Contact lens comprising a violet tint
US6183083A · kind A · utility
2Cited by
18References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Sep 8, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/104
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Adding a small quantity of a violet colorant to a contact lens material provides a clear contact lens that has no apparent undesirable yellow tint, such as caused by a UV-absorbing compound. Further, the violet colorant can also be used with a colored lens, in the absence of the handling tint, to mask any undesirable yellow tint, such as that produced by a UV-absorbing compound. The violet colorant will not unacceptably alter the modifying color of the colored lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.