The Collaborative International Dictionary of English v.0.48:

anopsia \a*nop"si*a\ ([.a]*n[o^]p"s[i^]*[.a]), anopsy \an"op`sy\
   ([a^]n"[o^]p`s[y^]), anopia \an*op"i*a\ ]a. [Gr. 'an priv. +
   'o`psis sight.] (Med.)
   Defect or absence of sight; blindness.
   [1913 Webster + AS] anorexy

WordNet (r) 3.0 (2006):

anopia
    n 1: sightlessness (especially because of a structural defect in
         or the absence of an eye)