Methods and devices for refractive corrections of presbyopia
Methods for treating presbyopia in a patient's eye involve inducing spherical aberration in a central area of the pupil. In embodiments, refractive properties of an eye are measured to obtain a baseline refractive correction. A lens for wearing on the eye is provided to create spherical aberration or a distribution of spherical aberrations beyond the baseline refractive correction in the central area of the pupil. The central area of the pupil has a diameter of between 1.5 mm and 4.0 mm and has negligible spherical aberration without the treatment.
1 . A method for treating presbyopia of an eye, comprising:
obtaining a baseline refractive correction; and
providing a lens for wearing on the eye to create a spherical aberration or a distribution of spherical aberrations beyond the baseline refractive correction in an area of a pupil having a diameter of 1.5 mm to 3.6 mm that has negligible spherical aberration without the lens;
wherein the lens comprises:
i) an inner optical section of 1.5 mm to 3.6 mm in diameter corresponding to the area of the pupil, wherein the inner optical section comprises at least one aspheric surface, and the aspheric surface is configured to create the spherical aberration or the distribution of spherical aberrations in addition to a spherical focus power, wherein the lens is configured to have a circular shape with a radial distance expressed by r, and wherein the lens is further configured to have a thickness profile in the inner optical section that is expressed at least in part by r 4 to allow creation of the spherical aberration or the distribution of spherical aberrations;
ii) a middle optical section having an outer diameter of 2.5 mm to 5 mm, wherein the middle optical section is configured as a bi-focal lens; and
iii) an outer optical section having an outer diameter of 4 mm to 40 mm, wherein the outer optical section is configured to have the baseline refractive correction.
2 . The method of claim 1 , wherein the spherical aberration or the distribution of spherical aberrations allows production of a focus variation selected from the group consisting of (a) setting a far point at a center of the lens and having a radially increased refractive power, (b) having a radially decreased refractive power and setting a portion of the eye for hyperopia, and (c) having at least one zone with a radially increased refractive power and another zone with a radially decreased refractive power and setting a portion of the eye for hyperopia.
3 . The method of claim 1 , wherein the lens is configured such that the spherical aberration or the distribution of spherical aberrations allows production of a focus variation of more than 4 diopters.
4 . The method of claim 1 wherein the lens is further configured to allow production of a cylindrical refractive power.
5 . The method of claim 1 , wherein the bi-focal lens comprises alternating powers.
6 . A method for refractive treatment of presbyopia, comprising:
obtaining a baseline refractive correction; and
providing an optical device for wearing on an eye to induce a spherical aberration or a distribution of spherical aberrations beyond the baseline refractive correction in an area of a pupil that has negligible spherical aberration without the optical device;
wherein the optical device comprises i) an inner transparent optical section that comprises at least one aspheric surface that is configured to allow the induction of the spherical aberration or the distribution of spherical aberrations in addition to a spherical focus power, wherein the inner transparent optical section corresponds to the area of the pupil, wherein the optical device is configured to have a circular shape with a radial distance expressed by r, and wherein the optical device is further configured to have a thickness profile in the inner transparent optical section that is expressed at least in part by r 4 to allow creation of the spherical aberration or the distribution of spherical aberrations;
ii) a middle section that is configured to allow attenuation or blocking of light energy; and
iii) an outer transparent optical section that is configured to provide at least the spherical focus power for far vision at night.
7 . The method of claim 6 , wherein the optical device is configured such that the spherical aberration or the distribution of spherical aberrations allows production of a focus variation selected from the group consisting of (a) setting a far point at a center of the optical device and having a radially increased refractive power, (b) having a radially decreased refractive power and setting a portion of the eye for hyperopia, and (c) having at least one zone with a radially increased refractive power and another zone with a radially decreased refractive power and setting a portion of the eye for hyperopia.
8 . The method of claim 6 , wherein the optical device is configured such that the spherical aberration or the distribution of spherical aberrations allows production of a focus variation of more than 4 diopters.
9 . The method of claim 6 , wherein the inner transparent optical section has a diameter of between 1.5 mm and 3.6 mm.
10 . The method of claim 6 , wherein an outer diameter of the middle section is between 2.5 mm and 5 mm.
11 . The method of claim 6 , wherein an outer diameter of the outer transparent optical section is between 4 mm and 40 mm.
12 . The method of claim 6 , wherein the optical device is configured to produce a cylindrical refractive power.
13 . A method for treatment of presbyopia of an eye, comprising:
obtaining a baseline refractive correction; and
providing a lens for wearing on the eye to induce a spherical aberration or a distribution of spherical aberrations beyond the baseline refractive correction in an area of a pupil of a diameter of 1.5 mm to 4 mm that has negligible spherical aberration without the lens;
wherein the lens comprises:
i) an inner optical section having a diameter of 1.5 mm to 4 mm and comprising at least one aspheric surface that is configured to allow the induction of a) the spherical aberration, wherein the induced spherical aberration covers a zone in the diameter between 1.5 mm and 4 mm, or b) the distribution of spherical aberrations in the form of a positive spherical aberration in a first zone and a negative spherical aberration in a second zone, wherein the first zone and the second zone are concentric and have a largest outer diameter equal to or less than 4 mm; in addition to a spherical focus power in the area of the pupil, wherein the lens is configured to have a circular shape with a radial distance expressed by r, and wherein the lens is further configured to have a thickness profile in the inner optical section that is expressed at least in part by r 4 to allow creation of the spherical aberration or the distribution of spherical aberrations; and
ii) an outer transparent optical section having a diameter of 4 mm to 40 mm, wherein the outer transparent optical section is configured to have at least the spherical focus power for far vision at night or the baseline refractive correction.
14 . The method of claim 13 , wherein the lens is configured such that the spherical aberration or the distribution of spherical aberrations allows production of a focus variation for more than 4 diopters in a manner selected from the group consisting of (a) setting a far point at a center of the lens and having a radially increased refractive power, (b) having a radially decreased refractive power and setting a portion of the eye for hyperopia, and (c) having at least one zone with a radially increased refractive power and another zone with a radially decreased refractive power and setting a portion of the eye for hyperopia.