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

  • n. An eye abnormality, such as nearsightedness, farsightedness, or astigmatism, resulting from faulty refractive ability of the eye.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of several disorders of the eye (spherical or cylindrical) resulting from faulty refractive ability.

from the GNU version of the Collaborative International Dictionary of English

  • n. a visual impairment resulting from faulty refraction of light rays in the eye. Subtypes include myopia astigmatism and hyperopia.

from The Century Dictionary and Cyclopedia

  • n. A condition of the eye which is abnormal with respect to refraction: the opposite of emmetropia. It comprises myopia, hypermetropia, presbyopia, and astigmatism. See these words.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia


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

Greek ametros, without measure (a-, without; see a-1 + metron, measure; see meter1) + -opia.


  • I have discovered ametropia in the particular form of irregular astigmatism.

    Mr. World and Miss Church-Member A twentieth century allegory

  • They are amblyopic, and this is due partially to a high degree of ametropia (caused by crushing of the eyeball in the endeavor to shut out light) and from retinal exhaustion and nystagmus.

    Anomalies and Curiosities of Medicine

  • Incorporating patented HyperBond (TM) technology and HydrolEyes (TM) surface science, the SynergEyes (R) contact lenses with FDA market clearance include: SynergEyes (R) A for naturally occurring ametropia, targeting patients with astigmatism, current gas permeable lens wearers, and patients demanding optimized vision; the SynergEyes (R) Multifocal lens for presbyopia;


  • - severe, usually congenital, mental deficiency. ametropia



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