Method of producing annealed polyvinyl alcohol contact lens
US4619793A · kind A · utility
746Cited by
7References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1984 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Jul 26, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/937
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Optically clear soft contact lenses of aqueous swollen solid polyvinyl alcohol having a weight average molecular weight of at least 6,000, having been annealed under crystallinity promoting conditions to effectively increase the elastic modulus of the swollen lenses, and optionally subsequently crosslinked, and methods of preparation and the use thereof are disclosed. The lenses are characterized by their relatively high oxygen transmissibility, sufficient to meet the needs of the human cornea, high optical clarity, improved hot water resistance and superior mechanical properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.