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US 5,851,328 AGranted
Wafer deforming composite ophthalmic lens method
OwnerGeorge Kohaninventor
Life of this patent
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Abstract
Methods for quickly and inexpensively producing photochromic non-prescription (e.g., sunglasses, safety glasses, reading glasses, etc.), prescription, multifocal and progressive plastic optical quality eyeglass. The lenses are formed by a process wherein a thin wafer lens is deformed to assume the curvature of a base lens. Deformation may be by heat treatment and application of pressure while adhering the wafer lens against a base lens. The invention further concerns lenses produced by the methods. The lenses are characterized by an extremely rapid photochromic response.
Claims20
A method of making a composite lens comprising the steps of:
- (a) pre-manufacturing a first lens and a second lens, each of said first and second lenses having first and second sides;
- (b) orienting said first lens in a plane with one side facing upwardly;
- (c) applying a small amount of a polymerizable adhesive to the upward facing side of said first lens;
- (d) orienting said second lens in a plane substantially parallel to the plane of said first lens;
- and
- (e) bringing said first and second lenses together such that the space between said first and second lenses is completely filled with said polymerizable adhesive material which forms an adhesive layer;
- wherein one of said first and second lenses is a wafer lens and the other of said lenses is a base lens, wherein the surface area or diameter of the wafer and base lenses are essentially the same, wherein the curvature of sides of the wafer lens and base lens to be adhered are different curvatures, wherein said wafer lens is heated prior to step (e), and wherein the curvature of the sides of the wafer lens and base lens to be adhered match after step (e).
4 more elements
Dependencies are inferred from the claim text.