Short corridor progressive addition lenses with reduced unwanted astigmatism
US7229173B2 · kind B2 · utility
70Cited by
6References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 25, 2004 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Aug 25, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides lenses produced by the adding of two or more surfaces, in which lenses both the length of the corridor is shortened and the maximum unwanted astigmatism is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.