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1. (WO2018100452) INTRAOCULAR LENSES HAVING ZONE-BY-ZONE STEP HEIGHT CONTROL
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CLAIMS

We Claim:

1 . An ophthalmic lens having at least one focal length, the ophthalmic 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 diffractive structure being for at least one of the anterior surface and the posterior surface, the at least one step height being individually determined for each zone of the plurality of zones, the at least one step height being folded by a phase, the phase being an integer multiple of two multiplied by π.

2. The ophthalmic lens of claim 1 wherein the at least one focal length includes a plurality of focal lengths such that the ophthalmic lens is a multifocal lens.

3. The ophthalmic lens of claim 2 wherein the each zone is individually optimized for a portion of the plurality of focal lengths,

4. The ophthalmic lens of claim 2 wherein the each zone is individually optimized for the plurality of focal lengths.

5. The multifocal ophthalmic lens of claim 1 wherein the at least one step height includes a plurality of step heights.

6. The ophthalmic lens of claim 1 wherein the at least one step height is not more than two multiplied by π.

7. The ophthalmic lens of claim 1 wherein the at least one diffractive structure is incorporated into the anterior surface.

8. The ophthalmic lens of claim 1 wherein the each zone is individually optimized for a plurality of target positions.

9. A multifocal ophthalmic device comprising:

an ophthalmic lens including 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 diffractive structure being for at least one of the anterior surface and the posterior surface, the at least one step height being individually determined for each zone of the plurality of zones, the at least one step height being folded by a phase, the phase being an integer multiple of two multiplied by π; and

a plurality of haptics coupled with the ophthalmic lens.

10. A method for fabricating an ophthalmic lens having at least one focal length, the method comprising:

designing at least one diffractive structure including a plurality of zones for incorporation into at least one of an anterior surface and a posterior surface, each of the plurality of zones including at least one echelette having at least one step height, the step of designing the at least one diffractive structure further including

individually optimizing each zone of the plurality of zones to provide at least one optimized step height having at least one optimized phase; and

folding the at least one optimized step height by a phase to provide the at least one step height if the optimized step phase exceeds two multiplied by π, the phase being an integer multiple of two muitipiied by π; and

fabricating the ophthalmic lens using the at least one step height for the at least one diffractive structure.

1 1 . The method of claim 12 wherein the at least one focal length is a plurality of focal lengths and wherein the step of individually optimizing each zone further includes individually optimizing each zone for at least a portion of the plurality of focal lengths.

12. The method of claim 12 wherein the at least one step height is not more than two multiplied by π.

13. The method of claim 12 wherein the at least one diffractive structure is incorporated into the anterior surface.

14. The method of claim 12 wherein the at least one diffractive structure is incorporated into the posterior surface.

15. The method of claim 12 wherein the step of individually optimizing each zone further includes individually optimizing each zone for a plurality of target positions.