Wide-angle ophthalmoscope and fundus camera

Details Wide-angle ophthalmoscope and fundus camera Wide-angle ophthalmoscope and fundus camera

1974-10-04

1976-03-16

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

350 96B, 350179, 350220, 351 6, 351 16, 354 62, A61B 314

Patent

active

039443418

ABSTRACT:
A wide-angle indirect ophthalmoscope contains a contact lens that fits over a cornea and is surrounded by two rings of optical fibers for illumination of the eye fundus. The two rings of fibers are oriented to maximize illumination of the fundus while reducing troublesome reflections. The inside ring is formed of fibers with a numerical aperture and inclination selected to illuminate 100.degree. of the retina. The outside ring of fibers illuminates the periphery of the retina up to 150.degree.. The location and inclination of the rings are calculated to prevent blockage of the entrance pupil of the observation system while avoiding direct illumination of the entrance pupil.
A lens series for use in an ophthalmoscope in combination with the contact lens is also disclosed.
Further, a fundus camera contains the contact lens, the two rings of optical fibers, and a lens series for use in conjunction with a camera having a 50 mm focal length.

REFERENCES:
patent: 3770342 (1973-11-01), Dudragne

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