Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1990-10-15
1993-09-07
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351212, 351214, A61B 310
Patent
active
052433684
ABSTRACT:
An ophthalmologic apparatus equipped with a projection optical system for projecting a laser beam spot image onto a prescribed point of an eye under examination has a zoom lens provided in the projection optical system for enabling the diameter of the projected spot image to be varied and some of the lenses of the zoom lens are made movable for enabling projection of a blurred spot image.
REFERENCES:
patent: 3703176 (1972-11-01), Vassiliadis et al.
Ito Kosuke
Koike Chikashi
Nakano Hirokatsu
Adams Bruce L.
Bovernick Rodney B.
Dang Hung Xuan
Kowa Company Ltd.
Wilks Van C.
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