optometer

[ op-tom-i-ter ]

noun

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

optometer

/ ɒpˈtɒmɪtə /

noun

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

Word History and Origins

Origin of optometer¹

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

Example Sentences

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