Pair of progressive ophthalmic lenses
US9759931B2 · kind B2 · utility
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2References
12Claims
0Family size
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Key dates
| Filing date | Feb 12, 2014 |
| Grant date | Sep 12, 2017 |
| Priority date | — |
| Expiry date | Feb 12, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/066
- 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 sets a minimum value for the difference between nasal and temporal half-widths of far vision field and/or proximate vision field for at least one of the lens. 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.