Multi-focal diffractive ophthalmic lens using suppressed diffraction orders
By suppressing one diffraction order in a multifocal diffractive lens and adjusting the light energy distribution to generate four consecutive focal points, the problem of uneven light energy distribution in existing lenses is solved, resulting in a wider visual range and clearer focusing.
CN117055242BActive Publication Date: 2026-07-07ALCON INC
Patent Information
- Application Number
- CN202311076087.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2014-12-18
- Filing Date
- 2015-01-30
- Publication Date
- 2026-07-07
- Estimated Expiration
- 2035-01-30
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Figure CN117055242B_ABST
Abstract
A multi-focal ophthalmic lens using suppressed diffraction orders. A multi-focal 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 diffraction orders corresponding to a range of vision between near vision and distance vision. The constructive interference produces a near focus point, a distance focus point, and an intermediate focus point between the near focus point and the distance focus point corresponding to the base power of the ophthalmic lens. The diffraction efficiency of at least one of the diffraction orders is suppressed to less than 10%.
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Citation Information
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