n. a condition wherein there is partial loss of vision. Specifically, the individual is partly blind in the inner half of the left and right visual field.The condition is caused by a lesion in the eye or an injury to the optic chiasm. See binasal hemianopsia- also hemianopia.

BINASAL HEMIANOPIA: "Hydrocephalus is an example of a congenital disease which can compress the brain and cause binasal hemianopia."