Extended Depth of Focus (EDOF) Lens to Increase Pseudo-Accommodation by Utilizing Pupil Dynamics

• US 20100016961A1
• Filed: 07/15/2009
• Published: 01/21/2010
• Est. Priority Date: 07/15/2008
• Status: Active Grant

• Current Assignee: Alcon Incorporated
• Original Assignee: Novartis Ag
• Inventors: Zhang, Yan, Simpson, Michael, Choi, Myoung, Zhang, Xiaoxiao, Karakelle, Mutlu, Hong, Xin
• Granted Patent: US 8,241,354 B2
• Time in Patent Office: Days
• US Class Current: 623/6.270
• 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: G02C 7/042 Simultaneous type
• CPC Class Codes: G02C 7/044 Annular configuration, e.g. pupil tuned

Abstract

In one aspect, the present invention provides an ophthalmic lens (e.g., an IOL) that includes an optic having an anterior surface and a posterior surface disposed about an optical axis. At least one of the surfaces (e.g., the anterior surface) has a profile characterized by superposition of a base profile and an auxiliary profile. The auxiliary profile can include an inner region, an outer region and a transition region between the inner and the outer regions, where an optical path difference across the transition region (i.e., the optical path difference between the inner and the outer radial boundaries of the transition region) corresponds to a non-integer fraction (e.g., ½) of a design wavelength (e.g., a wavelength of about 550 nm).

Claims

1. An ophthalmic lens, comprising

an optic having an anterior surface and a posterior surface disposed about an optical axis,

at least one of said surfaces having a profile characterized by superposition of a base profile and an auxiliary profile, said auxiliary profile comprising at least a first region, at least a second region and a transition region therebetween,

wherein an optical path difference across said transition region corresponds to a non-integer fraction of a design wavelength.

2. The ophthalmic lens of claim 1, wherein said transition region extends from an outer radial boundary of an inner region to an inner radial boundary of an outer region.

3. The ophthalmic lens of claim 2, wherein said transition region is adapted to provide a monotonic change in optical path difference relative to said outer boundary of the inner region as a function of increasing radial distance from the optical axis.

4. The ophthalmic lens of claim 3, wherein said monotonic change is characterized by a linear change.

5. The ophthalmic lens of claim 3, wherein said monotonic change is characterized by a succession of linear changes separated by one or more plateaus.

6. The ophthalmic lens of claim 1, wherein the profile (Z_sag) of the surface having said auxiliary profile is defined by the following relation:

Z_sag=Z_base+Z_aux,

wherein,

Z_sag denotes a sag of the surface relative to the optical axis as a function of radial distance from that axis, and wherein,

7. The ophthalmic lens of claim 6, wherein said base curvature c is in a range of about 0.0152 mm⁻

1 to about 0.0659 mm<sup>−

1</sup>.

8. The ophthalmic lens of claim 6, wherein said conic constant k is in a range of about −

1162 to about −

19 and said parameter a₂ is in a range of about −

0.00032 mm<sup>−

1</sup> to about 0.0 mm<sup>−

1</sup>, and said parameter a₄ is in a range of about 0.0 mm to about −

0.000053 mm<sup>−

3</sup>, and said parameter a₆ is in a range of about 0.0 mm<sup>−

5</sup> to about 0.000153 mm<sup>−

5</sup>.

9. The ophthalmic lens of claim 1, wherein the profile (Z_sag) of the surface having said auxiliary profile is defined by the following relation:

Z_sag=Z_base+Z_aux,

wherein,

Z_sag denotes a sag of the surface relative to the optical axis as a function of radial distance from said axis, and wherein,

10. The ophthalmic lens of claim 1, wherein said ophthalmic lens comprises an IOL.

11. An ophthalmic lens, comprising

an optic having an anterior surface and a posterior surface disposed about an optical axis,

at least one of said surfaces comprising

at least one inner refractive region,

at least one outer refractive region, and

a refractive transition region disposed between said inner and outer regions, said transition region extending from an inner radial boundary to an outer radial boundary thereof,

wherein said transition region is adapted such that a phase of radiation incident thereon varies monotonically from said inner to said outer boundary so as to generate a phase shift between said outer and inner boundaries characterized by a non-integer fraction of a design wavelength.

12. The ophthalmic lens of claim 11, wherein said non-integer fraction is less than one.

13. The ophthalmic lens of claim 11, wherein said non-integer fraction is greater than one.

14. The ophthalmic lens of claim 11, wherein said transition region comprises an annular region.

15. The ophthalmic lens of claim 11, wherein said at least one surface has a radial diameter in a range of about 1 mm to about 5 mm.

16. The ophthalmic lens of claim 14, wherein said annular region has a radial width in a range of about 0 mm to about 1 mm.

17. The ophthalmic lens of claim 11, wherein said design wavelength is about 550 nm.

18. The ophthalmic lens of claim 11, wherein said optic exhibits a through-focus modulation transfer function that is asymmetric relative to a focal plane of said optic for aperture sizes in a range of about 1.5 mm to about 6 mm.

19. The ophthalmic lens of claim 11, wherein each of said anterior and posterior surfaces exhibits a base profile adapted to impart a nominal monofocal refractive optical power to said lens.

20. The ophthalmic lens of claim 11, wherein said refractive power is in a range of about −

15 to about +50 Diopters.

21. An ophthalmic lens, comprising

an optic having an anterior surface and a posterior surface disposed about an optical axis, each of said surfaces having a base surface profile,

a pattern of surface variations superimposed on the base surface profile of at least one of said surfaces so as to generate a transition surface region extending between an inner and an outer surface regions,

wherein said transition region causes the optic to exhibit an asymmetric through-focus modulation transfer function for light incident on said optic through an aperture having a diameter in a range of about 1.5 mm to about 6 mm for a design wavelength.

22. The ophthalmic lens of claim 21, wherein said optic exhibits a depth of field in a range of about 0.25 Diopters to about 1.75 Diopters for light incident thereon through an aperture having a diameter in a range of about 1.5 mm to about 6 mm for said design wavelength.

23. The ophthalmic lens of claim 21, wherein said optic exhibits a substantially symmetric through-focus modulation transfer function of light at the design wavelength incident on said optic through an aperture having a diameter less than about 2 mm

24. An ophthalmic lens, comprising

an optic having an anterior surface and a posterior surface, each surface having a base profile such that said profiles cooperatively impart a nominal optical power to said optic,

at least one of said surfaces having a profile defined by addition of an auxiliary surface profile to its nominal surface profile, said auxiliary profile being characterized by a central region, an outer region and a transition region extending between said inner and outer regions,

wherein said auxiliary profile is adapted to cause a shift between an effective optical power and said nominal optical power of the optic for light having a design wavelength and incident on the optic through an aperture having a size in a selected range.

25. The ophthalmic lens of claim 24, wherein said effective optical power is characterized by a peak of a through-focus modulation transfer function of the optic at said design wavelength and said aperture size.

26. The ophthalmic lens of claim 25, wherein said auxiliary profile is adapted to enhance a depth of field of said optic for said design wavelength and said aperture size.

27. The ophthalmic lens of claim 26, wherein said depth-of-field is characterized as a full width at 15% contrast level in said through-focus modulation transfer function.

28. The ophthalmic lens of claim 27, wherein said shift in the effective optical power of the optic relative to its nominal optical power is in a range of about 0.25 D to about 1.75 D.

29. An ophthalmic lens, comprising

an optic having an anterior surface and a posterior surface disposed about an optical axis,

at least one of said surfaces comprising

at least an inner refractive region and at least an outer refractive region,

wherein a profile of said at least one surface is configured to impart a monotonically changing phase shift to incident radiation from an outer boundary of the inner region to an inner boundary of the outer region to provide a phase shift between the two boundaries that is a non-integer fraction of a design wavelength.

30. The ophthalmic lens of claim 29, wherein said design wavelength is about 550 nm.

31. The ophthalmic lens of claim 29, wherein a radial derivative of the profile of said at least one surface at said outer boundary of the inner region exhibits a discontinuity.

32. The ophthalmic lens of claim 29, wherein the profile of said at least one surface is configured such that said phase shift occurs over a radial distance in a range of about 0.75 mm to about 2.5 mm.

33. The ophthalmic lens of claim 29, wherein the profile of said at least one surface is configured such that said phase shift effects an extension of a depth-of-focus exhibited by said optic by a value in a range of about 0.25 D to about 1.75 D.