Hand-held device for contrast and multifunction vision testing

Details Hand-held device for contrast and multifunction vision testing Hand-held device for contrast and multifunction vision testing

2008-02-04

2010-12-28

Dinh, Jack (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S233000, C351S234000, C351S239000, C351S244000

Reexamination Certificate

active

07857450

ABSTRACT:
A vision testing device for measuring single or multiple visual functions consisting of an internally illuminated hand-held instrument, vision charts, vision correcting and occluding elements, a testing frame for holding combined vision correcting and blocking elements, and modular accessories.

REFERENCES:
patent: 5398085 (1995-03-01), Hofeldt

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