Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-08-27
1998-09-08
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 300
Patent
active
058052690
ABSTRACT:
An indirect ophthalmoscopy lens device is provided for use with a slit-lamp or other biomicroscope for examination, laser treatment or surgical treatment of a patient's eye. The device comprises an image forming lens system for collecting and focussing light exiting a patient's eye to form a real image of the fundus of the patient's eye at a location outside the eye and anterior of the image forming lens system. An anterior lens having a convex anterior surface is disposed anterior to the image forming lens system so that the real image formed by the image forming lens system is located posterior of the convex anterior surface. The convex anterior surface of the anterior lens refracts chief rays of light ray bundles of the light exiting the patient's eye generally toward a collecting lens of the slit-lamp or other biomicroscope. An image viewed through the slit-lamp or other biomicroscope comprises a virtual image that has a positive magnification relative to the real image formed by the image forming lens system and relative to the fundus of the patient's eye.
REFERENCES:
patent: 5255025 (1993-10-01), Volk
patent: 5523810 (1996-06-01), Volk
patent: 5526074 (1996-06-01), Volk
Dang Hung X.
Volk Optical Inc.
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