Shaow H Lin

US Patent:

46662499, May 19, 1987

Filed:

Aug 14, 1985

Appl. No.:

6/765891

Inventors:

Robert E. Bauman - Glendale AZ
S. Kumar Chandrasekaran - Paradise Valley AZ
Shaow B. Lin - Phoenix AZ
Lyle M. Bowman - Scottsdale AZ
Thomas B. Harvey - Scottsdale AZ

Assignee:

Sola U.S.A. Inc. - Phoenix AZ

International Classification:

B29D 1100

US Classification:

351160H

Abstract:

A contact lens for correction of astigmatism is formed from a single polymeric or copolymeric material. The lens has a central optical zone of greater rigidity than a surrounding non-optical zone. The rigidity of the central optical zone is sufficient for it to retain an astigmatism-correcting shape when worn on an eye, while the surrounding non-optical zone conforms to the shape of the eye.

US Patent:

46878165, Aug 18, 1987

Filed:

Aug 14, 1985

Appl. No.:

6/765886

Inventors:

Shaow B. Lin - Phoenix AZ
Lyle M. Bowman - Scottsdale AZ
S. Kumar Chandrasekaran - Paradise Valley AZ
Thomas B. Harvey - Scottsdale AZ

Assignee:

Sola U.S.A. Inc. - Phoenix AZ

International Classification:

C08F 832

US Classification:

525279

Abstract:

A process for the treatment of a soft contact lens, to increase its resistance to the deposition thereon and diffusion and accumulation therein of substances which will promote its clouding and discoloration in use, and to improve its mechanical strength, includes treating a hydroxyl group-containing acrylic ester soft contact lens or replica with an organic acid anhydride for a sufficient period of time to treat at least a portion of polymer molecules on the outer surfaces, e. g. by esterifying hydroxyl groups on the molecules and facilitating extraction of organic-type impurities. The process is optionally performed in the presence of a medium which partially swells the surface regions of the lens or replica prior to or during the process.