Extended range and related intraocular lenses for presbyopia treatment
Apparatuses, systems and methods for providing improved ophthalmic lenses, particularly intraocular lenses (IOLs), include features for reducing dysphotopsia effects, such as haloes and glare, in extended range of vision lenses. Exemplary ophthalmic lenses can include a central zone with a first set of three echelettes arranged around the optical axis, the first set having a profile in r-squared space. An intermediate zone includes a second set of three echelettes arranged around the optical axis, the second set having a profile in r-squared space that is different than the profile of the first set. A peripheral zone includes a third set of three echelettes arranged around the optical axis, the third set having a profile in r-squared space that is different than the profile of the first set and the profile of the second set.
1. An ophthalmic lens, comprising:
a first surface and a second surface disposed about an optical axis; and
a diffractive profile imposed on one of the first surface or the second surface, the diffractive profile including a central zone, a peripheral zone, and an intermediate zone positioned between the central zone and the peripheral zone, wherein:
the central zone includes a first set of three diffractive echelettes arranged around the optical axis, the first set having a profile in r-squared space;
the intermediate zone includes a second set of three diffractive echelettes arranged around the optical axis, the second set having a profile in r-squared space that is different than the profile of the first set; and
the peripheral zone includes a third set of three diffractive echelettes arranged around the optical axis, the third set having a profile in r-squared space that is different than the profile of the first set and the profile of the second set, the third set being repeated in series on the peripheral zone.
2. The lens of claim 1 , wherein each of the three diffractive echelettes of the first set have a different profile than each other in r-squared space.
3. The lens of claim 2 , wherein each of the three diffractive echelettes of the second set have a different profile than each other in r-squared space.
4. The lens of claim 3 , wherein each of the three diffractive echelettes of the third set have a different profile than each other in r-squared space.
5. The lens of claim 1 , wherein the third set being repeated in series on the peripheral zone forms a repeated set that is configured to result in a light distribution with more than 40% of incident light distributed toward a first diffractive power, less than 10% of incident light distributed toward a second diffractive power, less than 10% of incident light distributed toward a third diffractive power, and more than 10% of incident light distributed toward a fourth diffractive power.
6. The lens of claim 5 , wherein the second diffractive power is between about 0.58 and 1.5 diopter, the third diffractive power is between about 1.17 and 3 diopter, and the fourth diffractive power is between about 1.75 and 4.5 diopter.
7. The lens of claim 1 , wherein the profile of the first set includes a zero step height between two of the three diffractive echelettes of the first set.
8. The lens of claim 7 , wherein the three diffractive echelettes of the first set include a first diffractive echelette, a second diffractive echelette, and a third diffractive echelette, with the third diffractive echelette being positioned radially outward from the first diffractive echelette, and the second diffractive echelette being positioned between the first diffractive echelette and the third diffractive echelette, and the zero step height being between the second diffractive echelette and the third diffractive echelette.
9. The lens of claim 1 , wherein the profile of the third set includes a zero step height between two of the three diffractive echelettes of the third set.
10. The lens of claim 9 , wherein the three diffractive echelettes of the third set include a first diffractive echelette, a second diffractive echelette, and a third diffractive echelette, with the third diffractive echelette being positioned radially outward from the first diffractive echelette, and the second diffractive echelette being positioned between the first echelette and the third diffractive echelette, and the zero step height being between the second diffractive echelette and the third diffractive echelette.
11. The lens of claim 1 , wherein the three diffractive echelettes of the first set include a first diffractive echelette, a second diffractive echelette, and a third diffractive echelette, and wherein the first diffractive echelette begins at the optical axis of the lens and extends radially outward from the optical axis.