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English to Spanish translations [PRO] Tech/Engineering - Medical: Instruments / Optics / description of lens
English term or phrase:diameter block
While stress may be the result of the manufacturing process, in can also be created during the surfacing or finishing process. Generating a polycarbonate lens before the blocking alloy is completely hardened can cause the lens to flex during cutting, resulting in an optical error in the center of the lens. Using small diameter blocks can cause flexure during surfacing creating an optical error in the area just outside the block diameter.