Pupil dependent diffractive lens for near, intermediate, and far vision

Abstract

A multifocal diffractive lens comprises a multifocal diffractive structure coupled to a refractive component. The refractive component comprises at least one curved surface. The multifocal diffractive structure comprises a first plurality of substantially monofocal echellettes having a first optical power for near vision correction and a second plurality of substantially monofocal echellettes for far vision correction. The first plurality of substantially monofocal echellettes combined with the second plurality of substantially monofocal echellettes can provide a multifocal diffractive profile having decreased light scatter, chromatic aberration, and diffraction to non-viewing orders such that dysphotopsia is substantially inhibited. A third plurality of substantially monofocal echellettes having an intermediate optical power can be combined with the first plurality of substantially monofocal echellettes and the second plurality of substantially monofocal echellettes.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to multifocal ophthalmic lenses to correct vision of an eye, such as multifocal intraocular lenses, multifocal contact lenses, and multifocal spectacles.[0003]2. Description of Background Art[0004]Presbyopia is a condition that affects the accommodation properties of the eye. As objects move closer to a young, properly functioning eye, the effects of ciliary muscle contraction and zonular relaxation allow the lens of the eye to change shape, and thus increase its optical power and ability to focus at near distances. This accommodation can allow the eye to focus and refocus between near and far objects.[0005]Presbyopia normally develops as a person ages, and is associated with a natural progressive loss of accommodation. The presbyopic eye often loses the ability to rapidly and easily refocus on objects at varying distances. The effects of presbyopia usually become noticeable after the age o...

AI Technical Summary

Benefits of technology

[0013]Embodiments of the present invention provide decreased light scattering and decreased chromatic aberration with a lens comprising a multifocal diffractive structure coupled to a surface of a refractive component, for example imposed on the surface, so as to provide improved patient vision at near and far viewing distances. The lens may comprise a foldable IOL having the diffractive structure imposed on the refractive component on a first side of the IOL. The multifocal diffractive structure may comprise a first plurality of substantially monofocal diffractive echellettes for near vision correction and a second plurality of substantially monofocal echellettes for far vision correction. The substantially monofocal echellettes can diffract transmitted light with an efficiency of at least about 90%. The first plurality of substantially monofocal echellettes for near vision correction can be combined with the second plurality of substantially monofocal echellettes for far vision correction so as to provide a distribution of near and far vision correction across the pupil having decreased light scatter, decreased chromatic aberration, and decreased diffraction to other orders such that dysphotopsia is substantially inhibited. The first plurality of substantially monofocal echellettes may comprise a first plurality of full period zones having radial sizes and locations based on the optical power of the near vision correction and design wavelength, and the second plurality of substantially monofocal echellettes may have second full period zones having radial sizes and locations corresponding to the first full period zones, and the second plurality of substantially monofocal echellettes can be placed on the second full period zones located between the first plurality

Problems solved by technology

The presbyopic eye often loses the ability to rapidly and easily refocus on objects at varying distances.

By the age of 65 years, the crystalline lens has often lost almost all elastic properties and has only limited ability to change shape.

Along with reductions in accommodation of the eye, age may also induce clouding of the lens due to the formation of cataracts.

Diffractive multifocal lenses may direct visually significant amounts of light energy at other non-viewing foci, which can contribute to the unwanted light-related visual phenomenon experienced by the patient.

Although multifocal diffractive lenses can be designed and optimized for a particular wavelength, people see in color and vision quality and light scatter can change at visible wavelengths away from the

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