Multifocal corneal contact lenses

Details Multifocal corneal contact lenses Multifocal corneal contact lenses

1996-09-04

1998-09-22

Font, Frank G.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351161, G02C 704

Patent

active

058122354

ABSTRACT:
A pair of multifocal contact lenses for a patient comprises a first corneal contact lens having a concave posterior surface and a convex anterior surface. The anterior surface is formed with a power curve including a circular intermediate vision correction zone and an annular distance vision correction zone contiguous with the intermediate vision correction zone. The distance vision correction zone is concentric or coaxial with the intermediate vision correction zone. A second corneal contact lens of the pair also a concave posterior surface and a convex anterior surface. The anterior surface of the second lens is formed with a power curve including a circular intermediate vision correction zone and an annular near vision correction zone contiguous with the respective intermediate vision correction zone. The near vision correction zone is concentric or coaxial with the intermediate vision correction zone of the second lens. The intermediate vision correction zone of the first lens and the distance vision correction zone have optical powers differing in magnitude by less than approximately 1.5 diopters. Similarly, the intermediate vision correction zone of the second lens and the near vision correction zone have optical powers differing in magnitude by less than approximately 1.5 diopters.

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