scintillating scotoma

Medical Dictionary

scintillating scotoma scin·til·lat·ing scotoma (sĭn'tl-ā'tĭng)
n.
A localized area of blindness that may follow the appearance of brilliantly colored shimmering lights and is associated with the aura of migraine.

The American Heritage® Stedman's Medical Dictionary
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WordNet
scintillating scotoma

noun
a localized area of diminished vision edged by shimmering colored lights; in many people it indicates the onset of migraine 
WordNet® 3.0, © 2006 by Princeton University.
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