Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1988-12-12
1991-03-12
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351203, 351239, A61B 302
Patent
active
049988204
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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Coffman Steven G.
Murch Gerald M.
Salibello Cosmo
Torrey Jonathan G.
Applied Vision Concepts, Inc.
Dzierzynski Paul M.
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