Ophthalmoscope comprising defocused light source

Details Ophthalmoscope comprising defocused light source Ophthalmoscope comprising defocused light source

1998-11-24

2000-05-23

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

060658371

ABSTRACT:
The invention is an ophthalmoscope having an imaging path and imaging axis which includes a light source disposed in the imaging path at or in proximity with the imaging axis. Disposing the light source directly in the imaging path at or in proximity with the imaging axis provides numerous illumination and other operational advantages. When the light source is of sufficiently small size and is disposed in a sufficiently defocused position in relation to any retinal focal plane of the ophthalmoscope, the light source, for practical purposes, cannot be perceived by a user.

REFERENCES:
patent: 4422736 (1983-12-01), Nunokawa
patent: 4439024 (1984-03-01), Ito
patent: 5255025 (1993-10-01), Volk
patent: 5713047 (1998-01-01), Kohayakawa
patent: 5722762 (1998-03-01), Soll
patent: 5751395 (1998-05-01), Thall
patent: 5880813 (1999-03-01), Thall

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