JPH0810221A - Eyeground perimeter - Google Patents

Abstract

PURPOSE:To share one device with both functions of a general center perimeter and an eyeground perimeter. CONSTITUTION:An eyeground image Er, is displayed on a television camera 25 by emitting light from a stroboscopic light source 9, projecting light on an eyeground Er and image-picking up reflected light by the television camera 25 in the photographing of the eyeground. An inspector observes the eyeground image Er', and outputs a mark M to a measuring part by a mouse 26. In the measurement of a visual field, the eyeground image Er' by near infrared rays is displayed on the television monitor 25, and the direction of the line of sight and the generating position of stimulus light for measuring the visual field on a liquid crystal display panel 20 are decided. The stimulus light can be accurately projected on the measuring part designated on the still picture of the eyeground image Er' by the light by generating the stimulus light at that position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus perimeter used for visual field measurement in an ophthalmic hospital or the like.

[0002]

2. Description of the Related Art Conventionally, in a fundus perimeter, the field of view is measured while observing the fundus of the eye, so that it is necessary to always maintain alignment during the measurement. On the other hand, the eyeball of the subject is difficult to stabilize, and the eyeball must be realigned each time the eyeball moves. Further, in a normal perimeter, the anterior segment is displayed on a small screen for monitoring, but no alignment operation is particularly required during the visual field measurement.

[0003]

However, in the conventional fundus perimeter, the visual target is provided at the fundus conjugate position directly or through the relay optical system, but the display is made because the eyeball of the subject is constantly moving. The alignment of the fundus image on the screen is misaligned, and it is necessary to perform accurate alignment each time, and a visual field measurement is performed while observing the fundus using a direct-viewing scope or a fundus camera separately.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a fundus perimeter that can also be used as an automatic central perimeter that does not require constant alignment operation.

[0005]

A fundus perimeter according to the present invention for achieving the above object comprises a light separating member for separating a fundus illumination light and a fundus photographing light provided at a pupil conjugate position by an objective lens, A light splitting member provided between the light splitting member and the objective lens, and an observation means for observing the fundus and anterior ocular segment, and projecting visual field inspection light onto the eye to be inspected through the light splitting member. Is characterized by.

[0006]

The fundus perimeter of the present invention having the above-mentioned structure separates the illumination light and the observation light by the light separating member provided at the pupil conjugate position by the objective lens, and illuminates the fundus of the eye to be examined by the illumination light. The fundus observation is performed by the reflected light from, and the visual field inspection light is projected onto a predetermined part of the eye to be examined through the light splitting member provided between the light separating member and the objective lens to measure the visual field.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows the configuration of the first embodiment, in which an objective lens 1, a switching mirror 2 for partially transmitting near infrared light and reflecting visible light, and a pupil are provided on an optical path 01 in front of an eye E to be examined. An Ep-conjugated perforated mirror 3, a focus lens 4, an imaging lens 5, a switching mirror 6, and a fundus image photographing film camera 7 are sequentially arranged. A relay lens 8, a photographing strobe light source 9, a condenser lens 10, an infrared light transmitting infrared filter 11, and a fundus illumination halogen lamp light source 12 are sequentially arranged in the incident direction of the perforated mirror 3.

A switching mirror 13, a dichroic mirror 14 and a fixation light source 15 are arranged in the reflecting direction of the switching mirror 6, and a relay lens 16 and a television camera 17 are arranged in the reflecting direction of the dichroic mirror 14. There is. Further, in the reflection direction of the switching mirror 2, the dichroic mirror 18, the lens 19, the liquid crystal display panel 2
0, an illumination light source 21 for illuminating the liquid crystal display panel 20 from behind is arranged. The optical path of the dichroic mirror 18 in the reflection direction is connected to the optical path of the switching mirror 13 via the lens 22. Furthermore, the objective lens 1
A plurality of illumination light sources 23, which are infrared LEDs for illuminating the anterior segment of the eye E to be inspected, are provided in the vicinity.

The output of the TV camera 17 is connected to a signal processing controller 24 including a computer and its program and a TV monitor 25, and a mouse 26 for inputting a measurement site.
Is connected to the signal processing controller 24. Also,
The output of the response switch 27 to which the subject responds is connected to the signal processing controller 24, and the output of the signal processing controller 25 is further output from the liquid crystal display panel 20, the television monitor 24, and the printer 2.
8 is connected.

The light flux from the halogen lamp light source 12 is transmitted through the infrared filter 11 by only the infrared light, and the condenser lens 10 forms an image on the strobe light source 9, and the relay lens 8
Thus, a light source image is formed on the perforated mirror 3, and the fundus Er of the eye E to be examined is illuminated through the switching mirror 2 and the objective lens 1.
The reflected light from the fundus Er reverses the optical path, and the objective lens 1, the switching mirror 2, the perforated mirror 3, the focus lens 4,
The fundus image Er ′ is formed on the television camera 17 after passing through the imaging lens 5, reflected by the switching mirror 6, passing through the dichroic mirror 14 and the relay lens 16.

On the other hand, when the fundus image Er 'is photographed by the film camera 7, the switching mirrors 2 and 6 are retracted to the dotted line positions and the strobe light source 9 emits light. When the television camera 17 shoots the fundus image Er 'with visible light, the switching mirror 2
Only the light is retracted from the optical path, and the strobe light source 9 emits light while the switching mirror 6 remains in the solid line position in the figure. The switching mirror 13 is retracted to the dotted line position during fundus observation and fundus imaging.

The fundus image Er 'by the visible light imaged by the television camera 17 is displayed on the television monitor 25 and presented to the examiner at the time of measuring the visual field. The examiner confirms the diseased part while observing the fundus image Er ', and operates the mouse 26 to output the mark M to the measurement site.

On the other hand, during the visual field measurement, the fundus image Er 'by the near infrared light is displayed on the television monitor 25, and the mark M is displayed.
In order to generate the measurement stimulating light at the position, first, the direction of the line of sight at that time is calculated from the fundus image Er 'by the infrared light, and the liquid crystal display panel 20 is calculated from the calculated direction of the line of sight and the position of the mark M. The position where the measurement stimulating light above is generated is determined.

Each time the stimulating light is generated, the direction of the line of sight is calculated from the fundus image Er ′ at that time, and the stimulating light is generated at the position on the liquid crystal display panel 20 selected by the mouse 26. As a result, the stimulating light can be accurately projected onto the fundus portion designated on the still image of the fundus image Er 'by visible light. The direction of the line of sight was calculated from the positions of both the papilla and the thick blood vessel on the fundus image Er 'by infrared light, and the measurement results were obtained.
And outputs it to the video printer 28 with the isopter I or the like.

The luminous flux of the liquid crystal display panel 20 illuminated from behind by the light source 21 is the liquid crystal display panel 20 and the lens 1.
Since the light is parallel between 9 and 9, even if the liquid crystal display panel 20 is moved back and forth as indicated by an arrow P for adjusting the diopter of the eye E, the angle of view does not change. The designation of the mark M by the mouse 26 may be performed for each measurement,
The range of the diseased part may be designated, and the range may be automatically designated so as to cover the range at equal intervals.

When used as a normal perimeter, it is performed while observing the anterior segment of the eye. The infrared light from the illumination light source 23 illuminates the anterior ocular segment of the eye E to be examined, and the reflected light thereof is the objective lens 1, the switching mirror 2, the dichroic mirror 18, the lens 22, the switching mirror 13, and the dichroic mirror 1.
4, the image passes through the relay lens 16 and the anterior segment image F is captured by the television camera 17 as shown in FIG. FIG. 3 shows the screen of the TV monitor 25 during the visual field measurement. The anterior ocular segment image F reflected on the TV camera 17 is displayed on the small screen 25a, and the main screen displays the visual field view and the measurement result as the measurement progresses. To be done.

The stimulating light for measuring the visual field is the liquid crystal display panel 20.
And is presented to the subject in a preprogrammed sequence, and the subject responds by pressing the response switch 27 when visually recognizing this. In addition, the position of the fixation light source 15 is not fixed to the center position on the liquid crystal display panel 20, but is indicated by the arrow S.
It is possible to measure a wider field of view by moving the display like. Further, it is possible to generate background light on the liquid crystal display panel 20, and it is possible to perform measurement with light adaptation when used as an ordinary perimeter. The fixation mark may be presented in black, but if a color television monitor is used as the liquid crystal display panel 20, it is possible to change the color and perform the inspection.

FIG. 4 shows a second embodiment in which a lens 29 for observing the anterior segment of the eye which can be inserted and removed on the fundus observing optical path and a switching mirror 30 which reflects visible light and transmits infrared light are arranged. The other configurations are the same as those in the first embodiment. Therefore, FIG.
The anterior ocular segment observation system such as the dichroic mirror 18, the lens 22, and the switching mirror 13 is unnecessary.

The television camera 17 is sensitive to visible light and near infrared light, and the strobe light source 9 emits visible light. When near infrared light is included, the infrared cut filter is illuminated at the time of shooting. Or insert it in the photographic optical system. Further, if a color television is used, the diseased part can be more easily recognized on the television monitor 25. When using a three-plate color television camera, the R channel is also used for infrared images.

When used as a fundus perimeter, the static fundus image Er 'by visible light may not be used, and the fundus image Er' by infrared light may be measured while observing as in the conventional case. In this case, it is not necessary to calculate the direction of the line of sight. Further, the film camera 7 is not always necessary, and if the switching mirror 2 is a half mirror for visible light, the mirror 2 can be fixed on the optical path.

[0021]

As described above, the fundus perimeter according to the present invention includes the light splitting member provided between the objective lens and the light splitting member for splitting the fundus illumination light and the fundus photographing light. By projecting the visual field inspection light on the eye, visual field measurement can be performed while monitoring the anterior segment of the eye under light adaptation, and alignment operation during measurement is unnecessary. Further, the visual field can be measured by accurately projecting the predetermined measurement stimulating light while observing the fundus image.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is an explanatory diagram of a front eye image of a television camera.

FIG. 3 is an explanatory diagram of a screen on a television monitor.

FIG. 4 is a configuration diagram of an optical system according to a second embodiment.

[Explanation of symbols]

 2, 6, 13, 30 Switching mirror 7 Film camera 9, 12, 15, 21, 23 Light source 14, 18 Dichroic mirror 17 Television camera 20 Liquid crystal display panel 24 Signal processing controller 25 Television monitor 26 Mouse 27 Response switch 28 Printer

Claims (1)

[Claims] 1. A light separating member for separating fundus illumination light and fundus photographing light provided at a pupil conjugate position of an objective lens, and a light splitting member provided between the light separating member and the objective lens.
A fundus perimeter, which has an observation unit for observing a fundus and an anterior segment of the eye, and projects visual field inspection light onto an eye to be inspected through the light splitting member.