Instrument and method for use in optometric examinations

Details Instrument and method for use in optometric examinations Instrument and method for use in optometric examinations

1991-03-07

1993-03-02

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351203, 351239, A61B 302

Patent

active

051913674

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.

REFERENCES:
patent: 2282494 (1942-05-01), Potter
patent: 4212520 (1980-07-01), Klimsa
patent: 4421392 (1983-12-01), Crick et al.
patent: 4611893 (1986-09-01), Schrier
patent: 4764007 (1988-08-01), Task

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