Progressive addition lenses
US6183084A · kind A · utility
53Cited by
17References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Jul 30, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to ophthalmic lenses. In particular, the invention provides ophthalmic lenses with reduced astigmatism. The lenses are composed of a surface and a compensating surface, the surface geometries of which are defined by segments of a size suitable to be defined by a tenth order x,y polynomial with Zernike coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.