noun Ophthalmology.
faulty refraction of light rays by the eye, as in astigmatism or myopia.

1875–80; < Greek ámetr(os) unmeasured (a- a-6 + métr(on) measure + -os adj. suffix) + -opia

ametropic [am-i-trop-ik, -troh-pik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ametropia (ˌæmɪˈtrəʊpɪə)
loss of ability to focus images on the retina, caused by an imperfection in the refractive function of the eye
[C19: New Latin, from Greek ametros unmeasured (from a-1 + metron measure) + ōps eye]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ametropia am·e·tro·pi·a (ām'ĭ-trō'pē-ə)
An eye abnormality, such as nearsightedness, farsightedness, or astigmatism, resulting from faulty refractive ability of the eye.

am'e·trop'ic (-trŏp'ĭk, -trō'pĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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