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Figure 4: Homonymous hemianopia as a result of a cerebrovascular event

Homonymous hemianopia 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.

Source  Shutterstock.com / MAG