Progressively varying focal power opthalmic lens
US4307945A · kind A · utility
87Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1980 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | Apr 4, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A progressively variable focal power ophthalmic lens. The lens has a unique geometry which allows the correction of distortion of horizontal and vertical lines to be retained below detectable levels in the temporal peripheral zone of the lens after the lens is rotated to accommodate the left or right eye. In addition, the geometry further allows the minimization of the astigmatic aberration in the area of the peripheral zone adjacent to the distance portion and the elimination of the astigmatic aberration in the lower part of the temporal peripheral zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.