Progressive power lens
US5446508A · kind A · utility
37Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1994 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Feb 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/068
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present includes a progressively variable focal power ophthalmic lens that has a unique geometry which significantly reduces aberrations in the lens. The aberrations are reduced by altering the traditional geometry associated with peripheral areas of the lens from a spherical shape to an aspherical shape. Still another advantage of the lens geometry of the present invention is that the aberrations remain low after the lens is rotated to accommodate the left or right eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.