Migraine
Silent migraine

Sometimes, aura occurs without a subsequent headache. This is known in modern classification as a typical aura without headache, or acephalgic migraine in previous classification, or commonly as a silent migraine. However, silent migraine can still produce debilitating symptoms, with visual disturbance, vision loss in half of both eyes, alterations in color perception, and other sensory problems, like sensitivity to light, sound, and odors. It can last from 15 to 30 minutes, usually no longer than 60 minutes, and it can recur or appear as an isolated event.
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