University of Liverpool Orthoptics Department chair Gail Stephenson in 1996 attended a football game where one team wore grey uniforms. She noticed it was hard to see that team’s players and realized it was because of the colour of their kit. This inspired her to conduct research in a bid to explain the phenomenon. Stephenson’s experiments with peripheral vision revealed that bright reds were usually detectable within a 120-degree field of view, whereas pale grey was detectable only inside a 40-degree field of view.