Progressive addition lenses with an additional zone
US6886938B1 · kind B1 · utility
74Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 29, 2003 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Oct 29, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/066
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides multifocal lenses containing at least four zones of refractive power. The zones are positioned such that the wearer is able to use the inferior-most portion of the lens to clearly view objects at distances more than about 45 cm from the eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.