Lens element with improved prismatic power
US8425034B2 · kind B2 · utility
12Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2011 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Jun 12, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/028
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens element for progressive spectacles. The lens element has at least one near viewing zone and a distance viewing zone which have different focusing powers. Further, the lens element has a predetermined prismatic power. Furthermore, a vertical component of the predetermined prismatic power is realized at a first point of the lens element, and a horizontal component of the predetermined prismatic power is realized at a second point of the lens element. The present invention also relates to a method for producing a lens element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.