Indirect ophthalmoscopy lens providing apparent image curvature

Details Indirect ophthalmoscopy lens providing apparent image curvature Indirect ophthalmoscopy lens providing apparent image curvature

1994-04-20

1995-07-25

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 359432, A61B 300

Patent

active

054366801

ABSTRACT:
An ophthalmoscopy lens system is provided for collecting light rays emanating from a patient's eye and focussing the collected light rays to produce a real, aerial image of the fundus of the patient's eye. The ophthalmoscopy lens system includes a plurality of lens surfaces at least one of which is shaped to provide in conjunction with the other lens surfaces variable image distortion such that the aerial image, as viewed by an observer from a position anterior of the ophthalmoscopy lens system, has an apparent three dimensional concave curvature that imparts to the observer a sense of the actual concave curvature of the fundus being imaged.

REFERENCES:
patent: 4728183 (1988-03-01), Heacock et al.
patent: 4738521 (1988-04-01), Volk
patent: 5007729 (1991-04-01), Erickson et al.
patent: 5046836 (1991-09-01), Volk
patent: 5189450 (1993-02-01), Crossman et al.
patent: 5309187 (1994-05-01), Crossman et al.

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