Headache
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To assess visual perception in 40 patients suffering from migraine with aura (MA), 40 patients suffering from migraine without aura (MO), and 40 controls. ⋯ The impairment in visual perception of red, which was more marked in MA than in MO patients, may be related to the degree of photophobia recorded before testing. The reduced perception of blue, which only occurred in a subgroup of MO patients in the premonitory phase of the migraine attack, probably occurs through mechanisms that involve dopaminergic function. We cannot exclude the possibility that the visual stimulations induced the migraine attack in this subgroup of MO patients shortly after they were tested.