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dioptometer

[dahy-op-tom-i-ter]
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noun Ophthalmology.
  1. an instrument for measuring the refraction of the eye.
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Origin of dioptometer

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for dioptometer

dioptometer

noun
  1. an instrument for measuring ocular refraction
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Derived Formsdioptometry, noun

Word Origin

from di- ² + opt (ic) + meter
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