Surface-treated contact lens and method of producing
US4666249A · kind A · utility
60Cited by
15References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1985 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Aug 14, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/043
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.