Multifocal ophthalmic lens

1. A method of designing a multifocal ophthalmic lens, comprising:

characterizing a corneal surface as a mathematical model;

calculating resulting monochromatic aberrations of the corneal surface by employing the mathematical model;

providing a lens with one base focus and at least one additional focus; and

modeling the lens by selecting an aspheric component for a surface of the lens such that a wavefront arriving from an optical system comprising the lens and the corneal surface obtains reduced monochromatic aberrations for at least one of the foci;

wherein the sum of a modulation for the two or more foci is more than 0.40, at a spatial frequency of 50 cycles per millimetre, when the measurements are performed in an average/individual eye model using a 5 mm aperture.

2. A method of designing an improved multifocal intraocular lens, comprising:

providing a multifocal lens having a diffractive pattern formed thereon;

providing an optical system comprising the multifocal lens and a corneal model;

calculating a wavefront monochromatic aberration resulting from an optical system; and

re-modeling a surface of the multifocal lens to have an aspheric component that is selected to reduce the wavefront monochromatic aberration;

wherein the diffractive pattern includes an apodization zone configured to gradually shift energy from a first focus of the multifocal lens to a second focus of the multifocal lens.

3. A method of designing a multifocal intraocular lens, comprising:

representing a cornea by a prolate surface, the cornea producing a monochromatic aberration to a wavefront in the eye;

providing a diffractive intraocular lens having a base focus and an additional focus; and

selecting a surface of the diffractive intraocular lens such that an optical system comprising the intraocular lens and the cornea provides reduction of the monochromatic aberration in a wavefront passing through the optical system for at least one of the foci;

wherein the diffractive intraocular lens comprises a diffractive surface and a refractive surface opposite the diffractive surface, the refractive surface having an aspheric component selected to obtained reduced aberrations for at least one of the foci.

4. The method of claim 3 , wherein the aspheric component is a prolate shape.

5. A method of designing a multifocal intraocular lens, comprising:

representing a cornea by a prolate surface, the cornea producing a monochromatic aberration to a wavefront in the eye;

providing a diffractive intraocular lens having a base focus and an additional focus; and

selecting a surface of the diffractive intraocular lens such that an optical system comprising the intraocular lens and the cornea provides reduction of the monochromatic aberration in a wavefront passing through the optical system for at least one of the foci;

wherein a light distribution between the base focus and the additional focus is between 70%:30% to 30%:70%.

6. A method of designing a multifocal intraocular lens, comprising:

representing a cornea by a prolate surface, the cornea producing a monochromatic aberration to a wavefront in the eye;

providing a diffractive intraocular lens having a base focus and an additional focus; and

selecting a surface of the diffractive intraocular lens such that an optical system comprising the intraocular lens and the cornea provides reduction of the monochromatic aberration in a wavefront passing through die optical system for at least one of the foci;

wherein a light distribution between the base focus and the additional focus is 50%:50%.