Patent ID: 6733125
Filing Date: 2004-05-11
Classification: G02C

Abstract:
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.