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[em-i-troh-pee-uh] /ˌɛm ɪˈtroʊ pi ə/
noun, Ophthalmology.
the normal refractive condition of the eye, in which the rays of light are accurately focused on the retina.
Origin of emmetropia
1860-65; < New Latin, equivalent to emmetr- (stem of Greek émmetros in measure, equivalent to em- em-2 + métr(on) measure + -os adj. suffix) + -opia -opia
Related forms
emmetrope, noun
[em-i-trop-ik, -troh-pik] /ˌɛm ɪˈtrɒp ɪk, -ˈtroʊ pɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for emmetropia
Historical Examples
  • Visual acuteness on both sides 5/12, the left slightly better than the right; emmetropia in mydriasis by atropine.

    Schweigger on Squint C. Schweigger
  • It may, therefore, be useful for our purpose to cite a few cases of periodic convergent strabismus with emmetropia.

    Schweigger on Squint C. Schweigger
  • I have occasionally seen periodic accommodative squint with emmetropia of the fixing eye.

    Schweigger on Squint C. Schweigger
  • Therefore we see the same form of squint arise less often in emmetropia (see Case 45) when childhood is past, than in myopia.

    Schweigger on Squint C. Schweigger
  • Those cases deserve special consideration in which emmetropia is present in one eye, in the other myopia.

    Schweigger on Squint C. Schweigger
  • emmetropia on both sides, visual acuteness nearly perfect on the right, on the left 2/3 of the normal.

    Schweigger on Squint C. Schweigger
  • (a) In myopia, emmetropia, and doubtful hypermetropia, with convergent and divergent squint together 329 cases.

    Schweigger on Squint C. Schweigger
  • emmetropia, determined with atropine on both sides and good visual acuteness.

    Schweigger on Squint C. Schweigger
British Dictionary definitions for emmetropia


the normal condition of perfect vision, in which parallel light rays are focused on the retina without the need for accommodation
Derived Forms
emmetropic (ˌɛmɪˈtrɒpɪk) adjective
Word Origin
C19: from New Latin, from Greek emmetros in due measure + -opia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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emmetropia in Medicine

emmetropia em·me·tro·pi·a (ěm'ĭ-trō'pē-ə)
The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.

em'me·trop'ic (-trŏp'ĭk, -trō'pĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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