The jagged, shimmering visual sensation resembling the fortifications of a walled medieval town; the scintillating scotoma of migraine. [G. teichos, wall, + opsis, vision]
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n.
shimmering coloured lights, accompanied by blank spots in the visual field (transient scotomata), often seen by sufferers at the beginning of an attack of migraine.
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tei·chop·sia (ti-kopґse-ə) [Gr. teichos wall + -opsia] the sensation of a luminous appearance before the eyes, with a zigzag, wall-like outline; it may be a migraine aura. Called also fortification spectrum, flittering scotoma, and scintillating scotoma.Medical dictionary. 2011.