Patent ID: 8882265

Claim:
A batch of multifocal contact lenses for improving vision of presbyopic subjects, comprising: a plurality of multifocal contact lenses, each of said multifocal contact lenses comprising an optic zone having a radius extending from an optic zone center to 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 the optic zone of 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; said plurality of multifocal contact lenses comprising a plurality of first multifocal contact lens groups, each first multifocal contact lens group comprising multifocal contact lenses providing a unique single distance vision refractive power for the first multifocal contact lens group, and the aspheric power profile of each of said multifocal contact lenses within a single contact lens group 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 contact lens group, and the Add power provided by the aspheric power profile of individual multifocal contact lenses of any of the first multifocal contact lens groups varies by no more than ±0.25 diopters compared to the Add power provided by a relative aspheric power profile of the plurality of multifocal contact lenses, said relative aspheric power profile being the average of power profiles of the plurality of multifocal contact lenses and in which the distance vision refractive power at a radial distance of 2.5 mm is fixed at 0.00 diopters, and the aspheric power profile of the individual multifocal contact lenses of any of the first multifocal contact lens groups differs by no more than ±0.375 diopters compared to the relative aspheric power profile of the plurality of multifocal contact lenses along the power profile for each radial distance measured along the power profile.