optometer

American  

[op-tom-i-ter] / ɒpˈtɒm ɪ tər /

noun

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

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optometer British  

/ ɒpˈtɒmɪtə /

noun

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

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Etymology

Origin of optometer

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

Example Sentences

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

From "Slaughterhouse-Five" by Kurt Vonnegut

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

From "Slaughterhouse-Five" by Kurt Vonnegut

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

From Degeneracy Its Causes, Signs and Results by Talbot, Eugene S.

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

From Scientific American Supplement, No. 620, November 19,1887 by Various

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

From Degeneracy Its Causes, Signs and Results by Talbot, Eugene S.