JPS59186538A - Ophthalmic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an ophthalmological device that detects the blinking of an eye to be examined and the distance between the eye to be examined and an instrument in an instrument that photographs the fundus of the eye, measures the refractive power of the eye, and the shape of the cornea. It is related to.

Observation and photography of the fundus are widely practiced not only in ophthalmological diagnosis but also in the field of adult disease screening, such as hypertension and diabetes testing, and non-mydriatic fundus cameras are becoming particularly popular in the field of adult disease screening. However, in the case of this non-mydriatic fundus photography, once the photographing light is emitted, miosis occurs, and it is necessary to wait for the pupil to naturally dilate again, and it is difficult to obtain good photographic results. If this is not possible, there is a huge waste of time in reshooting. Therefore, how to prevent failure due to blinking of the eye to be examined becomes a serious problem.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an ophthalmological apparatus that detects whether or not the subject's eye blinks and also stops the emission of light from a photographing light source. , an apparatus equipped with a means for illuminating the eye to be examined for observation or photography, and a means for receiving the reflected light,
It has a means for projecting a light beam for eyelid detection toward the subject's eye, and a means for receiving the reflected light of the detection light flux from the subject's eye. It is characterized by ensuring operation 61.

FIG. 1 is a block diagram showing an embodiment of the present invention applied to a fundus camera. Reference numeral 1 denotes a room light source consisting of a tungsten lamp, and the light emitted from this observation light source 1 is transmitted through a condenser lens 2a, The light enters a mirror 5 through an infrared filter 3, a photographing light source 4 consisting of a Canon discharge tube, etc., a condenser lens 2b, is deflected there, and is then sequentially passed through a ring slit plate 6, relay lenses 7a and 7b, and then perforated. It is designed to reach mirror 8. The light that enters the perforated mirror 8 from the above-mentioned illumination optical system is reflected by the perforated mirror 8 in the direction of the eye E to be examined, illuminates the fundus Ef of the eye E, returns to the original optical path, and then returns to the perforated mirror 8. and reaches the observation optical system. Hole mirror 8 and eye to be examined E
An objective lens 9 is arranged between the apertured mirror 8 and a focusing lens 10 along the optical axis.
, photographing lens 11, flip-up mirror 12, shutter 13
, photographic films 14 are arranged in sequence. On the reflective side of the flip-up mirror 12, there are field lenses 15 placed sequentially along the optical axis at positions conjugate with the photographic film 14.
, a mirror 16 for changing the optical path, a TV lens 17, and an image pickup tube 18 are arranged.

Further, a time detection illumination light source 19 is arranged on the side of the objective lens 9, and a mask plate having a slit-shaped opening 20a as shown in FIG. 2o, photographing lenses 21 are arranged in sequence so that the reflected light from the anterior segment of the subject's eye enters an image receiving lens 22 and a line sensor 23 placed symmetrically with the illumination light source 19 across the objective lens 9; It has become.

In this fundus camera, the illumination light source 1 and the photography light source 4 are almost conjugate with respect to the condenser lens 2a, and the observation light source 1 is turned on during observation, and the photography light source 4 is turned on during photography.
or it will turn on instantly. The light source image is once formed near the ring slit plate 6 by another condenser lens 2b,
Next, an image of the annular opening of the link slint plate 6 is formed in the vicinity of the listening mirror 8 by the relay lenses 7a and 7b.

Here, the illumination light is reflected and travels to the left. Then, after forming an image of the annular aperture near the corner 11 of the eye E to be examined using the objective lens 9, the fundus Ef is illuminated.

The reflected light from the fundus Ef travels to the right and passes through the cornea and objective lens 9.
After the light is once formed into an image, it passes through the perforated mirror 8 and is focused and imaged by the focusing lens 10 and the photographing lens 11. During observation, the fundus image is guided upward by the flip-up mirror 12 located at the solid line position, and is converted into an image by the imaging v18 via the TV lens 17. When photography is performed, the flip-up mirror 12 rotates to the dotted line position, and the fundus image is The image is formed on the photographic film 14 via the opened shutter 13.

The optical system from the illumination light source 19 to the line sensor 23 is for detecting dust, and the detection luminous flux emitted from the illumination light i19 is transmitted to the line sensor 23 of the mask plate 20.
After passing through 0a, it becomes a slit-shaped light beam at the photographing lens 21,
As shown in FIG. 3, the iris of the eye E to be examined is illuminated. Then, the reflected light of the slit illumination light on the iris Ei is projected onto the line sensor 23 via the image receiving lens 22. The slit illumination section P1 on the iris Ei is 0 on the line sensor 23.
Image is formed at position 1. Here, if the eye E to be examined blinks, the slit illumination section moves to the eyelid El, and the imaging position of the slit illumination section P2 on the eyelid E1 on the line sensor 23 is as shown in FIG. Move to 02. Therefore, when you blink, the illumination area on the line sensor 23 is Q
It shifts from l to 02, and is detected as a movement on the coordinates by the line sensor 23-hi. This signal can be connected to a display means (not shown) to issue a warning by emitting light or making a sound, or to stop the light emission of the photographing light source 4.

Although the system described above is a blink detection mechanism, it can also be used as an alignment mechanism for a fundus camera. That is, the distance interval between the eye E to be examined and the objective lens 9 directly corresponds to the image position on the line sensor 23, and by setting that position in advance, it is possible to judge whether the distance interval is appropriate. It is. This distance interval can also be displayed on another display means, such as a display on a TV monitor.

Further, in the above embodiment, the illumination light for eyelid detection from the illumination light source 19 is projected without using the objective lens 9, but it is also possible to project and receive the image through the objective lens 9. FIG. 5 shows an example in that case,
The light flux emitted from the illumination light source 19 passes through a mask 20 and a photographing lens 21 to become slit light, passes through an objective lens 9, and forms a slit illumination portion on the eye E to be examined. The reflected image of this illumination section passes through a deflection mirror 24 and a slit opening 25 arranged immediately after the objective lens 9, and reaches the line sensor 23, where a luminous flux is projected onto the image receiving position Ql or Q2. In addition, 1. In this embodiment, the projection position of the luminous flux is set to the iris Ei, but the normal membrane portion can also be used. Furthermore, in order to distinguish it from the function of the original fundus camera, it is also possible to use a method such as using light in a wavelength range different from the observation light source 1 and photographing light #4, which are used for observation and photographing, for the wavelength of the light beam for eyelid detection. Needless to say. Furthermore, in addition to application to a fundus camera, the present invention can also be applied to, for example, an eye refractive power measuring device or a corneal shape measuring device, and may be used to select or delete measured data.

As described above, the ophthalmological apparatus according to the present invention can easily detect blinking of the eyelid by detecting the difference in the position of the irregularity on the eye to be examined, and can detect erroneous operations in fundus photography and ophthalmological measurements. It will be effective.

[Brief explanation of the drawing]

The drawings show an embodiment of the ophthalmological apparatus according to the present invention, in which Fig. 1 is an optical arrangement thereof, Fig. 2 is a front view of the mask, Fig. 3 is an explanatory diagram of the operation of the blink detection mechanism, and Fig. 4 is a line diagram. FIG. 5, which is an explanatory diagram of image movement on the sensor, is an optical layout diagram of another embodiment of the blink detection mechanism. 1 is an observation light source, 4 is a photographic light source, 6 is a ring slit plate, 8 is a perforated mirror, 9 is an objective lens, 12 is a flip-up mirror, 14 is a photographic film, 19 is an illumination light source, 20
2 is a mask plate, 21 is a photographing lens, 22 is an image receiving lens, 2
3 is a line sensor, 24 is a deflection mirror, 25 is a slit aperture, E is the eye to be examined, Ef is the fundus, El is the iris, El is the eyelid, Pl and P2 are the illumination units, and Ql and Q2 are image receiving positions.

Claims (1)

[Scope of Claims] 1. An apparatus comprising a means for illuminating the eye to be examined for observation or photography and a means for receiving the reflected light, comprising means for projecting a light beam for eyelid detection toward the eye to be examined; 1. An ophthalmologic apparatus, comprising means for receiving reflected light of the eyelid detection light beam from an eyelid test, and the operation of the apparatus is confirmed from the position at which the reflected light is received by the light receiving means. 2. The ophthalmologic apparatus according to claim 1, wherein the eyelid detection light beam has a slit shape. 3. The ophthalmological device according to claim 1, in which the operation of the device is confirmed by the blinking of the eye to be examined. The ophthalmological device according to scope 1. 5. Claim f51 in which a warning means is activated when the image receiving position of the reflected light deviates from a predetermined position.
Ophthalmological devices as described in Section. 6. The ophthalmological apparatus according to claim 1, wherein part or all of the functions are stopped when the image receiving position of the reflected light deviates from a predetermined position.