Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1992-07-27
1993-11-02
Arnold, Bruce Y.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, 351221, 359432, A61B 310
Patent
active
052587878
ABSTRACT:
In an ophthalmologic apparatus comprises an illumination optical system for directing illumination light onto a prescribed point of an eye under examination, and an observation optical system for observing an image of the prescribed point of the eye under examination formed through an object lens. The object lens is movably supported along its optical axis between a first position at which the image point falls at its object point and a second position at which the prescribed point of the eye under examination falls at its image point. As a result, there is a change in the conjugate relationship so that a sharply focused image can be observed when the object lens is at either position thereby making it possible to observe sharply focused images of different magnifications simply by moving the object lens.
REFERENCES:
patent: 3259039 (1966-07-01), Okajima
patent: 3535027 (1968-07-01), Littmann et al.
patent: 4779969 (1988-10-01), Sato et al.
Ito Kosuke
Suzumura Yoshikatsu
Adams Bruce L.
Arnold Bruce Y.
Dang Hung Xuan
Kowa Company Ltd.
Wilks Van C.
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