US 8,801,781 B2Granted

Intraocular lens for correcting corneal coma

AssigneeAbbott Medical Optics Inc.

InventorsJuan Tabernero, Pablo Artal, Patricia Piers

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Abstract

When fitting a patient for an intraocular lens, a series of measurements is taken on the patient's eye that determines a required lens power. Next, a range of preferred shape factors may be found, which determine the base (i.e., spherical) radii of the two lens surfaces, essentially independent of the lens power. The preferred shape factor adjusts the third-order coma of the lens to largely offset the coma of the cornea, so that the image at the retina has a reduced amount of third-order coma. Once a preferred shape factor is determined, the base radii of curvature of the anterior and posterior surfaces are determined from the shape factor and the lens power by algebraic formulas. Finally, one or more aspheric terms are added to one or both of the surfaces in the lens, so that the spherical aberration of the lens largely offsets the spherical aberration of the cornea.

Claims21

Dependent claims

An intraocular lens having an optical power and a shape factor for implantation in an eye of a patient in which the natural lens has been removed, the eye having a cornea, a retina, and an axial length defined by a distance between the cornea and the retina, the cornea having a radius of curvature and a coma, the coma having a sign, comprising:

an anterior surface having an anterior radius, Ra;
a posterior surface having a posterior radius, Rp;
and
an aspheric surface on at least one of the anterior surface and the posterior surface, wherein the aspheric surface reduces spherical aberration of the cornea;
wherein the anterior radius and the posterior radius determine the optical power and the shape factor;
wherein the shape factor is negative, with a lower limit of about −3;
wherein the intraocular lens has a coma based on the shape factor, the intraocular lens coma having a sign opposite to the sign of the cornea coma;
and
wherein the optical power of the intraocular lens is between 0 diopters and 30 diopters selected from the group consisting of 5 diopters, 10 diopters, 15 diopters, 20 diopters, 25 diopters, and 30 diopters;
wherein the intraocular lens with an optical power of 5 diopters has a shape factor between about −3 and about −2.2;
wherein the intraocular lens with an optical power of 10 diopters has a shape factor between about −1.9 and −1.5;
wherein the intraocular lens with an optical power of 15 diopters has a shape factor between about −1.3 and −1.1;
wherein the intraocular lens with an optical power of 20 diopters has a shape factor between about −1.0 and −0.8;
wherein the intraocular lens with an optical power of 25 diopters has a shape factor between about −0.8 and −0.7;
wherein the intraocular lens with an optical power of 30 diopters has a shape factor between about −0.6 and −0.5;
and
wherein the coma of the intraocular lens minimizes the coma of the cornea when light passes through both the cornea and the intraocular lens sequentially.

14 more elements

An intraocular lens having an optical power for implantation in an eye having a cornea, a retina, and an axial length defined by a distance between the cornea and the retina, the cornea having a radius of curvature and a coma, the intraocular lens comprising:

an anterior surface having an anterior radius, Ra;
a posterior surface having a posterior radius, Rp;
wherein the optical power, P, and a shape factor, X, are defined at least by the anterior radius and the posterior radius;
wherein the shape factor X is negative, with a lower limit of about −3;
wherein the intraocular lens has a coma based on the shape factor, the intraocular lens coma having a sign opposite to the sign of the cornea coma;
wherein the optical power P of the intraocular lens correlates to at least one of the axial length of the eye and the radius of curvature of the cornea and is between 0 diopters and 30 diopters selected from the group consisting of 5 diopters, 10 diopters, 15 diopters, 20 diopters, 25 diopters, and 30 diopters;
wherein the intraocular lens with an optical power of 5 diopters has a shape factor between about −3 and about −2.2;
wherein the intraocular lens with an optical power of 10 diopters has a shape factor between about −1.9 and −1.5;
wherein the intraocular lens with an optical power of 15 diopters has a shape factor between about −1.3 and −1.1;
wherein the intraocular lens with an optical power of 20 diopters has a shape factor between about −1.0 and −0.8;
wherein the intraocular lens with an optical power of 25 diopters has a shape factor between about −0.8 and −0.7;
wherein the intraocular lens with an optical power of 30 diopters has a shape factor between about −0.6 and −0.5;
wherein the intraocular lens coma minimizes the coma of the cornea when light passes through both the cornea and the intraocular lens sequentially;
wherein at least one of the surfaces is an aspheric surface;
and
wherein the aspheric surface reduces a spherical aberration of the cornea for the value of optical power.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/260,013Filed 26 Oct 2005
Published: US 2007/0093891 A126 Apr 2007
Granted: 12 Aug 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

A61B 3/0025
Operational features thereof: characterised by electronic signal processing, e.g. eye models
A61F 2/1613
Intraocular lenses: having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative…
A61B
Medical diagnosis and surgery
A61F
Filters implantable into blood vessels