Visual acuity testing

Details Visual acuity testing Visual acuity testing

2008-09-23

2008-09-23

Hasan, M. (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S246000

Reexamination Certificate

active

11489031

ABSTRACT:
Eye chart for testing visual acuity which includes a plurality of optotypes arranged in a plurality of lines with each optotype in a line having a uniform resolution throughout and the resolution for each optotype in a given line is the same. The optotypes are generated by standardizing the maximum resolution angle any one letter may have and such is done by utilization of a design circle which represents the maximum resolution.

REFERENCES:
patent: 1879833 (1932-09-01), Tillyer et al.
patent: 1999054 (1935-04-01), Lee
patent: 4854695 (1989-08-01), Lewis
patent: 4968131 (1990-11-01), Lewis
patent: 5129720 (1992-07-01), Jovicevic
patent: 5416540 (1995-05-01), Hayashi
patent: 5568209 (1996-10-01), Priester et al.
patent: 5880814 (1999-03-01), McKnight et al.
patent: 6142631 (2000-11-01), Murdoch et al.
patent: 6379007 (2002-04-01), Farb
patent: 6808267 (2004-10-01), O'Neil et al.

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