Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1996-11-06
1998-09-01
Dang, Hung Xuan
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351237, A61B 302
Patent
active
058018093
ABSTRACT:
The present invention is an improvement over existing methods of testing a patient for color perception. The present invention provides a means by which color perception can be tested at the same time that visual acuity is measured. The eye chart with color vision screening comprises a chart which displays objects of progressively smaller sizes with the larger sized objects being displayed in color in order that color perception can be measured and with the smaller objects displayed black on the white background in order that the chart's effectiveness as a tool for measuring visual acuity is not reduced.
REFERENCES:
patent: 1412902 (1922-04-01), Tallman
patent: 2184929 (1939-12-01), Bigelow
patent: 2190008 (1940-02-01), Beitel
patent: 2200595 (1940-05-01), Diggins
Dang Hung Xuan
Thompson, Esquire Robert D.
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