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