Definition

Hemianopsia is a term that describes a loss of vision that affects half of the visual field of one eye or both eyes.

Description

Hemianopsia prevents an individual from seeing objects in half of the visual field of a particular eye. As a result, an individual suffering from hemianopsia will not see objects that are in the affected visual field.

Causes and symptoms

Conditions or injuries that affect the optic nerve can cause hemianopsia. The sequelae (aftereffects) of stroke, brain aneurysm, occlusion of the optic artery, brain tumors, or traumatic head injuries can all result in hemianopsia. Occasionally, individuals who suffer from migraine headaches may experience hemianopsia during a migrainous episode or as part of the prodromal aura that precedes the actual