ametropia

from WordNet (r) 3.0 (2006)

ametropia
    n 1: (ophthalmology) faulty refraction of light rays in the eye
         as in astigmatism or myopia

from The Collaborative International Dictionary of English v.0.48

ametropia \am`e*tro"pi*a\ ([a^]m`[-e]*tr[=o]"p[i^]*[.a]), n.
   [Gr. 'a`metros irregular + 'w`ps, 'wpo`s, eye.] (Med.)
   A visual impairment resulting from faulty refraction of light
   rays in the eye. Subtypes include {myopia} {astigmatism} and
   {hyperopia}. -- {Am`e*trop"ic} ([a^]m`[-e]*tr[o^]p"[i^]k), a.
   AS
   [1913 Webster +PJC]