any of various instruments for measuring the refractive power of the eye
optometer in American English
(ɑpˈtɑmətər)
noun
an instrument for determining error in the refractive power of the eye
Word origin
see optic & -meter
optometer in American English
(ɑpˈtɑmɪtər)
noun
any of various instruments for measuring the refractive error of an eye
Word origin
[1730–40; opto- + -meter]This word is first recorded in the period 1730–40. Other words that entered Englishat around the same time include: canteen, humbug, maximum, optimism, thesaurus-meter is a combining form meaning “measure,” used in the names of instruments measuringquantity, extent, degree, etc. Other words that use the affix -meter include: interferometer, micrometer, spectrometer, telemeter, variometer