Method for determination of an ophthalmic lens
US7210780B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2006 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Jun 14, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/028
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The subject of the invention is a method for determination by optimization of an ophthalmic lens for a wearer for whom a power addition has been prescribed. The method proposes using as a target for the optimization of the lens, under wearing conditions, a difference of the mean orientation of the axes of resulting astigmatism to the vertical of less than 2.5° in a first control zone delimited by an ellipse centred on the progression meridian at half height between the fitting cross and the near vision reference point, said ellipse having a major axis greater than 35° and a minor axis comprised between 3.8° and 4.5°.The invention allows improvement in the performances of the progressive multifocal lenses in intermediate vision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.