Scotoma Scintillating scotoma 2010-07-10T03:35:29Z A scintillating scotoma is a common visual aura that can precede a migraine, whereby a spot of flickering light near the center of the visual fields occurs. The spot prevents vision, and is thus termed scotoma. The scotoma can extend into one or more shimmering arcs of white or colored flashing lights. UMLS:C0235068 SNOMEDCT_US:2228002 HP:0010822