| abstract |
The invention is a composite lens that includes a front scratch-resistant polymeric wafer (317) and a back impact-resistant polymeric layer (318). The unique structure allows maximal design flexibility, and is easily and relatively quickly manufactured. The design allows simultaneous optimization of impact and scratch resistance. A polymerizable composition for the rapid preparation of high quality lenses is also provided that includes: a) between 20 and 90 weight percent, and preferably, at least 50 weight percent, of urethane, epoxy, or polyester oligomers end terminated with acrylate or mathacrylate (or mixtures of acrylate and methacrylate); b) between 5 and 50 to 80 percent, preferably between 10 and 40 percent, by weight of an optional diluent, such as a hydrocarbon diol end terminated with acrylate or methacrylate, or mixtures thereof, or a crosslinkable tri-, tetra-, or poly-acrylate or methacrylate, or mixtures thereof; and c) conventional optional additives. |