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

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

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

From Project Gutenberg

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

From Project Gutenberg