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varifocal

/ (ˈvɛərɪˌfəʊkəl) /
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adjective
optics having a focus that can vary
relating to a lens that is graduated to permit any length of vision between near and distant
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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