Patent ID: 11944535
Assignee: ALCON INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. An intraocular lens (IOL) having at least one focal length, the intraocular lens comprising:
an anterior surface;
a posterior surface; and
at least one diffractive structure including a plurality of zones, each of the plurality of zones including at least one echelette having at least one step height, the at least one step height being individually determined and optimized for each zone of the plurality of zones;
wherein a particular echelette in a particular one of the plurality of zones has an optimized step height that exceeds 2π and the diffractive structure includes a first echelette and a second echelette to represent the particular echelette, the first echelette having a step height of 2π and the second echelette having a step height of the difference between the optimized step height and 2π,
wherein the difference between the optimized step height and 2π is achieved by folding the optimized step height by a phase,
wherein, after folding the optimized step height by a phase, the step height of the second echelette is not more than two multiplied by π,
wherein the optimized step height and the folding by a phase compensates for chromatic aberration for a range of vision,
wherein the at least one focal length includes a plurality of focal lengths such that the intraocular lens is a multifocal IOL.