Methods of obtaining ophthalmic lenses providing the eye with reduced aberrations
View Patent ↗The present invention discloses methods of obtaining ophthalmic lens capable of reducing the aberrations of the eye comprising the steps of characterizing at least one corneal surface as a mathematical model, calculating the resulting aberrations of said corneal surface(s) by employing said mathematical model, selecting the optical power of the intraocular lens. From this information, an ophthalmic lens is modeled so a wavefront arriving from an optical system comprising said lens and corneal model obtains reduced aberrations in the eye. Also disclosed are ophthalmic lenses as obtained by the methods which are capable reducing aberrations of the eye.
1. An intraocular lens based on a process comprising the steps of: (i) measuring an aberration of the eye by measuring at least one surface of the cornea of an eye;
characterizing the at least one surface as a mathematical model; using the measurement to determine a corneal spherical aberration of the eye: (ii) modeling an intraocular lens having a spherical surface and an aspheric surface, the spherical surface having a radius, and the aspheric surface having a radius, a conic constant and at least one non-zero aspheric polynomial constant;
(iii) selecting a power of the intraocular lens, wherein the radius of the spherical surface and the radius of the aspheric surface determine the power of the intraocular lens; and (iv) selecting a spherical aberration of the intraocular lens to offset the spherical aberration of the cornea, wherein the conic constant and the at least one aspheric polynomial constant of the aspheric surface determine the spherical aberration of the intraocular lens.
2. The intraocular lens of claim 1 , wherein the sum of the spherical aberration of the cornea and the sum of the spherical aberration of the intraocular lens is sufficiently reduced.
3. The intraocular lens of claim 1 , wherein the sum of the spherical aberration of the cornea and the sum of the spherical aberration of the intraocular lens is closer to zero than the spherical aberration of the cornea alone.
4. The intraocular lens of claim 1 , wherein the aspheric surface is an anterior surface of the intraocular lens, and the spherical surface is a posterior surface of the intraocular lens.
5. The intraocular lens of claim 1 , wherein the aspheric surface is an anterior surface of the intraocular lens, and the spherical surface is a posterior surface of the intraocular lens.
6. The intraocular lens of claim 1 , wherein the spherical aberration of the intraocular lens is adjusted by changing the values of the conic constant and at least one aspheric polynomial constant of the aspheric surface, without changing the values of the radii of the spherical and aspheric surfaces.
7. The intraocular lens of claim 1 , wherein the cornea is an average cornea having a mean radius and a mean shape; and wherein the sum of the spherical aberration of the average cornea and the spherical aberration of the intraocular lens is roughly zero.
8. The intraocular lens of claim 1 , wherein the cornea is for a particular patient; and wherein the sum of the spherical aberration for the particular patient cornea and the spherical aberration of the intraocular lens is roughly zero.
9. The intraocular lens of claim 1 , wherein the cornea is for a particular patient; and wherein the spherical aberration of the intraocular lens is adjustable in discrete increments by selecting the intraocular lens from a predetermined kit of lenses, with each lens in the predetermined kit of lenses having the same power but having different amounts of spherical aberration.
10. The intraocular lens of claim 9 , wherein each lens in the predetermined kit of lenses has a spherical surface having the same radius, and has an aspherical surface having the same radius but having different conic constants and at least one different aspheric polynomial constant.
11. The intraocular lens of claim 1 , wherein the intraocular lens is biconvex.
12. The intraocular lens of claim 11 , wherein the radius of the spherical surface is essentially equal to the radius of the aspherical surface.