Progressive addition lenses
US6709105B2 · kind B2 · utility
98Cited by
12References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2001 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Apr 10, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present provides progressive addition lens designs and lenses in which unwanted lens astigmatism is reduced as compared to conventional progressive addition lenses. The lenses of the invention containing at least one surface that is a composite of a progressive surface design and a regressive surface design.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.