| Homonymous hemianopsia | |
|---|---|
 | |
| Paris as seen with left homonymous hemianopsia | |
| Specialty | Ophthalmology  |
| Symptoms | Clumsiness, decreased night visions, difficulty of straight line walking, distorted sight, doubled vision, frequent turning of the head away from the side where it’s present, lack of awareness where it’s present, visual hallucinations |
| Causes | Brain bleed, brain inflammation, brain tumor, dementia, epilepsy, lymphoma, other kinds of brain injuries, and stroke |
| Diagnostic method | Magnetic resonance imaging |
Hemianopsia, or hemianopia, is a visual field loss on the left or right side of the vertical midline. It can affect one eye but usually affects both eyes.
Homonymous hemianopsia (or 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.