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dioptometer

[dahy-op-tom-i-ter] /ˌdaɪ ɒpˈtɒm ɪ tər/
noun, Ophthalmology
1.
an instrument for measuring the refraction of the eye.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for dioptometer

dioptometer

/ˌdaɪɒpˈtɒmɪtə/
noun
1.
an instrument for measuring ocular refraction
Derived Forms
dioptometry, 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
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