Multi-layered gradient index progressive lens
OwnerDonald A. Volkinventor
Life of this patent
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Abstract
The present invention relates to a gradient index progressive addition spectacle lens that provides improved optical performance and a wide visual field. The lens comprises a plurality of axially layered and bonded lens sections of continuous curvature at least one of which has a refractive index gradient oriented transverse to a meridian of the lens that functions as a progressive intermediate vision zone between viewing portions of different refractive index that provide the refractive powers for corresponding vision portions of the lens. The other layer(s) of the lens incorporates a generally constant or similarly changing refractive index.
Claims25
A gradient index lens formed of at least two layers, one having a positive power and the other having a negative power, one of the two layers being a first layer and having three portions, a first portion with a first, refractive index, a second portion with a second, refractive index, and a third portion between the first and second portions extending transverse to a meridian of the lens with a gradient refractive index that varies continuously between the first and second refractive indices.
Dependencies are inferred from the claim text.