Methods of obtaining ophthalmic lenses providing the eye with reduced aberrations

Abstract

An intraocular lens comprises optical part configured to be implanted in an eye of a subject. The intraocular lens further comprises at least one aspheric surface configured, in combination with a lens in the capsular bag of an eye, to reduce an aberration of a wavefront passing the eye. The aberrations may include astigmatism, coma, and / or spherical aberrations. An aberration of the intraocular lens may be expressed as a linear combination of Zernike polynomial terms that may include a Zernike coefficient a11. The Zernike coefficient a11 may be selected to reduce a spherical aberration of a wavefront passing the eye and / or to compensate for an average value resulting from a predetermined number of estimations of the Zernike coefficient a11 in a population of corneas and capsular bag lenses.

Description

RELATED APPLICATIONS [0001] This application is a continuation of prior application U.S. application Ser. No. 10 / 768,755, filed Jan. 30, 2004, which is a divisional of U.S. application Ser. No. 10 / 027,703, filed Dec. 21, 2001, now U.S. Pat. No. 6,705,729, issued on Mar. 16, 2004, which claims priority to U.S. Provisional Application No. 60 / 259,981, filed Jan. 5, 2001, and Swedish Application No. 0004829-8, file Dec. 22, 2000.FIELD OF INVENTION [0002] The present invention relates to methods of designing and selecting ophthalmic lenses that provide the eye with reduced aberrations as well as lenses capable of providing such visual improvements. BACKGROUND OF THE INVENTION [0003] Beside first order defocus and astigmatism of the eye a number of other vision defects could be present. For example aberrations of different orders occur when a wavefront passes a refracting surface. The wavefront itself becomes aspheric when it passes an optical surface that has imperfections and vision def...

AI Technical Summary

Benefits of technology

[0013] It is another object of the invention to provide methods of obtaining an intraocular lens capable of reducing the aberration of the eye after its implantation into the eye.

[0015] It is a still further object of the present invention to provide an intraocular lens which, together with a lens in the capsular bag, is capable of restoring a wavefront deviating from sphericity into a substantially more spherical wavefront.

[0016] It is a further object of the invention to provide an intraocular lens, which improves the visual quality for patients who have undergone a corneal surgery or who have corneal defects or diseases.

Problems solved by technology

The wavefront itself becomes aspheric when it passes an optical surface that has imperfections and vision defects occur when an aspheric wavefront falls on the retina.

This result can be explained by the fact that present IOLs are not adapted to compensate for age-related defects of the optical system of the human eye.

Even if intraocular lenses aimed to substitute the defective cataract lens and other ophthalmic lenses, such as conventional contact lenses or intraocular correction lenses, have been developed with excellent optical quality, it is obvious that they fail to correct for a number of aberration phenomena of the eye including age-related aberration defects.

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