Patent ID: 7896916

Claim:
A diffractive multifocal intraocular lens comprising: a first surface and a second surface, said second surface opposes said first surface, said first surface having a first shape and said second surface having a second shape; where said first surface includes a diffractive pattern imposed on said first shape; wherein said intraocular lens provides a base focus and an additional focus, the base focus associated with a far viewing distance and far aberration characteristics, the additional focus comprising the base focus adjusted with a diffractive power of the diffractive pattern, the additional focus associated with a near viewing distance and near aberration characteristics; the near aberration characteristics of the intraocular lens and the far aberration characteristics of the intraocular lens each comprising a negative spherical aberration defined by at least one of said first shape and said second shape such that when the intraocular lens is in the context of an eye, the eye having a cornea with near aberrations associated with the near viewing distance and far aberrations associated with the far viewing distance, the far aberrations being different than the near aberrations, the intraocular lens mitigates: a far positive spherical aberration of a wavefront induced by transmitting visible light at 50 cycles/mm from the far viewing distance and through the cornea, when the wavefront is passing through said intraocular lens, so as to provide a far modulation transfer function (MTF), and a near positive spherical aberration of a near wavefront induced by transmitting visible light at 50 cycles/mm from the near viewing distance and through the cornea, when the near wavefront is passing through said intraocular lens, so as to provide a near MTF, a sum of the far MTF and the near MTF being above 0.5.