Intraocular lens with extended depth of focus
View Patent ↗An ophthalmic lens is disclosed, one embodiment comprising an optic having an anterior surface and a posterior surface disposed about an optical axis, wherein at least one of the surfaces has a profile characterized by superposition of a base profile and an auxiliary profile, the auxiliary profile comprising a continuous pattern of surface deviations from the base profile. The auxiliary profile is a sinusoidal profile and can be amplitude modulated, frequency modulated or both amplitude and frequency modulated. The ophthalmic lens can be an IOL.
1. An ophthalmic lens, comprising:
an optic having an anterior surface and a posterior surface disposed about an optical axis, wherein:
at least one of the surfaces has a profile characterized by superposition of a base profile and an auxiliary profile, the auxiliary profile comprising a continuous pattern of surface deviations from the base profile, wherein the auxiliary profile is a sinusoidal profile, and wherein the sinusoidal profile is amplitude and frequency modulated with a cosine function operable to shift light to a selected focal plane, wherein the amplitude and frequency modulated profile of the surface having said auxiliary profile is defined by the following relation:
y
=
a
cos
(
π
r
2
r
0
)
cos
(
2
π
r
2
bf
(
r
)
)
wherein,
y denotes the continuous pattern of surface deviations from the base profile;
a denotes the amplitude of the sinusoidal curve and the diffraction efficiency at different foci;
b denotes the periodicity and add power;
r denotes a radial distance from an optical axis of the lens;
r 0 is the termination pupil radius of the cosine modulation; and
f(r) is the square root of the pupil radius.
2. The ophthalmic lens of claim 1 , wherein the anterior surface and the posterior surface are convex.
3. The ophthalmic lens of claim 1 , where in the anterior surface and the posterior surface are concave.
4. The ophthalmic lens of claim 1 , wherein the base profile is spherical.
5. The ophthalmic lens of claim 1 , wherein the base profile is symmetric about an optical axis of the ophthalmic lens.
6. The ophthalmic lens of claim 1 , wherein the base profile is aspherical.
7. The ophthalmic lens of claim 1 , wherein the auxiliary profile is symmetric about an optical axis of the ophthalmic lens.
8. The ophthalmic lens of claim 1 , wherein the ophthalmic lens comprises an IOL.
9. The ophthalmic lens of claim 8 , wherein the IOL is a monofocal IOL.
10. The ophthalmic lens of claim 8 , wherein the IOL is an accommodative IOL.
11. The ophthalmic lens of claim 8 , wherein the IOL is a multifocal IOL.
12. The ophthalmic lens of claim 1 , wherein the anterior surface and the posterior surface are refractive surfaces.
13. An ophthalmic lens, comprising:
an optic having an anterior surface and a posterior surface disposed about an optical axis, wherein:
at least one of the surfaces has a profile characterized by superposition of a base profile and an auxiliary sinusoidal profile, the auxiliary sinusoidal profile comprising a continuous pattern of surface deviations from the base profile, wherein the auxiliary sinusoidal profile is modulated with a cosine function as defined by at least one of the following equations:
y
=
a
cos
(
π
r
2
r
0
)
cos
(
2
π
r
2
b
)
;
and
y
=
a
cos
(
π
r
2
r
0
)
cos
(
2
π
r
2
bf
(
r
)
)
;
wherein,
y denotes the continuous pattern of surface deviations from the base profile;
a denotes the amplitude of the sinusoidal curve and the diffraction efficiency at different foci;
b denotes the periodicity and add power;
r denotes the radial distance from the optical axis of the lens;
r 0 denotes the termination pupil radius of the cosine modulation; and
f(r) denotes the square root of r.
14. The ophthalmic lens of claim 13 , wherein the anterior surface and the posterior surface are convex.
15. The ophthalmic lens of claim 13 , where in the anterior surface and the posterior surface are concave.
16. The ophthalmic lens of claim 13 , wherein the base profile is spherical.
17. The ophthalmic lens of claim 13 , wherein the base profile is symmetric about an optical axis of the ophthalmic lens.
18. The ophthalmic lens of claim 13 , wherein the base profile is aspherical.
19. The ophthalmic lens of claim 13 , wherein the auxiliary profile is symmetric about an optical axis of the ophthalmic lens.
20. The ophthalmic lens of claim 13 , wherein the ophthalmic lens comprises an IOL.
21. The ophthalmic lens of claim 20 , wherein the IOL is a monofocal IOL.
22. The ophthalmic lens of claim 20 , wherein the IOL is an accommodative IOL.
23. The ophthalmic lens of claim 20 , wherein the IOL is a multifocal IOL.
24. The ophthalmic lens of claim 13 , wherein the anterior surface and the posterior surface are refractive surfaces.