angioscotoma

noun
an·gio·sco·to·ma | \-skə-ˈtō-mə \
plural angioscotomas or angioscotomata\-mət-ə \

Medical Definition of angioscotoma 

: a blind spot or defect in the visual field produced by dilated retinal vessels that is especially prevalent in persons long exposed to high altitudes

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