G - Physics – 02 – C
Patent
G - Physics
02
C
G02C 7/04 (2006.01) A61F 2/16 (2006.01)
Patent
CA 2761725
An ophthalmic lens includes an optic having an anterior surface and a posterior surface. The lens also includes a monofocal diffractive structure disposed on one of said surfaces for providing a diffractive focusing power. The lens further includes at least one multifocal diffractive structure disposed on one of said surfaces for providing a plurality of diffractive focusing powers. The multifocal diffractive structure is adapted to provide chromatic aberration compensation for near vision.
La présente invention concerne une lentille ophtalmique qui comprend une optique possédant une surface antérieure et une surface postérieure. La lentille comprend également une structure à diffraction monofocale disposée sur l'une desdites surfaces pour fournir une puissance de focalisation à diffraction. La lentille comprend en outre au moins une structure à diffraction à foyer progressif disposée sur l'une desdites surfaces pour fournir une pluralité de puissances de focalisation à diffraction. La structure à diffraction à foyer multiple est conçue pour permettre une compensation de l'aberration chromatique pour la vision de près.
Hong Xin
Zhang Xiaoxiao
Kirby Eades Gale Baker
Novartis Ag
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