Loss of vision in half of the visual field, typically affecting the same side in both eyes. It usually results from brain lesions affecting the optic pathways, commonly due to stroke or tumors.
From Greek 'hemi-' (half) + 'an-' (without) + 'ops' (vision), literally meaning 'half without vision.' The term was coined in the late 19th century as neurologists mapped the visual pathways in the brain.
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