Non-progressive multifocal lens with large near/intermediate area
US8272734B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 2010 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Aug 10, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A non-progressive ophthalmic lens used in eye frames is provided with at least two distinct viewing areas. A very large lower area (lower relative to the face and eyes of the wearer) is provided with near to intermediate range vision correction prescription. A smaller, top portion of the lens is provided with distance range viewing correction prescription or zero power. In order to reduce image jump, the lenses are positioned such that the major axis of the base lens intersects and ends on the major axis of the supplementary lens, and both major axes lie in the same vertical plane. The two lens segments meet at a lined or blended intersection to minimize consumption of non-optically viewable space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.