Please forgive a switch to a slightly different photic reflex. A friend who owned a Piper Cub
aircraft took up a student, who attempted to land heading toward the setting sun. He
had an epileptic seizure, and only prompt administration of Bulgarian anaesthesia using the
fire extinguisher enabled my friend to regain control of the plane and land safely. The student
later told him that flickering lights such a sun through the propeller could cause him to have
a seizure. I had never heard of it, and was tempted to think it was nonsense. But I found out
that it is a recognized entity. Here's
a URL:http://www.epilepsy.org.uk/info/photofrm.html