Multifocal intraocular lenses
First Claim
1. A multifocal intraocular lens which comprises a lens body having at least five optical zones, a first zone comprising a central constant power zone for distance vision, a second zone comprising an annular aspheric zone, a third zone comprising a constant power zone for near vision, a fourth zone comprising an aspheric zone to bring the power back to the distance vision level and a fifth zone comprising a constant power zone for distance vision, whereby the radii for each optical zone is determined to minimize spherical aberrations and wherein the percent optical area for near and distance vision is calculated based on pupillary diameter and variation of pupillary apertures in humans for whom said lenses are designed.
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Abstract
A multifocal intraocular lens is produced which comprises a lens body having a plurality of optical zones which comprises an aspheric optical zone between each add and base power zone thereby providing a gradual transition in the curvature of the optic surface and avoiding abrupt changes in the curvature of the optic.
152 Citations
12 Claims
- 1. A multifocal intraocular lens which comprises a lens body having at least five optical zones, a first zone comprising a central constant power zone for distance vision, a second zone comprising an annular aspheric zone, a third zone comprising a constant power zone for near vision, a fourth zone comprising an aspheric zone to bring the power back to the distance vision level and a fifth zone comprising a constant power zone for distance vision, whereby the radii for each optical zone is determined to minimize spherical aberrations and wherein the percent optical area for near and distance vision is calculated based on pupillary diameter and variation of pupillary apertures in humans for whom said lenses are designed.
Specification