Multifocal ophthalmic eyeglass
US8157376B2 · kind B2 · utility
1Cited by
1References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 5, 2009 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Jan 2, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multifocal ophthalmic eyeglass (1) corrects a wearer's vision for a first vision distance in a principal vision zone (10) of the eyeglass, and for at least two different second vision distances in a secondary vision zone (20) of said eyeglass. For this purpose, the secondary vision zone is divided into at least two series of alternating regions, each producing an ophthalmic correction suitable for one of the second vision distances. A presbyopic wearer provided with such an eyeglass can both read a book and view an obstacle on the ground equally well, for the same direction of his gaze through the secondary vision zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.