Ophthalmic lens
US7207675B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2006 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Jun 14, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Progressive multifocal ophthalmic lens having a power addition prescription and presenting a complex surface having a fitting cross and a principal meridian of progression. The lens has, when being worn, a normalized reduced root mean square deviation of less than 0.025 microns per diopter over a zone that includes the far vision control point and covering a sector whose apex lies 4° below the fitting cross with an angular aperture of between 150° and 160°; and a progression length of 25° or less, the progression length being defined as the angle of lowered of the view direction from the fitting cross down to the point on the meridian for which the wearer's optical power reaches 85% of the addition prescription.The lens is suitable for increased far vision with good accessibility to near vision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.