Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-08-29
1998-05-26
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 300
Patent
active
057574642
ABSTRACT:
An indirect, contact ophthalmoscopy lens device for use with a slit lamp or other biomicroscope comprises a compound contact lens element and an image forming lens system. The compound contact lens element includes a posterior lens portion having a concave posterior surface with a curvature corresponding to a curvature of an average cornea and anterior lens portion having a convex anterior surface. A middle lens portion is disposed between the posterior and anterior lens portions and has an index of refraction that is different from the index of refraction of air and is different from the index of refraction of each of the posterior and anterior lens portions. The middle lens portion includes a posterior surface that conforms with intimate contact to the anterior surface of the posterior lens portion and an anterior surface that conforms with intimate contact to the posterior surface of the anterior lens portion. In one embodiment the image forming lens system is disposed anterior of the compound contact lens element for capturing light exiting a patient's eye and refracted by the compound contact lens element for forming a real image of the patient's fundus outside the patient's eye. In another embodiment, a compound lens constituting a complete imaging system includes a posterior lens portion that contacts the eye, an anterior lens portion that comprises the image forming lens and a middle lens portion that conforms with intimate contact to the posterior and anterior lens portions.
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patent: 5430506 (1995-07-01), Volk
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patent: 5479222 (1995-12-01), Volk
patent: 5523810 (1996-06-01), Volk
patent: 5526189 (1996-06-01), Heacock et al.
Mai Huy
Volk Optical Inc.
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