noun Ophthalmology.
- any of several conditions in which there is blindness in half of the visual field, involving one or both eyes.
noun
- loss of vision in either the whole left or the whole right half of the field of visionAlso called: hemianopsia (ˌhɛmɪænˈɒpsɪə)
n.
- Loss of vision in one half of the visual field of one or both eyes.