Achromatic lenses and lenses having diffractive profiles with irregular width for vision treatment
Apparatuses, systems and methods for providing improved ophthalmic lenses, particularly intraocular lenses (IOLs), include features for providing improved extended depth of focus lenses. Exemplary ophthalmic lenses can include an optic including a diffractive profile including at least one set of echelettes, each echelette of the set having a different width in r-squared space than any other echelette of the set and the at least one set of echelettes repeating at least once upon the optic.
1. An ophthalmic lens comprising:
an optic including a first surface and a second surface each disposed about an optical axis and extending radially outward from the optical axis to an outer periphery of the optic, the first surface facing opposite the second surface, and
the optic including a plurality of echelettes disposed on the first surface between the optical axis and the outer periphery of the optic, each of the plurality of echelettes having a different width in r-squared space than any other echelette on the first surface between the optical axis and the outer periphery of the optic,
wherein the optic includes a central zone and a peripheral zone, and the plurality of echelettes are positioned on the central zone, and the peripheral zone includes a refractive surface,
wherein at least two of the echelettes of the plurality of echelettes have a different step height,
wherein the plurality of echelettes define at least one set of echelettes, and the at least one set of echelettes repeating at least once upon the central zone of the optic,
wherein the refractive surface is adjacent to the plurality of echelettes, and extends radially outward from the plurality of echelettes to the outer periphery of the optic,
wherein the plurality of echelettes provide an extended depth of focus.
2. The ophthalmic lens of claim 1 , wherein the plurality of echelettes includes at least three echelettes.
3. The ophthalmic lens of claim 1 , wherein the plurality of echelettes includes at least four echelettes.
4. The ophthalmic lens of claim 1 , wherein the plurality of echelettes includes at least five echelettes.
5. The ophthalmic lens of claim 1 , wherein at least one echelette of the plurality of echelettes is configured to distribute light to a near focus or to an intermediate focus.
6. The ophthalmic lens of claim 1 , wherein the plurality of echelettes modify chromatic aberration in a distance focus.
7. The ophthalmic lens of claim 1 , wherein the refractive surface provides one or more of an intermediate focus, a near focus, or an extended depth of focus.
8. The ophthalmic lens of claim 1 , wherein the optical axis of the optic passes through the central zone.
9. The ophthalmic lens of claim 1 , wherein at least one of the plurality of echelettes is configured to distribute light to a near focus.
10. The ophthalmic lens of claim 9 , wherein at least one of the plurality of echelettes is configured to distribute light to an intermediate focus.
11. The ophthalmic lens of claim 10 , wherein each echelette is configured to distribute light to a distance focus.
12. The ophthalmic lens of claim 1 , wherein each echelette of the plurality of echelettes is positioned adjacent to another echelette of the plurality of echelettes.