Limited echelette lens, systems and methods
Systems and methods for providing enhanced image quality across a wide and extended range of foci encompass vision treatment techniques and ophthalmic lenses such as contact lenses and intraocular lenses (IOLs). Exemplary IOL optics can include a circular surface structure with limited adjacent echelettes which act as a diffractive or phase shifting profile.
1. An ophthalmic lens comprising:
an anterior face and a posterior face, the faces disposed about an optical axis; and
at least one diffractive profile imposed on the anterior face or the posterior face, the at least one diffractive profile comprised of an inner echelette and between 1 and 4 peripheral echelettes, wherein at least 2 echelettes are not adjacent to each other and are separated by a refractive region; and wherein the inner echelette and the peripheral echelette(s) are not separated by a refractive region.
2. The ophthalmic lens of claim 1 , wherein the inner echelette has a diameter within a range from about 1 mm to about 5 mm.
3. The ophthalmic lens of claim 1 , wherein the lens further comprises a peripheral portion characterized by a spherical curve or an aspherical curve.
4. The ophthalmic lens of claim 1 , wherein the inner and peripheral echelettes are characterized by a surface area between 1 and 7 square millimeters.
5. The ophthalmic lens of claim 1 , wherein the echelettes further comprise of transitions characterized by a step height having a value within a range from about 0.5 μm and about 4 μm.
6. The ophthalmic lens of claim 5 , wherein the step heights provide a phase shift between about 0.25 and about 3 times the design wavelength.
7. The ophthalmic lens of claim 5 , wherein the step height for at least 2 echelettes differ.
8. The ophthalmic lens of claim 5 , wherein the surface area for at least 2 echelettes differ.
9. An ophthalmic lens comprising:
an anterior face and a posterior face, the faces disposed about an optical axis; and
at least one diffractive profile imposed on the anterior face or the posterior face, the at least one diffractive profile comprised of an inner echelette and between 1 and 4 peripheral echelettes, wherein at least 2 echelettes are not adjacent to each other and are separated by a refractive region; and wherein the inner and peripheral echelettes are characterized by a surface area between 1 and 7 square millimeters.
10. The ophthalmic lens of claim 9 , wherein the inner echelette has a diameter within a range from about 1 mm to about 5 mm.
11. The ophthalmic lens of claim 9 , wherein the lens further comprises a peripheral portion characterized by a spherical curve or an aspherical curve.
12. The ophthalmic lens of claim 9 , wherein the echelettes further comprise of transitions characterized by a step height having a value within a range from about 0.5 μm and about 4 μm.
13. The ophthalmic lens of claim 12 , wherein the step heights provide a phase shift between about 0.25 and about 3 times the design wavelength.
14. The ophthalmic lens of claim 12 , wherein the step height for at least 2 echelettes differ.
15. The ophthalmic lens of claim 12 , wherein the surface area for at least 2 echelettes differ.
16. An ophthalmic lens comprising:
an anterior face and a posterior face, the faces disposed about an optical axis; and
at least one diffractive profile imposed on the anterior face or the posterior face, the at least one diffractive profile comprised of an inner echelette and between 1 and 4 peripheral echelettes, wherein at least 2 echelettes are not adjacent to each other and are separated by a refractive region; and wherein the inner and peripheral echelettes have the same surface area.
17. The ophthalmic lens of claim 16 , wherein the inner and peripheral echelettes are characterized by a surface area between 1 and 7 square millimeters.
18. The ophthalmic lens of claim 16 , wherein the inner echelette and the peripheral echelette(s) are not separated by a refractive region.
19. The ophthalmic lens of claim 16 , wherein the inner echelette has a diameter within a range from about 1 mm to about 5 mm.
20. The ophthalmic lens of claim 16 , wherein the lens further comprises a peripheral portion characterized by a spherical curve or an aspherical curve.
21. The ophthalmic lens of claim 16 , wherein the echelettes further comprise of transitions characterized by a step height having a value within a range from about 0.5 μm and about 4 μm.
22. The ophthalmic lens of claim 21 , wherein the step heights provide a phase shift between about 0.25 and about 3 times the design wavelength.
23. The ophthalmic lens of claim 21 , wherein the step height for at least 2 echelettes differ.
24. The ophthalmic lens of claim 21 , wherein the surface area for at least 2 echelettes differ.