Introduction
A visual aura that appears as sparkling, shining, zigzag lines in the central visual field. This aura is believed to originate from the visual cortex. It is a diagnostic sign that the patient is suffering from a migraine. It was first described by 19th-century physician Hubert Airy (1838–1903).
It may precede a migraine headache but can also occur without headache. It typically affects both eyes.
It begins as a spot of flickering light near or in the center of the visual field and then gradually expands outward. This visual aura is because of abnormal functioning of portions of the occipital cortex of brain and not in eye or any of the components of eye.
The symptoms appear gradually over 5 to 20 minutes and for most of the cases last less than an hour succeeded by headache or resolve without headache Typically it resolves spontaneously, leaving no subsequent symptoms. In some cases, people complain of fatigue, nausea, and dizziness as a sequel.
