scotoma

/skəˈtoʊmə/

Definitions of scotoma

1. noun

   an isolated area of diminished vision within the visual field
   types:

   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

   type of:

   vision defect, visual defect, visual disorder, visual impairment

   impairment of the sense of sight