quadrantanopia

quadrantanopia
Loss of vision in a quarter section of the visual field of one or both eyes; if bilateral, it may be homonymous or heteronymous, binasal or bitemporal, or crossed, e.g., involving the upper quadrant in one eye and the lower quadrant in the other. SYN: quadrantic hemianopia.

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n.
absence or loss of one quarter of the visual field (i.e. upper nasal (inner), upper temporal (outer), lower nasal (inner), or lower temporal (outer)).

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quad·rant·an·o·pia (kwod″rənt-ə-noґpe-ə) [quadrant + an-1 + -opia] hemianopia in one fourth of the visual field, bounded by a vertical and a horizontal radius. Called also tetartanopia and quadrant hemianopia.

Medical dictionary. 2011.

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