Indirect ophthalmoscopy lens providing apparent image curvature
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United States of America Patent
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-
Jul 25, 1995
Grant Date -
N/A
app pub date -
Apr 20, 1994
filing date -
Apr 20, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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