Image: Expanding fortification pattern-migraine with aura

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Description: Expanding fortification pattern in a migraine with aura. "Inhibitory character within angled oval of an expanding fortification spectrum. Outside the limiting line, vision is preserved; within it, vision is lost. This occurs at first over the whole area; afterwards, when the sphere is broken and has become oval, loss is most intense close to the limiting line and becomes less toward the middle."~ Gowers WR: Visual sensations in migraine. In: Subjective Sensations of Sight and Sound: Abiotrophy and Other Lectures. London: Churchill, 1907
Title: Expanding fortification pattern-migraine with aura
Credit: http://www.oculist.net/downaton502/prof/ebook/duanes/pages/v2/ch016/007f.html
Author: Sir William Richard Gowers
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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