JPS6216090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fundus camera capable of electrophysiological diagnosis.

Although there is a physiologically significant relationship between the fundus image obtained by a fundus camera and the electroretinogram of the eyeball, conventionally they have been measured and observed at different times using independent detection devices.

The purpose of the present invention is to simultaneously detect these two pieces of information and record them on the same recording medium.
The object of the present invention is to provide a fundus camera capable of electrophysiological diagnosis, which allows the fundus image and the electroretinal image to correspond easily, and enables accurate physiological diagnosis. a fundus image photographing optical system that projects a fundus image by light irradiation onto an image recording medium; a means for displaying electrical information obtained by optical stimulation of the fundus of the subject's eye from the photographing light source as an electroretinogram; and the display. The apparatus is characterized by comprising a projection optical system that projects into the fundus image projection optical system so that the electroretinogram displayed by the means is recorded on the image recording medium together with the fundus image.

The present invention will be explained in detail based on illustrated embodiments.

FIGS. 1a and 1b show the principle explanatory diagram of a fundus camera capable of electrophysiological diagnosis according to the present invention,
The fundus camera placed just in front of the eye E is equipped with an objective lens 1,
Perforated mirror 2, photographic aperture 3, focusing lens 4, imaging lens 5, and quick return mirror 6
is located. As shown in FIG. 1, a condenser lens 7, an optical path bending mirror 8, and an eyepiece 9 are arranged on the reflection side of the quick return mirror 6, which is descending, and the observer e looks into this eyepiece 9. It is now possible to confirm the fundus E _f in the eye E to be examined. On the other hand, illumination from a halogen lamp 10 serving as observation illumination or a xenon tube 11 serving as photography illumination enters the perforated mirror 2 to illuminate the inside of the eye E to be examined. This fundus illumination optical system starts from the halogen lamp 10 side with the perforated mirror 2.
A condenser lens 12, a xenon tube 11, another condenser lens 13, an annular slit plate 14, and an optical path bending mirror 15 are arranged in order toward the
Illumination light from a halogen lamp 10 or a xenon tube 11 is bent by this mirror 15 and enters the perforated mirror 2 via a filter 16, an aperture 17, and a relay lens 18. In addition, halogen lamp 10
is designed to be able to stop emitting light as appropriate to create a dark-adapted state. The diaphragm 17 moves in the optical axis direction in conjunction with the focusing lens 4 for adjusting the diopter, and apart from being always maintained conjugate with the fundus, the aperture diameter can be changed from outside the device. By making it movable in a plane perpendicular to the optical axis, the field of view of the fundus E _f or the range of optical stimulation can be changed. Furthermore, the slit plate 14
In order to eliminate the reflection of _c , a ring slit 14a shown in FIG.
The emitted light from the halogen lamp 10 and the xenon tube 11 is once condensed onto a slit plate 14 by condenser lenses 12 and 13. Further, the filter 16 is inserted into the illumination optical system as necessary, and by using various color filters or bandpass filters, it is possible to apply arbitrary spectral stimulation to the eye E to be examined.

Further, a contact lens ₂₀ having a first electrode 19 made of a metal ring embedded in the inner surface can be attached to the cornea E c of the eye E to be examined, and a contact lens 20 is attached to the cornea E c of the eye E to be examined. The potential difference caused by optical stimulation from the xenon tube 11 is amplified by an amplifier 22 and displayed as an image on an oscilloscope 23.

Because the optical position of the pupil moves due to the action of the positive power contact lens 20 attached to the eye E, the slit plate 14 is adjusted to accommodate this movement.
The mirror 15 moves along its optical axis either alone or together with an optical system closer to the light source. In addition, since the imaging position of the normal eye, where the intermediate image of the fundus E _f is formed, also moves accordingly, the focal range of the focusing lens 4 must be changed accordingly, or a negative lens for position guarantee may be used. When the halogen lamp 10 is turned on after being inserted between the aperture 3 and the focusing lens 4 for focusing, the light emitted from the lamp 10 passes through the ring slit 14 of the slit plate 14.
a is irradiated, subjected to an imaging action by the relay lens 18, reflected by the perforated mirror 2, and once passed through the ring slit 14a.
A clear image is formed. Furthermore, the illumination light is from objective lens 1.
The image is formed on the pupil and illuminates the fundus E _f . In this case, if the contact lens 20 is present, the illumination light will illuminate the fundus E _f with a wide angle of view. Next, the light beam having fundus image information emitted from the fundus E _f is convergently refracted by the contact lens 20 when exiting from the eye E to be examined, and is directed by the objective lens 1 to the midpoint between the objective lens 1 and the perforated mirror 2. An image E _f 1 is formed as an intermediate image. The light beam that has formed this intermediate image E _f 1 is further narrowed down by an aperture 3 , passes through a focusing lens 4 , and is imaged by an imaging lens 5 . This image consists of a quick return mirror 6, a condenser lens 7,
It is visually observed by the observer e via the optical path bending mirror 8 and the eyepiece lens 9.

Also, instead of the halogen lamp 10, a xenon tube 1 is used.
1 momentarily lights up, quick return mirror 6
When the fundus image is raised and moved out of the optical path, the fundus image is formed as an image E _f 2 behind the quick return mirror 6, and is exposed onto the photographic film 24. On the other hand, on the screen of the oscilloscope 23, the potential of the cornea E _c due to optical stimulation based on the flash light of the xenon tube 11 is detected by the first and second electrodes 19 and 21, and this potential, that is, the electroretinogram is imaged. It turns out.

FIG. 2 is a configuration diagram of the fundus camera according to the present invention, and the same reference numerals as in FIG. 1 indicate the same parts and members, and the illumination optical system in FIG. 1 is omitted in the drawing. . However, 17' is a mask having a desired shape, such as a semicircle or a plurality of openings,
It can be replaced and removed, and when inserted, it can move in the optical axis direction in conjunction with the focusing lens 4, and can also be displaced in a plane perpendicular to the optical axis. An instant development camera 25 is arranged behind the quick return mirror 6, and this camera 25 includes a field lens 26, a photographic lens 27,
It has an instant development film 28. On the other hand, the electroretinogram obtained by the electrodes 19 and 21 is converted into an image by a television cathode ray tube 29 instead of the oscilloscope 23 in FIG.
and is projected onto the camera 25 via the reflecting mirror 31.

Therefore, one instant development film 2 of the camera 25
8, a fundus image 32 and an electroretinogram 33 as shown in FIGS. 3a and 3b are imprinted, and are immediately converted into images, allowing diagnosis of fundus diseases etc. to be made quickly and extremely accurately. You will get it.

In the above embodiment, the contact lens 2
Although the subject's eye E, which is covered with a lens 0, is the subject's eye, there is no problem in imaging even if the contact lens 20 is removed and the naked eye is used. Also, a camera 25 for instant development film is used as the image recording medium;
Of course, there is no problem in using ordinary film, and a VTR may also be used. Furthermore, both images can be projected onto the camera 25 by bending them off the main optical axis using a reflecting mirror, and an optical fiber may be used to transmit the images. Electroretinogram imaging can be miniaturized by using a thin plate type device such as a liquid crystal TV instead of the cathode ray tube 29, or by attaching a contact lens to the end of the lens barrel of the objective lens 1. A new objective lens may be constructed including this contact lens by attaching it permanently.

As explained above, the fundus camera capable of performing the electrophysiological diagnosis method according to the present invention is capable of outputting fundus images and electroretinograms, which were conventionally obtained independently, onto a single recording medium at the same time. This has great advantages in terms of diagnosis and organization because it can be recorded together.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle of the present invention, FIG. 2 is a configuration diagram of a fundus camera according to the present invention, and FIG. 3 is a film image obtained with the fundus camera of the present invention. 1 is an objective lens, 2 is a perforated mirror, 3 is an aperture,
4 is a focusing lens, 6 is a quick return mirror, 10 is a halogen lamp, 11 is a xenon tube, 14 is a slit plate, 17 is an aperture, 20 is a contact lens, 25 is a camera, 28 is an instant development film, 29 is A cathode ray tube, 30 a projection lens, E the eye to be examined, and E _f the fundus.

Claims (1)

[Scope of Claims] 1. A fundus image photographing optical system that projects a fundus image onto an image recording medium by light irradiation from a photographing light source, and electrical information obtained by optical stimulation of the fundus of the subject's eye from the photographing light source. means for displaying the electroretinogram as an electroretinogram; and a projection optical system for projecting the electroretinogram displayed by the display means into the fundus image projection optical system so as to record the electroretinogram together with the fundus image on the image recording medium. A fundus camera capable of electrophysiological diagnosis. 2. A fundus camera capable of electrophysiological diagnosis according to claim 1, wherein the image recording medium is a film. 3. A fundus camera capable of electrophysiological diagnosis according to claim 1, wherein the electroretinogram is obtained by obtaining electrical information from an electrode attached to a powerful contact lens and converting the image into an image.