Ophthalmoscope with automatic lens shifting mechanism

Details Ophthalmoscope with automatic lens shifting mechanism Ophthalmoscope with automatic lens shifting mechanism

1984-07-09

1987-02-17

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351218, A61B 310

Patent

active

046435468

ABSTRACT:
An ophthalmoscope having two lens discs one of which has three different lenses and the other of which has twenty-three different lenses. There is a viewing path through the instrument and, in use, one lens in each disc will always be in registry with the viewing passage. The two lens discs in combination provide sixty-nine different diopters ranging from -30 to +38 diopters. The lens discs have a common axis of rotation and are spaced apart so as to permit a cam plate to be positioned between the discs in close proximity to each. The cam plate is operable to provide an automatic lens shifting mechanism for the pair of lens discs.

REFERENCES:
patent: 2195169 (1940-03-01), Graff
patent: 2785598 (1957-03-01), Kirchhubel
Jones, Ingenious Mechanisms for Designs and Inventions, Industrial Press, Inc., pp. 74-77, 1930.

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