Intra-ocular device with multiple focusing powers/optics
AssigneeNovartis AG
InventorsXiaoxiao Zhang, Richard J. Mackool, Xin Hong, Michael A. Southard
Life of this patent
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Abstract
An intraocular lens device that includes an intraocular lens optics that provides at least two powers of magnification one being near vision power and the other being distance vision power. The lens optics has surface modulations that are responsible for providing the near vision power. The zone structure provides an add power of over 6 diopters. The add power indicative of an extent that the near vision focusing power is greater than the distance vision focusing power.
Claims9
An intraocular lens comprising, an optic that provides at least two powers of magnification, one being near vision power and another being distance vision power, the optic having a plurality of surface modulations configured to achieve add power indicative of an extent that the near vision focusing power is greater than the distance vision focusing power of the optic, the surface modifications providing the add power to be greater than 6 diopters and having a plurality of zones radially spaced from each other.
An intraocular lens comprising, an optic that provides at least two powers of magnification, one being near vision power and another being distance vision power, the optic having a plurality of surface modulations within a diffractive zone structure that are configured to achieve light interference for creating add power indicative of an extent that the near vision focusing power is greater than the distance vision focusing power of the optic, the diffractive zone structure providing the add power to be greater than 6 diopters and having a plurality of diffractive zones radially spaced from each other each with at least one of the plurality of surface modulations, the diffractive zone structure being defined as a function of the add power in accord with
- ri2=(2i+1)λf
- wherein
- ri denotes a radial distance of each of the diffractive zones,
- i denotes a zone number for which a central zone is denoted by i=0,
- λ denotes a design wavelength, and
- f denotes an add power.
Dependencies are inferred from the claim text.