Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1987-09-08
1989-08-29
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351246, A61B 302
Patent
active
048611565
ABSTRACT:
A visual acuity testing system includes a patient video display operated under control of a compact control unit which is located adjacent the phoropter used in acuity testing. The control unit and phoropter are located in a common operating area, thus eliminating the need to shift from one position to another to operate different devices during visual acuity testing. The control unit operates in conjunction with a graphics interface processor to provide random character generation, variable character contrast, duochrome testing, automatic timing of character display, audio prompting and generation of complex test patterns such as an astigmatic clock pattern. The use of high resolution bit-mapped and vector graphics generation techniques maximizes the quality of character displayed on the patient display unit.
REFERENCES:
patent: 1698013 (1929-01-01), De Zeng
patent: 2190008 (1940-02-01), Beitel
patent: 2937567 (1960-05-01), Hardy et al.
patent: 4239351 (1980-12-01), Williams et al.
patent: 4293200 (1981-10-01), Dobson et al.
patent: 4526452 (1985-07-01), Hirsch
"B-VAT Video Acuity Tester", advertisement.
"Hoya Vision Chart"-advertisement, Jan. 1982.
"A Computer-Based Automatic Method for Determining Visual Acuity", Edward R. F. W. Crossman et al, pp. 344-355, Dec. 1969.
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