Plastic lenses and method of making same

Claim 1

THE PROCESS OF MAKING A COPOLYMERIZED LENS HAVING A CONVEX SURFACE AND A CONCAVE SURFACE WITH A MONOMER MIXTURE OF METHYL METHACRYLATE AND DIETHYLENE GLYCOL BIS (ALLYL CARBONATE) WHICH COMPRISES MIXING TOGETHER IN AN EVACUABLE CONTAINEER METHYL METHACRYLATE AND DIETHYLENE GLYCOL BIS (ALLYL CARBONATE) WITH THE MONOMER METHYL METHACRYLATE RANGING FROM 11 TO 13% BY WEIGHT OF THE MONOMER MIXTURE AND THE MONOMER DIETHYLENE GLYCOL BIS (ALLYL CARBONATE) RANGING FROM 89 TO 87% BY WEIGHT OF THE MONOMER MIXTURE, ADDING TO THE MONOMER MIXTURE A CATALYST OF BENZOYL PEROXIDE RANGING FROM 1 TO 1.5% BY WEIGHT OF THE MONOMER MIXTURE OF METHYL METHACRYLATE AND DIETHYLENE GLYCOL BIS (ALLYL CARBONATE), DRYING THE MIXTURE TO REMOVE ANY WATER THEREIN, EVACUATING THE AIR FROM THE EVACUABLE CONTAINER CONTAINING THE MIXTURE, FOLLOWED BY PRESSURIZING THE EVACUABLE CONTAINER WITH NITROGEN GAS TO PREVENT FORMATION OF BUBBLES IN THE LENS DURING THE CURING CYCLE, FORCING THE MIXTURE INTO A MOLD FOLLOWED BY COPOLYMERIZING THE MIXTURE BY CURING THE MIXTURE IN AN OVEN AT ABOUT 65* C. FOR A MINIMUM OF ABOUT THREE HOURS FOLLOWED BY RAISING THE TEMPERATURE FROM ABOUT 65* TO ABOUT 75*C. IN A MININUM OF ABOUT 4 HOURS, FOLLOWED BY RAISING THE TEMPERATURE FROM ABOUT 75*C. TO ABOUT 100*C. IN A MININUM OF ABOUT 10 HOURS AND THEN STRIPPING THE COPOLYMERIZED LENS FROM THE MOLD.