Process for determining a pair of progressive ophthalmic lenses
US9411170B2 · kind B2 · utility
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14Claims
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Key dates
| Filing date | Jun 28, 2013 |
| Grant date | Aug 9, 2016 |
| Priority date | — |
| Expiry date | Sep 28, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/063
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The visual perception of a lens wearer is not only along the gaze direction, but also has a non-zero transverse extension, which is called perceptual span. Perceptual span is skewed to extend further in the reading direction, i.e., the line portion to be read next relative to the line portion that was just read. A technique is provided that determines a pair of progressive ophthalmic lenses that take such perceptual span into account.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.