Ribbon-shaped defect of the visual fields caused by the retinal vessels overlying photoreceptors. [angio- + G. skotoma, dizziness, vertigo]
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an·gio·sco·to·ma -skə-'tō-mə n, pl -mas or -ma·ta -mət-ə a blind spot or defect in the visual field produced by dilated retinal vessels that is esp. prevalent in persons long exposed to high altitudes
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an·gio·sco·to·ma (an″je-o-sko-toґmə) [angio- + scotoma] a cecocentral scotoma caused by shadows of the retinal blood vessels.Medical dictionary. 2011.