anisometropia

from WordNet (r) 3.0 (2006)

anisometropia
    n 1: difference in the refractive power of the two eyes

from The Collaborative International Dictionary of English v.0.48

Anisometropia \An`i*so*me*tro"pi*a\, n. [NL., fr. Gr. ? + ?
   measure + ?, ?, eye.]
   Unequal refractive power in the two eyes.
   [Webster 1913 Suppl.]