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There were unbalanced toolholders and cutting tools that were cooled using coolant fluids. More Data, Better Surface Finishes The old method used before obtaining the Makino V33s was low rpm. The final surface finish must be excellent to produce an acceptable lens, because it affects the magnification, according to Carl Zeiss Visions technical manager. The helps them get the mold just right by allowing for better surface finishes and milling the steel in a hardened state. Carl Zeiss attempts to leave the least amount of stock necessary behind for polishing, as to not affect overall accuracy. We really want to get to near net accuracy on these magnifying lamp molds so that there is less polishing, but also so that the polishing does not negatively impact the geometry that has been built into the mold. So we try to take enough time in the mills to give us surface quality and magnification to meet a specific design. Our metal mold operation is in hundredths of diopters of magnification, says Lusignan. This is important because magnification increases as the focal length gets shorter, which is why a prescription for a higher diopter correction means you need more magnification.