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optometer

[op-tom-i-ter]
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noun
  1. any of various instruments for measuring the refractive error of an eye.

Origin of optometer

First recorded in 1730–40; opto- + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for optometer

Historical Examples

  • In using the optometer, find the place where vision of the dots is the easiest and most distinct.

    Degeneracy

    Eugene S. Talbot

  • Test with optometer, and in reporting use the number on the stem preceded by F for far-sightedness, and N for near-sightedness.

    Degeneracy

    Eugene S. Talbot

  • Now, the Javal-Bull optometer permits of a quick determination of the value of the amplitude of accommodation in dioptries.


British Dictionary definitions for optometer

optometer

noun
  1. any of various instruments for measuring the refractive power of the eye
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

optometer in Medicine

optometer

(ŏp-tŏmĭ-tər)
n.
  1. An instrument for determining the refraction of the eye.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.