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Over the past two decades, precision glass molding has gradually become a competitive§hot-replicating manufacturing technology for precision glass optical components. But§form errors occur on surface of molded glass optics as a result of a diverse range of effects§including viscoelastic relaxation and thermal shrinkage of optical glass material during the§molding and cooling processes. Conventionally these errors can be compensated solely§via time-consuming and cost-intensive try-out molding experiments.