Method for optimizing the postural prism of an ophthalmic lens
US9274351B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 2014 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Feb 28, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Methods for optimizing postural prism to be added to a pair of ophthalmic multifocal lenses (lenses) adapted to a wearer and to slow down myopia progression are described. The method includes an initial pair of lenses in a providing step S1. In a postural prism adding step S2, a same postural prism is added to each lens. In a gazing step S3, the wearer gazes at a first distance target through the lenses with the added postural prism. A gazing direction determining step S4 determines the wearer's gazing direction during S3. Steps S2 to S4 may be repeated while changing the added postural prism, wherein the added postural prism is smaller than or equal to a maximum prism value. Steps S2 to S4 may be repeated to determine the smallest added postural prism for which the wearer's gazing direction in step S4 passes through the first vision zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.