Patent ID: 8147727
Filing Date: 2012-04-03
Classification: B29C,B29D,B29L,Y10S

Abstract:
1. A method of making an ophthalmic lens, the method comprising: providing a first mold section having a first cavity surface and a first peripheral region extending outward from the first cavity surface to an outer peripheral edge of the first peripheral region; providing a second mold section having a second cavity surface and a second peripheral region extending outward from the second cavity surface to an outer peripheral edge; providing a polymerizable composition on at least one of the first and second mold sections; attaching together the first mold section and the second mold section to define a cavity therebetween containing the polymerizable composition by applying heat energy to a plurality of discrete spaced apart regions, the plurality of discrete spaced apart regions being located along the first peripheral region between the first cavity surface and the outer peripheral edge of the first peripheral region and along the second peripheral region between the second cavity surface and the outer peripheral edge of the second peripheral region, the applying energy being effective to melt mold material from the first peripheral region and the second peripheral region to form molten mold material at the plurality of discrete spaced apart regions, the molten mold material occupying a space between the first mold section and the second mold section thereby causing the first mold section and the second mold section to fuse together to form a mold assembly; and subjecting the polymerizable composition in the mold assembly to conditions effective to form an ophthalmic lens from the polymerizable composition; wherein the step of applying heat energy comprises passing an elongated element through the first peripheral region and into the second peripheral region.