Eyeground inspecting contact lens

Details Eyeground inspecting contact lens Eyeground inspecting contact lens

1976-03-12

1978-01-10

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 16, A61B 310

Patent

active

040676463

ABSTRACT:
An eyeground inspecting contact lens adapted to be disposed in contact with the cornea of an eye to be inspected, in order that an illuminating light may be directed to the fundus of the eye so as effectively to illuminate the same for the observation of the eyeground, comprises a plurality of glass bodies having the incidence surface thereof inclined with respect to the optical axis. The refractive indices of the glass bodies, the inclined angle of the incidence surface with respect to the optical axis and the inclined angle of the boundary surface of each of the glass bodies with respect to the optical axis are selected such that, of the illuminating light flux, the light beam coincident with the optical axis prior to incidence on the first glass body is made parallel to but spaced from the optical axis after being passed through the glass bodies, and then impinges on the eyeground.

REFERENCES:
patent: 3820879 (1974-06-01), Frisen
"Allen Moncoscope Prism," Bausch & Lomb, Sept. 1947.

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