Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1990-10-29
1993-04-06
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351160R, A61B 300
Patent
active
052007731
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.
REFERENCES:
patent: 4410245 (1983-10-01), Koester
patent: 4728183 (1988-03-01), Heacock et al.
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