Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1991-10-31
1993-06-15
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351239, 351243, A61B 302
Patent
active
052203620
ABSTRACT:
An ophthalmic lighting apparatus for operable attachment to ophthalmic articles, such as ophthalmic refractors, which articles are capable of supporting and deploying a protruding reading card rod, a reading card holder and accordingly a reading card during an ophthalmic examination. An illumination member is operably attached to one or more of the components of the reading card assembly for providing a controlled and standardized amount of light to the reading card. A position sensitive switch is interposed between a power source and the illumination member for automatically switching a light source upon movement of the reading card rod from a vertically protruding pre-ophthalmic examination position to a substantially horizontal protruding ophthalmic examination position.
REFERENCES:
patent: 4222639 (1980-09-01), Sheedy
P. 54 from 1989-1990 Frames Product Guide, Ophthalmic Instrument & Equipment Catalog.
P. 181 from 1987 WCO Ophthalmic & Surgical Instrument Catalog.
P. 54 from 1961 Opthalmic Instrument Handbook Catalog.
P. 56 from 1961 Ophthalmic Instrument Handbook Catalog.
P. 106 from 1961 Ophthalmic Instrument Handbook Catalog.
Bovernick Rodney B.
Dang Hung Xuan
Woodlyn Inc.
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