Definitions

from The Century Dictionary.

  • noun An instrument for measuring the refractive powers of the eye. Also optimeter.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Physiol.) An instrument for measuring the distance of distinct vision, mainly for the selection of eveglasses.

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

  • noun An instrument for measuring the focus of the lens of the eye.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

from optic + meter

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