The other favorite fan disability is photosensitive epilepsy, the condition associated with flashing lights causing seizures. If you listen around fan groups you'd think it was common (it isn't), a quickly blinking light sets off seizures (mostly not), and that strobing lights are the cause (it's a cyclic luminescence variation that triggers most events - so sunlight on waves, driving past a fence, or faulty florescent lights are also triggers). I wrote up an article for the OryCon 28 daily zine after hearing too many complaints about a toy from the dealers' room that blinked.

I'm sure we will hear more about PSE; it sounds exotic and interesting, yet has no symptoms most of the time and is hard to diagnose anyway.