G - Physics – 02 – B
Patent
G - Physics
02
B
18/104, 88/38
G02B 1/04 (2006.01) B29D 11/00 (2006.01) G02C 7/02 (2006.01)
Patent
CA 2004060
COMPOSITE PLASTIC LENS AND METHOD OF MAKING THE SAME Abstract The composite plastic lens includes an anterior plastic lens having a first corrective feature and a posterior plastic lens having a second corrective feature. The anterior and posterior lenses are joined together by an adhesive that bonds opposing, etched surfaces of those lenses. The method of making the composite plastic lens includes, in one embodiment, the steps of etching the front and rear surfaces of the posterior and anterior lenses and bonding those etched surfaces together with an adhesive. Another method of making the composite plastic lens includes heating the lenses in a bath prior to bonding them together for a time such that the posterior and anterior lenses return to their original shape and curvature. In a further refinement, one of the lenses, preferably the anterior lens, has an optical center axis that is decentered with respect to the geometric center axis of the lens. Both lenses are disposed atop one another such that when their optical center axes are combined, the resultant optical center axis or principal axis of the composite lens is at a predetermined position relative to the bifocal, multifocal or progressive lens feature carried by the anterior lens.
Marks & Clerk
Merle Joseph
LandOfFree
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