Source : Webster's Revised Unabridged Dictionary (1913)

Anorthopia \An`or*tho"pi*a\, n. [NL., fr. Gr. ? priv. + ortho- +
   Gr. ?, ?, the eye.] (Med.)
   Distorted vision, in which straight lines appear bent.

Source : WordNet®

anorthopia
     n : distorted vision in which straight lines appear curved