Four zone multifocal lenses
US7377638B2 · kind B2 · utility
26Cited by
16References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 2003 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | May 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides multifocal lenses containing at least four zones of different refractive power. The zones are positioned such that the wearer is able to use the inferior-most portion of the lens to more clearly, as compared to conventional multifocal lenses, view objects at distances more than 45 cm from the eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.