Method for determining a set of progressive multifocal ophthalmic lenses
US7997726B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2006 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Feb 12, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for determining by optimization a set of progressive ophthalmic lenses for a given user for whom a near vision power addition (Addn) has been prescribed includes the following steps: measuring the user's near vision individual physiological parameters; determining an ergorama associating, on each lens, a target point in each look direction in worn conditions; determining a target power defect and a resulting target astigmatism for each direction of look under worn conditions, the target power defect and the resulting target astigmatism being determined from the user's measured physiological parameters; computing the power required for each lens for said ergorama by successive iterations to reach the target power defect and the target astigmatism for each look direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.