1.Precision Glass Molding Precision glass molding is a manufacturing technique where optical glass cores are heated to high temperatures until the surface becomes malleable enough to be pressed into an aspheric mold. 2.Precision Polishing For decades, machined aspheric lenses have been ground and polished one lens at a time. 3.Diamond Turning Similar to grinding and polishing, single point diamond turning (SPDT) can be used to manufacture single lenses one at a time. 4.Molded Polymer Aspheres Polymer molding begins with a standard spherical surface, such as an achromatic lens, which is then pressed onto a thin layer of photopolymer in an aspheric mold to give the net result of an aspheric surface. 5.Injection Molding Injection molding allows for the optimization of part cost, complexity of tooling, and precision. Plastic injection molding involves injecting molten plastic into an aspheric mold.