Method of increasing the concentration of radiation-absorbing agents in optical and ophthalmic lenses
US5480927A · kind A · utility
20Cited by
26References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1994 |
| Grant date | Jan 2, 1996 |
| Priority date | — |
| Expiry date | May 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/043
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and composition useful in fabricating radiation-absorbing contact lenses, especially ultraviolet (UV) and visible (tint) light-absorbing lenses. The radiation-absorber is incorporated into a contact lens in the presence of a buffer which maintains the pH near neutral. Subsequently, the radiation-absorber is chemically affixed to the lens by raising the pH to a highly basic level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.