Anybody else had this? It's a recognised medical phenomenon that's quite bizarre, slightly unsettling and could lead the gullible into all sorts of hysterical beliefs. In my lifetime so far it's happened just twice. And that's a long, long time. You get a little spot of scintillation appears in the visual field, both eyes, which grows and grows getting bigger, brighter and wilder. Usually in a big circle or sector of a circle with a hollow centre. Eventually it gets so big it expands out of sight and the shows over. You wouldn't want to be on the Motorway. But it's completely painless.