchronization control or based on the input timing of frames from the anterior eye cameras 300A and 300B. The control unit 210 sends a pair of associated frames to the data processing unit 230.

(S4: Determine presence or absence of mark image)
The mark image determination unit 2321 determines whether or not a mark image is drawn in the input frame.

  When it is determined that the mark image is not drawn (S4: NO), the attachment information generation unit 232 generates attachment information indicating that the attachment is not attached, and sends this attachment information to the control unit 210.

(S5: Apply fundus imaging mode)
The mode control unit 214 selects a fundus photographing mode corresponding to this attachment information. The main control unit 211 applies the setting corresponding to the fundus imaging mode to each unit of the ophthalmologic apparatus 1 and proceeds to step S12.

(S6: Determine whether the attachment is properly attached)
When it is determined in step S4 that the mark image is drawn (S4: YES), the mounting state information generation unit 2322 determines whether or not the attachment is properly mounted.

(S7: Warning that it is not properly installed)
When it is determined that the attachment is not properly attached (S6: NO), the attachment state information generation unit 2322 generates attachment information indicating that fact and sends it to the control unit 210. The main control unit 211 that has received the attachment information controls the user interface 240 to output information (warning information) indicating that the attachment is not properly attached.

(S8: The attachment state of the attachment is corrected)
The user who has recognized the warning information confirms and corrects the attachment state of the attachment. When the correction is completed, predetermined information is input to the control unit 210. The predetermined information may be, for example, an instruction from the user using the user interface 240, or is generated by the wearing state information generation unit 2322 based on an image acquired by the anterior eye camera 300, and the wearing is appropriate. Attachment information may be used. In response to the input of the predetermined information, the process proceeds to step S9.

(S9: Attachment type is anterior segment / wide angle?)
When it is determined in step S6 that the attachment is properly mounted (S6: YES) or when predetermined information is input in step S8, the type determination unit 2323 takes the anterior segment imaging of the mounted attachment. It is determined whether it is the attachment 500 for use or the attachment for wide angle imaging | photography. The type determination unit 2323 generates attachment information representing the determination result and sends it to the control unit 210.

(S10: Apply wide-angle shooting mode)
When it is determined that the attached attachment is a wide-angle shooting attachment (S9: wide-angle), the mode control unit 214 selects a wide-angle shooting mode corresponding to the attachment information from the type determination unit 2323. The main control unit 211 applies the setting corresponding to the wide-angle imaging mode to each unit of the ophthalmologic apparatus 1, and proceeds to step S12.

(S11: Apply the anterior segment imaging mode)
On the other hand, when it is determined that the attached attachment is an anterior segment imaging attachment (S9: anterior segment), the mode control unit 214 captures the anterior segment corresponding to the attachment information from the type determination unit 2323. Select a mode. The main control unit 211 applies settings corresponding to the anterior segment imaging mode to each unit of the ophthalmologic apparatus 1 and proceeds to step S12.

(S12: Perform stereo alignment etc.)
This completes the process related to the attachment. Upon completion of the process related to the attachment, the main control unit 211 executes another preparation operation for OCT measurement or the like. The preparation operation includes, for example, one of the following operations: alignment based on an image acquired by the anterior eye camera 300 (stereo alignment); focus adjustment of the imaging optical system 30; tracking; frame of an OCT image An optical path length difference adjustment (auto Z) between the measurement light LS and the reference light LR for displaying an image at a predetermined position within the optical path; an optical path length difference for maintaining the optical path length difference achieved by the auto Z Control (Z lock); focus adjustment for measurement light LS (adjustment of beam waist depth); polarization adjustment for optimizing interference sensitivity between measurement light LS and reference light LR. The contents of the preparation operation are selected according to the operation mode, for example.

(S13: Perform OCT, etc.)
When the preparatory operation such as stereo alignment is completed, the main control unit 211 causes OCT measurement and imaging of the eye E to be examined. The data processing unit 230 can execute an analysis process based on data acquired by OCT measurement or the like. The main control unit 211 can store data acquired by OCT measurement or the like in the storage unit 212 or transmit the data to an external device. This is the end of the process related to this operation example.

[effect]
The effect of the ophthalmologic apparatus according to the embodiment will be described.

  The ophthalmologic apparatus according to the embodiment includes a main body unit, an attachment, a light detection unit, and an information generation unit. The main body stores an optical system for acquiring information about the eye to be examined. This optical system includes, for example, an optical system for OCT measurement, an optical system for observing and photographing the anterior ocular segment, and an optical system for observing and photographing the fundus. An attachment can be arrange | positioned between a main-body part and a subject. The light detection unit is configured to be able to detect reflected light from the attachment. The information generation unit (attachment information generation unit 232) generates attachment information based on the output from the light detection unit. The information regarding the attachment includes information indicating whether or not the attachment is attached, information indicating whether or not the attachment is properly attached, and information indicating the type of attachment.

  According to such an embodiment, it is possible to detect whether or not the attachment is attached using an optical method based on reflected light from the attachment. Furthermore, according to this embodiment, by using such an optical method, it is possible to detect not only the presence / absence of attachment, but also the attachment state of the attachment.

  In the embodiment, the light detection unit may include an imaging unit capable of imaging the outer surface of the attachment that is disposed between the main body unit and the subject. In the above configuration, the anterior eye camera 300 for performing stereo alignment is used as an imaging unit. In other words, in the above-described configuration, the anterior segment imaging and the attachment imaging are performed using a common imaging unit. Further, the information generation unit is configured to generate attachment information by analyzing the image acquired by the imaging unit.

  According to such a configuration, it is possible to detect whether or not the attachment is attached and to detect the attachment state using an optical method based on an image obtained by photographing the attachment from the outside. . In addition, by using an imaging unit common to other uses (for example, stereo alignment), it is possible to realize an ophthalmologic apparatus having a multifunctional and simple configuration.

  In an embodiment, a mark can be provided on the outer surface of the attachment. In this case, the information generation unit can generate attachment information based on an image of a mark drawn on an image obtained by photographing the attachment.

  According to such a configuration, it is possible to provide a new technique of detecting whether or not an attachment is attached and whether or not the attachment is attached based on the presence or absence and form of a mark image in a photographed image of the attachment. It is.

  In the embodiment, the information generation unit can generate information representing the attachment state of the attachment as the attachment information based on the drawing state of the mark image. The drawing state of the mark image includes, for example, the position, orientation, and shape of the mark image. Further, this attachment information includes, for example, information indicating whether or not the attachment is properly attached.

  According to such a configuration, it is possible to provide a novel technique of detecting the attachment state of the attachment from the drawing state of the mark image in the photographed image of the attachment.

  In the embodiment, the mark attached to the attachment may have an asymmetric shape. In this case, the information generation unit can generate information representing the attachment state of the attachment based on the mark image. In the above configuration, the arrow mark 512A and the F mark 513A are illustrated.

  According to such a configuration, it is possible to detect the attachment state of the attachment with high accuracy and high accuracy by utilizing the asymmetry of the shape of the mark.

  In the embodiment, the information generation unit may include a mark image determination unit (2321) that determines whether a mark image is included in the image acquired by the imaging unit. When it is determined that the mark image is not included, the information generation unit generates a determination result indicating that the attachment is not attached.

  According to such a configuration, it is possible to provide a novel technique of detecting whether or not an attachment is attached depending on whether or not an image of a mark is drawn on a captured image of the attachment.

  In the embodiment, the ophthalmologic apparatus may include a mode switching unit that switches the operation mode of the main body based on the determination result by the mark image determination unit. In the above configuration, the mode control unit 214 functions as a mode switching unit.

  According to such a configuration, it is possible to provide a novel technique of switching an operation mode for acquiring information by the main body unit depending on whether or not a mark image is drawn on the captured image of the attachment. Is possible.

  In the embodiment, a plurality of attachments may be selectively arranged between the main body and the subject. These attachments are marked differently from each other. Further, the information generation unit determines a type of attachment arranged between the main body unit and the subject based on the mark image included in the image acquired by the imaging unit (2323). May be included.

  According to such a configuration, when a plurality of attachments can be selectively applied, the type of attachment attached to the main body is determined based on the form of the image of the mark drawn in the captured image of the attachment. It is possible to provide a novel technique of specifying.

  In the embodiment, the ophthalmologic apparatus may include a mode selection unit that selects an operation mode of the main body based on a determination result by the type determination unit. In the above configuration, the mode control unit 214 functions as a mode selection unit.

  According to such a configuration, it is possible to provide a new technique of switching the operation mode for acquiring information by the main body according to the form of the mark image depicted in the photographed image of the attachment. It is.

  In the embodiment, the ophthalmologic apparatus may include a storage unit, a mode specifying unit, a matching unit, and an output unit. The storage unit (212) previously stores related information in which a plurality of attachment types and a plurality of operation modes are associated with each other. The mode designating unit is used to designate the operation mode of the main body unit. In the above configuration, the user interface 240 or the control unit 210 functions as a mode specifying unit. The collation unit collates the operation mode designated using the mode designation unit and the determination result by the type determination unit based on the related information. In the above configuration, the mode control unit 214 functions as a verification unit. The output unit outputs a collation result by the collation unit. In the above configuration, the display unit 241 serves as an output unit. The information output by the output unit is not limited to visual information, and may include auditory information such as a warning sound.

  According to such a configuration, it is determined whether or not the specified operation mode matches the operation mode obtained from the captured image of the attachment, and if they do not match (that is, the specified operation mode or If the attached attachment is incorrect) it is possible to notify that. Thereby, it is possible to prevent photographing and measurement in an incorrect setting state.

  When the operation mode is designated first, the attachment type corresponding to the designated operation mode (that is, the attachment type to be attached) can be notified. Conversely, when the attachment is first attached, the type of operation mode corresponding to this attachment (that is, the type of operation mode to be designated) can be notified. Even with such a configuration, it is possible to prevent photographing and measurement in an erroneous setting state.

[Modification]
Several modifications regarding the above embodiment will be described.

(First modification)
There are attachments that can be operated manually. For example, there is an attachment that can manually change the diopter of the stored optical system and an attachment that can manually change the in-focus position. In the present modification, a configuration in which the content of an operation manually performed on an attachment can be recognized from a captured image of the attachment will be described.

  The ophthalmologic apparatus according to this modification may have a configuration similar to that of the above embodiment. In addition, the mark which changes according to the content of operation is attached | subjected to the attachment. A specific example will be described. The attachment is provided with a movable part for manual operation. Examples of the movable part include a rotationally movable part capable of rotating operation, a slide movable part capable of sliding operation, two or more buttons, and a dial. At least a part of the mark is attached to the movable part. A typical example of the mark is a scale. Thereby, the operation state of the movable part can be visually recognized.

  The anterior eye camera 300 performs moving image shooting. The attachment information generation unit 232 extracts a mark image by analyzing a frame acquired by the anterior eye camera 300. This process is sequentially performed on frames acquired in time series by the anterior eye camera 300. Further, the attachment information generation unit 232 obtains a time series change of the mark images extracted sequentially. This process includes, for example, a process for obtaining a displacement between the position and form of the mark image extracted from one frame and the position and form of the mark image extracted from the next frame, and sequentially in this way. And a process of accumulating the displacements required for the above. Thereby, a change with time such as the position of the mark according to the operation on the attachment can be obtained. The control unit 210 controls the fundus camera unit 2 and the OCT unit 100 based on the change over time acquired in this way. The operation content for the attachment and the control content of the fundus camera unit 2, the OCT unit 100, the data processing unit 230, and the user interface 240 are associated in advance.

  According to such a modification, the contents of the operation manually performed on the attachment can be grasped from the captured image of the attachment. Then, it is possible to display the acquired operation content and to control the optical system and the data processing system according to the operation content.

  In the conventional ophthalmologic apparatus, such a function is realized by mounting an electrical configuration on the attachment. However, it is difficult to say that mounting an electrical configuration on the attachment is preferable in consideration of the fact that the attachment is close to or in contact with the subject. On the other hand, this modification can be said to be preferable in that the function can be realized without mounting an electrical configuration on the attachment.

(Second modification)
In the above embodiment, the attachment state of the attachment is detected based on the mark image in the photographed image of the attachment, but the detection based on the photographed image is not limited to this.

  For example, as described above, at least a part of the attachment is depicted in the image captured by the anterior eye camera 300. When the attachment is not properly attached, the drawing position is displaced from the original position. Therefore, the attachment information generation unit 232 can be configured to generate information representing the attachment state of the attachment based on the drawing state of the attachment in the photographed image, particularly the drawing state of the outline.

  Such processing is performed by, for example, extracting an attachment outline from each frame, obtaining a displacement between the extracted outline state (position, inclination, etc.) and the original state, and whether the displacement is equal to or less than a threshold value. Includes processing to determine. When the displacement is equal to or less than the threshold value, it is determined that the attachment is properly attached. Conversely, when the displacement exceeds the threshold value, it is determined that the attachment state of the attachment is inappropriate.

  According to this modification, it is possible to determine the suitability of the mounting state of an attachment that is not provided with a mark.

  In addition, when a plurality of attachments having different forms such as contours are selectively attached, it is possible to determine the type of attachment attached based on the contour of the attachment drawn in the captured image. is there.

<Second Embodiment>
In the above embodiment, the attachment information is generated based on the reflected light from the outer surface of the attachment, that is, based on the photographed image of the appearance of the attachment. On the other hand, 2nd Embodiment demonstrates the case where attachment information is produced | generated based on the reflected light inside an attachment.

  The configuration of the ophthalmologic apparatus according to the second embodiment may be the same as that of the first embodiment. Hereinafter, the configuration of the first embodiment will be referred to as appropriate. In addition, the arbitrary items described in the first embodiment can be applied to the ophthalmologic apparatus according to the second embodiment.

  An example of the attachment according to this embodiment is shown in FIG. The attachment 600 is attached to the main body of the ophthalmologic apparatus (fundus camera unit 2 or the like) when photographing the anterior segment. That is, the attachment 600 is an example of the anterior segment imaging attachment 500.

  The attachment 600 is disposed between the objective lens 22 and the eye E to be examined. The attachment 600 is provided with two lenses 601 and 603 and a beam splitter 602 disposed therebetween. The two lenses 601 and 603 originally have a refractive power for moving the focal position of the ophthalmologic apparatus 1 for fundus photographing to the anterior segment. The beam splitter 602 combines the optical path of the ophthalmologic apparatus 1 (the optical path that passes through the objective lens 22) and another optical path. This other optical path guides light for performing peripheral fixation (referred to as peripheral fixation optical path). A collimator lens 604 is provided in the peripheral fixation optical path. The collimator lens 604 guides the light guided through the optical fiber 620 from the peripheral fixation light source 610 provided outside the attachment 600 to the beam splitter 602 as a parallel light beam. This parallel light beam (fixed light beam) is reflected by the beam splitter 602, enters the eye E through the lens 603, and is projected onto the fundus oculi Ef as a fixation target.

  Light (observation illumination light, imaging illumination light, measurement light LS, etc.) that has entered the attachment 600 through the objective lens 22 passes through the lens 601 and reaches the beam splitter 602. Most of the light that reaches the beam splitter 22 is guided to the eye E, but a small part of the light is reflected by the beam splitter 602 and detected by the light receiver 605. The light receiver 605 outputs an electrical signal in response to detecting a part of the light from the ophthalmologic apparatus 1. This electrical signal is input to the control unit 210. Upon receiving the electrical signal from the light receiver 605, the control unit 210 sends a signal indicating that this electrical signal has been received to the data processing unit 230. Upon receipt of this signal from the control unit 210, the attachment information generation unit 232 generates attachment information indicating that the attachment 600 is attached. The ophthalmologic apparatus 1 can execute the same processing as that of the first embodiment based on this attachment information.

  The operation and effect of this embodiment will be described.

  Similar to the first embodiment, the ophthalmologic apparatus according to this embodiment includes a main body (fundus camera unit 2, OCT unit 100, etc.), an attachment (600), a light detection unit, and an information generation unit (attachment information). Generator 232).

  The optical system stored in the main body part is a first optical path for guiding light from a first light source (observation light source 11, imaging light source 15, light source unit 101, etc.) to an eye to be examined (E) via an objective lens (22). Form. The attachment (600) includes one or more lenses (601, 603), a beam splitter (602), and a light receiving unit (605). One or more lenses (601, 603) are arranged between the objective lens (22) and the eye to be examined (E) in the first optical path. The beam splitter (602) combines the second optical path of light from the second light source (peripheral fixation light source 610) with the first optical path between the objective lens (22) and the eye to be examined (E). The light receiving unit (605) receives light reflected from the first light source (610) by the beam splitter (602). Here, the light receiving unit (605) is included in the light detection unit that can detect the reflected light by the attachment. An information generation part (232) produces | generates the information regarding an attachment based on the output from a light-receiving part (605).

  According to such an embodiment, it is possible to detect whether or not the attachment is attached using an optical method based on reflected light from the attachment.

  In addition, for example, by applying the following configuration, it is possible to detect not only the presence / absence of attachment but also the attachment state of the attachment. First, an area image sensor is used as a light receiver. When the attachment is properly mounted, the light from the ophthalmologic apparatus is projected onto a specific position (appropriate position) on the light receiving surface of the area image sensor. On the other hand, for example, when the attachment is mounted in a tilted state, the light from the ophthalmologic apparatus is projected at a position shifted from the appropriate position. The information generation unit specifies the projection position of the light from the ophthalmologic apparatus based on the output signal from the area image sensor, and determines whether this projection position is an appropriate position. When it is determined that the projection position is an appropriate position, the information generation unit generates attachment information indicating that the attachment is properly attached. On the other hand, when it is determined that the projection position is not an appropriate position, the information generation unit generates attachment information indicating that the attachment is not properly attached. In this case, based on the displacement of the projection position with respect to the appropriate position (displacement direction and amount of displacement), it is possible to acquire the attachment displacement state (direction of displacement, amount of displacement).

<Third Embodiment>
The ophthalmologic apparatus according to the third embodiment generates attachment information based on the reflected light inside the attachment, as in the second embodiment. The configuration of the ophthalmologic apparatus according to the third embodiment may be the same as that of the first embodiment. Hereinafter, the configuration of the first embodiment will be referred to as appropriate. Moreover, it is possible to apply the arbitrary matters described in the first embodiment to the ophthalmologic apparatus according to the third embodiment.

  An example of the attachment according to this embodiment is shown in FIG. The attachment 700 is attached to the main body of the ophthalmologic apparatus (fundus camera unit 2 or the like) when photographing the anterior segment. The attachment 700 is an example of the anterior segment photographing attachment 500.

  The attachment 700 is disposed between the objective lens 22 and the eye E to be examined. Similar to the attachment 600 in the second embodiment, the attachment 700 is provided with two lenses 701 and 703 and a beam splitter 702 disposed therebetween. The beam splitter 702 combines the optical path of the ophthalmologic apparatus 1 (the optical path that passes through the objective lens 22) and the peripheral fixation optical path. A collimator lens 704 is provided in the peripheral fixation optical path. The collimator lens 704 guides the light guided from the peripheral fixation light source 710 through the optical fiber 720 to the beam splitter 702 as a parallel light beam (fixation light beam). The fixation light flux is reflected by the beam splitter 702, enters the eye E through the lens 703, and is projected onto the fundus oculi Ef as a fixation target.

  When light from the ophthalmologic apparatus 1 is incident on such an attachment 700, reflected light from the lenses 701 and / or 703 in the attachment 700 returns to the ophthalmologic apparatus 1. For example, when the observation illumination light is irradiated with the attachment 700 attached, the reflected light of the observation illumination light by the lenses 701 and / or 703 is added to the CCD image sensor in addition to the return light of the observation illumination light reaching the eye E. 35. That is, a ghost attributed to the reflected light from the attachment 700 is reflected in the observation image of the eye E obtained with the attachment 700 attached.

  A typical example of a ghost caused by the reflected light from the attachment 700 is shown in FIG. Black spots are provided at positions on the optical axis of the lens surfaces of the lenses 701 and 703. This black dot acts to prevent regular reflection by the lens surface from being mixed into the image. Such reflected light from the lens surface appears in the observation image 750 as ring-shaped ghosts 761 and 762.

  The attachment information generation unit 232 determines whether such a ghost is reflected by analyzing the observation image (frame). When it is determined that the ghost is reflected, the attachment information generation unit 232 generates attachment information indicating that the attachment 700 is attached. On the other hand, when it is determined that the ghost is not reflected, the attachment information generation unit 232 generates attachment information indicating that the attachment 700 is not attached. The ophthalmologic apparatus 1 can execute the same processing as in the first embodiment based on such attachment information. Further, similarly to the second embodiment, it is possible to determine the attachment state of the attachment 700 (for example, whether or not it is properly attached) based on the position where the ghost is reflected.

  The operation and effect of this embodiment will be described.

  As in the first embodiment, the ophthalmologic apparatus according to this embodiment includes a main body (fundus camera unit 2, OCT unit 100, etc.), an attachment (700), a light detection unit, and an information generation unit (attachment information). Generator 232).

  The optical system stored in the main body includes an irradiation system (illumination optical system 10 and the like) and an imaging system (imaging optical system 30). The irradiation system (10) irradiates the eye (E) with light through the objective lens (22). The imaging system (30) guides the return light of the light irradiated to the eye to be examined (E) by the irradiation system (10) to an area image sensor (CCD image sensor 35 or the like). The attachment (700) includes one or more lenses (701, 703) disposed between the objective lens (22) and the eye to be examined (E). The area image sensor (35) is included in the light detection unit. The information generation unit (232) attaches the attachment (700) based on the reflected light image from one of the one or more lenses (701, 703) included in the captured image acquired by the area image sensor (35). Generate information about.

  According to such an embodiment, it is possible to detect whether or not the attachment is attached using an optical method based on reflected light from the attachment. Furthermore, according to this embodiment, by using such an optical method, it is possible to detect not only the presence / absence of attachment, but also the attachment state of the attachment.

  It is also possible to configure to determine the type of attachment based on the position and shape of the ghost rendered.

  In addition, this embodiment has an advantage that it is not necessary to provide an electrical configuration (light receiving unit) as in the second embodiment.

<Fourth Embodiment>
The ophthalmologic apparatus according to the fourth embodiment generates attachment information based on the reflected light inside the attachment, as in the second and third embodiments. In particular, in the fourth embodiment, an optical system for OCT is used. Note that the configuration of the ophthalmologic apparatus according to the fourth embodiment may be the same as that of the first embodiment. Hereinafter, the configuration of the first embodiment will be referred to as appropriate. In addition, the arbitrary items described in the first embodiment can be applied to the ophthalmologic apparatus according to the fourth embodiment.

  The configuration according to this embodiment can be applied to an attachment arranged in the path of OCT measurement light (measurement light LS). This attachment includes one or more optical elements (such as lenses) arranged in the path of the measurement light LS.

  As shown in FIGS. 1 and 2, the ophthalmologic apparatus 1 is provided with an interference optical system having an optical path (measurement optical path, measurement arm) of the measurement light LS and an optical path (reference optical path, reference arm) of the reference light LR. ing. The ophthalmologic apparatus 1 includes an optical path length changing unit 41 that changes the length of the measurement optical path as means for changing the optical path length difference between the measurement optical path and the reference optical path. In addition, you may provide the element (reference mirror etc.) which changes the length of a reference optical path.

  When generating the attachment information, the control unit 210 controls the optical path length changing unit 41 so that the optical elements in the attachment are drawn in the frame of the OCT image. This control may be, for example, control for moving the optical path length changing unit 41 to a predetermined position corresponding to the attachment, or by analyzing data collected while moving the optical path length changing unit 41. Control for searching for an appropriate position may be used.

  When the control for arranging the optical path length changing unit 41 at the predetermined position is executed, when this control is completed, the control unit 210 controls the OCT unit 100 to execute the OCT measurement. The attachment information generation unit 232 determines whether the optical element in the attachment is drawn by analyzing data acquired by OCT measurement. When it is determined that the optical element is drawn, the attachment information generation unit 232 generates attachment information indicating that the attachment is attached. On the other hand, when it is determined that the optical element is not drawn, the attachment information generation unit 232 generates attachment information indicating that no attachment is attached.

  Alternatively, when control for searching for an appropriate position of the optical path length changing unit 41 is performed, when an image of the optical element is drawn (that is, when an image of the optical element is detected), the attachment information generation unit 232 Attachment information indicating that the attachment is attached is generated. On the other hand, when the image of the optical element is not drawn regardless of the position of the optical path length changing unit 41 (that is, when the image of the optical element is not detected), the attachment information generating unit 232 attaches information indicating that no attachment is attached. Is generated.

  The ophthalmologic apparatus 1 can execute the same process as in the first embodiment based on the attachment information generated in this way. Further, similarly to the second embodiment, it is possible to determine the attachment state of the attachment (for example, whether or not it is properly attached) based on the position where the optical element is depicted, the inclination of the image, and the like. .

  Further, it is possible to determine the type of attached attachment based on the position and shape of the image of the optical element or the position of the optical path length changing unit 41. When two or more optical elements are stored in the attachment, the optical path length changing unit 41 is moved to detect images of these optical elements, and the relative positional relationship between the detected two or more optical elements is detected. It is possible to determine the type of attachment based on (distance in the z direction, etc.).

  The operation and effect of this embodiment will be described.

  As in the first embodiment, the ophthalmologic apparatus according to this embodiment includes a main body (fundus camera unit 2, OCT unit 100, etc.), an attachment (700), a light detection unit, and an information generation unit (attachment information). Generator 232).

  The main body includes an interference optical system (OCT unit 100, measurement optical path in the fundus camera unit 2, etc.) and an optical path length difference changing unit (optical path length changing unit 41). The interference optical system divides light from the light source (light source unit 101) into measurement light (LS) and reference light (LR), and returns return light of measurement light (LS) from the eye to be examined (E) as reference light ( LR) is detected, and interference light (LC) obtained by interference is detected. The optical path length difference changing unit (41) changes the optical path length difference between the measurement optical path and the reference optical path in the interference optical system. The attachment includes one or more optical elements disposed in the measurement optical path. The light detection unit includes a light detector (CCD image sensor 115) that is provided in the interference optical system and detects interference light (LC). An information generation part (232) produces | generates the information regarding an attachment based on the data acquired by the photodetector (115).

  According to such an embodiment, it is possible to detect whether or not the attachment is attached using an optical method based on reflected light from the attachment. Furthermore, according to this embodiment, by using such an optical method, it is possible to detect not only whether or not an attachment is attached, but also to detect the attachment state and determine the type of attachment.

  In addition, this embodiment has an advantage that it is not necessary to provide an electrical configuration (light receiving unit) as in the second embodiment.

<Modification>
The embodiment described above is only an example. A person who intends to implement the present invention can make arbitrary modifications (omission, replacement, addition, etc.) within the scope of the present invention.

  In the above embodiment, the optical path length difference between the optical path of the measurement light LS and the optical path of the reference light LR is changed by changing the position of the optical path length changing unit 41, but this optical path length difference is changed. The method is not limited to this. For example, it is possible to change the optical path length difference by disposing a reflection mirror (reference mirror) in the optical path of the reference light and moving the reference mirror in the traveling direction of the reference light to change the optical path length of the reference light. Is possible. Further, the optical path length difference may be changed by moving the fundus camera unit 2 or the OCT unit 100 with respect to the eye E to change the optical path length of the measurement light LS. In particular, when the measured object is not a living body part, the optical path length difference can be changed by moving the measured object in the depth direction (z direction).

  A computer program for realizing the above embodiment can be stored in any recording medium readable by a computer. Examples of the recording medium include a semiconductor memory, an optical disk, a magneto-optical disk (CD-ROM / DVD-RAM / DVD-ROM / MO, etc.), a magnetic storage medium (hard disk / floppy (registered trademark) disk / ZIP, etc.), and the like. Can be used.

DESCRIPTION OF SYMBOLS 1 Ophthalmology apparatus 2 Fundus camera unit 10 Illumination optical system 30 Imaging optical system 41 Optical path length change part 100 OCT unit 101 Light source unit 115 CCD image sensor 200 Arithmetic control unit 210 Control part 211 Main control part 212 Storage part 214 Operation mode control part 220 Image forming unit 230 Data processing unit 232 Attachment information generation unit 2321 Mark image determination unit 2322 Wear state information generation unit 2323 Type determination unit 241 Display unit 242 Operation unit 300, 300A, 300B Anterior eye camera 500, 600, 700 Attachment 510A, 511A, 512A, 513A Mark E Examination eye Ef Fundus

Claims (15)

A main body in which an optical system for acquiring information about the eye to be examined is stored;
An attachment that can be disposed between the main body and the subject;
A light detection unit capable of detecting reflected light by the attachment;
An ophthalmologic apparatus comprising: an information generation unit that generates information on the attachment based on an output from the light detection unit. The light detection unit includes a photographing unit capable of photographing the outer surface of the attachment in a state of being disposed between the main body unit and the subject.
The ophthalmic apparatus according to claim 1, wherein the information generation unit generates information on the attachment by analyzing an image acquired by the imaging unit. The outer surface of the attachment is marked,
The ophthalmic apparatus according to claim 2, wherein the information generation unit generates information on the attachment based on an image of the mark. The ophthalmologic apparatus according to claim 3, wherein the information generation unit generates information representing a mounting state of the attachment based on a rendering state of the image of the mark. The mark has an asymmetric shape;
The ophthalmic apparatus according to claim 3, wherein the information generation unit generates information indicating a mounting state of the attachment based on an image of the mark. The information generator is
A mark image determination unit that determines whether the image of the mark is included in the image acquired by the photographing unit;
The ophthalmology according to any one of claims 3 to 5, wherein when it is determined that the image of the mark is not included, a determination result that the attachment is not attached is generated. apparatus. The ophthalmologic apparatus according to claim 6, further comprising a mode switching unit that switches an operation mode of the main body based on a determination result by the mark image determination unit. A plurality of attachments can be selectively arranged between the main body and the subject,
The plurality of attachments are marked differently from each other,
The said information production | generation part contains the classification determination part which determines the classification of the attachment currently arrange | positioned based on the image of the mark contained in the image acquired by the said imaging | photography part. The ophthalmologic apparatus according to any one of 7. The ophthalmologic apparatus according to claim 8, further comprising a mode selection unit that selects an operation mode of the main body based on a determination result by the type determination unit. A storage unit that stores in advance related information in which a plurality of types of attachments and a plurality of operation modes of the main body unit are associated;
A mode designating unit for designating an operation mode of the main body unit;
Based on the related information, a collation unit that collates the operation mode designated using the mode designation unit and the determination result by the type determination unit;
The ophthalmologic apparatus according to claim 8, further comprising: an output unit that outputs a collation result by the collation unit. The shooting unit is capable of shooting a movie,
The control part which controls the main part based on change with time of the mark in the moving picture acquired by the photographing part is provided. The control part according to any one of claims 3 to 10 characterized by things. Ophthalmic equipment. The said information generation part produces | generates the information showing the mounting state of the said attachment based on the drawing state of the outline of the image of the said attachment. The ophthalmology as described in any one of Claims 2-11 characterized by the above-mentioned. apparatus. The optical system forms a first optical path for guiding light from the first light source to the eye to be examined through the objective lens,
The attachment is
One or more lenses disposed between the objective lens and the eye to be examined in the first optical path;
A beam splitter for combining a second optical path of light from a second light source with the first optical path between the objective lens and the eye to be examined;
A light receiving unit that receives light reflected from the first light source by the beam splitter,
The light detection unit includes the light receiving unit,
The ophthalmic apparatus according to claim 1, wherein the information generation unit generates information on the attachment based on an output from the light receiving unit. The optical system is
An irradiation system for irradiating light to the eye to be examined through an objective lens;
An imaging system for guiding the return light of the light irradiated to the eye to be examined by the irradiation system to the area image sensor;
Including
The attachment includes one or more lenses arranged between the objective lens and the eye to be examined.
The light detection unit includes the area image sensor,
The information generation unit generates information on the attachment based on an image of reflected light of the light from any one of the one or more lenses included in a captured image acquired by the area image sensor. The ophthalmic apparatus according to claim 1. The main body is
An interference optical system for detecting interference light obtained by dividing light from a light source into measurement light and reference light, and causing interference of return light of the measurement light from the eye to be examined with the reference light;
An optical path length difference changing unit that changes an optical path length difference between a measurement optical path and a reference optical path in the interference optical system,
The attachment includes one or more optical elements disposed in the measurement optical path,
The light detection unit includes a light detector that is provided in the interference optical system and detects the interference light,
The ophthalmologic apparatus according to claim 1, wherein the information generation unit generates information on the attachment based on data acquired by the photodetector.

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