Multifocal contact lens and method and apparatus for making the

Details Multifocal contact lens and method and apparatus for making the Multifocal contact lens and method and apparatus for making the

1996-10-21

1998-04-21

Howell, Daniel W.

Turning

Process of turning

82 11, 451 42, B23B 300

Patent

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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