noun Ophthalmology.

  1. any of several conditions in which there is blindness in half of the visual field, involving one or both eyes.


  1. loss of vision in either the whole left or the whole right half of the field of visionAlso called: hemianopsia (ˌhɛmɪænˈɒpsɪə)


  1. Loss of vision in one half of the visual field of one or both eyes.
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