Pair of progressive ophthalmic lenses
US9891447B2 · kind B2 · utility
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4Claims
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Key dates
| Filing date | Feb 12, 2014 |
| Grant date | Feb 13, 2018 |
| Priority date | — |
| Expiry date | Sep 6, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/065
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A pair of progressive ophthalmic lenses (1, 2) meets special conditions for improving binocular vision of a wearer, while avoiding discomfort for peripheral vision. A first one of the conditions relates to height values of far vision fields, intermediate vision fields and/or proximate vision fields, for indicating that the fields are different enough in height between both lenses. A second one of the conditions sets a maximum value for the relative difference in mean refractive power gradient between both lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.