JP2007181537A - Perimeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a perimeter which reduces time taken for metering in the case of performing dynamic perimetry and acquires very accurate results. <P>SOLUTION: In a perimeter which projects an inspection target on the fundi of examinee's eyes and meters a visual field by the seeing response of a subject, a yellow spot or fovea centralis retinae on an eyeground image displayed by an indicating means indicating the eyeground images of the examinee's eyes and the location of the optic disk are decided and model data which are rectified by rectifying the traveling shape of the nerve fiber bundle of the model data memorized by a memory from the location relation of the yellow spot or fovea centralis retinae and the optic disk which are decided and the running state of the nerve fiber bundle of the examinee's eyes, which is input, by tracing a part of the traveling of the nerve fiber bundle, which appears in the eyeground image displayed by the indicating means, and inputting the running state are displayed with being piled up on the eyeground image. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a perimeter, and more particularly to a perimeter capable of performing dynamic perimetry.

Conventionally, perimeters that measure the visual field of an eye to be examined are known. Such a perimeter presents a test target at each measurement point on the fundus of the subject's eye, and a static perimeter that measures the visual field state of the subject's eye based on its visual response, or a test target with a constant luminance on the fundus. There is known a dynamic perimeter that moves and measures the visual field state of the eye to be examined based on the visual response (see Patent Document 1).
In addition, as a perimeter capable of performing dynamic visual field measurement of the eye to be examined, the dynamic visual field measurement along the travel of the nerve fiber bundle shortens the measurement time and performs the visual field measurement with high accuracy. A perimeter that can be used is disclosed (see Patent Document 2).
JP-A-6-54804 JP 2005-102948 A

  In such a perimeter, an apparatus that further shortens the measurement time and accurately measures the visual field is desired.

  In view of the above-described prior art, it is an object of the present invention to provide a perimeter that can reduce the time required for measurement when performing dynamic visual field measurement and obtain a highly accurate result.

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

(1) In a perimeter that projects a test target on the fundus of the subject's eye and measures the field of view based on the visual response of the subject, an imaging optical system for photographing the fundus of the subject's eye and a display that displays the fundus image of the subject's eye Storage means for storing model data in which the running of nerve fiber bundles in the fundus including the macular or fovea and the optic papilla is formed; and the macula or fovea on the fundus image displayed by the display means; , Position determining means for determining the position of the optic nerve head, and travel state input means for tracing a part of the travel of the nerve fiber bundle appearing in the fundus image displayed by the display means and inputting the travel state Stored in the storage means based on the positional relationship between the macular or fovea and the optic disc determined by the position determining means, and the running state of the nerve fiber bundle of the eye to be examined input by the input means It has correction means for correcting the running shape of the nerve fiber bundle of the model data, and display control means for displaying the model data corrected by the correction means superimposed on the fundus image.
(2) In the perimeter of (1), the correcting means considers the fundus image model data in consideration of the relative positional relationship between running curves of nerve fiber bundles possessed by the fundus image model data stored in the storage means. The shape of the running curve of the nerve fiber bundle possessed by is corrected.
(3) In the perimeter of (1), the input means includes designation means for designating positions of a plurality of arbitrary points in order to trace a part of the traveling of the nerve fiber bundle of the eye to be inspected by the examiner. And the correction means corrects the shape of at least one of the running curves of the nerve fiber bundle of the model data so as to smoothly connect a plurality of points arbitrarily designated by the designation means. It has a correction means.
(4) In the perimeter of (1) to (3), the fundus image used for inputting the traveling state of the nerve fiber bundle of the eye to be examined is scanned with laser light on the fundus of the eye to be examined. It is a fundus image taken by a scanning laser ophthalmoscope for taking a fundus image of the eye to be examined.

  According to the present invention, it is possible to reduce the time required for measurement when performing dynamic visual field measurement and obtain a highly accurate result.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of an optical system of an ophthalmologic apparatus according to this embodiment provided with a scanning laser ophthalmoscope function and a perimeter function, and FIG. 2 is a block diagram showing a control system.

  In the optical system of FIG. 1, a scanning laser off-salmoscope (SLO) optical system 300 that captures a fundus SLO image for illuminating and observing the fundus of the subject eye using infrared light, and a visual field of the subject eye are measured. Therefore, it is roughly divided into a target projection optical system 200 that projects an examination target on the fundus of the eye to be examined.

  First, the SLO optical system 300 will be described. Reference numeral 1 denotes a light source that emits laser light. In this embodiment, a semiconductor laser that emits laser light in the infrared region is used. 2 is a perforated mirror having an opening in the center, and 3 is a relay lens that can move in the optical axis direction in accordance with the refractive error of the eye to be examined. Reference numeral 4 denotes a scanning unit including a pair of galvanometer mirrors that can scan a laser beam at high speed on the fundus in the XY directions by driving the galvano driving mechanism 51. Reference numeral 5 denotes a relay lens, reference numeral 40 denotes a dichroic mirror having characteristics of reflecting infrared light and transmitting visible light, and reference numeral 10 denotes an objective lens.

  The measurement light emitted from the light source 1 passes through the opening of the perforated mirror 2, reaches the galvanometer mirror of the scanning unit 4 via the relay lens 3, and the reflection direction is changed by driving the pair of galvanometer mirrors. Then, the measurement light reflected by the galvanometer mirror is reflected by the dichroic mirror 40 via the relay lens 5 and then condensed on the eye fundus via the objective lens 10. The irradiation optical system of the SLO optical system 300 is formed by these optical members.

  Reference numeral 11 denotes a pinhole plate having a pinhole on the optical axis, which is arranged at a position conjugate with the observation point of the fundus of the eye to be examined. Reference numeral 12 denotes a condenser lens, and 13 denotes a light receiving unit. In this case, the light receiving unit 16 is disposed at a position conjugate with the observation point of the fundus oculi to be examined. Note that an APD (avalanche photodiode) is used for the light receiving unit 16 of the present embodiment.

  The reflected light of the laser beam scanned on the fundus of the eye to be examined is reflected by the perforated mirror 2 while following the irradiation optical system described above in reverse. Note that the pupil position of the eye to be examined and the opening of the perforated mirror 2 have a conjugate relationship. The reflected light reflected by the perforated mirror 2 is focused on the pinhole of the pinhole plate 11. The reflected light focused at the pinhole is received by the light receiving unit 13 through the lens 12. A photographing optical system is formed by these optical members.

  Next, the target projection optical system 200 will be described. The target projection optical system 200 includes an objective lens 10, a lens 20, a focusing lens 21, a lens 22, a lens 23, a reduction lens 24, and an LCD display 25 that presents a target for visual field measurement. The visual target presented on the LCD display 25 is projected onto the fundus of the eye E through the reduction lens 24, the lens 23, the lenses 22 to 20, the dichroic mirror 40, and the objective lens 10. A cross-shaped fixation target that is a fixation target of the subject is formed at the center (optical axis L2) of the LCD display 25. In addition, the inspection target for visual field measurement can be changed in its presentation position, brightness, and size.

  FIG. 2 is a block diagram showing a control system in the ophthalmologic apparatus of the present embodiment. Reference numeral 30 denotes a control unit for driving and controlling the entire system of the ophthalmic apparatus according to the present embodiment. The light source 1, the light receiving unit 13, the drive mechanism 51, the LCD display 25, the image processing unit 32, the monitor 31, the memory 34, and a response button. 35 and a mouse 36 are connected. The response button 35 is used when the subject can visually recognize the presented target at the time of visual field measurement. The mouse 36 is used for designating the position of the examination target on the monitor 31 and designating the moving direction of the examination target when performing dynamic visual field measurement.

  Further, the control unit 30 has a photographing button 37a, a fundus photographing mode / field-of-view measurement mode switching button 37b, and various setting button groups 37c for setting the position, brightness, size, etc. of the target presented on the LCD display 25. Also connected to the control unit 37 is a measurement button 37d that reflects the traveling of the nerve fiber bundle on the fundus display screen, a start switch 37e described later, a designation completion button 37f described later, and the like.

  The image processing unit 32 performs image processing on the image obtained by the light receiving unit 13 to construct a two-dimensional SLO fundus image. The memory 34 stores the fundus image obtained by the light receiving unit 13 and the response information of the subject obtained in the visual field measurement. The memory 34 also stores fundus image model data (hereinafter referred to as a template) that schematically illustrates the running state of the optic nerve fiber bundle in the fundus including the macula or fovea and the optic disc.

  FIG. 3 is a view showing an example of a template in which the traveling of the optic nerve fiber bundle stored in the memory 34 is formed. This template is data that schematically illustrates the running state of nerve fiber bundles around the optic disc and fovea (macular) in a normal healthy person, and is used for dynamic visual field measurement described later. Note that. Although the actual nerve fiber bundles have a very large number, the nerve fiber bundles modeled by the fundus image model data do not necessarily represent all the numbers, and are presented to the eye E to be examined in visual field measurement described later. It suffices that the number of test targets is obtained as a guideline for moving the test target along the travel of the nerve fiber bundle. The running curve data for representing the running state of such nerve fiber bundles is created using a predetermined function for representing the curve, and represents the curve shape of the running curve for each nerve fiber. Formula data is stored in the memory 34.

  The operation of the perimeter having the above configuration will be described. Since the fundus image acquired by the SLO optical system 300 is displayed on the monitor 31, the examiner observes the fundus of the eye E to be examined displayed on the monitor 31. Next, the examiner moves the lens 3 in the optical axis direction so that the fundus image is clearly shown on the monitor 31. In this case, since the fixation target is formed at the center of the LCD display 25 (on the optical axis L2), the subject can perform fixation.

  The examiner photographs the fundus of the eye E using the photographing button 37 a of the control unit 37. When the photographing button 37a is pressed, the control unit 30 stores the fundus image acquired by the SLO optical system 300 in the memory 34 as a still image. Then, the control unit 30 switches the display on the monitor 31 to a still image of the fundus image. Thereby, the examiner can inspect the fundus state of the eye E by outputting the fundus image displayed on the monitor 31 using a printer (not shown).

  Next, the examiner switches to the visual field measurement mode using the switching button 37b of the control unit 37, and dynamically measures the visual field of the subject while referring to the fundus image captured by the SLO optical system 300. . When the setting of the visual field measurement mode is performed, the control unit 30 switches the image displayed on the monitor 31 to a moving image.

  FIG. 4 is a diagram showing a state of a fundus image display screen displayed on the monitor 31 by the SLO optical system 300 at the time of visual field measurement. The examiner uses the setting button group 37c of the control unit 37 to set the size (shape) and luminance A of the inspection target for visual field measurement, and then the cursor 100 displayed on the fundus image display screen shown in FIG. Is moved using the mouse 36, and the presentation start position of the inspection target for visual field measurement to be presented on the fundus of the eye E is designated. Here, the peripheral edge of the fundus image displayed on the fundus image display screen of the monitor 31 is set as the first examination target presentation position.

  When an instruction for presenting the inspection target for a desired position of the fundus image on the monitor 31 is made by the mouse operation, the control unit 30 displays the display screen of the LCD display 25 corresponding to the presentation start position set on the fundus display screen of the monitor 31. The test target is presented at a predetermined position, and the test target is moved and displayed from the target display position toward the center of the LCD display 25 at a predetermined speed (for example, 5 ° / second). Thus, by moving and displaying the test target on the LCD display 25, the test target E is presented so that the test target moves from the peripheral part of the fundus toward the fovea (macular).

  The subject presses the response button 35 at the time when the inspection target is visible, and informs the examiner and the apparatus side that the inspection target is visible. When the response button 35 is pressed, the control unit 30 erases the examination target shown on the LCD display 25 and the target display position on the fundus image display screen when the response button 35 is pressed as shown in FIG. The target mark 101a is displayed at (viewing position). Further, an arrow 102a indicating the moving direction of the formed target mark 101a is displayed on the fundus image display screen. Further, the same measurement is performed from each direction toward the fovea at the same luminance A, and an isopter (isosensitivity line) for the luminance A is obtained. Note that the response information performed by the subject is sequentially stored in the memory 34.

  Next, an inspection target having a luminance B lower than the luminance A is moved from the inside of the isopter obtained for the luminance A toward the fovea, and the isopter for the luminance B is obtained in the same manner as described above. For the visual recognition position of the inspection target having the luminance B, the target mark 101b is displayed on the screen as shown in FIG. An arrow 102b indicating the moving direction is also displayed.

  In this way, after the isopter corresponding to each luminance level is formed, the visual field sensitivity in each part on the fundus is further dynamically measured. Generally, an isopter is formed in a substantially concentric shape centering on the fovea. However, when there is a visual field change due to glaucoma or the like, a substantially concentric isopter cannot be obtained. In addition, visual field disorders such as isolated dark spots, arcuate dark spots, and nasal staircases in glaucoma are all attributed to nerve fiber bundle damage, and the progression spreads along the nerve fiber bundle as it travels. For this reason, in the present embodiment, after forming a rough isopter in the fundus, a more detailed isopter is formed by performing dynamic visual field measurement along the travel of the nerve fiber bundle for a deformed portion that is not substantially concentric. It is supposed to be.

  Next, a part of the travel of the nerve fiber bundle appearing in the fundus image of the eye E displayed on the monitor 31 is traced, and the travel state is input to correct the travel shape of the nerve fiber bundle of the template. The steps to be performed will be described. Here, when the start switch 37e is pressed by the examiner, the control unit 30 once erases the target marks 101a and 101b and the arrows 102a and 102b displayed on the monitor 31 (see FIG. 5). Thereafter, the cursor 100 designates the position of the optic nerve head and the fovea (macular) displayed on the fundus display screen of the monitor 31. When the position of the optic nerve head and the position of the fovea are determined by the cursor 100, the control unit 30 stores the determined position information of the two points in the memory 34. Next, the control unit 30 measures the distance between the two points based on the position information of the two points designated by the cursor 100, and the distance between the two points where the distance between the optic disc and the fovea in the fundus image model data is measured first. The schematic diagram of the template stored in the memory 34 is enlarged or reduced so as to match the distance.

In the fundus image displayed on the monitor 31, the examiner can visually recognize a part of the traveling of the nerve fiber bundle of the eye E. For example, the running curve of three nerve fibers (Sa, Sb, Sc) can be confirmed. Next, the examiner inputs position information of a running curve of nerve fibers that can be visually recognized on the monitor 31. For example, the mouse 100 is used to move the cursor 100, and in order to trace the running curve Sa of the nerve fiber that can be visually recognized, tracing is performed. In this case, the control unit 30 regards the position where the mouse is clicked as a designated point, electrically displays the designated point as a mark (for example, a ₁ , a ₂ ,..., _An ) and coordinates of the designated point. The position is stored in the memory 34 as needed. When the designation of such a point reaches from the start point to the passing point to the end point of the visible nerve fiber running curve Sa, the examiner presses the designation completion button 37f. When there is an input signal from the designation completion button 37f, the control unit 30 has a template (fundus model stored in the memory 34) that has the closest relationship with the designated point sequence based on the coordinate position of the designated point sequence. (Data) The traveling curve S1 on the data is specified (see dotted lines in FIGS. 3 and 5).

  As described above, the control unit 30 corrects the curve shape data of the travel curve S1 of the template so that the travel curve S1 smoothly passes (connects) all of the plurality of points arbitrarily designated as described above. Processing is performed and stored in the memory 34. Further, since the positional relationship between the optic nerve head and the fovea is stored in the memory 34 in advance, the curve of the running curve S1 after the correction processing is used as data having position information indicating which position the curve is located with these as reference positions. Shape data is stored (see FIG. 6). Thereby, the curve shape data of the running curve S1 is changed to the data along the actual running curve Sa of the eye E to be examined. In the above case, for example, a spline function which is one of methods for expressing a curve on a computer can be used. In other words, the nerve fiber running curve data may be reconstructed using a spline function so that the identified nerve fiber running curve smoothly passes through all of a plurality of arbitrarily designated points.

  Next, the control unit 30 considers the relative positional relationship between the travel curve S1 subjected to the correction process and the travel curves of the nerve fiber bundles originally possessed by the template in the memory 34, and the travel curves of other nerve fibers possessed by the template. The process proceeds to a step of correcting the shape data. For example, the control unit 30 first obtains positional deviation information of the curve shape data of the travel curve S1 before and after the correction process (see FIG. 5). In this case, it is conceivable to obtain, for each point, how any of a plurality of points in the curve shape data of the running curve S1 before the correction process has shifted after the correction process.

  Next, the control unit 30 performs the correction process on the curve shape data (see FIG. 3) of the traveling curve S2 adjacent above based on the positional deviation information obtained before and after the correction process obtained as described above. In this case, using the fact that the traveling curves in close positional relationship have a predictable relationship to some extent, the positional deviation information when correcting the traveling curve S1 and the curve of the original traveling curve S2 of the template In consideration of the shape, correction processing is performed on the curve shape data of the running curve S2 (see FIG. 6). That is, since the curve shapes of the running curves between the nearby nerve fibers are in an approximate relationship to some extent, the running curve shape data of a certain nerve fiber by the designation of the point sequence as described above becomes the actual running curve shape of the eye E to be examined. If it is along, the correction processing is performed so that the running curve data of the nerve fibers in a position close to this are in an approximate relationship. Thereby, also in the running curve S2, curve shape data close to the actual running curve of the eye E can be created. Further, the control unit 30 similarly performs the correction process on the travel curve S11 that is adjacent to the travel curve S1 in the downward direction.

  Thereafter, the control unit 30 uses the curve shape data of the travel curve S2 subjected to the correction process as described above, and further applies the curve shape data of the travel curve S3 adjacent to the upper direction of the travel curve S2. Similarly, correction processing is performed. In this way, the same correction processing may be performed sequentially on the traveling curves adjacent in the upward direction. Further, the correction process may be performed in the same manner for a traveling curve adjacent to the lower direction of the traveling curve S11.

  As described above, the examiner also inputs position information for the running curves of other nerve fibers visible on the monitor 31 as described above, and causes the control unit 30 to perform the correction process as described above. Thus, the running curve data of the nerve fiber on the template in the vicinity of the nerve fiber to which the position information is input can be made closer to the actual one of the eye E to be examined. FIG. 6 is a diagram after correcting the running curve data of nerve fibers of the entire template in accordance with the eye E to be examined. In this way, it is possible to bring the running curve data of nerve fibers of the entire template closer to the actual running curve of the eye E.

  Next, the process proceeds to the step of performing dynamic visual field measurement along the travel of the nerve fiber bundle using the template subjected to the correction processing as described above. When the measurement button 37d of the control unit 37 is pressed by the examiner, the template after the correction process stored in the memory 34 is called. In this case, the control unit 30 matches the optic disc and the fovea in the fundus image reflected on the monitor 31 with the template enlarged or reduced as described above so as to match the optic disc and the fovea. Display it superimposed on the image. In this case, the control unit 30 displays the target marks 101a and 101b once deleted and the arrows 102a and 102b on the monitor 31.

  FIG. 7 shows a state in which the corrected fundus image model data is superimposed on the fundus image of the subject eye E displayed on the monitor 31 and displayed. As shown in the figure, since the schematic diagram is displayed superimposed on the fundus image, the examiner can easily confirm the traveling of the nerve fiber bundle in the fundus of the eye E just by looking at the monitor 31.

  In the present embodiment, the isopter on the fundus image formed on the fundus image display screen of the monitor 31 is deformed in the lower right portion of the isopter in the target mark 101b as shown in FIG. FIG. 8 is a schematic view in which a deformed portion of the isopter in FIG. 7 is partially enlarged.

The examiner uses the cursor 100 to designate the start point P for starting the movement of the inspection target. In the present embodiment, using an inspection target having a luminance A that can be visually recognized outside the target mark 101b, a position where the isopter is deformed in the target mark 101b shown in FIG. For example, a position slightly outside the optotype mark 101b ₁ ) is set as the movement start start point P.

  When the start point P is designated, the control unit 30 presents the test target on the LCD display 25 along the travel of the nerve fiber bundle G passing through the start point P in the isopter direction (the arrow Y1 direction in the figure) of the target mark 101a. And move at a predetermined speed.

  The subject presses the response button 35 and makes a visual response of the test target moving along the travel of the nerve fiber bundle G. When the response button 35 is pressed, the control unit 30 displays the target mark 101 a on the fundus image display screen of the monitor 31. Next, the examiner designates an arbitrary position on the nerve fiber bundle G to which the examination target has moved using the cursor 100. The control unit 30 moves the inspection target in a direction perpendicular to the nerve fiber bundle G (in the direction of arrow Y2 in the drawing) from an arbitrary position on the nerve fiber bundle designated by the cursor 100. As described above, the subject uses the response button 35 to respond to the visual recognition of the inspection target, and the control unit 30 displays the target mark 101a based on the response signal.

  When all the measurements are completed, the examiner presses an end button (not shown) of the control button 37. When the end button is pressed, the control unit 30 deletes the fundus image model data from the monitor 31 and displays an isopter representing more detailed visual field sensitivity as shown in FIG.

  Thus, when performing dynamic visual field measurement along the travel of the nerve fiber bundle, the visual field position is determined using the fundus image model data corresponding to the travel of the specific nerve fiber bundle of the measured eye. Since it can be specified, the measurement time can be shortened and the visual field measurement can be performed with high accuracy.

  In this embodiment, since the SLO optical system is used as the imaging optical system for photographing the fundus of the eye to be examined, the resolution and contrast of the acquired fundus image are excellent, and thus the running state of the nerve fiber bundle of the eye to be examined It is easy to grasp. Therefore, a template closer to the traveling of the nerve fiber bundle of the eye to be examined can be created by the correction process as described above. In addition, a fundus camera may be used for photographing the fundus of the eye to be examined.

  A plurality of templates may be prepared in accordance with the gender and age of the eye to be examined, and the template used for measurement may be selected. In this case, when inputting the traveling state of the nerve fiber bundle of the eye to be examined, a template to be corrected may be selected by inputting eye information such as sex and age of the eye to be examined. . This makes it possible to create a template that is closer to the running of the nerve fiber bundle of the eye to be examined.

  In the above description, the target projection optical system 200 having the LCD display 25 is configured to project the target on the eye to be examined. However, the target projection optical system 200 has a function of projecting the target on the SLO optical system 300. You may make it let. In this case, for example, using a dichroic mirror, the visible light source visible to the eye to be examined is coaxial with the infrared light beam emitted from the infrared laser light source 1 and the visible light beam emitted from the visible light source. Arrange as follows. Then, the visible light source is turned on by the control unit 30 in synchronization with the timing at which the scanning unit 4 scans the fundus two-dimensionally on a predetermined target-presenting region on the fundus of the eye to be examined. Good.

  The perimeter of this embodiment is an optical system provided with the functions of a scanning laser ophthalmoscope and the perimeter, but was photographed by a scanning laser ophthalmoscope installed separately from the perimeter. Fundus image data may be used. In this case, the fundus image data photographed by another device is stored in the memory 34 of the perimeter, and the nerve fiber bundle of the eye to be examined which can be visually recognized by the examiner from the fundus image when the image data is displayed on the monitor 31. It is conceivable that the traveling state of the nerve fiber bundle is corrected on the basis of this traveling state and the fundus image model data is corrected based on the traveling state.

It is a block diagram of the optical system of the ophthalmologic apparatus of this embodiment provided with the function of the scanning laser ophthalmoscope and the function of a perimeter. It is a block diagram which shows the control system of the ophthalmologic apparatus of this embodiment. It is the figure which showed an example of the template in which the run of the optic nerve fiber bundle memorize | stored in memory was formed. It is the figure which showed the mode of the fundus image display screen displayed on a monitor by the SLO optical system at the time of visual field measurement. It is a figure explaining the input of the running state of the running curve of the nerve fiber which can be visually recognized on a monitor. It is the figure after carrying out the correction process according to the eye to be examined for the running curve data of the nerve fiber of the whole template. A state in which a schematic diagram of the fundus image model data after correction processing is superimposed on the fundus image of the eye to be examined displayed on the monitor is displayed. It is the schematic diagram which expanded and displayed the deformation | transformation location of the isopter in FIG. An isopter representing a more detailed visual field sensitivity is displayed.

Explanation of symbols

31 Monitor 32 Image Processing Unit 34 Memory 35 Response Button 36 Mouse 100 Cursor 101 Target Mark 102 Arrow 200 Target Projection Optical System 300 SLO Optical System

Claims (4)

In a perimeter that projects an inspection target on the fundus of the subject's eye and measures the field of view based on the visual response of the subject, an imaging optical system for photographing the fundus of the subject's eye, and display means for displaying the eye fundus image of the subject's eye, Storage means for storing model data in which the running of nerve fiber bundles in the fundus including the macula or fovea and the optic disc is formed, the macula or fovea on the fundus image displayed by the display means, and the optic disc A position determining means for determining the position of the body, a travel state input means for tracing a part of the travel of the nerve fiber bundle appearing in the fundus image displayed by the display means, and inputting the travel state, and the position The model stored in the storage unit based on the positional relationship between the macular or fovea and the optic disc determined by the determination unit and the running state of the nerve fiber bundle of the eye to be examined input by the input unit Perimeter, characterized in that it comprises a correcting means for correcting the traveling shape of nerve fiber bundle over data, and a display control means for displaying superimposed on the fundus image model data corrected by said correction means. 2. The perimeter of claim 1, wherein the correcting means takes into account the relative positional relationship between running curves of nerve fiber bundles possessed by the fundus image model data stored in the storage means, and the nerves possessed by the fundus image model data. A perimeter that corrects the shape of the running curve of the fiber bundle. The perimeter according to claim 1, wherein the input means includes designation means for designating positions of arbitrary plural points in order to trace a part of the traveling of the nerve fiber bundle of the eye to be inspected by the examiner. The correction means includes a correction means for correcting the shape of at least one running curve of the running curves of nerve fiber bundles possessed by the model data so as to smoothly connect a plurality of points arbitrarily designated by the designation means. A perimeter, comprising: 4. The perimetry according to claim 1, wherein the fundus image used for inputting the traveling state of the nerve fiber bundle of the eye to be examined by the input means is scanned by laser light on the fundus of the eye to be examined. A perimeter that is a fundus image taken by a scanning laser ophthalmoscope for taking a picture.

Images