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In medicine, a hemianopsia is a neurological sign (medical) on physical examination that is "partial or complete loss of vision in one half of the visual field(s) of one or both eyes."[1]


Subtypes include:

  • Altitudinal hemianopsia, "characterized by a visual defect above or below the horizontal meridian of the visual field."[1]
  • Homonymous hemianopsia "refers to a visual defect that affects both eyes equally, and occurs either to the left or right of the midline of the visual field."[1]
  • Binasal hemianopsia "consists of loss of vision in the nasal hemifields of both eyes."[1]
  • Bitemporal hemianopsia is the "bilateral loss of vision in the temporal fields."[1]
  • Quadrantanopsia "refers to loss of vision in one quarter of the visual field in one or both eyes."[1]