Diagnostic indirect ophthalmoscopy contact lens system
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United States of America Patent
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-
Apr 6, 1993
Issued Date -
N/A
app pub date -
Oct 29, 1990
filing date -
Oct 27, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diagnostic indirect ophthalmoscopy lens device utilized for illumination and observation of the fundus of the eye may include a plus powered aspheric contact element and at least one anterior lens element which may also have aspheric surfaces and/or positive refractive power. The lens elements in combination act to illuminate and form an inverted aerial image of the fundus of the eye. A erecting optical system may be provided to reinvert the image produced by the lenses of the device, which facilitates examining or surgical procedures. The device may be a hand held device to enable easy manipulation, or may be a non-hand held device which maintains its position on the eye to be examined. The device may further include a separate source of illuminating light which allows proper illumination of the eye while avoiding reflections or the like.
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