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1. WO2020201550 - SYSTEMS AND METHODS FOR VERGENCE MATCHING WITH AN OPTICAL PROFILE AND USING REFRACTIVE INDEX WRITING

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[ EN ]

CLAIMS

What is claimed is:

1. A system for improving vision of a subject, comprising:

a pulsed laser system configured to apply a plurality of laser pulses to an intraocular lens (IOL) implanted in an eye of a subject and to change the refractive index of at least one selected area of the IOL by refractive index writing, wherein the IOL has an optical profile induced by refractive index writing;

a control system coupled to the pulsed laser system and configured to control the pulsed laser system to apply the plurality of laser pulses according to calculated pattern, and wherein the control system is further configured to perform functions that comprise:

determining the direction of a plurality of rays associated with a vergence of a wavefront;

determining the ray direction and ray height of a plurality of rays entering a first location of the optical profile;

determining the refractive index of the optical profile at the first location;

based on the determined ray direction, ray height, and refractive index at the first location, and by refractive index writing using the pulsed laser system, specifying the volume and shape of each voxel to match the wavefront through the direction of propagation.

2. The system of claim 1, wherein the control system is further configured to calculate the pattern of laser pulses to apply.

3. The system of claim 1 or 2, wherein anterior and posterior surfaces of the optical profile are bent such that rays inside a portion of the IOL changed by refractive index writing and outside a portion of the IOL changed by refractive index writing do not change direction.

4. The system of any one of claims 1-3, wherein the control system is further configured to determine a second location that, for each of the rays, corresponds to the location where the respective ray exits the optical profile changed by refractive index writing.

5. The system of any one of clams 1-4, wherein the volume and shape of each voxel match the wavefront through the direction of propagation such that the voxels decrease for converging wavefronts.

6. The system of any one of claims 1-4, wherein the volume and shape of each voxel match the wavefront through the direction of propagation such that the voxels increase for diverging wavefronts.

7. The system of any one of claims 1-6, wherein the anterior and posterior surfaces of the optical profile are bent such that rays at the interface of the respective surfaces of the optical profile with other portions of the lens have a zero incidence.

8. The system of any one of claims 4-7, wherein the first location corresponds to a first plane parallel to a vertical axis of the lens and the second location corresponds to a second plane parallel to the first plane.

9. The system of any one of claims 4-7, wherein the first location is proximate to or corresponds to the anterior surface of the lens and wherein the second location is proximate to or corresponds to the posterior surface of the lens.

10. The system of claim 1, wherein the bent anterior and posterior surfaces are bent to define a non- zero curvature about the optical axis.

11. A method of vergence matching for an intraocular lens (IOL) having an optical profile induced by refractive index writing, the method comprising:

determining the direction of a plurality of rays associated with a vergence of a wavefront; determining the ray direction and ray height of a plurality of rays entering a first location of the optical profile;

determining the refractive index of the optical profile at the first location;

based on the determined ray direction, ray height, and refractive index at the first location, and by refractive index writing, specifying the volume and shape of each voxel to match the wavefront through the direction of propagation;

bending anterior and posterior surfaces of the optical profile such that rays inside a portion of the IOL changed by refractive index writing and outside a portion of the IOL changed by refractive index writing do not change direction; and

determining a second location that, for each of the rays, corresponds to the location where the respective ray exits the optical profile changed by refractive index writing.

12. The method of claim 11, wherein the volume and shape of each voxel match the wavefront through the direction of propagation such that the voxels decrease for converging wavefronts.

13. The method of claim 11, wherein the volume and shape of each voxel match the wavefront through the direction of propagation such that the voxels increase for diverging wavefronts.

14. The method of claim 11, wherein the anterior and posterior surfaces of the optical profile are bent such that rays at the interface of the respective surfaces of the optical profile with other portions of the lens have a zero incidence.

15. The method of claim 11, wherein the first location corresponds to a first plane parallel to a vertical axis of the lens and the second location corresponds to a second plane parallel to the first plane.

16. The method of claim 11, wherein the first location is proximate to or corresponds to the anterior surface of the lens and wherein the second location is proximate to or corresponds to the posterior surface of the lens.

17. The method of claim 11, wherein the bent anterior and posterior surfaces are bent to define a non- zero curvature about the optical axis.

18. The method of any one of claims 11-17, wherein the refractive index writing comprises applying a plurality of pulses of radiation according to a predetermined pattern.

19. The method of claim 18, wherein the plurality of pulses of radiation are focused laser pulses applied according to the predetermined pattern.

20. The method of any one of claims 11-19, wherein the IOL is implanted in an eye of a subject.