Multifocal contact lens and method and apparatus for making the

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82 11, 451 42, B23B 300

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active

057407070

ABSTRACT:
A monocentric, multivision contact lens having a single optical axis and an anterior side. A first spherical vision surface is disposed on a first portion of the anterior side and has a first radius of curvature and a first center of curvature disposed along the single optical axis. A second spherical vision surface is disposed on a second portion of the anterior side and has a second radius of curvature and a second center of curvature disposed along the single optical axis. A transition surface is disposed intermediate the first portion and the second portion and has a plurality of centers of curvature disposed along the single optical axis. A method of making a monocentric contact lens and a mandrel for mounting a lens on a lathe for producing a monocentric contact lens are disclosed.

REFERENCES:
patent: 4693572 (1987-09-01), Tsuetaki et al.
patent: 4884482 (1989-12-01), Council, Jr.
patent: 5371976 (1994-12-01), Svochak

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