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The Collaborative International Dictionary
Hemiopsia

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
hemiopsia

n. hemianopsia