Ophthalmoscopic system with a wide angle objective lens

Details Ophthalmoscopic system with a wide angle objective lens Ophthalmoscopic system with a wide angle objective lens

1977-05-17

1979-12-04

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

350189, 351 16, 354 62, A61B 314

Patent

active

041769201

ABSTRACT:
The wide angle ophthalmoscopic system disclosed includes an objective lens group having a forward direction toward an eye to be examined and having at least one meniscus lens and a positive lens. The meniscus lens includes a front concave forward surface and constitutes substantially an aplanatic lens having an aplanatic point to be situated in the front part of an eye to be examined. A converging lens group in the system is positioned behind the objective lens group. An illuminating system has at least one light source and light transmitting arrangement for directing light in the forward direction. An observing optical system is optically aligned with the objective lens group for transmitting images formed by the objective lens group.

REFERENCES:
patent: 3594071 (1971-07-01), Okajima
patent: 3914032 (1975-10-01), Takano et al.

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