Multifocal artificial ocular lens with a transparency varying with illumination
US6224210A · kind A · utility
21Cited by
12References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1999 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Dec 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/046
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multifocal artificial ocular lens has at least two corrective areas, namely a near vision area to correct near vision and a distance vision area to correct distance vision. The transparency of the lens varies in inverse proportion to its illumination. A photochromic substance is incorporated into the material of the lens, which improves optical performance. Applications include central near vision contact lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.