scotoma

1. An isolated area of diminished vision within the visual field (synset 114579795)
   is a type of: vision defect, visual defect, visual disorder, visual impairment - impairment of the sense of sight
   subtypes:

   • annular scotoma - a circular scotoma surrounding the center of the field of vision
   • central scotoma - a scotoma that involves the fixation point
   • hemianopic scotoma - a scotoma involving half of the visual field
   • paracentral scotoma - a scotoma that is adjacent to the fixation point
   • flittering scotoma, scintillating scotoma - a localized area of diminished vision edged by shimmering colored lights; in many people it indicates the onset of migraine

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