Accommodative IOL with Dynamic Spherical Aberration

• US 20090204211A1
• Filed: 02/04/2009
• Published: 08/13/2009
• Est. Priority Date: 02/07/2008
• Status: Active Grant

• Current Assignee: Alcon Incorporated
• Original Assignee: Novartis Ag
• Inventors: Zhang, Xiaoxiao, Karakelle, Mutlu, Hong, Xin, Angelopoulos, Robert
• Granted Patent: US 7,998,198 B2
• Time in Patent Office: Days
• US Class Current: 623/6.370
• CPC Class Codes: A61F 2/1613 having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
• CPC Class Codes: A61F 2/1629 for changing longitudinal position, i.e. along the visual axis when implanted
• CPC Class Codes: A61F 2/1637 Correcting aberrations caused by inhomogeneities; correcting intrinsic aberrations, e.g. of the cornea, of the surface of the natural lens, aspheric, cylindrical, toric lenses
• CPC Class Codes: A61F 2/1648 Multipart lenses

Abstract

The present invention is generally directed to accommodative intraocular lenses (IOLs) that exhibit a dynamic spherical aberration as a function of accommodative power. By way of example, in one aspect, the present invention provides an intraocular lens (IOL) having an anterior optical element, a posterior optical element, and a mechanism for coupling the anterior and posterior elements so as to allow axial movement of those elements relative to one another for providing accommodation when the lens is implanted in a patient'"'"'s eye. Each of the anterior and the posterior elements includes at least one aspherical surface, where the asphericities of the surfaces are adapted to provide a combined spherical aberration that varies with accommodation.

Claims

1. An intraocular lens (IOL), comprising

an anterior optical element having at least one aspherical surface, and

a posterior optical element having at least one aspherical surface,

a mechanism for coupling said anterior and posterior optical elements so as to allow axial movement of said elements relative to one another for providing accommodation when the lens is implanted in a subject'"'"'s eye,

wherein said aspherical surfaces of the anterior and posterior elements are adapted to provide a combined spherical aberration that varies with accommodation.

2. The IOL of claim 1, wherein said spherical aberration changes from a positive value to a negative value as accommodation varies from distance vision to near vision.

3. The IOL of claim 1, wherein said IOL exhibits a negative spherical aberration for distance vision with the aberration decreasing as a function of increasing accommodation.

4. The IOL of claim 2, when said spherical aberration varies over a range from about +0.20 μ

m to about −

0.50 μ

m as a function of said variation in accommodation.

5. The IOL of claim 2, wherein said spherical aberration has a value in a range of about −

0.2 μ

m to about +0.2 μ

m when said optical elements are separated by a distance corresponding to an accommodation state suitable for distance vision.

6. The IOL of claim 2, wherein said spherical aberration has a value in a range of about −

0.02 μ

m to about −

0.50 μ

m when said optical elements are separated by a distance corresponding to an accommodation state suitable for near vision.

7. The IOL of claim 1, wherein the aspherical surface of at least one of said elements exhibits an asphericity characterized by a conic constant in a range of about −

2 to about −

60.

8. The IOL of claim 1, wherein said mechanism can adjust a separation between said elements over a range of about 0 mm to about 2 mm as the accommodation varies from distance vision to near vision.

9. The IOL of claim 1, wherein said aspherical surface of the anterior optical element corresponds to any of an anterior or a posterior surface of said anterior optical element.

10. The IOL of claim 1, wherein said aspherical surface of the posterior optical element corresponds to any of an anterior or a posterior surface of said posterior optical element.

11. The IOL of claim 1, wherein said anterior optical element provides an optical power in range of about 6 to about 40 Diopters.

12. The IOL of claim 1, wherein said posterior optical element provides an optical power in a range of about 6 to about 40 Diopters.

13. The IOL of claim 1, wherein said anterior and posterior optical elements are formed of a biocompatible material.

14. The IOL of claim 1, wherein at least one said optics has a toric surface.

26. The IOL of claim 1, wherein said spherical aberration exhibits a change characterized by a negative slope as a function of increased accommodation.

15. An intraocular lens (IOL) assembly, comprising

an anterior lens,

a posterior lens,

a coupling mechanism connecting said lenses so as to allow their axial movement relative to one another in response to natural accommodative forces of the eye when the IOL assembly is implanted in a subject'"'"'s eye,

said lenses providing a combined spherical aberration that varies as a function of accommodation state of the eye.

16. The IOL assembly of claim 15, wherein said combined spherical aberration changes from a positive value to a negative value as the accommodation state varies from one suitable for distance vision to one suitable for near vision.

17. A method of correcting vision, comprising

providing an accommodative intraocular lens (IOL) exhibiting a variable spherical aberration adapted to vary as a function of accommodation state of an eye in which the lens is implanted, and

implanting said accommodative IOL in a patient'"'"'s eye.

18. An accommodative intraocular lens (IOL), comprising

a dual-element optic comprising an anterior optical element and a posterior optical element,

wherein each of said elements provides a spherical aberration such that a combined spherical aberration of said elements varies as a function of an accommodation state of an eye in which the optic is implanted.

19. The accommodative IOL of claim 18, wherein said combined spherical aberration varies over a range extending from about +0.20 μ

m to about +0.50 μ

m as the accommodation state of the eye varies from one suitable for distance vision to one suitable for near vision.

20. An intraocular lens (IOL), comprising

an anterior optical element having at least one aspherical surface, and

a posterior optical element having at least one aspherical surface,

wherein said aspherical surfaces are adapted to provide a combined spherical aberration that varies as a function of pupil size when the lens is implanted in a patient'"'"'s eye.

21. The IOL of claim 20, wherein said combined spherical aberration is negative for pupil sizes less than about 6 mm.

22. The IOL of claim 20, wherein said combined spherical aberration is positive for pupil sizes greater than about 1 mm.

23. The IOL of claim 20, wherein said anterior optical element provides a monofocal optical power in a range of about 20 to about 50 Diopters.

24. The IOL of claim 20, wherein said posterior optical element provides a monofocal optical power in a range of about −

50 to about −

1 Diopters.

25. An accommodative IOL, comprising

an anterior optic having at least one aspherical surface,

a posterior optic having at least one aspherical surface,

a mechanism coupling said anterior optic to said posterior optic so as to cause an axial movement of said elements relative to one another in response to natural accommodative forces of an eye in which the IOL is implanted,

a diffractive structure disposed on at least a surface of one of said optics,

wherein said aspherical surfaces are adapted such that said IOL exhibits a decreasing spherical aberration as a function of increasing axial separation between said elements.

27. An intraocular lens (IOL), comprising

an anterior optical element,

a posterior optical element,

a mechanism for coupling said anterior and posterior elements and adapted to change a relative position of said elements in response to natural accommodative forces of an eye in which the IOL is implanted for providing accommodation,

wherein at least one of said elements includes a cylindrical surface configured to provide a residual cylindrical aberration that varies as a function of accommodation.