Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1994-10-26
1997-04-22
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351160R, A61B 300, G02C 704
Patent
active
056233230
ABSTRACT:
A contact-type ophthalmic lens for use in diagnosis and laser surgery has a contact lens (14), an entry lens (16), and an intermediate lens (18). The lenses are aligned along their optical axes. The anterior surface of the contact lens has an aspheric surface with a high power. The intermediate lens is a meniscus lens with a concave posterior surface and a convex anterior surface. Both surfaces of the entry lens are convex and aspheric. This combination of lenses provides a very wide field of view, allowing regions of the eye anterior to the equator to be readily viewed in an aerial image focused in a plane (50) anterior to the lens system.
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Crossman Janet L.
Johnson Robert D.
Mainster Martin A.
Dang Hung X.
Ocular Instruments, Inc.
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