Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1991-09-11
1993-04-06
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351215, 351221, A61B 310
Patent
active
052007723
ABSTRACT:
A retinoscope is provided with a hinged light filter carrier assembly for slidably positioning first and second polarizing filters in the light transmission and viewing passageways. A single actuating lever is provided to move the light filter members into operative position and to retract them out of alignment with the viewing passageways.
REFERENCES:
patent: 4998818 (1991-03-01), Kugler et al.
Monroe Richard A.
Perkins David G.
Bovernick Rodney B.
Dang Hung Xuan
Welch Allyn Inc.
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