The Collaborative International Dictionary
Hemiopia
Hemiopia \Hem`i*o"pi*a\, Hemiopsia \Hem`i*op"si*a\, n. [NL., fr. Gr. ? half + Gr. ? sight.] (Med.) A defect of vision in consequence of which a person sees but half of an object looked at.
Wiktionary
hemiopia
n. hemianopia