A method and system provide an ophthalmic device. The ophthalmic device includes an ophthalmic lens having an anterior surface, a posterior surface, at least one diffractive structure and at least one base curvature. The at least one diffractive structure for provides a first spherical aberration for a first focus corresponding to at least a first focal length. The at least one base curvature provides a second spherical aberration for at least a second focus corresponding to at least a second focal length. The first spherical aberration and the second spherical aberration are provided such that the first focus has a first focus spherical aberration and the second focus has a second focus spherical aberration. The first focus spherical aberration is opposite in sign to the second focus spherical aberration.

This document describes intraocular lenses and methods for their use. For example, this document describes intraocular lenses that are shaped with a concave posterior peripheral portion that mitigates occurrences of dysphotopsia. The intraocular lenses described herein are designed to reduce positive and negative dysphotopsias after cataract surgery.

Systems and methods are provided for improving overall vision in patients suffering from a loss of vision in a portion of the retina (e.g., loss of central vision) by providing a piggyback lens which in combination with the cornea and an existing lens in the patient's eye redirects and/or focuses light incident on the eye at oblique angles onto a peripheral retinal location. The piggyback lens can include a redirection element (e.g., a prism, a diffractive element, or an optical component with a decentered GRIN profile) configured to direct incident light along a deflected optical axis and to focus an image at a location on the peripheral retina. Optical properties of the piggyback lens can be configured to improve or reduce optical errors at the location on the peripheral retina. One or more surfaces of the piggyback lens can be a toric surface, a higher order aspheric surface, an aspheric Zernike surface or a Biconic Zernike surface to reduce optical errors in an image produced at a peripheral retinal location by light incident at oblique angles. One or more surfaces of the piggyback lens can be faceted.

This document describes intraocular lenses and methods for their use. For example, this document describes intraocular lenses that are shaped with a concave posterior peripheral portion that mitigates occurrences of dysphotopsia. The intraocular lenses described herein are designed to reduce positive and negative dysphotopsias after cataract surgery.

An intraocular lens system comprising a single lens comprising two optical surfaces selected to maintain image quality at the foveal centre whilst reducing image aberration at preferred retinal locus locations outside of the fovea region.

The invention relates to a multifocal lens 1 having several concentric diffractive zones 7, 8, 9, 10 on a lens surface 2, wherein in each diffractive zone a diffraction phase structure is defined, which is expressible by the following function or by a smoothed version of the function:

[00001]$\varphi \left(\xi \right)=2\pi \times \left\{\begin{array}{ll}{p}_1\xi ,\hfill & 0\le \xi <w_1\hfill \\ p_2\xi +q_2,\hfill & w_1\le \xi <w_2\hfill \\ p_3\xi +q_3,\hfill & w_2\le \xi <1\hfill \end{array}\right),$

wherein ξ indicates a position within the respective diffractive zone in a radial direction, Φ(ξ) indicates a phase shift experienced by light passing through the position indicated by ξ, w.sub.1 and w.sub.2 define a spatial partitioning of the respective diffractive zone in the radial direction, p.sub.1, p.sub.2 and p.sub.3 indicate gradients and q.sub.2 and q.sub.3 are constants. The position ξ depends quadratically on a radial distance to the center of the lens surface and is normalized with respect to the radial width of the respective diffractive zone and the gradients p.sub.1, p.sub.2 and p.sub.3 are negative.

The present invention relates to an aspherical multifocal intraocular lens with large depth of field, the intraocular lens having an anterior optical surface and a posterior optical surface, wherein one optical surface is distributed with an aspherical surface which plays a role of expanding the depth of field, and the other optical surface is distributed with a multifocal structure which plays a role of providing two or more focal points. The aspherical surface provides a depth of field matching with an absolute value of a difference in refractive power of at least one pair of adjacent focal points of the two or more focal points provided by the multifocal structure. The aspherical surface, on the one hand, allows a continuous visual range between the focal points and, on the other hand, extends near vision in the direction of near focal point through the depth of field, thereby enabling continuous, uninterrupted full-range vision and adequate near vision. The present invention also relates to a method for manufacturing an intraocular lens. The present invention also relates to an artificial lens, and more particularly to an artificial lens that makes use of excessive resolution to achieve focal extension. The present invention also relates to a method for manufacturing an artificial lens.

The embodiments disclosed herein include improved toric lenses and other ophthalmic apparatuses (including, for example, contact lens, intraocular lenses (IOLs), and the like) that includes a freeform-polynomial surface area that establishes a band of operational meridian for the apparatus to an intended correction meridian. The freeform-polynomial surface area is defined by a mathematical expression comprising a combination of one or more polynomial expressions (e.g., Chebyshev-based polynomial expression, Zernike-based polynomial expression, etc.) each having a distinct complex orders.

Method to design manufacture an intraocular lens, comprising an optical part and haptics part, in which the optical part comprises an anterior surface with negative refractive power and a posterior surface with positive refractive power, in which in order to determine the refractive power D of the anterior surface of the optical part and the refractive power D′ of the posterior surface of the optical part the following steps are performed: a plurality of light rays are provided over the normal eye, both on the optical axis (1001) and forming different angles (714, 715, 716) with respect to the optical axis (1001), for each light ray with its angle the axial length of the eye and the refractive power of the cornea are measured, determination of the shape of the retina (200) through a mathematical fit to an aspherical surface that contains the measured points, calculation of the arc length S that goes from the intersection of the optical axis with the retina (200) of the eye to the intersection of the light ray with the retina (200) of the eye for each angle, as a function of the shape of the retina (200) and the angle of the light ray, fit of the refractive power D of the anterior surface of the optical part and refractive power D′ of the posterior surface of the optical part using ray tracing optimization in a pseudophakic eye model.

An intraocular lens system comprising a single lens comprising two optical surfaces selected to maintain image quality at the foveal centre whilst reducing image aberration at preferred retinal locus locations outside of the fovea region.