I *am* a doctor, although I don't work with seizures extensively.  (Usual 
disclaimer, this is for general information only, talk to your own doctor if 
you're trying to apply this to a specific clinical situation, etc etc)

Photosensitive epilepsy is probably about a hundred thousand people total in 
the US or so.  Many people with epilepsy do not have any such trigger.  
Probably unlikely to run into such an individual by chance since it's, what, 
about .03% of the population?

The frequency that triggers it varies depending on the individual, but 5-30 Hz 
(flashes/second) is the most common seen.

http://www.epilepsyfoundation.org/aboutepilepsy/seizures/photosensitivity/index.cfm
 has a decent summary.

I suspect this is one of those triggers that is more commonly known about 
because of the Japan incident (which involved broadcast media, so it affected 
many people across a population) but is fairly rare.

Peace and Prosperity,
Dipesh 
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