Diffractive lenses for range of vision
Apparatuses, systems and methods for providing improved ophthalmic lenses, particularly intraocular lenses (IOLs), include features for providing a range of vision. Chromatic aberrations may be reduced at near, distance, and intermediate vision.
1. An ophthalmic lens comprising:
an optic disposed about an optical axis and having an anterior surface and a posterior surface, and including a diffractive profile including a plurality of echelettes, wherein a first echelette of the plurality of echelettes includes an optical zone, wherein the optical zone includes a subshape having a gradual change in slope that includes a change in sign of the slope, and wherein a second echelette of the plurality of echelettes lacks a subshape having a gradual change in slope that includes a change in sign of the slope, and wherein the second echelette has a vertical transition zone, and wherein the first echelette has a curved transition zone between the first echelette and the second echelette.
2. The ophthalmic lens of claim 1 , wherein the subshape of the first echelette comprises a height variation with respect to a profile of the first echelette were the subshape not present on the first echelette.
3. The ophthalmic lens of claim 2 , wherein the height variation is less than 25% of an overall height of the first echelette, or less than 20% of an overall height of the first echelette, or less than 15% of an overall height of the first echelette, or less than 10% of an overall height of the first echelette, or less than 5% of an overall height of the first echelette.
4. The ophthalmic lens of claim 2 , wherein the optic includes a central zone and the diffractive profile is positioned on the central zone.
5. The ophthalmic lens of claim 4 , wherein the central zone has a first refractive shape, and the optic includes a peripheral zone having a second refractive shape with a greater curvature than the first refractive shape.
6. The ophthalmic lens of claim 5 , wherein the peripheral zone has a refractive profile.
7. The ophthalmic lens of claim 4 , wherein the central zone has a first refractive shape, and the optic includes a peripheral zone having a second refractive shape with a same curvature as the first refractive shape.
8. The ophthalmic lens of claim 7 , wherein the diffractive profile is a first diffractive profile and the optic includes a peripheral zone including a second diffractive profile having a plurality of parabolic echelettes having heights of between 0.9 and 1.1 wavelength.
9. The ophthalmic lens of claim 2 , wherein the diffractive profile is configured to provide distance vision at a second diffractive order.
10. The ophthalmic lens of claim 2 , wherein the diffractive profile is configured to provide distance vision at a first diffractive order.
11. The ophthalmic lens of claim 2 , wherein at least one of the plurality of echelettes is non-parabolic.
12. The ophthalmic lens of claim 2 , wherein the plurality of echelettes includes a set of at least two echelettes that repeats in r-squared space upon the optic.
13. The ophthalmic lens of claim 12 , wherein the set repeats in r-squared space at least two times upon the optic.
14. The ophthalmic lens of claim 13 , wherein the set repeats in r-squared space at least three times upon the optic.
15. The ophthalmic lens of claim 13 , wherein the set includes the first echelette and the second echelette.
16. The ophthalmic lens of claim 15 , wherein the set repeats in r-squared space at least three times upon the optic.
17. The ophthalmic lens of claim 12 , wherein each of the at least two echelettes of the set is non-parabolic.
18. The ophthalmic lens of claim 17 , wherein the set includes at least two echelettes and a portion of a third echelette, the set repeating in r-squared space upon the optic.
19. The ophthalmic lens of claim 18 , wherein the set includes a portion of a fourth echelette, the set repeating in r-squared space upon the optic.
20. The ophthalmic lens of claim 2 , wherein a height of a transition zone of at least one of the plurality of echelettes is 1 wavelength.
21. The ophthalmic lens of claim 2 , wherein a height of a transition zone of at least one of the plurality of echelettes is between 1 wavelength and 2 wavelengths.
22. The ophthalmic lens of claim 2 , wherein the slope of the subshape of the first echelette changes two times.
23. The ophthalmic lens of claim 22 , wherein a slope of the optical zone including the subshape is negative, and the slope of the subshape changes gradually to become positive and subsequently changes gradually to become negative.
24. The ophthalmic lens of claim 2 , wherein the subshape of the first echelette is positioned on a middle portion of the first echelette.
25. The ophthalmic lens of claim 2 , wherein the subshape of the first echelette has a height that is less than a height of the transition zone of the first echelette.
26. The ophthalmic lens of claim 25 , wherein the first echelette repeats in r-squared space upon the optic.
27. The ophthalmic lens of claim 26 , wherein the subshape of the first echelette repeats in r-squared space upon the optic.
28. The ophthalmic lens of claim 27 , wherein the plurality of echelettes includes a set of at least two echelettes and a portion of the subshape, the set repeating in r-squared space upon the optic.
29. The ophthalmic lens of claim 2 , wherein the diffractive profile includes a plurality of transition zones of the plurality of echelettes, at least one of a plurality of the transition zones being a vertical transition zone and at least one of a plurality of the transition zones being a curved transition zone.
30. The ophthalmic lens of claim 29 , wherein the curved transition zone repeats in r-squared space upon the optic.
31. The ophthalmic lens of claim 2 , wherein a height of a transition zone of each echelette of the plurality of echelettes is the same for all echelettes in r-squared space.
32. The ophthalmic lens of claim 2 , wherein the optic has a greater chromatic correction at an intermediate vision than at a distance vision.
33. The ophthalmic lens of claim 2 , wherein the optic has a greater chromatic correction at an intermediate vision than at a near vision.