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This condition is known as visual migraine. Migraine is thought to occur when dilation and constriction of the arteries in the head lead to an extremely painful headache. Visual migraine, on the other hand, is a condition believed to be of the same cause as of migraine but instead of the spasm affecting the surface of the brain, it affects the ocular blood supply resulting to vasospasm, a spasm of arteries behind the eye, which shuts off blood flow to the optic nerve. Visual migraine is like a temporary loss of vision associated with bright flashing lights and jagged geometric lines. It is not a blacking out of vision or a total blindness. A visual hallucination is actually a visual perception that does not involve the external stimuli.

Thus, the person’s frequent jagged geometric auras qualify as visual hallucination. More often than not, visual disturbance in visual migraine usually starts in the peripheral vision consisting of almost circular, jagged, shimmering spot which enlarges and moves to the center area which usually obscure the vision. The light is described to be of pale pastel shade. This episode disappears after 15-20 minutes and a mild headache may or may not occur.