JP2016123481A - Ophthalmologic apparatus, ophthalmologic system, and ophthalmologic apparatus control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To observe an anterior eye part by means of an anterior eye part observation optical system in tomographic image capturing of an anterior eye part conventionally using an adaptor for imaging an anterior eye part in an OCT apparatus for an eyeground.SOLUTION: An ophthalmologic apparatus comprises: a tomographic image capturing optical system for capturing a tomographic image of the eyeground of a subject eye; an anterior eye part observation optical system which includes imaging means for imaging the anterior eye part of the subject eye; and an optical head which has the optical systems incorporated therein and can have an adapter for imaging an anterior eye part to use when capturing the tomographic image of the anterior eye part, mounted to the position opposite from the subject eye. The ophthalmologic apparatus further comprises image formation position correction means which can be inserted to and removed from the optical path of the anterior eye part observation optical system and corrects the image formation position of the anterior eye part of the subject eye.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an ophthalmologic apparatus, an ophthalmologic system, and a method for controlling an ophthalmologic apparatus that capture a tomographic image of the fundus or anterior segment of an eye to be examined.

  As an ophthalmologic apparatus for capturing a tomographic image of the fundus of a subject's eye, an optical coherence tomography (hereinafter referred to as an OCT apparatus), which is an optical tomographic imaging apparatus, is known. An OCT apparatus that captures a tomographic image of the fundus of the subject's eye has an imaging means for observing the anterior segment of the subject's eye and an anterior ocular segment observation optical system, and the alignment state between the anterior segment and the apparatus is observed. Possible devices are known. There is also known an OCT apparatus that can capture a tomographic image of the anterior segment by attaching an anterior segment imaging adapter near the objective lens in order to capture a tomographic image of the anterior segment of the eye to be examined. (See Patent Document 1).

  When capturing a tomographic image of the fundus of the eye to be examined, the working distance between the eye to be examined and the apparatus is properly maintained in the optical system of the OCT apparatus. Further, the OCT optical system substantially conjugates the fundus of the eye to be examined with the light source and the light receiving means of the OCT optical system with respect to the diopter of the eye to be examined within a predetermined range due to the movement of the included focusing lens at the proper working distance. It is arranged to be able to. Further, in the OCT optical system, the optical path lengths of the reference light and the measuring light can be matched by moving the mirror of the reference optical system of the OCT according to the axial length of a predetermined range of the eye to be examined. In addition, the anterior ocular segment observation optical system used for observing the anterior ocular segment for alignment or the like is arranged so that the imaging means and the vicinity of the pupil of the eye to be examined are substantially conjugate. It is common.

  It is also possible to image the anterior eye portion of the eye to be examined by such an OCT apparatus that captures a tomographic image of the fundus of the eye to be examined. In this case, in the OCT apparatus, in order to match the optical path lengths of the reference light and the measurement light to the anterior eye portion of the eye to be examined, it is necessary to separate the working distance between the eye to be examined and the device from the time of fundus tomographic image capturing. That is, an anterior ocular segment imaging adapter including a correction lens in which the light source and light receiving means of the OCT optical system and the anterior ocular segment to be examined are substantially conjugated is attached in the vicinity of the objective lens. As a result, it is possible to obtain a tomographic image of the anterior segment by the OCT apparatus for the fundus.

JP 2011-147609 A

  However, when the anterior segment imaging adapter is attached in the vicinity of the objective lens, the conjugate relationship between the imaging means of the anterior segment observation optical system and the vicinity of the pupil of the eye to be examined is broken. As a result, it is impossible to perform alignment using the output image from the imaging means. In this case, if the OCT apparatus is equipped with a separate laser scanning ophthalmoscope (hereinafter referred to as an SLO apparatus) for fundus observation, observation of the anterior ocular segment to be examined is performed using the SLO apparatus. I can do it. If there is no SLO device or optical system, a pseudo SLO method is used to perform a two-dimensional scan of the OCT optical system between acquisition of tomographic images and generate a two-dimensional image from the luminance information of the acquired tomographic images. It is known to perform eye observation.

  Here, the range of the tomographic image in the depth direction is limited, and a pseudo SLO image difference occurs depending on the imaging region of the anterior segment. For example, when a tomographic image of the anterior segment at a depth near the iris is captured, a pupil serving as a marker for alignment can be confirmed on the pseudo SLO image. However, when capturing a tomographic image at a depth near the cornea, luminance information in the vicinity of the iris cannot be acquired from the tomographic image, and thus a pupil image serving as an alignment mark cannot be confirmed in the pseudo SLO image. Therefore, in this case, it is difficult to align the eye to be examined and the apparatus.

  The present invention has been made in view of the above situation. That is, in an ophthalmologic apparatus for fundus tomographic image capturing, an ophthalmic apparatus that allows an anterior ocular segment observation means to observe the anterior ocular segment even when an anterior ocular segment tomographic image capturing adapter is mounted, and the adapter are added. Another object is to provide an ophthalmic system and a method for controlling an ophthalmic apparatus.

In order to achieve the above object, an ophthalmologic apparatus according to the present invention includes:
A tomographic imaging optical system for imaging a tomographic image of the fundus of the eye to be examined;
An anterior ocular segment observation optical system including an imaging means for imaging the anterior ocular segment of the eye to be examined;
An optical system that is built in the tomographic imaging optical system and the anterior ocular segment observation optical system, and that can be mounted at a position facing the eye to be inspected, for an anterior ocular segment imaging adapter used when capturing a tomographic image of the anterior segment Head,
And an imaging position correction unit that is detachable with respect to the optical path of the anterior ocular segment observation optical system and corrects the imaging position of the anterior ocular segment to be examined.

  According to the present invention, even when an anterior ocular segment imaging adapter is attached to an ophthalmologic apparatus for imaging a fundus tomographic image, even when an anterior ocular segment tomographic image is to be captured, Observation of the anterior segment of the eye, alignment based on the observation, and the like are possible.

It is the schematic shown about the OCT apparatus whole structure concerning the 1st Embodiment of this invention. It is the schematic diagram which showed the structure of the measurement optical system of the OCT apparatus shown in FIG. 1 is a configuration diagram of an anterior segment imaging adapter according to a first embodiment of the present invention. FIG. It is explanatory drawing about the working distance at the time of fundus imaging and anterior segment imaging. It is explanatory drawing about the conjugate relationship of the anterior ocular segment observation optical system at the time of fundus imaging and anterior segment imaging. It is the figure which showed the example of the measurement operation screen in the OCT apparatus shown in FIG. It is the flowchart which showed the flow of the imaging of the anterior ocular segment tomographic image in the OCT apparatus which concerns on the 1st Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings. The following embodiments do not limit the present invention related to the scope of claims, and all combinations of features described in the present embodiments are essential for the solution means of the present invention. Is not limited.

[First Embodiment]
Hereinafter, an optical tomographic imaging apparatus (hereinafter referred to as an OCT apparatus) that captures a tomographic image of the fundus of a subject's eye as an example of an ophthalmologic apparatus to which the present invention is applied will be described as a first embodiment of the present invention. .

(Schematic configuration of the device)
A schematic configuration of the OCT apparatus according to the present embodiment will be described with reference to FIG.
FIG. 1 is an external view showing an outline of the overall configuration of the OCT apparatus according to the first embodiment of the present invention. The optical tomographic imaging apparatus 300 as an OCT apparatus includes an optical head 900, a stage unit 950, a base unit 951, a personal computer 925, a hard disk 926, a monitor 928, an input unit 929, and a chin rest 323. The optical head 900 corresponds to a measurement optical system for capturing a two-dimensional image and a tomographic image of the eye to be examined. The stage unit 950 corresponds to a moving unit that can move the optical head 900 in the xyz direction in the drawing using a motor (not shown). The base unit 951 supports the stage unit 950 and incorporates a spectroscope described later.

  The personal computer 925 also serves as a control unit of the stage unit 950 and performs tomographic image configuration and the like along with the control of the stage unit 950. The hard disk 926 is disposed along with the personal computer 925, and also stores a program for tomographic imaging and the like, which also serves as a subject information storage unit. The monitor 928 displays a tomographic image as a display unit, and the input unit 929 is specifically composed of a keyboard and a mouse for instructing the personal computer. The chin rest 323 promotes fixation of the subject's eyes (examined eye) by fixing the subject's chin and forehead.

(Configuration of measurement optical system and spectrometer)
With respect to the OCT apparatus according to the present embodiment, the configuration of the built-in measurement optical system and spectrometer will be described next with reference to FIG.

  First, the internal configuration of the optical head 900 will be described. An objective lens 101 is placed facing the eye 100, and a dichroic mirror 102 is placed on the optical axis. An anterior ocular segment observation optical system is disposed on the optical path L3 in the transmission direction of the dichroic mirror 102. The anterior ocular segment observation optical system includes a lens 110 integrated with an image split prism, an imaging lens 111, and a CCD 112. The CCD 112 is an imaging device having sensitivity at the wavelength of the anterior segment observation illumination 105 (105a and 105b in FIG. 3) arranged around the objective lens 101, specifically, around 970 nm.

  The anterior ocular segment observation illumination 105 as an anterior ocular segment illumination means constitutes an element of the anterior ocular segment observation optical system and illuminates the anterior ocular segment of the eye to be examined. The CCD 112 constitutes an imaging means for imaging the anterior eye part proved by the anterior eye part illumination means. Between the dichroic mirror 102 and the lens 110, an imaging correction lens 109 that is driven by a motor (not shown) and can be inserted into and removed from the optical axis L3 is disposed. As will be described later, the imaging correction lens 109 can be inserted into and removed from the optical path of the anterior ocular segment observation optical system, and corresponds to an imaging position correction unit that corrects the imaging position of the anterior ocular segment to be examined. To do. In the present embodiment, an example in which a lens is used as the imaging position correction unit is illustrated. However, the present invention is not limited to the lens and can be replaced by an optical member having an equivalent function of correcting the imaging position.

  A dichroic mirror 103 is disposed on the optical path in the reflection direction of the dichroic mirror 102. The optical path branched from the optical path L3 is branched for each wavelength band into an optical path L1 of the OCT optical system in the transmission direction of the dichroic mirror 103 and an optical path L2 for the internal fixation lamp in the reflection direction.

  A lens 104, a focusing lens 107, a lens 108, and an internal fixation lamp 106 are arranged in this order from the dichroic mirror 103 on the optical path L2. The focusing lens 107 is driven along the optical path L2 by a motor (not shown) to adjust the focus of the internal fixation lamp 106. The internal fixation lamp 106 generates visible light and promotes fixation of the subject.

  The optical path L1 forms an OCT optical system, and is for capturing a tomographic image of the fundus of the eye 100 to be examined, and constitutes a tomographic image imaging optical system. More specifically, an interference signal for forming a tomographic image is obtained. In the optical path L1, a lens 105, a mirror 113, an X scanner 114-1, a Y scanner 114-2, a focusing lens 115, and a lens 116 are arranged in this order from the dichroic mirror 103. Measurement light is introduced into these optical members from the end of the fiber 117-2 disposed at the tip of the lens 116.

  The X scanner 114-1 and the Y scanner 114-2 are used to scan the measurement light of the OCT apparatus on the fundus of the eye 100 to be examined. The focusing lens 115 is driven in the optical axis direction (arrow direction in the figure) by a motor (not shown) in order to adjust the light emitted from the end of the optical fiber 117-2 on the fundus of the eye 100 to be examined. Is done. The measurement light reflected from the fundus of the eye 100 to be inspected by this focusing adjustment is again incident on the tip of the optical fiber 117-2 through the optical path L1.

  Next, the configuration of the optical path from the light source 118, the reference optical system, and the spectroscope will be described.

  A light source 118 that supplies measurement light from the OCT apparatus emits light to the optical fiber 117-1. The optical fiber 117-1 is connected to the optical coupler 117. Optical couplers 117-2 to 4 are further connected to and integrated with the optical coupler 117. The reference optical system includes a lens 121, a dispersion compensation glass 120, and a reference mirror 119 as optical members arranged on the optical path of the reference light emitted from the optical fiber 117-3. The dispersion compensation glass 120 is disposed in the reference optical system in order to match the dispersion of the measurement light and the reference light. Further, the light that has passed through the optical fiber 117-4 from the optical coupler 117 is guided to the spectroscope 180. In this embodiment, a Michelson interferometer is configured by these configurations.

  More specifically, the light emitted from the light source 118 is guided to the optical coupler 117 through the optical fiber 117-1. The light guided to the optical coupler 117 is split by the optical coupler 117 into measurement light on the optical fiber 117-2 side and optical fiber 117-3 reference light. The measurement light is irradiated to the fundus of the eye 100 to be examined through the optical path L1 of the OCT optical system. The measurement light returns along the same optical path L1 due to reflection and scattering by the retina, and reaches the optical coupler 117 through the optical path L1 and the optical fiber 117-2.

  On the other hand, the reference light reaches the reference mirror 119 through the optical fiber 117-3, the lens 121, and the dispersion compensation glass 120, and is reflected. Then, it returns on the same optical path and reaches the optical coupler 117. The measurement light (return light) that reaches the optical coupler 117 via the optical fiber 117-2 and the reference light that reaches the optical coupler 117 via the optical fiber 117-3 are combined by the optical coupler 117 to become interference light. Here, interference occurs when the optical path length of the measurement light and the optical path length of the reference light satisfy a predetermined condition. The reference mirror 119 is held by a motor and a drive mechanism (not shown) so as to be adjustable in the optical axis direction (arrow direction in the figure), and matches the optical path length of the reference light to the optical path length of the measurement light that changes depending on the fundus position of the eye 100 to be examined. Is possible. The interference light generated by the optical coupler 117 is guided to the spectroscope 180 via the optical fiber 117-4.

  The spectroscope 180 includes a lens 181, a lens 183, a diffraction grating 182, and a line sensor 184. The interference light emitted from the optical fiber 117-4 becomes substantially parallel light via the lens 181, and then is dispersed by the diffraction grating 182 and imaged on the line sensor 184 by the lens 183. The line sensor 184 is shown as an example of a light receiving element that receives interference light and generates and outputs an output signal corresponding to the interference light in the present invention.

  Next, the periphery of the light source 118 will be described. As the light source 118, an SLD (Super Luminescent Diode) which is a typical low coherent light source is used. The center wavelength of the light used is 855 nm, and the wavelength bandwidth is about 100 nm. Here, the bandwidth is an important parameter because it affects the resolution of the obtained tomographic image in the optical axis direction. In view of measuring the eye, the center wavelength is preferably near infrared light. Moreover, since the center wavelength affects the lateral resolution of the obtained tomographic image, it is desirable that the center wavelength be as short as possible. For both reasons, in this embodiment, the center wavelength of the measurement light is 855 nm.

  In this embodiment, a Michelson interferometer is used as an interferometer, but a Mach-Zehnder interferometer may be used.

(Acquisition method of anterior segment tomographic image)
A method for acquiring an anterior ocular segment tomographic image using the above-described OCT apparatus that captures a tomographic image of the fundus of the eye to be examined will be described. For imaging, an anterior ocular segment imaging adapter 200 is attached in front of the objective lens 101. The anterior segment imaging adapter 200 is further used to capture a tomographic image of the anterior segment of the eye 100 to be examined. In use, the optical head incorporating at least a part of the tomographic imaging optical system and the anterior ocular segment observation optical system can be mounted at a position facing the eye 100 to be examined. The anterior segment imaging adapter 200 is combined with the OCT apparatus to construct an ophthalmic system.

  FIG. 3 is a cross-sectional view of the state in which the anterior eye imaging adapter 200 is mounted on the objective lens 101 as viewed from above. An anterior segment imaging objective lens 201 is disposed at the tip of the anterior segment imaging adapter 200. In addition, light guides 202a and 202b functioning as light guiding means are provided in the lens barrel of the anterior segment imaging adapter 200. The light guides 202a and 202b guide the illumination light from the anterior segment observation illuminations 105a and 105b to the vicinity of the anterior segment imaging objective lens 201 to illuminate the anterior segment of the eye 100 to be examined.

  More specifically, the light from the anterior segment illuminations 105a and 105b illuminates the subject's eye 100 through light guides 202a and 202b configured in the lens barrel of the anterior segment imaging adapter 200. The reflected light from the illumination of the eye 100 passes through the anterior segment imaging objective lens 201 and the objective lens 101, and further passes through the optical path L3 described above to be imaged on the CCD 112. The anterior segment image formed on the CCD 112 is read by a CCD control unit (not shown), subjected to amplification and A / D conversion, and then input to a calculation unit (not shown). The calculation unit rotates the image by 180 °. The anterior eye image input to the calculation unit is taken into the personal computer 925 and stored in the hard disk 926 or displayed on the monitor 928 as necessary.

  With respect to the OCT apparatus according to the present embodiment, a change in working distance between when the anterior segment imaging adapter 200 is not used and when it is used will be described with reference to FIG. The working distance described here is the distance between the OCT apparatus and the eye to be examined when a tomographic image is acquired by the OCT apparatus. More specifically, it corresponds to the distance between the front surface of the objective lens 101 disposed immediately before the eye 100 to be examined and the anterior eye.

  As shown in FIG. 4B, the working distance when the anterior segment imaging adapter 200 is used is a working distance WDa longer than the working distance WDr at the time of fundus imaging in FIG. 4A. The difference in the working distance is generated in order to match the imaging position of the anterior segment different from the fundus and the optical path length difference of the reference optical system. At the time of fundus photographing, the measurement light 150 scans around the pupil position of the eye to be examined with a pivot point. On the other hand, in order to obtain a required angle of view in the anterior eye part, it is necessary to separate the pivot point from the case of fundus photography. The anterior ocular segment imaging objective lens 201 is a lens having a power such that the measurement light emitting portion of the optical fiber 117-2 and the anterior ocular segment are substantially conjugated at the proper working distance WDa.

  FIG. 5 shows a conjugate relationship between the eye 100 to be examined and the anterior ocular segment observation optical system. FIG. 5A shows the relationship at the time of fundus imaging. The anterior segment of the eye 100 to be examined, the image split prism of the lens 110, and the CCD 112 are in a conjugate relationship. By establishing such a relationship, the anterior segment image can be clearly displayed on the CCD 112.

  On the other hand, FIG. 5B shows the relationship at the time of anterior segment imaging, but the conjugate relationship of the above-described anterior segment observation optical system due to the influence of the difference in working distance and the anterior segment imaging objective lens 201. Will collapse. Therefore, in the present embodiment, the lens 109 for image correction is inserted on the optical path L3. By inserting the imaging correction lens 109, it is possible to correct the optical position so that the anterior segment of the eye 100 to be examined, the image split prism of the lens 110, and the CCD 112 are in a conjugate relationship again. It becomes. In other words, by interposing the imaging correction lens 109, the imaging position of the anterior segment can be corrected, and the anterior segment image can be clearly displayed on the CCD 112 even during imaging of the anterior segment. It should be noted that when the anterior segment is imaged, the image of the anterior segment is reversed and displayed on the CCD 112 since the imaging is performed once more than when the fundus is captured. Therefore, as described above, an operation for rotating the image by 180 ° is added when the image is displayed.

  The OCT apparatus can acquire a tomographic image of a desired site in the anterior segment of the eye 100 by controlling the X scanner 114-1 and the Y scanner 114-2.

  FIG. 4B shows a state in which the anterior eye portion of the eye 100 to be examined is irradiated with the measurement light 150 and the anterior eye portion is scanned in the x direction. A line sensor 184 acquires information of a predetermined number of images from the imaging range in the x direction in the anterior segment of the eye 100 to be examined. The luminance distribution on the line sensor 184 obtained at a certain position in the x direction is subjected to a fast Fourier transform (FFT), and the linear luminance distribution obtained by the FFT is converted into density or color information in order to show on the monitor. This is called an A-scan image. That is, image acquisition as an A-scan image is performed according to the output signal obtained by the interference light received by the line sensor 184 as a light receiving element. A two-dimensional image in which the plurality of A-scan images are arranged is referred to as a B-scan image. After acquiring a plurality of A scan images for constructing one B scan image, the scan position in the y direction is moved and the scan in the x direction is performed again to obtain a plurality of B scan images. By displaying a plurality of B-scan images or a three-dimensional tomographic image constructed from a plurality of B-scan images on a monitor, the examiner can use it for diagnosis of the eye to be examined.

  In order to obtain the desired interference by combining the measurement light and the reference light, as described above, the optical path length of the measurement light and the optical path length of the reference light need to be linked so as to satisfy a predetermined condition. . Therefore, the reference mirror 119 is moved so as to change the optical path length of the reference light according to the optical path length of the measurement light at the position of the imaging region (for example, cornea, iris, etc.) of the anterior eye part.

(Measurement screen)
FIG. 6 shows a measurement screen 1000 displayed on the monitor 928.
The measurement screen 1000 includes a left / right eye switching button 1001, a mouse cursor 1002, a mode switching button 1004, an imaging button 1005, an anterior ocular segment observation screen 1101, a focusing slider 1203, a coherent gate position adjustment slider 1204, and a tomographic image display screen 1301. Is displayed.

  The anterior segment observation screen 1101 displays an anterior segment observation image obtained by the anterior segment observation CCD 112. The tomographic image display screen 1301 is a screen for displaying the acquired tomographic image in order to confirm it.

  The left / right eye switching button 1001 is a button for switching between the left and right eyes of the eye to be examined. By pressing the L and R buttons, the optical head 900 can be moved to the initial position of the left and right eyes. A mode switching button 1004 is a button for switching a photographing mode (fundus, anterior eye portion), and the photographing mode can be switched by pressing the button. The mouse cursor 1002 can move the display position of the mouse cursor 1002 on the measurement screen 1000 when the examiner operates the mouse included in the input unit 929.

  In this measurement apparatus, a cursor position detection unit (not shown) is arranged so that the alignment in the XY directions can be adjusted according to the position of the mouse cursor 1002 in the anterior eye observation screen 1101. The cursor position detecting means calculates the position from the pixel position on the display screen of the mouse cursor. Specifically, a predetermined range is provided in the measurement screen, and the correspondence between the provided range and the alignment drive amount is set in advance. As a result, when the mouse cursor is within the set range of pixels, the alignment determined by the set range can be performed.

  In addition, the Z-direction alignment operation with the mouse in the input unit 929 is preferably performed by, for example, rotating the mouse wheel. It is also possible to use a slider frame 1003 displayed in the anterior eye observation screen 1101. The slider frame 1003 represents the imaging position of the OCT in the X and Y directions, and the position of the optical head 900 can be changed by dragging the slider frame 1003 with the mouse cursor 1002.

  Also, the two sliders arranged in the vicinity of the tomographic image display screen 1301 are for adjusting apparatus parameters when acquiring a tomographic image in the OCT optical system. The focus slider 1203 is used to perform focus adjustment in the OCT apparatus. The OCT focus adjustment is an operation for adjusting the focus of the measurement light with respect to the anterior segment, and is an adjustment for moving the focusing lens 115 in the direction of the arrow shown in the drawing. A coherence gate adjustment slider 1204 is used to adjust the position of the reference mirror 119. The position adjustment of the reference mirror 119 is an adjustment for moving the reference mirror 119 in the direction of the arrow in the drawing in order to adjust the imaging region in the depth direction (Z direction) by changing the optical path length of the reference light. . Since there is a correlation between the imaging region in the depth direction and the focus position of the measurement light, the OCT focus adjustment and the reference mirror position adjustment may be linked.

  Next, a method for acquiring a tomographic image of the anterior segment of the eye 100 to be examined and a processing method using the OCT apparatus, which is a feature of the present embodiment, will be described with reference to FIGS. 2, 3, 6, and 7. . FIG. 7 is a flowchart showing the operations of the examiner and the personal computer 925.

  Hereinafter, the flowchart will be described with reference to FIG. In step S1, the anterior eye is selected by the mode switching button 1004, and an instruction to start measurement for the anterior eye is given. Here, the anterior eye photography is selected by the mode switching button 1004. However, when the anterior eye imaging adapter 200 is attached to the optical head 900 by the detection means, the anterior eye photography mode is automatically entered. May be. As the detection means (not shown), various sensors such as a known contact type sensor and an optical sensor can be used. In response to the instruction, the focusing lens 115 and the reference mirror 119 are moved to a preset initial position, and the imaging correction lens 109 is inserted on the optical path L3. The insertion of the imaging correction lens 109 into the optical path L3 is executed by a module area that functions as a control unit in the personal computer 925.

  In step S2, the personal computer 925 acquires the anterior eye image 1102 and displays it on the anterior eye observation screen 1101 as a moving image. In step S3, the operation of the mouse cursor 1002 or the like is performed on the anterior segment image to align the eye 100 to be examined with the apparatus, more specifically, the optical head 900. With respect to the working distance direction, if the alignment is shifted, the anterior segment image is broken and displayed at the upper and lower portions of the screen by the image split prism 110. Therefore, alignment is performed by operating the mouse so that the display on the upper and lower parts match.

  In step S4, the above-described slider frame 1003 is moved on the anterior eye observation screen 1101 by operating the mouse cursor 1002 or the like to set the tomographic image capturing position. Here, an example is shown in which a slider frame 1003 is positioned near the corner of the eye 100 to be examined. In step S5, the coherence gate adjustment slider 1204 is moved with the mouse cursor 1002 while viewing the tomographic image display screen 1301. By moving the reference mirror 119 in the optical axis direction through the operation, an imaging region in the depth direction within the frame is set. In step S6, the focus slider 1203 is moved by the mouse cursor 1203 while viewing the tomographic image display screen 1301. OCT focus adjustment is performed by moving the focusing lens 115 in the optical axis direction through the operation.

  In step S7, the imaging button 1005 is pressed to acquire a tomographic image of the anterior segment. In step S8, the acquired image is displayed, or the image is corrected and displayed.

  In step S2, the pupil position of the eye 100 to be examined and the anterior eye image that has been broken vertically are detected from the anterior eye image captured by the CCD 112, and the alignment positional relationship between the OCT apparatus and the eye 100 to be examined. I can know. For this reason, the optical head 900 may be driven by an XYZ stage (not shown) based on the anterior ocular segment image to perform auto alignment. According to the present embodiment, it is possible to always monitor the anterior segment of the eye 100 to be examined even during tomographic imaging.

  As described above, in the optical tomographic imaging apparatus (OCT apparatus) of this embodiment, the anterior ocular segment observation optical system uses the anterior ocular segment observation optical system when imaging the anterior ocular segment using the anterior ocular segment imaging adapter. An imaging correction lens is inserted in the optical path so that the eye part and the imaging means are substantially conjugate. Thereby, since the anterior ocular segment of the eye to be examined can be observed by the anterior ocular segment observation optical system, the operability of alignment can be improved.

(Other examples)
The present invention also provides a storage medium storing a program code of software for realizing the functions of the above-described embodiments (for example, processing shown by a flowchart in which the processing of each unit described above is associated with each step), a system or apparatus It can also be realized by supplying to. In this case, the function of the above-described embodiment is realized by the computer (or CPU or MPU) of the system or apparatus reading and executing the program code stored in the storage medium so as to be readable by the computer.

DESCRIPTION OF SYMBOLS 100 Eye to be examined 101 Objective lens 109 Lens for image formation correction 112 CCD camera 200 Adapter for anterior ocular segment imaging 201 Objective lens for anterior ocular segment imaging 202 Light guide 900 Optical head 925 Control unit 950 Stage unit 1000 Anterior segment measurement screen

Claims (10)

A tomographic imaging optical system for imaging a tomographic image of the fundus of the eye to be examined;
An anterior ocular segment observation optical system including an imaging means for imaging the anterior ocular segment of the eye to be examined;
An optical system that is built in the tomographic imaging optical system and the anterior ocular segment observation optical system, and that can be mounted at a position facing the eye to be inspected, for an anterior ocular segment imaging adapter used when capturing a tomographic image of the anterior ocular segment. Head,
An ophthalmologic apparatus comprising: an imaging position correction unit that is detachable from an optical path of the anterior ocular segment observation optical system and corrects an imaging position of the anterior ocular segment to be examined. The anterior ocular segment observation optical system has an anterior ocular segment illumination unit that illuminates the anterior ocular segment of the eye to be examined when the imaging unit images the anterior ocular segment,
The ophthalmologic apparatus according to claim 1, wherein when the tomographic image imaging optical system captures a tomographic image of the fundus of the eye to be examined, the anterior eye portion and the imaging unit are conjugated.   3. The anterior ocular segment imaging adapter includes a light guiding unit, and illumination light from the anterior segment illuminating unit illuminates the anterior segment of the eye to be examined through the light guiding unit. The ophthalmic device described.   The imaging position correction means corrects the imaging position by making the anterior eye part of the eye to be examined and the imaging means have a conjugate relationship when inserted in the optical path of the anterior ocular segment observation optical system. The ophthalmologic apparatus according to any one of claims 1 to 3. Detecting means for detecting attachment of the anterior eye imaging adapter to the optical head;
5. The apparatus according to claim 1, further comprising: a control unit that inserts the imaging position correction unit into the optical path when the detection unit detects the mounting of the anterior segment imaging adapter. The ophthalmic apparatus according to one item. A tomographic imaging optical system for imaging a tomographic image of the fundus of the eye to be examined;
An anterior ocular segment observation optical system for imaging the anterior ocular segment of the eye to be examined;
An optical head containing the tomographic imaging optical system and the anterior ocular segment observation optical system;
An imaging position correcting unit that is inserted into the optical path of the anterior ocular segment observation optical system when the tomographic image of the anterior ocular segment is captured by the tomographic imaging optical system; And an anterior ocular segment imaging adapter that can be mounted at a position facing the eye to be examined in the optical head when the tomographic image of the anterior ocular segment is captured by the tomographic imaging optical system. An ophthalmic system characterized by that. Detecting means for detecting attachment of the anterior eye imaging adapter to the optical head;
The ophthalmic system according to claim 6, further comprising: a control unit that inserts the imaging position correction unit into the optical path when the detection unit detects attachment of an anterior eye imaging adapter. . An anterior segment including a tomographic imaging optical system that captures a tomographic image of the fundus of the subject's eye, an anterior segment illuminating unit that illuminates the anterior segment of the subject's eye, and an imaging unit that captures the illuminated anterior segment A step of mounting an anterior ocular segment imaging adapter at a position facing the eye to be inspected with respect to an optical head incorporating an observation optical system;
Detecting the attachment of the anterior segment imaging adapter to the optical head;
A method of controlling an ophthalmologic apparatus, comprising: a step of inserting an imaging position correction unit that corrects an imaging position of the anterior ocular segment of the eye to be examined into an optical path of the anterior ocular segment observation optical system. When capturing a tomographic image of the fundus of the eye to be examined by the tomographic imaging optical system, the anterior eye portion and the imaging means are conjugate,
In a state where the anterior segment imaging adapter is attached, the imaging position correcting means is inserted into the optical path of the anterior segment observation optical system to conjugate the anterior eye portion to be examined and the imaging means. The method of controlling an ophthalmologic apparatus according to claim 8, wherein the imaging position is corrected based on the relationship.   A program for causing a computer to execute each step of the method for controlling an ophthalmic apparatus according to claim 8 or 9.

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