Definition of optometer in English:

optometer

Line breaks: op¦tom|eter
Pronunciation: /ɒpˈtɒmɪtə
 
/

noun

  • An instrument for testing the refractive power of the eye.
    More example sentences
    • He immediately became hypermetropic (long sighted) in that eye, but using his optometer found ‘the same inequality in the horizontal and vertical refractions as without the water’.
    • We have developed an optometer to measure the ocular astigmatism of human eyes and tested its performance.

Origin

mid 18th century: from Greek optos 'seen' + -meter.

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