![]() People with migraines often self-report triggers for migraines involving stress or foods, or bright lights. Migraines, in turn, may be caused by genetic influences and hormones. Scintillating scotomas are most commonly caused by cortical spreading depression, a pattern of changes in the behavior of nerves in the brain during a migraine. Sufferers can keep a diary of dates on which the episodes occur to show to their physician, plus a small sketch of the anomaly, which may vary between episodes.Ī depiction of a scintillating scotoma that was almost spiral-shaped, with distortion of shapes but otherwise melting into the background similarly to the physiological blind spot. Normal central vision may return several minutes before the scotoma disappears from peripheral vision. It may be difficult to read and dangerous to drive a vehicle while the scotoma is present. This is a different disease from retinal migraine, which is monocular (only one eye). The visual anomaly results from abnormal functioning of portions of the occipital cortex at the back of the brain, not in the eyes nor any component thereof, such as the retinas. Others describe patterns within the arc as resembling herringbone or Widmanstätten patterns. It also can resemble the dazzle camouflage patterns used on ships in World War I. teichopsia, from Greek τεῖχος, town wall), because of its resemblance to the fortifications of a castle or fort seen from above. An arc of light may gradually enlarge, become more obvious, and may take the form of a definite zigzag pattern, sometimes called a fortification spectrum (i.e. Some describe seeing one or more shimmering arcs of white or colored flashing lights. ![]() In teichopsia, migraine sufferers see patterns in the shape of the walls of a star fort.Īs the scotoma area expands, some people perceive only a bright flickering area that obstructs normal vision, while others describe seeing various patterns.
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