Tomographic image processing device and program

Abstract

To provide more effective information for showing an angle state of optometry.SOLUTION: A tomographic image processor includes a tomographic image acquisition part for acquiring multiple tomographic images containing the iridocorneal angle, acquired by redial scan centered at an approximate corneal apex, an analysis part for determining an analytic value related to the iridocorneal angle from each of the tomographic images, and a display processing part for correlating information on each analytic value acquired from each of the multiple tomographic images with a rotation angle in radial scan from which the iridocorneal angle corresponding to the analytic value is acquired, and for displaying the result on a display part.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a tomographic image processing apparatus and a program. [Background technology]

[0002] Conventionally, optical coherence tomography (OCT) is known, which acquires a three-dimensional image based on a tomographic image of a subject's eye. Patent Document 1 discloses a technique for evaluating the narrowness of the gap at the angle of the eye based on a tomographic image of the anterior segment of the eye. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-43814 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, the narrowness of the iridocorneal angle has been evaluated based on a tomographic image of the iridocorneal angle at a certain position. However, the narrowness of the iridocorneal angle may vary depending on the position, and it may not be possible to accurately estimate the state of the iridocorneal angle of the subject's eye based only on the state of the iridocorneal angle at a certain position.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide more effective information indicating the state of the angle of the eye to be examined. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention is a tomographic image processing device comprising: a tomographic image acquisition unit that acquires a plurality of tomographic images including an angle of iridocorneal rotation obtained by a radial scan centered approximately on the corneal apex; an analysis unit that determines an analytical value related to the angle of iridocorneal rotation from each of the plurality of tomographic images; and a display processing unit that displays information related to each analytical value obtained from each of the plurality of tomographic images on a display unit, in association with the rotation angle in the radial scan at which the angle of iridocorneal rotation corresponding to the analytical value was obtained.

[0007] Another aspect of the present invention is a program for causing a computer to function as a tomographic image acquisition unit that acquires multiple tomographic images including the corneal angle obtained by a radial scan centered approximately on the corneal apex, an analysis unit that determines an analytical value related to the corneal angle from each of the multiple tomographic images, and a display processing unit that displays information related to each analytical value obtained from each of the multiple tomographic images on a display unit, in association with the rotation angle in the radial scan at which the corneal angle corresponding to the analytical value was obtained.

[0008] In this way, according to the present invention, information about analytical values ​​obtained from multiple tomographic images scanned at different positions in the circumferential direction around the corneal apex is displayed on the display unit in association with the rotation angle in the circumferential direction. This provides more effective information indicating the state of the corneal angle of the subject's eye. Therefore, the user can grasp the state of the corneal angle of the subject's eye in relation to the position of the corneal angle. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a configuration diagram of an ophthalmologic apparatus. [Figure 2] FIG. 1 is a diagram showing a scanning-alignment optical system. [Figure 3] FIG. 2 is a configuration diagram of a control unit. [Figure 4] FIG. 10 is an explanatory diagram of radial scanning. [Figure 5] FIG. 1 is an explanatory diagram of AOD500. [Figure 6] 10 is a flowchart showing an angle evaluation process. [Figure 7] FIG. 10 is a diagram showing a display example of an evaluation result screen. [Figure 8] FIG. 10 is a diagram showing a display example of an evaluation result screen. [Figure 9] FIG. 10 is a diagram showing a display example of a tomographic image screen. [Figure 10] FIG. 10 is an explanatory diagram of analytical values ​​according to another example. DETAILED DESCRIPTION OF THE INVENTION

[0010] An ophthalmic apparatus 1 according to this embodiment will be described below. The ophthalmic apparatus 1 is an optical coherence tomography apparatus that obtains a tomographic image of the anterior segment of a subject's eye by optical coherence tomography. FIG. 1 is a diagram showing the overall configuration of the ophthalmic apparatus 1. The ophthalmic apparatus 1 mainly includes a wavelength swept light source 10, an SMFC (single-mode fiber coupler) 101, an OCT interference system 100, an interference optical system 400 for generating a k-clock, and a control unit 500. Here, the control unit 500 is an example of a tomographic image processing device.

[0011] The OCT interferometer 100 is an optical system for obtaining a tomographic image of the anterior segment of a subject's eye using optical coherence tomography. In this embodiment, an example will be described in which swept source-OCT (SS-OCT) is used as the optical coherence tomography. The swept light source 10 is a light source that outputs light while scanning by changing the wavelength over time. For example, a light source capable of achieving high-speed scanning at 50 kHz or higher, with a central wavelength of 1 μm or more and a sweep width of 70 nm or more, is used as the swept light source 10. The light emitted from the swept light source 10 is guided by an optical fiber such as a single-mode fiber and is used to capture a tomographic image of a sample 20 and also to generate a k-clock. The ophthalmic apparatus 1 of this embodiment captures an image of the anterior segment of a subject's eye as the sample 20.

[0012] The light emitted from the wavelength swept light source 10 is split by the SMFC 101 and enters the OCT interference system 100 and the k-clock generating interference optical system 400 .

[0013] The OCT interferometer 100 includes SMFCs 102 and 103, a measurement-side circulator 104, a reference-side circulator 105, a balanced detector 110, a polarization controller 120, a scanning-alignment optical system 200, and a reference optical system 300. One of the incident beams split by the SMFC 101 is further split by the SMFC 102, and the other beam enters the scanning-alignment optical system 200 and the other beam enters the reference optical system 300.

[0014] One of the beams branched by SMFC 102 enters scanning-alignment optical system 200 via measurement-side circulator 104. Measurement-side circulator 104 is an optical element disposed between SMFC 102, scanning-alignment optical system 200, and SMFC 103. Scanning-alignment optical system 200 is an optical system that irradiates incident light onto sample 20 and guides reflected light from sample 20 to SMFC 103 via measurement-side circulator 104. Details of scanning-alignment optical system 200 will be described later with reference to FIG. 2.

[0015] The other light branched by the SMFC 102 enters the reference optical system 300 via the reference-side circulator 105. The reference-side circulator 105 is an optical element disposed between the SMFC 102, the reference unit 301, and the SMFC 103. The reference optical system 300 is provided with a reference unit 301 that converts incident light into reference light. In this embodiment, the reference unit 301 is a prism that emits the incident light as reference light. The reference unit 301 is provided movably so that the optical path length of the scanning-alignment optical system 200 and the optical path length of the reference optical system 300 match before measuring the sample 20. Note that the position of the reference unit 301 is fixed during measurement of the sample 20.

[0016] The light incident on the reference optical system 300 is converted into reference light by the reference unit 301 and is guided to the SMFC 103 via the reference-side circulator 105 and the polarization controller 120. The polarization controller 120 is an element that controls the polarization of the reference light guided from the reference optical system 300 to the SMFC 103. The polarization controller 120 can be of various types, such as an in-line type or a paddle type.

[0017] The SMFC 103 generates interference measurement light by combining the reflected light guided from the scanning-alignment optical system 200 and the reference light guided from the reference optical system 300. The SMFC 103 also splits the combined interference measurement light into two interference measurement lights with a phase difference of 180°, and guides them to the balanced detector 110.

[0018] The balanced detector 110 receives the measurement interference light and outputs a measurement interference signal, which is input to the control unit 500. The control unit 500 performs arithmetic processing to generate a tomographic image of the sample 20 from the measurement interference signal.

[0019] 2 shows the configuration of the scanning-alignment optical system 200. The scanning-alignment optical system 200 includes a scanning optical system, an anterior eye imaging system, a fixation target optical system, and an alignment optical system.

[0020] The scanning optical system is an optical system for obtaining tomographic images. In the scanning optical system, light traveling from the measurement-side circulator 104 through an optical fiber passes through a collimator lens 201 and enters a galvanometer scanner 202. The galvanometer scanner 202 is a device for scanning the incident light and is driven by a galvanometer driver (not shown). The light traveling through the galvanometer scanner 202 is reflected at a 90° angle by a hot mirror 203 and passes through an objective lens 204 before entering the subject's eye E. The light incident on the subject's eye E is reflected by various tissues in the anterior segment Ec (cornea, anterior chamber, iris, crystalline lens, etc.) to become measurement light. The measurement light then passes through the objective lens 204, hot mirror 203, galvanometer scanner 202, and collimator lens 201 in this order, in the reverse order, and is guided to the SMFC 103 via the measurement-side circulator 104.

[0021] In the SMFC 103, the reflected light (measurement light) from the anterior segment Ec and the reference light are combined, and the resulting signal is input to the balanced detector 110. In the balanced detector 110, interference for each wavelength is measured, and the measured measurement interference signal is input to the control unit 500. The control unit 500 performs processing such as an inverse Fourier transform on the measurement interference signal, and acquires a tomographic image of the anterior segment Ec along the scanning line.

[0022] The anterior eye imaging system is an imaging system for obtaining a two-dimensional image of the anterior eye. The anterior eye imaging system includes illumination light sources 205a and 205b, an objective lens 204, a hot mirror 203, a beam splitter 206, an imaging lens 207, and an area sensor 208. The illumination light sources 205a and 205b irradiate the front of the subject's eye E with illumination light in the visible light range. The illumination light is reflected by the subject's eye E, and the reflected light passes through the objective lens 204, the hot mirror 203, the beam splitter 206, and the imaging lens 207 and is guided to the area sensor 208. In this way, a front image of the anterior eye of the subject's eye E is captured, and the captured front image is input to the control unit 500. Here, the front image is a two-dimensional image of the anterior eye viewed from the optical axis direction of the reflected light, with the left and right of the subject defined as the left-right direction of the image and the up and down direction of the subject defined as the vertical direction.

[0023] The fixation target optical system is an optical system that keeps the subject's eyeball (eye E) from moving as much as possible by having the subject gaze at a fixation lamp. The fixation target optical system includes a fixation target light source 210, a variable focus movable lens 211, a cold mirror 212, a hot mirror 213, a relay lens 214, a beam splitter 215, a beam splitter 206, a hot mirror 203, and an objective lens 204. Light emitted from the fixation target light source 210 passes through the variable focus movable lens 211, the cold mirror 212, the hot mirror 213, the relay lens 214, the beam splitter 215, the beam splitter 206, the hot mirror 203, and the objective lens 204 in this order, before reaching the eye E.

[0024] Here, the variable-focus movable lens 211 is configured to be movable so that the focus of the fixation target can be freely varied. For example, the variable-focus movable lens 211 can be moved so that the focus of the fixation target is at the position of the refractive power value of the subject's eye E, thereby enabling the subject to have natural vision (a state in which no load is applied to the crystalline lens).

[0025] The alignment optical system is an optical system for aligning the subject's eye E. Although not shown, the ophthalmologic apparatus 1 includes an apparatus main body and a support stand that supports the apparatus main body. A chin rest on which the subject places their chin and a forehead rest on which the subject places their forehead are fixedly provided on the front side (subject side) of the apparatus main body. When the subject places their forehead on the forehead rest, the subject's eye (subject's eye E) is positioned directly in front of an examination window provided on the front side of the apparatus main body.

[0026] Furthermore, the device body is supported movably in the X, Y, and Z directions relative to the support base. The device body can be moved in each of the X, Y, and Z directions relative to the support base under the control of the control unit 500. Here, the X direction corresponds to the left-right direction of the device body and corresponds to the left-right direction of the head of the subject fixed to the device. The Y direction corresponds to the up-down direction of the device body and corresponds to the up-down direction of the subject fixed to the forehead support or the like. The Z direction corresponds to the depth direction of the device body and corresponds to the front-back direction of the subject fixed to the forehead support or the like. In the examination of the subject's eye E, it is necessary to move the device body so that the subject's eye E is set at a predetermined position on the device body, and the alignment optical system is an optical system for determining the amount of movement of the device body.

[0027] The alignment optical system includes an XY-direction position detection system and a Z-direction position detection system. The XY-direction position detection system is configured to detect the position of the subject's eye E (corneal apex) in the XY directions (up / down and left / right deviations relative to the device body). The Z-direction position detection system is configured to detect the front-to-back position of the subject's eye E (corneal apex) (deviations in the Z direction).

[0028] The XY direction position detection system includes an XY position detection light source 216, a hot mirror 213, a relay lens 214, a beam splitter 215, a beam splitter 206, a hot mirror 203, an objective lens 204, an imaging lens 217, and a two-dimensional position sensor 218. Alignment light for position detection emitted from the XY position detection light source 216 reaches the anterior segment Ec (cornea) of the subject's eye E via the hot mirror 213, the relay lens 214, the beam splitter 215, the beam splitter 206, the hot mirror 203, and the objective lens 204.

[0029] Because the corneal surface of the subject's eye E is spherical, the alignment light is reflected by the corneal surface so as to form a bright spot image inside the corneal apex of the subject's eye E. The light reflected by the corneal surface is guided to the objective lens 204. The light reflected by the corneal apex is input to the two-dimensional position sensor 218 via the objective lens 204, hot mirror 203, beam splitter 206, beam splitter 215, and imaging lens 217. The two-dimensional position sensor 218 detects the position of the bright spot as the position of the corneal apex (position in the X and Y directions).

[0030] The detection signal of the two-dimensional position sensor 218 is input to the control unit 500. In this embodiment, the position where the corneal apex should be located when alignment is performed between the two-dimensional position sensor 218 and the anterior eye imaging system is preset as the normal position in the control unit 500. This normal position of the corneal apex is the position to be tracked when acquiring a tomographic image, such as the center position of the image captured by the imaging element. Based on the detection of the two-dimensional position sensor 218, the control unit 500 calculates the amount of positional deviation in the X and Y directions between the normal position and the detected corneal apex (bright spot).

[0031] The Z direction position detection system includes a Z position detection light source 219, an imaging lens 220, and a line sensor 221. The Z position detection light source 219 irradiates the subject's eye E with detection light (slit light or spot light) from an oblique direction. The irradiated light is reflected obliquely by the cornea, and the reflected light is guided to the line sensor 221 via the imaging lens 220. The incident position of the reflected light incident on the line sensor 221 differs depending on the position of the subject's eye E in the anterior-posterior direction (Z direction), and therefore the Z direction position of the subject's eye E is detected.

[0032] The control unit 500 moves the device body relative to the holding table so that the positional deviation amounts in the X and Y directions of the corneal apex (bright spot) detected by the XY direction position detection system and the positional deviation amount of the subject's eye E detected by the Z direction position detection system are all set to 0. This completes the alignment.

[0033] 1 is a device that optically generates a sample clock (k-clock) from input light branched from the SMFC 101 in order to sample the measurement interference signal at equally spaced frequencies. The k-clock signal generated by the k-clock generating interference optical system 400 is input to the control unit 500. By having the control unit 500 refer to the k-clock signal, distortion of the measurement interference signal is suppressed, preventing a deterioration in resolution.

[0034] 3 is a configuration diagram of the control unit 500. The control unit 500 includes a control unit 510, a recording medium 520, a display unit 530, and an operation unit 540. The control unit 510 includes a CPU, a ROM, and a RAM (not shown). The control unit 510 performs various processes by executing programs stored in the recording medium 520. The control unit 510 controls, for example, each control object included in the OCT interferometer 100, the scanning-alignment optical system 200, the reference optical system 300, and the k-clock generating interference optical system 400, such as the alignment motor and the area sensor 208. The control unit 510 also generates (acquires) a tomographic image based on information output from the OCT interferometer 100, the scanning-alignment optical system 200, etc.

[0035] The recording medium 520 stores various programs and various data. The display unit 530 displays various information. The display unit 530 displays, for example, a tomographic image or a front image of the anterior segment of the eye. The operation unit 540 accepts input from a user. The operation unit 540 is, for example, a keyboard or a mouse. As another example, the operation unit 540 may be a touch panel provided integrally with the display unit 530.

[0036] The control unit 510 executes a program stored in the recording medium 520, thereby functioning as a tomographic image acquisition unit 511, a front image acquisition unit 512, an analysis unit 513, a display processing unit 514, and a reception unit 515. In other words, hereinafter, the processes described as being performed by the tomographic image acquisition unit 511, the front image acquisition unit 512, the analysis unit 513, the display processing unit 514, and the reception unit 515 are actually processes executed by the control unit 510 (CPU).

[0037] The tomographic image acquisition unit 511 acquires a measurement interference signal by controlling the OCT interferometer 100, the scanning-alignment optical system 200 (such as the galvanometer scanner 202), and the k-clock generating interference optical system 400. Then, the tomographic image acquisition unit 511 performs processing such as an inverse Fourier transform on the measurement interference signal to acquire a tomographic image of the anterior segment Ec along the scanning line.

[0038] The tomographic image acquisition unit 511 changes the scanning direction of the galvano scanner 202 to acquire tomographic images of multiple slice planes. In this embodiment, the tomographic image acquisition unit 511 performs radial scanning as shown in FIG. 4. In radial scanning, the radial direction centered on the corneal apex of the subject's eye E is the B-scan direction, and the circumferential direction of the anterior segment surface of the subject's eye E is the C-scan direction, and two-dimensional tomographic images of each slice plane are acquired. Note that the center of the radial scan does not need to strictly coincide with the corneal apex. As another example, the center of the radial scan may be a position that approximately coincides with the corneal apex, such as the pupil center or the corneal center. The tomographic image thus acquired includes two angles of the anterior segment Ec. Radial scanning acquires multiple tomographic images that form a three-dimensional image of the anterior segment of the subject's eye E. In this embodiment, 18 tomographic images are acquired at 10° intervals. Note that the interval at which the tomographic images are acquired is not limited to the embodiment. In this way, the tomographic image acquisition unit 511 acquires a plurality of tomographic images including the iridocorneal angle in different radial directions with the corneal apex as the center.

[0039] In this embodiment, the measurement position, which is the position of the tomographic image in the radial scan where the iridocorneal angle is obtained, is expressed as a rotation angle from a predetermined position on a circle centered on the corneal apex. In this embodiment, the right side of the anterior segment in the front image is referred to as a rotation angle of 0°, the upper side as a rotation angle of 90°, the left side as a rotation angle of 180°, and the lower side as a rotation angle of 270°.

[0040] After the alignment is completed, the front image acquisition unit 512 controls the anterior eye imaging system (such as the area sensor 208) to acquire a front image of the anterior eye that is within the field of view of the anterior eye imaging system. Here, the field of view of the anterior eye imaging system refers to the range corresponding to the area sensor 208. In this embodiment, the position of each pixel in the tomographic image and the position of each pixel in the front image are both associated with a position in the XYZ space based on the position of the device body. Therefore, the positional correspondence between each tomographic image and the front image can be determined by the pixel positions of both images.

[0041] The analysis unit 513 calculates an analytical value related to the iridocorneal angle from each of the multiple tomographic images. Here, the analytical value is an evaluation value used in analysis to detect eye abnormalities. More specifically, the analytical value is an evaluation value used to evaluate the degree of narrowing of the iridocorneal angle. In this embodiment, the AOD (angle opening distance) 500 value is calculated as the analytical value related to the iridocorneal angle. The AOD 500 is the distance of a line segment extending vertically from a point 500 μm from the scleral promontory to the iris at the posterior (iris side) boundary of the cornea. In other words, the AOD 500 is an example of the distance between the cornea and the iris at a predetermined position relative to the position of the scleral promontory. Note that the predetermined position is not limited to a position 500 μm from the scleral promontory, and may alternatively be a distance of 250 μm. In FIG. 5, the AOD 500 is indicated by a white line. Note that FIG. 5 is a diagram showing a tomographic image illustrating the vicinity of the iridocorneal angle.

[0042] The smaller the AOD500 value, the narrower the angle. The analysis unit 513 comprehensively determines the degree of narrowness of the angle based on the AOD500 values ​​at each of the multiple positions. Details of the processing by the analysis unit 513 will be described later with reference to Figure 6, etc.

[0043] Diseases that cause the angle to narrow include PACS (suspected primary angle-closure disease), PAC (primary angle-closure disease), PACG (primary angle-closure glaucoma), acute glaucoma attack, acute primary angle-closure glaucoma, and secondary glaucoma (1. caused by peripheral anterior synechiae that occur regardless of the anterior chamber depth, or 2. direct angle closure due to anterior movement of the iris-lens due to causes other than pupillary block). For example, primary angle-closure disease is a condition in which the angle is narrow. In angle-closure glaucoma, the angle is narrow, increasing resistance to aqueous humor outflow, causing intraocular pressure to rise and optic nerve damage to develop. In an acute glaucoma attack, the angle and iris become blocked, preventing aqueous humor from outflow and resulting in a sudden rise in intraocular pressure.

[0044] The display processing unit 514 displays various types of information on the display unit 530. The receiving unit 515 receives instructions in response to user operations on the operation unit 540, and the like.

[0045] The recording medium 520 stores an AOD500 threshold table 521. The AOD500 threshold table 521 indicates the AOD500 threshold for each measurement position where the iridocorneal angle is obtained. The AOD500 threshold is an index value for determining whether the iridocorneal angle is narrow, and is an example of a distance threshold. When the AOD500 calculated in the tomographic image of the subject's eye E is less than the AOD500 threshold, the iridocorneal angle is determined to be narrow. It is known that the width of the iridocorneal angle varies depending on the position (rotation angle) of the iridocorneal angle. For example, the iridocorneal angle on the upper side of the anterior segment (e.g., rotation angle 90°) is narrower than the iridocorneal angles on the left and right sides of the anterior segment (e.g., rotation angles 0° and 180°). Accordingly, in the AOD500 threshold table 521 of this embodiment, the AOD500 threshold for each measurement position (rotation angle) of the iridocorneal angle is predetermined. Each AOD500 threshold in the AOD500 threshold table 521 is preferably a value determined by statistical analysis of AOD500 values ​​actually measured in the anterior segments of many normal eyes known to have open angles. For example, the 10th percentile value or the 5th percentile value of AOD500 measured in normal eyes may be determined as the AOD500 threshold.

[0046] 6 is a flowchart showing the iridocorneal angle evaluation process performed by the control unit 510. The iridocorneal angle evaluation process is a process for evaluating the narrowness of the iridocorneal angle by image processing of a tomographic image. Note that in the iridocorneal angle evaluation process, a tomographic image and a front image are acquired, but it is assumed that alignment in the scanning-alignment optical system has been completed before these images are acquired.

[0047] In the iridocorneal angle evaluation process, first, the tomographic image acquisition unit 511 of the control unit 510 acquires a plurality of tomographic images that constitute a three-dimensional image (S100). Specifically, the tomographic image acquisition unit 511 acquires a plurality of tomographic images that constitute a three-dimensional image of the anterior segment while changing the scanning direction of the galvano scanner 202. In this embodiment, 18 tomographic images are obtained by radial scanning at 10° intervals. Next, the front image acquisition unit 512 controls the anterior segment imaging system to acquire a front image (S102).

[0048] Next, the analysis unit 513 measures the AOD500 value for each of the two iridocorneal angles included in each tomographic image obtained in S100 (S104). To measure the AOD500, the analysis unit 513 first identifies the position of the scleral promontory. Hereinafter, the position of the scleral promontory will be referred to as the SS position. The SS position is used to calculate the AOD500 value. Specifically, the analysis unit 513 first extracts an image near the iridocorneal angle from the tomographic image. As a result, an image such as that shown in FIG. 5 is extracted. Hereinafter, the extracted image will be referred to as a local image. The analysis unit 513 detects a corneal posterior surface edge line 600 and an iris anterior surface edge line 602 in the local image based on the brightness gradient. The corneal posterior surface edge line 600 is an edge line corresponding to the surface of the cornea facing the iris. The iris anterior surface edge line 602 is an edge line corresponding to the surface of the iris facing the cornea. These edge detections are performed by comparing the brightness gradient with a threshold value.

[0049] The analysis unit 513 identifies a sclera-uvea edge line 606 based on the magnitude of the brightness gradient, using as a reference the curvature point (corresponding to the base of the iridocorneal angle 604) of the edge line formed by connecting the posterior corneal edge line 600 and the anterior iris edge line 602. Here, the sclera-uvea edge line 606 is an edge line corresponding to the boundary between the sclera and the uvea.

[0050] Then, the analysis unit 513 identifies the intersection of the sclera-uvea edge line 606, the corneal posterior surface edge line 600, and the iris anterior surface edge line 602 as the SS position 610. The analysis unit 513 may use, for example, the technology described in Japanese Patent Application Laid-Open No. 2015-66084 as the process for identifying the SS position 610.

[0051] It should be noted that the analysis unit 513 may identify the SS position based on the tomographic image, and the specific processing therefor is not limited to that of this embodiment. As another example, the analysis unit 513 may identify the SS position using an SS position estimation model. In this case, the correct image in which the SS position has been identified is used for testing to learn (generate) the SS position estimation model, and this model is stored in the recording medium 520. As another example, the tomographic image may be displayed on the display unit 530, and the SS position may be specified by the user. In this case, the analysis unit 513 may measure the AOD 500 based on the SS position specified by the user.

[0052] Next, the analysis unit 513 classifies the iridocorneal angle obtained at each measurement position into multiple iridocorneal angle levels (S106). Here, the iridocorneal angle level is a level set according to the width of the iridocorneal angle. In this embodiment, the iridocorneal angle levels include three levels, in order of decreasing width: open iridocorneal angle, narrow iridocorneal angle, and closed iridocorneal angle. The analysis unit 513 classifies the iridocorneal angle at each measurement position into multiple iridocorneal angle levels by comparing the AOD500 of the iridocorneal angle at each measurement position with the AOD500 threshold for that position. The AOD500 threshold for each measurement position uses a value stored in the AOD500 threshold table 521. For example, the AOD500 of an iridocorneal angle with a rotation angle of 30° is compared with the AOD500 threshold associated with a rotation angle of 30°. In this embodiment, the analysis unit 513 determines the iridocorneal angle level as an open iridocorneal angle if the AOD500 value is equal to or greater than the AOD500 threshold. If the AOD500 value is smaller than the AOD500 threshold and is not zero, the analysis unit 513 determines the angle level to be a narrow angle. If the AOD500 value is zero, the analysis unit 513 determines the angle level to be a closed angle. The angle level is an example of information related to the AOD500 as an analysis value.

[0053] The analysis unit 513 then determines a comprehensive evaluation value based on the angle level at each measurement position (S108). The comprehensive evaluation value is an evaluation value that comprehensively evaluates the degree of narrowness of the angle in the anterior segment Ec. In this embodiment, the comprehensive evaluation value includes a narrow angle-closure ratio, a narrow angle-closure ratio, and an angle-closure ratio.

[0054] The narrow angle ratio is the ratio of narrow angles obtained among all angles corresponding to all measurement positions. As described above, assume that 18 of the 24 positions were narrow angles. In this case, the analysis unit 513 determines that narrow angles are 60% (18 / 24). The closed angle ratio is the ratio of closed angles obtained among all angles. Assume that three positions were closed angles. In this case, the analysis unit 513 determines that closed angles are 12.5% ​​(3 / 24). The narrow / closed angle ratio is the ratio of narrow and closed angles obtained among all angles. Assume that 18 positions were narrow angles and 3 positions were closed angles. In this case, the analysis unit 513 determines that the narrow / closed angle ratio is 87.5% (21 / 24).

[0055] In this way, the comprehensive evaluation value is a value that is evaluated comprehensively based on the analysis results obtained over the entire angle, not just the degree of narrowness of the angle at a certain point. Therefore, by referring to the comprehensive evaluation value, a doctor can more accurately assess the condition of the angle than if the condition were assessed based on the narrowness of the angle at a certain position.

[0056] Next, the display processing unit 514 displays an evaluation result screen on the display unit 530 (S110). Fig. 7 is a diagram showing a display example of an evaluation result screen 700. The evaluation result screen 700 is provided with a chart area 710, a tomographic image area 720, a front image area 730, and an overall evaluation area 740.

[0057] A circular chart is displayed in the chart area 710. The chart corresponds to the anterior segment, and its center corresponds to the corneal apex. Each position in the circumferential direction of the chart indicates a position (rotation angle) on the surface of the anterior segment, and radial lines (straight lines extending in the radial direction) extending from the center of the chart are axes indicating the AOD500 value. The AOD500 value increases as the distance from the center increases. Measurement results 712 indicating the AOD500 value at each measurement position obtained in S104 are displayed on the chart. In addition, an AOD500 threshold value 714 for each measurement position is displayed. Note that in the example of FIG. 7, no AOD500 value is obtained in the rotation angle ranges of 20° to 110° and 200° to 310°, and therefore measurement results 702 are not displayed in these ranges.

[0058] The background of the chart is colored in a color indicating the angle level at each measurement position. For example, the ranges corresponding to open angles, narrow angles, and closed angles are colored green, yellow, and red, respectively. In this way, the display processor 514 displays the ranges corresponding to the measurement positions where the angle level was obtained in a color indicating the angle level. Here, the ranges corresponding to the measurement positions where the angle level was obtained are a range of 5° in both the positive and negative directions from the measurement position (rotation angle). Note that the ranges corresponding to the measurement positions where the angle level was obtained may be any predetermined angular range including the measurement positions where the angle level was obtained, and are not limited to the embodiment. In this way, the background of the chart is colored in a color corresponding to the angle level, allowing the user to visually easily grasp the angle level at each measurement position. Furthermore, the AOD500 value and background color are displayed on the chart, allowing the user to associate the AOD500 value with the angle level. Note that the background color of the chart indicates the angle level at each measurement position of the angle. That is, the process in which the display processing unit 514 displays the range of the chart background corresponding to each measurement position by coloring it with the color of the angle level at each position is an example of a process in which the angle level is displayed in correspondence with the measurement position.

[0059] In the tomographic image area 720, thumbnails of the iridocorneal angles corresponding to each measurement position are displayed along the measurement positions of the iridocorneal angles on the chart. Each thumbnail corresponds to a tomographic image obtained in S100. The SS position 721 is indicated on each thumbnail. This allows the user to check the measurement results of the AOD500, the iridocorneal angle level of the tomographic image represented by color, and the tomographic image on which these results were obtained. In the example shown in FIG. 7, thumbnails of iridocorneal angles at 12 equally spaced positions out of all the positions obtained in S100 (36 positions) are displayed. It is not necessary to display thumbnails corresponding to all tomographic images in this way. Furthermore, the number of thumbnails displayed in the tomographic image area 720 is not limited to the embodiment.

[0060] The front image area 730 displays the front image of the anterior segment acquired in S102. Furthermore, a point 731 indicating the SS position is superimposed on the front image. The display processing unit 514 sets a position in the front image corresponding to the measurement position (rotation angle) at which the iridocorneal angle was obtained, with the corneal apex as the center. The display processing unit 514 then displays the mark 731 superimposed on the front image at a position corresponding to the SS position obtained at the iridocorneal angle on a radial line extending in the direction of the rotation angle according to the iridocorneal angle position. The value obtained by the analysis unit 513 when calculating the AOD500 in S104 is used as the SS position. In this way, marks indicating the SS positions corresponding to each of the multiple iridocorneal angles are superimposed on the front image. The mark 731 may have a color indicating the iridocorneal angle level and a shape indicating the SS position, and is not limited to a point. The mark 731 may have a shape other than a point, such as an x.

[0061] Furthermore, each mark 731 superimposed on the front image is displayed in a color corresponding to the iridocorneal angle level identified at each measurement position (rotation angle). That is, the process in which the display processing unit 514 superimposes and displays, on the front image, a mark 731 colored in a color indicating the iridocorneal angle level obtained at each measurement position at a position corresponding to the iridocorneal angle, is an example of a process in which the iridocorneal angle level is displayed in association with the measurement position. In this way, each mark 731 is displayed at the SS position in a color indicating the iridocorneal angle level, allowing the user to visually easily grasp the relationship between the SS position and the iridocorneal angle level obtained at the SS position.

[0062] Furthermore, for example, if an SS position outside the approximate circle (ellipse) corresponding to the entire circumference of the SS position, which is estimated from the multiple SS positions, is identified, the mark 731a is placed at a position outside the approximate circle. Therefore, the user can easily understand that the SS position corresponding to the mark 731a is likely to be an incorrect value. In this way, the user can appropriately determine whether the SS position for each angle has been appropriately identified by referring to the SS positions of each of the multiple angles. The user can also determine whether the SS position is correct based on the SS position and the position of the cornea shown in the front image.

[0063] The overall evaluation area 740 displays the overall evaluation value obtained in S108. In this embodiment, a narrow angle-closure ratio 741 is displayed as the overall evaluation value. At this time, the narrow angle-closure ratio 741 is displayed in a manner that allows the user to distinguish between values ​​of 25% or greater and values ​​less than 25%. For example, values ​​greater than 25% are displayed in red, and values ​​less than 25% are displayed in green. For example, as in the example of FIG. 7 , if the angle at each rotation angle is determined to be an open angle, the open angle is displayed in green, and a narrow angle-closure ratio of 0% is displayed in green. The overall evaluation area 740 also displays a narrow angle ratio 742 and an angle-closure ratio 743. A high narrow angle-closure ratio 741 indicates a high possibility of angle-closure disease. Therefore, in this embodiment, 25% is set as a threshold, and values ​​greater than or equal to this threshold are displayed in red to alert the user. Note that the threshold may be any preset value and is not limited to 25%.

[0064] In this way, the comprehensive evaluation area 740 displays not only the angle level at a certain measurement position, but also a comprehensive evaluation value of the narrowness of the angle determined based on the angle levels at each of multiple measurement positions, thereby providing information for a comprehensive diagnosis by a doctor that takes into account the angle levels at multiple circumferential positions.

[0065] In this embodiment, the display processing unit 514 displays the narrow angle-closure ratio as the overall evaluation value. However, the overall evaluation value is not limited to the narrow angle-closure ratio. As another example, the display processing unit 514 may display the angle-closure ratio and the open angle ratio as the overall evaluation value. The display processing unit 514 may display at least one of the narrow angle-closure ratio, the angle-closure ratio, and the open angle ratio as the overall evaluation value.

[0066] 8 is a diagram showing an example of an evaluation result screen 800 showing a result where the narrow angle-closure rate is 100%. In the results shown on the evaluation result screen 800, the AOD500 at each rotation angle is smaller than the AOD500 threshold value.

[0067] The explanation will return to FIG. 6. After displaying the evaluation result screen in S110, the reception unit 515 determines whether or not the iridocorneal angle at one measurement position has been selected by the user's operation of the operation unit 540 (S112). If the iridocorneal angle has not been selected (N in S112), the reception unit 515 proceeds to S116. If the iridocorneal angle has been selected (Y in S112), the reception unit 515 proceeds to S114. The iridocorneal angle is selected by the user's operation using the operation unit 540.

[0068] In this case, an example of a user operation is the selection of a mark on the front image. If there is a mark located at a position that is shifted from the approximate circle estimated from multiple marks, the user can select that mark as a target for correcting the SS position. Note that the user operation for selecting the corner angle is not limited to the embodiment. Other examples of user operations include the selection of a thumbnail and the selection of a position on the chart that corresponds to the rotation angle. However, the user operation is not limited to the embodiment.

[0069] In S114, the display processing unit 514 displays a tomographic image of the selected angle. Specifically, the display processing unit 514 displays a tomographic image screen including a tomographic image. FIG. 9 is a diagram showing a display example of a tomographic image screen 900. A tomographic image 910 is displayed on the tomographic image screen 900. An x mark indicating the SS position is displayed on the tomographic image 910. The user can confirm this SS position and correct the SS position as necessary. To correct the SS position, the user performs an operation using the operation unit 540, such as moving the x mark on the tomographic image 910 or inputting the coordinates of the SS position. This allows an instruction to correct the SS position to be input. The correction instruction includes the corrected SS position. The tomographic image displayed in S114 is sufficient as long as it includes at least the angle selected by the user, and does not have to be an image of the entire tomographic image.

[0070] Returning to FIG. 6 for the explanation, after displaying the tomographic image screen in S114, the reception unit 515 determines whether or not an instruction to correct the SS position has been received through a user operation (S116). If the reception unit 515 has not received an instruction to correct the SS position (N in S116), the reception unit 515 terminates the tomographic image processing. If the reception unit 515 has received an instruction to correct the SS position (Y in S116), the processing proceeds to S118. In S118, the analysis unit 513 corrects the SS position in accordance with the corrected SS position indicated in the correction instruction. Next, the analysis unit 513 measures the AOD500 based on the corrected SS position (S120). Next, the analysis unit 513 identifies the angle level based on the value of the AOD500 calculated in S118 (S122). Next, the analysis unit 513 determines the overall evaluation value using the AOD500 value obtained from the SS position related to the change instruction and the iridocorneal angle level (S124).

[0071] Thereafter, the display processing unit 514 updates the display based on the values ​​obtained in S118 to S124 (S126). Specifically, the display processing unit 514 updates the SS position on the tomographic image screen. Also, if the AOD500 value is displayed on the tomographic image screen, it updates this. Furthermore, when the display is switched to the evaluation result screen in response to a user operation, the display processing unit 514 updates the AOD500 value and background color displayed in the chart area 710 on the evaluation result screen. Also, the display processing unit 514 updates the display of the SS position on the thumbnail of the tomographic image related to the change and the mark corresponding to the SS position related to the change instruction on the front image. Also, the display processing unit 514 updates the narrow angle-closure rate 741, narrow angle rate 742, and closed angle rate 743 displayed in the overall evaluation area 740. Note that if there is no change in the value following the change in the SS position, no update is necessary. This completes the tomographic image processing. 6 corresponds to an example of a user operation. The control unit 510 switches between the tomographic image screen and the evaluation result screen as appropriate in response to a screen switching instruction by a user operation, and also switches the display of the values ​​of each AOD 500, etc. as appropriate in response to an instruction to correct the SS position.

[0072] In this way, the ophthalmologic apparatus 1 of this embodiment displays the AOD500 value of the angle of the subject's eye and the angle level in association with the measurement position (rotation angle) at which they were obtained. This makes it possible to provide more effective information indicating the state of the angle of the subject's eye. Furthermore, the ophthalmologic apparatus displays the angle level and SS position superimposed on a front image of the anterior segment. This allows the user to visually grasp the relationship between the angle level and SS position and the actual position of the anterior segment.

[0073] The above-described embodiment is an example for carrying out the present invention, and various other embodiments are possible. At least a part of the configuration of the above-described embodiment may be omitted or replaced. As another example, at least a part of the processing may be omitted, replaced, or the order thereof may be changed.

[0074] As such a modified example, the recording medium 520 may store two AOD500 threshold tables, one for a bright room and one for a dark room. The AOD thresholds for the bright room and the dark room are different. This corresponds to the fact that the narrowness of the angle varies depending on the ambient brightness. In this case, the analysis unit 513 selects the table to be used for processing depending on the ambient brightness. In this case, the brightness or the table to be used is selected in response to a user operation. As another example, the analysis unit 513 may automatically determine the presence or absence of illumination reflected in the eye in a front image through image analysis and select the AOD500 threshold table to be used depending on the determination result. As another example, the pupil diameter at the time of measurement may be measured, and if the pupil diameter is smaller than a predetermined reference value, the AOD500 threshold table for a bright room may be selected, and if the pupil diameter is equal to or greater than the reference value, the AOD500 threshold table for a dark room may be selected.

[0075] The ophthalmologic apparatus 1 is only required to perform optical coherence tomography, and the method therefor is not limited to that described in the embodiment. Other methods include, for example, TD-OCT (Time Domain Optical Coherence Tomography) and other Fourier domain methods such as SD-OCT (Spectral Domain Optical Coherence Tomography).

[0076] The tomographic image acquisition unit 511 only needs to acquire a plurality of tomographic images with different radial directions in a radial scan centered on the corneal apex, and does not need to acquire tomographic images over 360°. In addition, in this embodiment, 18 tomographic images are acquired over 360°, but the number of tomographic images is not limited to 18. As another example, 16 tomographic images (32 gonioscopic images) may be acquired. Furthermore, the radial scan intervals between each tomographic image do not need to be equal.

[0077] The analysis unit 513 of this embodiment is only required to obtain an analytical value related to the angle of incidence, and the analytical value is not limited to the AOD 500. Other examples of analytical values ​​include the angle recess area (ARA), trabecular iris space area (TISA), and trabecular iris angle (TIA). FIG. 10 is an explanatory diagram of these analytical values. ARA is the area of ​​the range surrounded by AR, SS, T, B, and C shown in FIG. 10. Here, AR is the base of the angle of incidence, and SS is the position of the scleral promontory. T is a position on the posterior surface of the cornea a predetermined distance away from the scleral promontory. B is the position where a perpendicular line from T in the posterior surface of the cornea intersects with the anterior surface of the iris. C is the position where a perpendicular line from SS in the posterior surface of the cornea intersects with the anterior surface of the iris.

[0078] TISA is the area enclosed by SS, T, B, and C. TIA is the angle B-AR-T. As with AOD500, thresholds indicating normal ranges are set in advance for these analysis values ​​in each of the up, down, left, and right directions, and the degree of narrow angle is evaluated by comparing with these thresholds.

[0079] Furthermore, the display processing unit 514 may display the analytical values ​​on the display unit in association with the measurement positions at which the iridocorneal angles were obtained, and the display format is not limited to that described in the embodiment. As another example, the display processing unit 514 may display a list in which analytical values ​​are associated with rotation angles. Furthermore, in the present embodiment, the measurement positions are expressed as rotation angles, but the measurement positions may indicate any of the circumferential positions of the iridocorneal angles surrounding the periphery of the cornea. As another example, the measurement positions may be expressed as "upper" or "lower."

[0080] Although the display processing unit 514 of this embodiment displays the analysis level together with the AOD500 as the analysis value, the displayed information on the analysis value may be information obtained from the analysis value and is not limited to the analysis level according to this embodiment. As another example, the information on the analysis value may be two analysis levels with the AOD500 threshold as the boundary.

[0081] Furthermore, in the front image area 730 of the evaluation result screen 700, the mark does not have to be displayed at a position corresponding to the SS position. For example, the display processing unit 514 may display the mark at a position corresponding to the rotation angle at which the iridocorneal angle was obtained on a circle of a predetermined radius centered on the corneal apex of the front image. In this case, although the user does not know the SS position, the user can understand the iridocorneal angle level for each rotation angle from the color of the mark. [Explanation of symbols]

[0082] 1...ophthalmic device, 10...wavelength swept light source, 20...sample, 100...OCT interference system, 104...measurement side circulator, 105...reference side circulator, 110...balanced detector, 120...polarization controller, 200...alignment optical system, 201...collimator lens, 202...galvanometer scanner, 203...hot mirror, 204...objective lens, 205a, 205b...white light source, 206...beam splitter, 207...imaging lens, 208...area sensor, 210...fixation target light source, 211...variable focus movable lens, 212...cold mirror, 213...hot mirror, 214...relay Lens, 215...beam splitter, 216...XY position detection light source, 217...imaging lens, 218...two-dimensional position sensor, 219...Z position detection light source, 220...imaging lens, 221...line sensor, 300...reference optical system, 301...reference section, 400...interference optical system for generating k-clock, 500...control unit, 510...control section, 511...tomographic image acquisition section, 512...front image acquisition section, 513...analysis section, 514...display processing section, 515...reception section, 520...recording medium, 521...AOD500 threshold table, 530...display section, 540...operation section, 700, 800...evaluation result screen, 900...tomographic image screen

Claims

1. a tomographic image acquisition unit that acquires a plurality of tomographic images including the corneal angle obtained by radial scanning centered approximately on the corneal vertex; an analysis unit that calculates an analysis value related to the iridocorneal angle from each of the plurality of tomographic images; a display processing unit that displays, on a display unit, information about each analysis value obtained from each of the plurality of tomographic images in association with a rotation angle in the radial scan at which the iridocorneal angle corresponding to the analysis value was obtained; Equipped with the analysis unit calculates, as the analysis value, at least one of a distance, an angle, and an area between the cornea and the iris at a predetermined position based on a position of the scleral promontory set in the tomographic image; the analysis unit classifies the iridocorneal angles obtained at each rotation angle into a plurality of iridocorneal angle levels based on a preset distance threshold and the distance; a front image acquisition unit for acquiring a front image of the anterior segment of the eye; the display processing unit causes the display unit to display the front image and superimpose colored marks indicating the iridocorneal angle levels at positions in the front image corresponding to the rotation angles at which the iridocorneal angles are obtained. Tomographic image processing device.

2. The tomographic image processing apparatus according to claim 1 , wherein the distance threshold is determined based on the analysis values ​​obtained for a plurality of normal eyes.

3. 2. The tomographic image processing device according to claim 1, wherein the display processing unit displays the mark at a position in the front image corresponding to each rotation angle at which the corneal angle is obtained, and at a position corresponding to the position of the scleral promontory set in the tomographic image in a radial direction extending approximately from the corneal apex.

4. a receiving unit that receives an instruction to correct the position of the scleral promontory in the tomographic image, the analysis unit calculates the distance based on a position of the scleral promontory after the correction according to the correction instruction, and identifies the iridocorneal angle level corresponding to the calculated distance; The tomographic image processing device according to claim 3 , wherein the display processing unit displays the mark in a color indicating the angle level specified based on the corrected position of the scleral promontory at the corrected position of the scleral promontory.

5. The tomographic image processing apparatus according to claim 1 , wherein the display processing unit, when the mark is selected, displays the tomographic image in which the distance corresponding to the mark is obtained.

6. 2. The tomographic image processing apparatus according to claim 1, wherein the display processing unit displays a circular chart corresponding to the anterior segment, and displays the distance and the preset distance threshold along an axis indicating the distance set in a radial direction at a circumferential position of the chart corresponding to each rotation angle at which the distance is obtained.

7. The tomographic image processing apparatus according to claim 6 , wherein the display processing unit displays a range of the chart corresponding to the rotation angle at which the iridocorneal angle level is obtained in a color that indicates the iridocorneal angle level.

8. The tomographic image processing apparatus according to claim 1 , wherein the distance threshold is determined for each of the rotation angles.

9. At least two values ​​of the distance threshold are determined according to the brightness of the surrounding environment, The tomographic image processing apparatus according to claim 1 , wherein the analysis unit classifies the iridocorneal angles into a plurality of iridocorneal angle levels using the distance threshold set among at least two values.

10. the analysis unit calculates a comprehensive evaluation value of the degree of narrowing of the iridocorneal angle based on the analysis values ​​obtained from each of the plurality of tomographic images; The tomographic image processing apparatus according to claim 1 , wherein the display processing unit displays the comprehensive evaluation value.

11. a tomographic image acquisition unit that acquires a plurality of tomographic images including the corneal angle obtained by radial scanning centered approximately on the corneal vertex; an analysis unit that calculates an analysis value related to the iridocorneal angle from each of the plurality of tomographic images; a display processing unit that displays, on a display unit, information about each analysis value obtained from each of the plurality of tomographic images in association with a rotation angle in the radial scan at which the iridocorneal angle corresponding to the analysis value was obtained; Equipped with the analysis unit calculates, as the analysis value, at least one of a distance, an angle, and an area between the cornea and the iris at a predetermined position based on a position of the scleral promontory set in the tomographic image; the display processing unit displays a circular chart corresponding to the anterior segment, and displays the distance and a preset distance threshold value along an axis indicating the distance set in a radial direction at a circumferential position of the chart corresponding to each rotation angle at which the distance is obtained. Tomographic image processing device.

12. a tomographic image acquisition unit that acquires a plurality of tomographic images including the corneal angle obtained by radial scanning centered approximately on the corneal vertex; an analysis unit that calculates an analysis value related to the iridocorneal angle from each of the plurality of tomographic images; a display processing unit that displays, on a display unit, information about each analysis value obtained from each of the plurality of tomographic images in association with a rotation angle in the radial scan at which the iridocorneal angle corresponding to the analysis value was obtained; Equipped with the analysis unit calculates, as the analysis value, at least one of a distance, an angle, and an area between the cornea and the iris at a predetermined position based on a position of the scleral promontory set in the tomographic image; the analysis unit classifies the iridocorneal angles obtained at each rotation angle into a plurality of iridocorneal angle levels based on a preset distance threshold and the distance; the display processing unit displays the iridocorneal angle level in association with each measurement position where the iridocorneal angle is obtained; The distance threshold is determined for each rotation angle. Tomographic image processing device.

13. Computer, a tomographic image acquisition unit that acquires a plurality of tomographic images including the corneal angle obtained by radial scanning centered approximately on the corneal apex; an analysis unit that calculates an analysis value related to the iridocorneal angle from each of the plurality of tomographic images; a display processing unit that displays, on a display unit, information about each analytical value obtained from each of the plurality of tomographic images in association with a rotation angle in a radial scan at which the iridocorneal angle corresponding to the analytical value was obtained; and A front image acquisition unit for acquiring a front image of the anterior segment of the eye It is a program to function as the analysis unit calculates, as the analysis value, at least one of a distance, an angle, and an area between the cornea and the iris at a predetermined position based on a position of the scleral promontory set in the tomographic image; the analysis unit classifies the iridocorneal angles obtained at each rotation angle into a plurality of iridocorneal angle levels based on a preset distance threshold and the distance; The display processing unit displays the front image on the display unit, and displays a colored mark indicating the angle level superimposed at a position in the front image corresponding to each rotation angle at which the angle was obtained.

14. Computer, a tomographic image acquisition unit that acquires a plurality of tomographic images including the corneal angle obtained by radial scanning centered approximately on the corneal apex; an analysis unit that calculates an analysis value related to the iridocorneal angle from each of the plurality of tomographic images; and a display processing unit that displays, on a display unit, information about each analysis value obtained from each of the plurality of tomographic images in association with a rotation angle in a radial scan at which the iridocorneal angle corresponding to the analysis value was obtained. It is a program to function as the analysis unit calculates, as the analysis value, at least one of a distance, an angle, and an area between the cornea and the iris at a predetermined position based on a position of the scleral promontory set in the tomographic image; The display processing unit displays a circular chart corresponding to the anterior segment, and displays the distance and a predetermined distance threshold value along an axis indicating the distance set in a radial direction at a circumferential position of the chart corresponding to each rotation angle at which the distance is obtained.

15. Computer, a tomographic image acquisition unit that acquires a plurality of tomographic images including the corneal angle obtained by radial scanning centered approximately on the corneal apex; an analysis unit that calculates an analysis value related to the iridocorneal angle from each of the plurality of tomographic images; and a display processing unit that displays, on a display unit, information about each analysis value obtained from each of the plurality of tomographic images in association with a rotation angle in a radial scan at which the iridocorneal angle corresponding to the analysis value was obtained. It is a program to function as the analysis unit calculates, as the analysis value, at least one of a distance, an angle, and an area between the cornea and the iris at a predetermined position based on a position of the scleral promontory set in the tomographic image; the analysis unit classifies the iridocorneal angles obtained at each rotation angle into a plurality of iridocorneal angle levels based on a preset distance threshold and the distance; the display processing unit displays the iridocorneal angle level in association with each measurement position where the iridocorneal angle is obtained; The distance threshold is determined for each of the rotation angles.

Images