Visual acuity test device and method of preparing same

Details Visual acuity test device and method of preparing same Visual acuity test device and method of preparing same

1989-03-29

1990-11-06

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

A61B 302

Patent

active

049681311

ABSTRACT:
A visual acuity testing device and method of preparing same are provided, the device being in the form of an optotype as well as a series of optotypes of the same nature, each of which is defined according to a rectangular optotype gridwork including a plurality of rectangular unit areas of contrasting colors or differing contrast properties that are varied in coloration or contrast as desired in order to form a set of optotype characters that exhibit similar peripheral shapes that vary from one another to define readily recognizable optotype characters.

REFERENCES:
patent: 1412902 (1922-04-01), Tallman
patent: 1999054 (1935-04-01), Lee
patent: 3011394 (1961-12-01), Sherman et al.
patent: 3738099 (1973-06-01), Tanaka
patent: 3922667 (1975-11-01), Ueda et al.
patent: 3982239 (1976-09-01), Sherr
patent: 4607923 (1986-08-01), Task et al.
patent: 4854695 (1989-08-01), Lewis

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