Multifocal intraocular lens
View Patent ↗An intraocular lens for providing a subject with vision at various distances includes an optic having a first surface with a first shape, an opposing second surface with a second shape, a multifocal refractive profile, and one or more diffractive portions. The optic may include at least one multifocal diffractive profile. In some embodiments, multifocal diffractive and the multifocal refractive profiles are disposed on different, distinct, or non-overlapping portions or apertures of the optic. Alternatively, portions of the multifocal diffractive profiles and the multifocal refractive profiles may overlap within a common aperture or zone of the optic.
1. An ophthalmic lens, comprising:
an optic comprising a first surface having a first shape and an opposing second surface having a second shape, the shapes together providing a base optic power;
a multifocal refractive profile imposed on at least one of the shapes over a first radial extent, the multifocal refractive profile including a first radial portion and a second radial portion each having a refractive base power of about zero Diopters and a refractive add power wherein the refractive add power of the first radial portion is different than the refractive add power of the second radial portion;
a multifocal diffractive profile imposed on at least one of the shapes over a second radial extent which equals the first radial, the multifocal diffractive profile having, for visible light, a primary diffraction order, a secondary diffraction order, and a diffractive add power corresponding to a difference in optical power between the secondary diffraction order and the primary diffraction order;
an overlap portion defining an overlap aperture, the overlap aperture filled by the multifocal refractive profile and the multifocal diffractive profile;
the overlap portion having at least one combined add power provided by a combination of the refractive add power of the first radial portion and the diffractive add power;
a third radial portion having an average optical power of about zero Diopters;
wherein the third radial portion is an innermost radial portion; and
wherein the refractive add power of the first radial portion varies continually with radius; and
a fourth radial portion with a constant power of zero Diopters;
wherein the first radial portion is adjacent to and more radially distant than the third radial portion and the fourth radial portion is adjacent to and more radially distant than the first radial portion.
2. The ophthalmic lens of claim 1 , wherein the first and second radial extents begin at an optical axis.
3. The ophthalmic lens of claim 1 , wherein the primary diffraction order is a zeroth diffraction order having an optical power of about zero Diopters and the secondary diffraction order is a first diffraction order having an optical power that is between about 2 Diopter and about 8 Diopters.
4. The ophthalmic lens of claim 1 , wherein the primary diffraction order is a first diffraction order, the secondary diffraction order is a second diffraction order, and the diffractive add power being between about 2 Diopters and 8 Diopters.
5. The ophthalmic lens of claim 1 , wherein the overlap aperture has an outer boundary shape, wherein the outer boundary shape is an annular ring having an inner diameter and an outer diameter.
6. The ophthalmic lens of claim 1 , wherein the optic includes a clear aperture, wherein both the multifocal refractive profile and the multifocal diffractive profile fill the entire clear aperture.
7. The ophthalmic lens of claim 1 , wherein the optic has an intermediate add power within the overlap aperture that is less than the combined add power, the intermediate add power being the refractive add power of the first radial portion or the diffractive add power.
8. The ophthalmic lens of claim 1 , wherein the refractive add power of the first radial portion is about 2 Diopter, the diffractive add power is about 2 Diopter, and the combined add power is between about 3.5 Diopter and about 4.5 Diopters.
9. The ophthalmic lens of claim 1 , wherein the refractive add power of the first radial portion and the diffractive add power are both between about 1 Diopter and about 3 Diopters.
10. The ophthalmic lens of claim 1 , wherein the refractive add power of the first radial portion is configured to provide near vision or intermediate vision, the diffractive add power is configured to provide near vision or intermediate vision, or both the refractive add power of the first radial portion and the diffractive add power are each configured to provide near vision or intermediate vision.
11. The ophthalmic lens of claim 1 , further comprising an additional multifocal profile and an additional overlap portion defining an additional overlap aperture that includes the additional multifocal profile, the additional multifocal profile being a multifocal diffractive profile or a multifocal refractive profile.
12. The ophthalmic lens of claim 11 , wherein the additional overlap portion has at least one combined add power provided by the additional multifocal profile in combination with a multifocal profile.
13. The ophthalmic lens of claim 1 , wherein the refractive add power of the first radial portion is between about 1 Diopter and 3 Diopters.
14. The ophthalmic lens of claim 1 , wherein the refractive add power of the first radial portion is between about 1 Diopter and 4 Diopters.