Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1995-10-27
1998-09-22
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351210, 351212, 396 18, A61B 314
Patent
active
058122400
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
The present invention relates to an eyeball observing device used for observing eyeball portions and measuring the position thereof. More particularly, it relates to an eyeball observing device in which the leading end of the object lens group comes in contact with the eyeball, the device being used for observing each portion of the eyeball such as retinal, vitreous body, front face of crystalline lens, rear face of crystalline lens, corneal endothelium and corneal epithelium.
For a conventional eyeball observing device, the one disclosed in Japanese Unexamined Patent Publication No. 31077/1993 is known. As shown in FIG. 5, this eyeball observing device 1 comprises an illuminating optical system 7 for illuminating the eye portion to be examined; an eyepiece group 4; a photographing optical system 2 comprising a object lens group 8 provided with a cone lens 15 in contact with the eyeball 6 and an imaging lens group 9 which allow image beams reflected from the eyeball portion to be examined to reach an imaging surface 10; and a motion picture camera 3. Numeral 11 denotes a convex lens group, 12 a concave lens group, 13 a motor for moving the convex lens group 11 along an optical axis, and 14 a rotary encoder for counting number of revolution of the motor 13.
When the image beam reflected from the eye portion to be examined is formed on the imaging surface 10, adjustment is carried out to increase clearness of the image from the motion picture camera 3 by driving the motor 13 to move the convex lens group 11 on the optical axis.
With the above-mentioned conventional eyeball observing device, the examiner moves a part of the imaging lens 9 of the photographing optical system 2 while monitoring the image in order to make the image from the motion picture camera 3 clear. However, because this movement is performed by an electrically connected switch (not shown), it takes time and moreover, during this period, the lamp which illuminates the eyeball to be examined is kept illuminating, thereby creating a problem that a person to be examined is dazzled and is given a large load. Further, every time the eye to be examined moves, the switch must be operated, which also gives a large load to the examiner.
DISCLOSURE OF THE INVENTION
An eyeball observing device according to the present invention comprises an illuminating optical system for illuminating a portion to be examined; a photographing optical system comprising an object lens group equipped with a transparent body which is designed to be in contact with the eyeball and an imaging lens group, the system allowing the image beams coming from the portion to be examined to reach an imaging surface; and a motion picture camera, wherein an ultrasonic oscillator for detecting the position of the eye to be examined is mounted on the transparent body.
The device might be equipped with a moving means for moving at least one of an optical member of the photographing optical system and a motion picture camera on the optical axis based on detection results of the position of the eye to be examined which have been detected by the ultrasonic oscillator.
According to the present invention, since an ultrasonic oscillator for detecting the position of the eye to be examined is equipped to the transparent body in contact with the eyeball in the object lens group, only by measuring the time in which ultrasonic generated from the ultrasonic oscillator is reflected at the object and returns, quick and accurate detection of the position of a desired portion can be achieved. If the examiner adjusts manually or electrically the photographing optical system and the like based on this detection result of the position in such a manner to form an image on the imaging surface, the image of the desired portion can be obtained quickly and clearly.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic representation of an optical path showing an embodiment of an eyeball observing device according to the present invention;
FIG. 2 is a block diagram showing a system config
REFERENCES:
patent: 4764006 (1988-08-01), Hamano et al.
patent: 5325135 (1994-06-01), Nakamura et al.
patent: 5337094 (1994-08-01), Mizuno et al.
Teraoka Kota
Yoshikawa Masao
Mai Huy
Tomey Corporation
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