A visual migraine aura occurring in isolation is called an 'acephalgic migraine
.' Migraine auras vary from individual to individual--although teichopsia (zig-zag lines akin to castle battlements; see Figure 3) are thought of as being the classic migraine aura, a much wider array of symptoms may occur, including reports of 'small bright dots,' 'coloured spots of light,' along with hemianopia, scotomas, blurred vision and distortions such as 'mosaic' fractured vision or a 'heat wave' appearance.
The condition, also called acephalgic migraine
or migraine aura without headache, tends to occur more frequently as people get older.
Familial acephalgic migraine. Neurology 1995; 45: 2293-4.
The VEP in acephalgic migraine. Headache 1990; 30:285-8.
Benign recurrent transient monocular blindness: a possible variant of acephalgic migraine. Headache 1987; 27: 66-9.
Familial acephalgic migraines. Neurology 1997; 48: 776-7.
Patients with acephalgic migraine (migraine aura without headache) may represent as many as 3% of migraineurs.
The terms acephalgic migraine or migraine equivalents have been replaced within the Classification and Diagnostic Criteria for Headache Disorders, Cranial Neuralgias and Facial Pain by the Headache Classification Committee of the International Headache Society.
While acephalgic migraine would fall into the category of migraine aura without headache, episodes of migraine aura without headache can occur in individuals with a history of classic migraine.