Abstract
This paper outlines the historical development of the concept of the visual aura of migraine, from the first comprehensive published description by the physician Hubert Airy, in 1870. Airy's description of the phenomenon he called "transient hemiopsia" became widely copied and highly influential as a consequence of the language and images that he used in his presentation. This paper outlines the subsequent development of theories of aura from the time of Airy's publication to the first demonstration of spreading oligaemia by Lautitzen and Olesen in the 1980s.