The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1976
Filed:
Oct. 04, 1974
Oleg Pomerantzeff, Brookline, MA (US);
Retina Foundation, Boston, MA (US);
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.