Summary of Homonymous hemianopsia
Hemianopsia is visual field loss on the left or right side of the vertical midline. Homonymous hemianopsia is hemianopic visual field loss on the same side of both eyes. Homonymous hemianopsia occurs because the right half of the brain has visual pathways for the left hemifield of both eyes, and the left half of the brain has visual pathways for the right hemifield of both eyes. When one of these pathways is damaged, the corresponding visual field is lost.