Patent ID: 8876286
Filing Date: 2014-11-04
Classification: G02C

Abstract:
1. A set of multifocal contact lenses for improving vision of presbyopic subjects, comprising: (i) a dominant eye series of multifocal contact lenses and (ii) a non-dominant eye series of multifocal contact lenses, each of said multifocal contact lenses in each series comprising an optic zone having an optic zone center and an optic zone perimeter spaced radially away from the optic zone center and defining a boundary between the optic zone and a peripheral zone, said optic zone having an aspheric power profile extending from the optic zone center towards the optic zone perimeter and providing a near vision refractive power and a distance vision refractive power such that each of said multifocal contact lenses has an Add power, said Add power being the absolute difference in power between the near vision refractive power and the distance vision refractive power; wherein the dominant eye series comprises a plurality of dominant eye patient lens sets correlating to Add power requirements of presbyopic subjects, said plurality of patient lens sets including a first dominant eye patient lens set comprising multifocal contact lens groups comprising multifocal contact lenses providing unique distance vision refractive powers, and each group including at least one multifocal contact lens, and the aspheric power profile of each of said multifocal contact lenses of said first dominant eye patient lens set provides a single Add power selected from a value from about 0.75 diopters to 2.00 diopters over a radial distance of 2.5 mm from the optic zone center for each lens of the series, and the Add power provided by the aspheric power profile of individual multifocal contact lenses of said first dominant eye patient lens set varies by no more than ±0.25 diopters compared to the Add power provided by a relative aspheric power profile of the multifocal contact lenses of the first dominant eye patient lens set, said relative aspheric power profile being the average of power profiles of a plurality of multifocal contact lenses of the first dominant eye patient lens set and in which the distance vision refractive power at a radial distance of 2.5 mm is fixed at 0.00 diopters, wherein the non-dominant eye series comprises a plurality of non-dominant eye patient lens sets correlating to Add power requirements of presbyopic subjects, said plurality of patient lens sets including a first non-dominant eye patient lens set comprising multifocal contact lenses, each of said multifocal contact lenses of the first non-dominant eye patient lens set having an aspheric power profile that provides a single Add power selected from a value from about 0.75 diopters to 2.00 diopters over a radial distance of 2.5 mm from the optic zone center for each lens of the first non-dominant eye patient lens set, with the proviso that the distance vision refractive power provided by the aspheric power profile of the multifocal contact lenses of the first non-dominant eye patient lens set is offset by about +0.25 diopters to about +1.25 diopters relative to the distance power correction for a presbyopic subject.