Instrument and method for use in optometric examinations
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United States of America Patent
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-
Mar 2, 1993
Issued Date -
N/A
app pub date -
Mar 7, 1991
filing date -
Dec 12, 1988
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An optical instrument for use in conducting optometric examinations which generates an alphanumeric type display simulating the optical features of displays provided by video display terminals. The instrument comprises a light source and a multi-layered screen through which light from the source may be transmitted. The screen employs light from the source in forming characters which are comprised of pixel-like light elements similar to those making up VDT generated characters. Further, the screen is operative for degrading the image quality of the characters by transforming the light elements into Gaussian type spatial profiles typical of the pixels generated by VDTs.
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Cited Art Landscape
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