Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1986-05-29
1987-06-02
Buczinski, Stephen C.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351222, 351240, A61B 302
Patent
active
H00002933
ABSTRACT:
A portable visual function tester and testing method is described for rapid and accurate measurement of several human vision parameters, including critical fusion frequency, stereopsis, Snellen visual acuity and visual resolution, cyclophoria, eye dominance, and lateral and vertical phoria, which comprises, first and second illuminated visual displays disposed for viewing by respective left and right eyes of a subject along respective parallel first and second optical axes, each display comprising an array of visual display patterns, one pattern of each display comprising a pair disposed for simultaneous viewing by the subject in the measurement of a corresponding vision parameter; the display patterns include an illuminated blinking disk for measurement of critical fusion frequency, a rectangular array of four-dot sets for measurement of stereopsis, an array of Snellen E designs of various sizes and orientations for measurement of visual acuity, and a resolution fan comprising a pattern of a plurality of radially extending alternate bright and dark luminance areas for measurement of minimum visual resolution; the visual display pairs include a first pair including a first circle with adjacent reference mark and a second circle with adjacent reference scale for measurement of cyclophoria, a second pair including two sets of oppositely oriented diagonal lines for determination of eye dominance, and a third pair including an illuminated dot and illuminated rectangular grid for testing of lateral and vertical phorias; suitable electronics are included for selectively illuminating the display patterns in pairs.
REFERENCES:
patent: 2326965 (1943-08-01), Neumueller
patent: 3532418 (1968-05-01), Schainholz et al.
patent: 3535026 (1970-10-01), Coss
patent: 3737217 (1973-06-01), Haines et al.
patent: 3891311 (1975-06-01), Fletcher et al.
patent: 3936163 (1976-02-01), Toth
patent: 4027954 (1977-06-01), Good
patent: 4368959 (1983-01-01), D'Amato
Genco Louis V.
Task Harry L.
Buczinski Stephen C.
Kundert Thomas L.
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
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