Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1996-10-30
1999-03-09
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351237, A61B 302
Patent
active
058808140
ABSTRACT:
A visual acuity tester based on a personal computer is provided that is capable of displaying visual acuity test characters at varying sizes on a monitor. The visual acuity tester antialiases the test characters to overcome the effects of staircase distortion. Preferably, the visual acuity tester performs unweighted area sampling antialiasing. The visual acuity tester also centers the test characters relative to the pixel array of the monitor to improve the appearance of the test characters. The test characters can be centered relative to either the center of a pixel or the corner of a pixel (a pixel coordinate). Test characters can also be centered relative to a pixel center in one dimension and a pixel coordinate in the other dimension.
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McKnight Robert Nelson
Starr John Donal
Tolksdorf Kurt Paul
Waltuck Morey Herbert
Mai Huy
Mentor Corporation
Treyz G. Victor
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