Intraocular lenses that improve peripheral vision
Lenses and methods are provided for improving peripheral and/or central vision for patients who suffer from certain retinal conditions that reduce central vision or patients who have undergone cataract surgery. The lens is configured to improve vision by having an optic configured to focus light incident along a direction parallel to an optical axis at the fovea in order to produce a functional foveal image. The optic is configured to focus light incident on the patient's eye at an oblique angle with respect to the optical axis at a peripheral retinal location disposed at a distance from the fovea, the peripheral retinal location having an eccentricity between −30 degrees and 30 degrees. The image quality at the peripheral retinal location is improved by reducing at least one optical aberration at the peripheral retinal location. The method for improving vision utilizes ocular measurements to iteratively adjust the shape factor of the lens to reduce peripheral refractive errors.
1. A method of designing an intraocular lens, the method comprising:
receiving ocular measurements for a patient;
selecting an intraocular lens having an initial shape factor;
determining a final shape factor of the intraocular lens by iteratively adjusting the initial shape factor to reduce peripheral refractive errors at one or more visual field angles between −30 degrees and 30 degrees, with respect to an optical axis at the fovea, below a threshold value,
wherein the intraocular lens comprises an optic comprising:
a first aspheric surface; and
a second aspheric surface opposite the first aspheric surface,
wherein the first aspheric surface is concave, and the second aspheric surface is convex,
wherein one of the first and second aspheric surfaces comprises an achromatic optical element,
wherein the optic comprises a meniscus lens having the first aspheric surface and the second aspheric surface,
wherein the optic is configured to focus light incident along a direction parallel to the optical axis at the fovea to produce a functional foveal image,
wherein the optic is configured to focus light incident on a patient's eye at an oblique angle with respect to the optical axis at a peripheral retinal location disposed at a distance from the fovea, the peripheral retinal location having an eccentricity between −30 degrees and 30 degrees with respect to the optical axis,
wherein iteratively adjusting the initial shape factor includes adjusting at least one of (i) a curvature of the surfaces of the optic, (ii) a central thickness of the optic, (iii) an axial position of the optic from the iris of the patient's eye, and (iv) the asphericity of the surfaces of the optic, until said peripheral refractive errors at said one or more visual field angles between −30 degrees and 30 degrees are below said threshold value.
2. The method of claim 1 , wherein the final shape factor of the intraocular lens is between −3 and −0.5.
3. The method of claim 1 , wherein a peripheral defocus for visual field angles between −30 degrees and 30 degrees with respect to the optical axis is less than about 1.0 Diopter when the intraocular lens having the final shape factor is implanted in the patient's eye.
4. The method of claim 1 , wherein a peripheral astigmatism for visual field angles between −30 degrees and 30 degrees with respect to the optical axis is less than about 1.5 Diopter when the intraocular lens having the final shape factor is implanted in the patient's eye.