JP5484139B2 - Ophthalmic equipment - Google Patents

Description

  The present invention relates to an ophthalmologic apparatus for confirming the wearing state of an intraocular lens in an eye to be examined after surgery.

  In recent years, a toric intraocular lens corresponding to astigmatism correction has appeared as one of intraocular lenses. When prescribing such a toric intraocular lens, the corneal curvature and the corneal astigmatic axis are calculated by a keratometer (for example, Patent Document 1), the axial length is calculated by an axial length measuring device, and inserted based on these. A toric intraocular lens is determined.

  Then, the surgeon performs the first marking in the horizontal axis direction of the eye to be examined using a dedicated member, and further corresponds to the astigmatic axis (strong principal meridian direction) of the eye to be examined with the first marking as a reference. A second marking is applied to the position, and the intraocular lens is inserted into the eye so that the second marking and the astigmatic axis of the toric intraocular lens are aligned.

JP 2003-169778 A

  However, if the astigmatism axis of the eye to be examined and the astigmatism axis of the toric intraocular lens are shifted from each other in the eye, sufficient correction results may not be obtained. There are many factors that cause axis misalignment. For example, when the subject's posture changes between when the corneal shape is measured and when marking is performed, when the astigmatic axis cannot be marked, or when the examiner's camera shake occurs when an intraocular lens is inserted, etc. Is mentioned. In addition, a shift may occur until the intraocular lens is stabilized in the eye after surgery. In addition, none of the conventional devices can confirm the axial displacement of the toric intraocular lens after the operation.

In view of the above problems, it is an object of the present invention according to Claim 1 to provide an ophthalmologic apparatus capable of easily confirming the wearing state of a toric intraocular lens of an eye to be examined .

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) A projection optical system having a projection light source and projecting measurement light onto a subject's eye cornea, an illumination optical system projecting illumination light for photographing an intra-pupil image of the subject's eye, an image pickup element having a front of the eyes eye and the imaging surface disposed on a position substantially conjugate with an imaging optical system for imaging the pupil within the image of the eye by the cornea reflection image by the measurement light and the illumination optical system, wherein A corneal astigmatism axis detecting means for detecting a corneal astigmatism axis direction based on the corneal reflection image picked up by the image sensor, and the intra-pupil image stored in the storage means using a detection result by the corneal astigmatism axis detecting means. A toric intraocular eye in the eye to be examined , comprising: an image processing unit that superimposes a corneal astigmatic axis index indicating a corneal astigmatic axis direction; and a control unit that outputs an intra-pupil image superimposed by the image processing unit The wearing state of the lens It can be confirmed.
(2) The ophthalmologic apparatus according to (1), further comprising astigmatism axis information detection means for detecting lens astigmatism axis information of a toric intraocular lens based on an intra-pupil image stored in the storage means, and the image processing means A lens astigmatic axis index indicating the astigmatic axis of the toric intraocular lens is displayed together with the corneal astigmatic axis index based on the detected lens astigmatic axis information.
(3) using the astigmatic axis direction data of the eye, the image processing means and, superimposed by the image processing means processed the pupil for processing overlay corneal astigmatic axis index of the corneal astigmatic axis direction to the pupil in the image And a control means for outputting an image.

According to the first aspect of the present invention, it is possible to easily confirm the wearing state of the toric intraocular lens in the eye to be examined .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an optical system and a control system of an ophthalmologic apparatus.

  The optical system of the present apparatus includes a light projecting optical system (40) having a light projecting light source (41) and projecting measurement light to the eye cornea, and a post-operative eye of the eye to be examined in which a toric intraocular lens is inserted. Measuring light having an illumination optical system (10a) for projecting illumination light for photographing an image in the pupil, and an imaging element (35) having an imaging surface arranged at a position substantially conjugate with the anterior eye portion of the eye to be examined And an imaging optical system (30) that captures an image in the pupil of the eye to be examined by the corneal reflection image and the illumination optical system (10a). In addition, the number in () is only a reference number, and a specific structure is not limited to this.

  For the projection optical system (40), for example, a projection optical system 40 that projects a measurement index for measuring the corneal shape is used (for example, a projection system of a keratometer). The projection optical system 40 projects a ring index, for example. Further, it is sufficient that at least three or more point light sources are arranged on the same circumference centered on the optical axis L1, and an intermittent ring light source may be used. Further, it may be a placido index projection optical system that projects a plurality of ring indexes.

  As the illumination optical system (10a), an illumination optical system that illuminates the fundus of the subject's eye to shoot a transillumination image of the subject's eye, an illumination optical system that illuminates the anterior eye portion of the subject's eye from the front, and the like are used.

  In addition, the configuration for taking a transillumination image makes it easy to grasp the position of the astigmatic axis mark of the toric intraocular lens. In this case, for example, the light projection optical system 10a of the axial length measurement optical system 10 is used, and the projection of the axial length measurement light is also used. In the following description, the optical interference optical system is used for shooting images, but a dedicated projection optical system may of course be used.

  Note that the present invention is not limited to the application to the optical interference type axial length measuring device, and the present invention can also be applied to an auto-refractometer. In this case, it is also possible to use a measurement light source of an auto reflex (eye refractive power measurement optical system) for taking a shot image. Of course, application to a simple keratometer is also possible.

  For the imaging optical system (30), for example, the imaging optical system 30 that captures an anterior ocular segment front image is used. The imaging optical system may be provided with two imaging elements, and may be divided into a corneal shape measurement and an intra-pupil image photographing.

  Further, the optical system for measuring the corneal shape is not limited to the configuration of the keratometer. For example, a light projecting optical system and an imaging optical system for capturing a cross-sectional image of the anterior segment by applying the principle of OCT or Scheinproof are provided.

  A specific configuration of the above-described optical system will be described below. This optical system is roughly classified into an axial length measurement optical system (hereinafter referred to as measurement optical system) 10, a projection optical system 40, an alignment projection optical system 50, and an anterior ocular segment front imaging optical system (hereinafter referred to as imaging optical system) 30. The The light projecting system and the imaging optical system 30 of the measurement optical system 10 also serve as an optical system that captures a transillumination image by projecting illumination light onto the fundus and receiving the reflected light on the image sensor 35. Yes.

  The following optical system is built in a housing (not shown). Further, the casing is three-dimensionally moved with respect to the subject's eye via an operation member (for example, a joystick) by driving a known alignment moving mechanism.

  The projection optical system 40 includes a ring-shaped light source 41 disposed around the measurement optical axis L1, and is used for projecting a ring index to measure a corneal shape (curvature, astigmatic axis angle, etc.). As the light source 41, for example, an LED that emits infrared light or visible light is used.

  The alignment projection optical system 50 is disposed inside the light source 41, has a projection light source 51 that emits infrared light, and is used to project an alignment index onto the subject's eye cornea. And the alignment parameter | index projected on the cornea is used for position alignment (for example, automatic alignment, alignment detection, manual alignment, etc.) with respect to a subject's eye. In the present embodiment, the projection optical system 50 is an optical system that projects a ring index onto the subject's cornea, and the ring index also serves as a Mayer ring. Further, the light source 51 of the projection optical system 50 also serves as anterior segment illumination for illuminating the anterior segment with infrared light from an oblique direction.

  The imaging optical system 30 includes a dichroic mirror 33, an objective lens 47, a mirror 62, a filter 34, an imaging lens 37, and a two-dimensional imaging element 35, and is used to capture an anterior ocular segment front image. The two-dimensional image sensor 35 is disposed at a position substantially conjugate with the anterior eye portion.

  The anterior ocular segment light reflected by the projection optical system 40 and the projection optical system 50 is imaged on the two-dimensional image sensor 35 through the dichroic mirror 33, the objective lens 47, the mirror 62, the filter 34, and the imaging lens 37. .

  The axial length measurement optical system 10 includes a light projecting optical system 10a and a light receiving optical system 10b, and projects measurement light onto the eye to be examined and detects interference light due to the reflected light. The light projecting optical system 10a is a measurement light source 1 that emits low-coherent light (also serves as a fixation lamp in the present embodiment), a collimator lens 3 that uses a light beam emitted from the measurement light source 1 as a parallel light beam, and a light beam emitted from the light source 1. A beam splitter (hereinafter referred to as a beam splitter) 5 that splits the emitted light, a first triangular prism (corner cube) 7 disposed in the transmission direction of the beam splitter 5, and a second triangular prism disposed in the reflection direction of the beam splitter 5. 9, a polarizing beam splitter 11, and a ¼ wavelength plate 18. In the present embodiment, the measurement light source 1 also serves as a fixation lamp, but a fixation lamp may be provided separately.

  The light (linearly polarized light) emitted from the light source 1 is collimated by the collimator lens 3 and then split by the beam splitter 5 into first measurement light and second measurement light. Then, the divided light is reflected by the triangular prism 7 (first measurement light) and the triangular prism 9 (second measurement light) and folded, and then combined by the beam splitter 5. The synthesized light is reflected by the polarization beam splitter 11, converted into circularly polarized light by the quarter-wave plate 18, and then irradiated to at least the eye cornea and the fundus via the dichroic mirror 33. At this time, when the measurement light beam is reflected by the cornea and the fundus of the subject's eye, the phase is converted by ½ wavelength.

  The light receiving optical system 10b arranged to receive the corneal reflection light by the measurement light and the interference light by the fundus reflection light includes the dichroic mirror 33, the quarter wavelength plate 18, the polarization beam splitter 11, and the condenser lens 19. And a light receiving element 21.

  The corneal reflection light and fundus reflection light are transmitted through the dichroic mirror 33 and converted into linearly polarized light by the quarter wavelength plate 18. Thereafter, the reflected light transmitted through the polarization beam splitter 11 is collected by the condenser lens 19 and then received by the light receiving element 21.

  The triangular prism 7 is used as an optical path length changing member for changing the optical path length, and is linearly moved in the optical axis direction with respect to the beam splitter 5 by driving of a driving unit 71 (for example, a motor). In this case, the optical path length changing member may be a triangular mirror. The driving position of the prism 7 is detected by a position detection sensor 72 (for example, a potentiometer, an encoder, etc.).

  In the above description, the corneal reflection light and the fundus reflection light are configured to interfere with each other. However, the present invention is not limited to this. That is, it has a beam splitter (light splitting member) that splits the light emitted from the light source, a sample arm, a reference arm, and a light receiving element for receiving interference light, and the eye to be examined via the sample arm. It may be an eye size measuring device provided with a light interference optical system that receives interference light due to the measurement light irradiated to the reference light from the reference arm by a light receiving element. In this case, the optical path length changing member is disposed on at least one of the sample arm and the reference arm.

  In the above configuration, the optical path length of the reference light is changed by moving the prism 7 linearly. However, the present invention is not limited to this, and the optical path length of the reference light is controlled by an optical delay mechanism using a rotating reflector. Even if it is the structure which changes this, application of this invention is possible (for example, refer Unexamined-Japanese-Patent No. 2005-160694).

  Further, the measurement light source 1 of the axial length measurement optical system 10 is used as a transillumination light source, and the light is projected onto the fundus of the eye to be examined through the same optical path as the light projection optical system 10a. Then, the inside of the pupil of the eye to be examined is illuminated from behind by the fundus reflection light. The light emitted from the eye pupil to be examined is imaged by the two-dimensional image sensor 35 through the same path as the above-described anterior segment reflection light. Thereby, a transillumination image in the eye pupil to be examined is acquired.

  Next, the control system will be described. The control unit 80 controls the entire apparatus and calculates measurement results. The control unit 80 is connected to the light source 1, the light source 51, the light source 41, the light receiving element 21, the imaging element 35, the monitor 70, the memory 85, and the like.

  An outline of the operation of this apparatus will be described. The memory 85 stores a cornea reflection image (see FIG. 2) and an intra-pupil image (see G in FIG. 3) based on the image signal output from the image sensor 35. Then, the control unit 80 detects the corneal astigmatic axis direction based on the corneal reflection image stored in the memory 85 (see FIG. 2).

  The control unit 80 uses the detection result in the astigmatism axis direction described above, and the corneal astigmatism axis index (line B1 in FIG. 5) indicating the corneal astigmatism axis direction in the intra-pupil image (see G in FIG. 3) stored in the memory 85. Process). Then, the control unit 80 outputs the image in the pupil that has been subjected to the overlay process (see FIG. 5).

  In this case, lens astigmatism axis information of the toric intraocular lens may be detected based on the intra-pupil image stored in the memory 85. In this case, lens astigmatism axis information is detected automatically or manually. When obtaining astigmatic axis information, for example, an astigmatic axis mark 91 formed on the intraocular lens is detected (see FIGS. 3 and 4).

  Then, the control unit 80 converts a lens astigmatism axis index (see line M1 in FIG. 5) indicating the astigmatism axis of the toric intraocular lens based on the detected lens astigmatism axis information into a corneal astigmatism axis target (line M1 in FIG. 5). Display). In this case, for example, the image is displayed in a state of being superimposed on the intra-pupil image including the astigmatic axis mark. Further, it may be displayed in a state of being superimposed on the anterior segment image. It may also be displayed at the end of the monitor.

  When the astigmatic axis mark 91 is automatically detected, the control unit 80 detects, for example, a luminance change portion corresponding to the astigmatic axis mark 91 based on the intra-pupil image stored in the memory 85 by image processing ( (See FIGS. 3 and 4). Further, the control unit 80 superimposes the lens astigmatism axis index (see the line M1 in FIG. 5) on the intra-pupil image based on the detected luminance change portion.

  Further, the control unit 80 detects an axial shift in the lens astigmatism axis direction with respect to the corneal astigmatism axis direction, and displays the detection result together with the intra-pupil image (see Δθ in FIG. 5). In this case, the control unit 80 may detect the axis deviation by obtaining the angles of the lens astigmatism axis and the corneal astigmatism axis, respectively. The control unit 80 may detect the astigmatic axis mark angle with respect to the corneal astigmatic axis direction by image processing with a certain center point as a reference.

  The control unit 80 detects the corneal center position based on the corneal reflection image stored in the memory 85 (see FIG. 2). Further, the control unit 80 detects the optical center position of the intraocular lens based on the intra-pupil image stored in the memory 85, and detects the deviation amount of the optical center position with respect to the corneal center position (see FIG. 3). And the control part 80 displays the detection result with the image in a pupil.

  Next, a specific example of the operation of this apparatus will be described. This device measures the corneal shape of the subject's eye before surgery, confirms the preoperative mode for determining the power of the intraocular lens, and the toric intraocular lens insertion position in the eye after surgery, There is a postoperative mode that can confirm the deviation of the astigmatism axis. In this embodiment, in the postoperative mode, a toric intraocular lens insertion eye is photographed and its axial deviation is measured. The operation in the postoperative mode will be described below.

<Kerato photography>
When the examiner selects a switch for switching to a postoperative mode (not shown), the control unit 80 switches the mode from the preoperative mode to the postoperative mode. The postoperative mode is preferably performed in a mydriatic state with a mydriatic agent.

  First, corneal shape measurement is performed. FIG. 2 is a diagram illustrating an anterior ocular segment observation screen on which an anterior ocular segment image captured by the image sensor 35 is displayed. At the time of alignment, the light source 51 and the light source 41 are turned on. Here, as shown in FIG. 2, the examiner performs vertical and horizontal alignment so that the electronically displayed reticle LT and the ring index R <b> 1 by the light source 51 are concentric. In addition, the examiner performs front-rear alignment so that the ring index R1 is in focus. A ring index R2 from the light source 41 is displayed outside the ring index R1.

  When alignment is performed as described above and a predetermined trigger signal is generated, the control unit 80 captures an anterior segment image. Then, the control unit 80 acquires an anterior ocular segment image including the ring indexes R1 and R2 as a still image based on the imaging signal output from the imaging element 35, and stores it in the memory 85 (see FIG. 2).

  Then, the control unit 80 determines the corneal shape of the eye to be examined (for example, the corneal curvature in the strong main meridian direction and the weak main meridian direction, the astigmatic axis of the cornea based on the ring index image R2 in the anterior segment image stored in the memory 85. Angle, etc.) is calculated, and the measurement result is stored in the memory 85. In the case of a corneal astigmatic eye, the index image R2 has an elliptical shape, and thus the control unit 80 obtains an astigmatic axis angle by detecting the major axis direction and the minor axis direction. Further, the control unit 80 detects the position coordinates of the corneal center of the eye to be examined based on the ring index R1 or the ring index R2, and stores the detection result in the memory 85.

<Tetsuri shooting>
When the anterior ocular segment imaging including the ring index is finished, the control unit 80 turns off the light source 51 and the light source 41, turns on the light source 1, and captures a transillumination image with the imaging element 35 by the fundus reflection light of the light source 1, It is stored in the memory 85 (see FIG. 3).

  In this case, the iris portion of the eye to be examined is captured by the image sensor 35 as a dark image in order to reduce fundus reflection light (see the pupil region 92 in FIG. 3). The pupil region 92 indicates the boundary position between the iris and the pupil.

  In the present embodiment, the marking portion indicating the astigmatic axis of the TOLIC-IOL (hereinafter referred to as IOL) is imaged on the image sensor 35 as a dark image in the present embodiment in order to reduce fundus reflection light. (See astigmatic axis mark 91 in FIG. 3). In addition, other regions in the pupil are captured by the image sensor 35 as bright images by fundus reflection light.

<Composition processing of corneal shape measurement result and transillumination image>
Next, the control unit 80 creates a composite image for confirming the displacement of the astigmatic axis of the IOL based on the astigmatic axis angle data of the eye to be examined and the transillumination image stored in the memory 85.

  FIG. 3 shows a photographed transillumination image. First, the control unit 80 detects the edge of the pupil region 92 from the light amount distribution of the transillumination image, and obtains a pupil shape. Further, the control unit 80 calculates the pupil center O based on the edge detection result of the pupil region 92.

  Next, the control unit 80 sequentially detects edges in each meridian direction around the pupil center O in the pupil region 92 one by one.

  In this case, in the position where the astigmatic axis mark 91 is written on the IOL, the corresponding luminance change occurs (see FIG. 4), whereas in the position where the astigmatic axis mark 91 is not written, the brightness changes. There is almost no change. Note that the astigmatism axis mark 91 is shown at a symmetrical position with respect to the optical center of the IOL.

  Specifically, for the position where the two astigmatism axis marks 91 are written, as shown in FIG. 4, two luminance change portions 96b and 97b are detected. Using this, the control unit 80 can detect the notation position of the astigmatic axis mark 91 by analyzing the edge detection result in each meridian direction and detecting the luminance change portions 96b and 97b by the astigmatic axis mark 91.

  FIG. 5 is a specific example of an image obtained by combining a corneal shape measurement result and a transillumination image. The following composition processing is performed by image processing. When the notation position of the two astigmatism axis marks 91 is detected, the control unit 80 obtains the position coordinates of a straight line connecting the notation positions of the two astigmatism axis marks 91 and synthesizes them as a line M1 with the transillumination image. The line M1 serves as an index for indicating the astigmatic axis of the IOL.

  In addition, the control unit 80 synthesizes a straight line image corresponding to the astigmatic axis angle calculated as described above as a line B1 to the transillumination image. Line B1 serves as an index for indicating the astigmatic axis direction of the eye cornea to be examined.

  The control unit 80 detects the center position between the two astigmatism axis marks 91 and displays the line B1 on the transillumination image on the monitor 70 so that the line B1 passes through the position corresponding to the center position. Let In this case, it is easier to grasp the angular relationship if the center of the line B1 coincides with the center position between the two astigmatic axis marks 91.

  Further, the control unit 80 detects the amount of deviation between the cornea center position detected as described above and the center position between the two astigmatism axis marks 91, and the detection result is displayed on the monitor 70 together with the transillumination image. indicate. For example, as shown in FIG. 5, the transilluminated image is synthesized as a deviation amount (ΔX, ΔY) in the XY direction.

Further, the control unit 80 calculates an angle difference Δθ between the astigmatic axis angle of the IOL and the astigmatic axis angle of the cornea based on the angle of the astigmatic axis (line M1) of the IOL and the astigmatic axis of the eye cornea (line B1). The calculation result is displayed together with the transillumination image. The angle difference Δθ synthesized with the transillumination image represents the amount of axial deviation between the corneal astigmatic axis and the IOL astigmatic axis.
For example, the control unit 80 can calculate the angle of the astigmatic axis of the IOL based on the meridian direction in which the astigmatic axis mark 91 is detected.

Further, the control unit 80 calculates the residual astigmatism amount as a refractive power that has not been corrected (difference between the corrected corrected refractive power that is actually corrected and the refractive power that is actually corrected) based on the angle difference Δθ. Then, it is synthesized with respect to the illuminated image (see FIG. 5). The residual astigmatism amount is calculated by combining the refractive power of the cornea (S ₁ (spherical power), C ₁ (column surface power), A ₁ (astigmatic axis angle)) and IOL (S ₂ , C ₂ , A ₂ ). Based on (S ₁₂ , C ₁₂ , A ₁₂ ), C ₁₂ = − (C ₁ ² + C ₂ ² + 2C ₁ C ₂ cos (2dθ)) ^1/2 . Note that dθ is an angle by which the astigmatic axis of the IOL is rotated around the optical axis from a position where the astigmatic axis angle of the cornea coincides with the astigmatic axis angle of the cornea.

  Then, the output data based on the transillumination image data as shown in FIG. 5 is inserted into the eye in a state where the astigmatic axis of the eye to be examined and the astigmatic axis of the IOL are shifted, and a sufficient correction result cannot be obtained. In some cases, it is used when confirming the misalignment between the astigmatic axis of the toric intraocular lens after surgery and the astigmatic axis of the eye to be examined.

  Therefore, it can be confirmed whether the toric intraocular lens is placed at an appropriate position in the eye after the operation, and the cause when the patient cannot obtain a sufficient correction result after the operation can be grasped.

  The transilluminated image data created by the image processing as described above is stored in the memory 85. The control unit 80 can display and output the illuminated image data on the monitor 70, and can also perform printing output and data output by a printer.

  In the above embodiment, the position of the astigmatic axis mark 91 is detected from the transillumination image, but the present invention is not limited to this. For example, it can be detected from the front image of the anterior segment.

  In the above description, the axis deviation is output as Δθ. However, the present invention is not limited to this, and angle information for determining the axis deviation may be displayed together with the transillumination image. For example, an angle scale (for example, a protractor) for confirming the angle between the line M1 and the line B1 may be combined and displayed on the transillumination image. In this case, it is preferable to give a scale by setting the position of the line B1 to 0 degree.

  In this embodiment, the line B1 is displayed on the transillumination image so that the line B1 passes through the position corresponding to the detected center position. However, the present invention is not limited to this. For example, the line B1 and the end of the line M1 may overlap. That is, there is no predetermined position where the line B1 and the line M1 should be overlapped, and it is only necessary to confirm the axis deviation between the lines.

  In the present embodiment, the axis deviation information is displayed on the transillumination image, but the present invention is not limited to this. For example, it may be on the anterior ocular segment display screen. In this case, the astigmatic axis (line M1) of the IOL on the transillumination image may be synthesized on the anterior ocular segment display screen.

  In this embodiment, when the astigmatic axis mark is formed on the support portion of the IOL, the position of the astigmatic axis mark on the support portion is detected. The astigmatic axis mark includes a mark that functions as a mark indicating the astigmatic axis of the lens.

  The axis deviation amount may be calculated manually. The control unit 80 can rotate the line B1 corresponding to the corneal astigmatic axis based on an operation signal from a predetermined switch manually operated by the examiner, and the astigmatic axis mark 91 and the line B2 are in a parallel relationship. You may make it measure the rotation angle of the line B1.

  In the present embodiment, as a method of detecting the position of the astigmatic axis mark 91, a method of detecting edges in each meridian direction in order of once in a 360 degree direction is used, but is not limited thereto. For example, the entire display screen may be scanned sequentially in the X or Y direction to detect a luminance change portion corresponding to the astigmatic axis mark 91.

  Further, the positions of the two astigmatic axis marks 91 on the monitor 70 are specified based on an operation signal from a predetermined switch manually operated by the examiner, and the line B1 is displayed based on the position information. May be. In this case, position specification with a computer mouse is effective.

<Axial length measurement>
In the preoperative mode, the axial length is measured in addition to kerato imaging and transillumination imaging. The operation for measuring the axial length will be described below. The control unit 80 turns on the measurement light source 1 in the same manner as the transillumination photographing. Then, the measurement light is irradiated to the eye to be examined by the axial length measurement optical system 10, and the reflected light from the eye to be examined by the measurement light is incident on the light receiving element 21 of the light receiving optical system 10b.

  Further, the control unit 80 controls driving of the driving unit 71 to reciprocate the first triangular prism 7. Then, the control unit 80 calculates the axial length based on the timing when the interference light is detected by the light receiving element 21. For example, the control unit 80 acquires an interference signal output from the light receiving element 21 when the prism 7 is moved, detects the position of the prism 7 when the interference signal is acquired by the position sensor 72, and performs predetermined processing. The axial length value is obtained using the above formula, table, and the like.

It is a schematic block diagram shown about the optical system and control system of an ophthalmologic apparatus. It is a figure which shows the anterior ocular segment observation screen on which the imaged anterior segment image was displayed. It is a figure which shows the screen on which the imaged intrapupillary image was displayed. It is the figure which detected the brightness | luminance change part corresponding to an astigmatic axis mark based on the image in a pupil by image processing. It is a figure which shows the screen which superimposed and displayed the detection result with respect to the transillumination image.

10a Projection optical system 30 Imaging optical system 35 Two-dimensional imaging device 40 Projection optical system 41 Light source

Claims (3)

A light projecting optical system having a light projecting light source and projecting measurement light to the eye cornea;
An illumination optical system for projecting illumination light for photographing an intra-pupil image of the eye to be examined;
An imaging optical system having an imaging element having an imaging surface arranged at a position substantially conjugate with the anterior eye portion of the eye to be examined, and imaging a corneal reflection image by the measurement light and an intra-pupil image of the eye to be examined by the illumination optical system; ,
Corneal astigmatism axis detecting means for detecting a corneal astigmatism axis direction based on the corneal reflection image imaged by the imaging element ;
Image processing means for superimposing a corneal astigmatism axis index indicating a corneal astigmatism axis direction on the intra-pupil image stored in the storage means , using a detection result by the corneal astigmatism axis detection means;
Control means for outputting an image in the pupil superimposed by the image processing means ;
An ophthalmologic apparatus comprising: a toric intraocular lens mounted on an eye to be examined . The ophthalmic device according to claim 1.
Astigmatism axis information detection means for detecting lens astigmatism axis information of the toric intraocular lens based on the intra-pupil image stored in the storage means,
The ophthalmologic apparatus, wherein the image processing means displays a lens astigmatism axis index indicating an astigmatism axis of a toric intraocular lens based on the detected lens astigmatism axis information together with the corneal astigmatism axis index. Image processing means for superimposing a corneal astigmatism axis index indicating the corneal astigmatism axis direction on the intra-pupil image using astigmatism axis direction data of the eye to be examined ;
Control means for outputting an image in the pupil superimposed by the image processing means ;
An ophthalmologic apparatus comprising:

Images