Multifocal diffractive ophthalmic lens using suppressed diffractive order
US9335564B2 · kind B2 · utility
26Cited by
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9Claims
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Key dates
| Filing date | Dec 18, 2014 |
| Grant date | May 10, 2016 |
| Priority date | — |
| Expiry date | Jan 14, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multifocal ophthalmic lens includes an ophthalmic lens and a diffractive element. The ophthalmic lens has a base curvature corresponding to a base power. The diffractive element produces constructive interference in at least four consecutive diffractive orders corresponding a range of vision between near and distance vision. The constructive interference produces a near focus, a distance focus corresponding to the base power of the ophthalmic lens, and an intermediate focus between the near focus and the distance focus. A diffraction efficiency of at least one of the diffractive orders is suppressed to less than ten percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.