Other Positive Visual Phenomena

Phosphenes are flashes of light witnessed in patients with a blow to the eye, traction on the retina, optic nerve compression, or optic neuritis. y More complex positive visual phenomena include palinopsia (persistence of visual images), polyopia (multiple images), micropsia (shrunken images), macropsia (enlarged images), metamorphopsia (distortion of shape), and Alice-in-Wonderland syndrome (distortion of bodily image). All of these may occur during migraine aura. Metamorphopsia is a much more common complaint, however, among patients with macular disease and micropsia/macropsia among those with seizures. Palinopsia is more characteristically a symptom of occipitotemporal lobe damage.

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