Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1995-07-17
1996-04-02
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
354 62, A61B 314, G03B 2900
Patent
active
055045430
ABSTRACT:
The ophthalmic photographing apparatus of the present invention is provided with an illuminating optical system for applying illuminating light to the fundus oculi of an eye to be examined, a photographing and observation system for receiving reflected light from the fundus oculi of the eye to be examined and photographing and observing the fundus oculi of the eye to be examined, an index projecting optical system for projecting an index onto the fundus oculi of the eye to be examined, a focus detection optical system for receiving the index of the fundus oculi of the eye to be examined and detecting focus information, a focusing operation system for moving a focusing relay lens along the optical axis thereof on the basis of the focus information to thereby focus the photographing and observation system on the fundus oculi of the eye to be examined, and control means for temporarily positioning and holding the focusing relay lens at a point of time whereat an in-focus state has been detected on the basis of the focus information.
REFERENCES:
patent: 4452517 (1984-06-01), Kohayakawa
Mai Huy
Nikon Corporation
Sikes William L.
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