Visual acuity tester with improved test character generation
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United States of America Patent
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Mar 9, 1999
Grant Date -
N/A
app pub date -
Oct 30, 1996
filing date -
Oct 30, 1996
priority date (Note) -
Expired
status (Latency Note)
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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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