Toric multifocal contact lenses
US6923540B2 · kind B2 · utility
117Cited by
50References
50Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2003 |
| Grant date | Aug 2, 2005 |
| Priority date | — |
| Expiry date | Aug 3, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a toric multifocal contact lens having a cylindrical optical power to correct astigmatism vision errors and a multifocal power to compensate for presbyopia. A toric multifocal contact lens of the invention has a central axis, an anterior surface having a first central optical zone, and an opposite posterior surface having a second central optical zone. The first central optical zone and the second central optical zone combine to provide a cylindrical optical power to correct astigmatism vision errors and a multifocal power to compensate for presbyopia.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.