Device for detecting and/or measuring visual deficiencies

Details Device for detecting and/or measuring visual deficiencies Device for detecting and/or measuring visual deficiencies

1985-09-04

1987-12-22

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351237, 351243, A61B 302

Patent

active

047143304

ABSTRACT:
The present invention relates to a device for detecting and/or measuring visual deficiencies in which an image observable by a patient presents several series of test signs, each corresponding with one of the various levels of visual acuity, wherein each sign corresponding to a level of visual acuity is associated to a reference sign corresponding to a lower level of visual acuity and wherein frame 1 contains signs corresponding to a visual acuity of 1/10, another frame 2 to 2/10 and following frames correspond to visual acuities ranging by steps of 2/10 respectively from the value 4/10 to the value 10/10.

REFERENCES:
patent: 3011394 (1961-12-01), Sherman et al.
patent: 4550990 (1985-11-01), Trispel et al.
American Optical Vision, American Optical Co., p. 14 "A-O Project-O-Chart"Jul. 1934.
Optometric Weekly, American Optical Co., p. 50, Aug. 1967.

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