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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Word of the day grammarian
Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar