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Hemianopsia refers to a decrease in vision or blindness in one-half of the visual field. Hemianopsia can be caused by damage to the brain (e.g., stroke or brain tumor), eye, or optic nerve. People with hemianopsia may have trouble seeing things on the side of their field of vision opposite to the damaged side. For example, if the right side of their brain has been damaged, they may have trouble seeing anything on the left side of their visual field.
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