Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1975-02-10
1977-06-07
Sacher, Paul A.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
351 36, 351 37, A61B 302
Patent
active
040279545
ABSTRACT:
A device for testing eyes provided with a rotatable drum located within a light impermeable casing in which the drum carries a plurality of slides bearing characters positioned on the perimeter of the drum and illuminated by a lamp located within the drum, and in which the characters may be viewed by the person whose eyes are being tested through an optical system. The optical system has a direct path to a near testing station on the drum for near vision testing, and a longer indirect path to a far vision testing station on the drum utilizing a mirror positioned perpendicularly to the far vision testing station to increase the path length. The eye testing apparatus has an aperture in a sidewall of the casing located between the drum and the reflector adjacent to the far testing station to permit the operator to directly view the slide at the far test station in which an optical system is provided for the operator which includes a convex lens at the aperture and a mirror mounted between the drum and the reflector adjacent to the opposite sidewall of the casing in order to improve the visibility and illumination of the characters on the slide as seen by the operator.
REFERENCES:
patent: 2364793 (1944-12-01), Jobe et al.
patent: 3012472 (1961-12-01), Feinberg
patent: 3519338 (1970-07-01), Papritz
Sacher Paul A.
School Health Supply Company
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