Automatic refraction apparatus and method

Details Automatic refraction apparatus and method Automatic refraction apparatus and method

1973-12-28

1976-07-13

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 28, 351 29, 351 31, A61B 302

Patent

active

039690202

ABSTRACT:
Apparatus and method provide for automatically measuring the refractive error of the human eye and thus the prescription for lens or eye glasses for correcting this error. Test symbols are alternately presented at two different locations on a test screen under control of a programmed automatic data processing system. The symbols are viewed by a subject through a lens system whose power may be continuously varied also under control of the data processing system. The data processing system also varies the size of the symbols presented to compensate for the power of the lens system so that a given symbol will appear to the subject to be of constant size. In one illustrative embodiment of the present invention, the subject communicates with the data processing equipment via a subject response device to indicate his preference for one or the other of the symbols presented at the two locations. The data processing system interprets the responses to alter the presentation of symbols and elicit another response from the subject.

REFERENCES:
patent: 3172404 (1965-03-01), Copenhaver
patent: 3486813 (1969-12-01), Johnston
patent: 3602580 (1971-08-01), Samuels
patent: 3718386 (1973-02-01), Lynn et al.
patent: 3822932 (1974-07-01), Humphrey

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