The Collaborative International Dictionary of English v.0.48:

Aphakia \A*pha"ki*a\, n. [NL.; Gr. 'a priv. + ? seed of a
   lentil.] (Med.)
   An anomalous state of refraction caused by the absence of the
   crystalline lens, as after operations for cataract. The
   remedy is the use of powerful convex lenses. --Dunglison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aphakia
    n 1: absence of the natural lens of the eye (usually resulting
         from the removal of cataracts)