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optometer

American

[op-tom-i-ter] / ɒpˈtɒm ɪ tər /

noun

any of various instruments for measuring the refractive error of an eye.

optometer British

/ ɒpˈtɒmɪtə /

noun

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

Etymology

Origin of optometer

First recorded in 1730–40; opto- + -meter

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The owl was Billy’s optometer in his office in Ilium.

From Literature

An optometer is an instrument for measuring refractive errors in eyes— in order that corrective lenses may be prescribed.

From Literature

Opsiometer, op-si-om′e-tėr, n. an optometer.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023