Ophthalmic filter materials
US6811727B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Aug 16, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2211/1433
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a photochromic plastic ophthalmic lenses having polymer matrices with an effective amount of at least one photochromic agent distributed therein, applied thereto or associated therewith and at least one ophthalmic filtering dye applied thereto, associated therewith or distributed therein the lens. A group of the filter lenses have dominant wavelengthes between 570 and 605 nm and color purity between 50% and 75%. Another lens product of the present invention is particularly suitable for patients suffering from retinitis pigmentosa. The lenses of the present invention are particularly suitable for individuals bothered by strong or variable illumination intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.