US 2003/0202155 A1 · Multi-focal contact lens

Abstract

The contact lens has a fused construction with improved comfort, reduced optical distortions, such as halos, reduced discontinuities, and improved mechanical stability. The lens has an inside portion extending from a periphery of the lens over a concave side of the lens, and a second central exterior portion fused to the first portion. A central zone provides a first optic power and a first concentric band providing a second optic power. A central interface between the first and second portions has a curvature substantially the same as a curvature of the concave side. The second portion forms a junction with the first portion on a convex side of the lens substantially outside of a field of view of a user's eye. A transition profile between the junction and the central interface determines, along with the first and the second indices of refraction, the second optic power.

Claims11

Dependent claims

A fused multi-focal contact lens comprising:

a first portion having a first index of refraction;
a second portion fused to the first portion and having a second index of refraction different from said first index of refraction, wherein:
said lens comprises a central zone providing a first optic power and a first concentric band providing a second optic power;
a central interface between said first portion and said second portion within said central zone having a curvature substantially the same as a curvature of said concave side such that a thickness of one of said first and second portions is substantially constant, whereby the mechanical properties of said lens are more stable;
said second portion forms a junction with said first portion substantially outside of a field of view of a user's eye;
and
a transition profile between said junction and said central interface determines, along with said first and said second indices of refraction, said second optic power.

4 more elements

Dependencies are inferred from the claim text.

Multi-focal contact lens

Life of this patent

Multi-focal contact lens

Life of this patent

Abstract

Claims11