Spectacle lens for half-eye spectacles
US4906090A · kind A · utility
26Cited by
2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1986 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spectacle lens for half-eye spectacles is described which in accordance with the present invention has at least one aspherical surface whose surface focal power increased progressively from the upper rim area of the spectacle lens towards the lens bottom. In a preferred version example, the spectacle lens has a prismatic power of zero in the upper rim area. In a further preferred version example, the power of the spectacle lens increases progressively from a value other than zero in the upper rim towards the lens bottom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.