Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An instrument that is used for measuring ocular refraction.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An instrument used to measure ocular refraction, in order to prescribe corrective lenses

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[di(a)– + opt(ic) + –meter.]

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