Disease or Syndrome
hemianopsia Audio
hem·i·a·nop·si·a [ hem-ee-uh-nop-see-uh ]
Subclass of:
Vision Disorders; Blindness
Etymology:
Greek hemi = half + an = not + opsis = vision; in other words, one half not seeing
Definitions related to hemianopsia:
  • Poor vision or blindness in half of the visual field, affecting one or both eyes.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • Lack of sight in half of the normal field of vision.
    NCI
    U.S. National Cancer Institute, 2021
  • Partial or complete loss of vision in one half of the visual field(s) of one or both eyes. Subtypes include altitudinal hemianopsia, characterized by a visual defect above or below the horizontal meridian of the visual field. 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. Binasal hemianopsia consists of loss of vision in the nasal hemifields of both eyes. Bitemporal hemianopsia is the bilateral loss of vision in the temporal fields. Quadrantanopsia refers to loss of vision in one quarter of the visual field in one or both eyes.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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