Indirect ophthalmoscopy device with reinverting lens system with

Details Indirect ophthalmoscopy device with reinverting lens system with Indirect ophthalmoscopy device with reinverting lens system with

1996-10-11

1998-04-28

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, A61B 300

Patent

active

057452121

ABSTRACT:
An indirect ophthalmoscopy lens device includes a plurality of lenses for collecting light emanating from a patient's eye and focussing the light to form a first, real, inverted image of the fundus of the patient's eye outside of the eye, and for reinverting the first, real, inverted image to form an erect image anterior of the device. The first, real, inverted image, rather than being an aerial image, may be formed at least partially within one of the plurality of lenses of the device. A conjugate pupil image, rather than being located in air as an aerial image of the patient's pupil, may be formed within one of the plurality of lenses of the device.

REFERENCES:
patent: 4721378 (1988-01-01), Volk
patent: 5200773 (1993-04-01), Volk
patent: 5523810 (1996-06-01), Volk

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