Assymetrical progressive lens
US7828433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2008 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Oct 22, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/066
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Progressive lens for viewing a field of vision having at least a first portion including objects in a first range of distances from a viewer and a second portion including objects in a second range of distances from the viewer, the lens comprising: at least two different power zones, the first power zone having lens power required by the viewer for the first range of distances of viewed objects from the viewer, and the second power zone having lens power required by the viewer for the second range of distances of viewed objects from the viewer, wherein the size and location on the lens of the first power zone correspond to size and location in the field of vision of the first portion, and wherein the size and location on the lens of the second power zone correspond to size and location in said field of vision of the second portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.