Apodized diffractive iol with frustrated diffractive region

Details Apodized diffractive iol with frustrated diffractive region Apodized diffractive iol with frustrated diffractive region

G - Physics

02

C

G02C 7/06 (2006.01) A61F 2/16 (2006.01) G02C 7/02 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2594442

In one aspect, the present invention provides a diffractive ophthalmic lens (e.g., a diffractive IOL) that includes an optic having an anterior surface and a posterior surface, where the optic provides a far focus. A frustrated diffractive structure comprising a plurality of diffractive zones is disposed on at least one of those surfaces so as to provide a near focus. Each zone is separated from an adjacent zone by a zone boundary that imparts an optical delay to the incident light. Further, at least two consecutive zone boundaries are configured such that a difference between their associated phase delays for at least one wavelength of the incident light is greater than about 1/4 wavelength so as to direct a portion of the incident light to a location between the near and far foci.

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