Not time for a long answer right now, but when people think of epilepsy, they think of flashing lights being a problem. The majority of people with seizures are not sensitive to flashing lights or are only sensitive in certain situations - like when they have been sleep deprived (purposely not allowed to sleep) which lowers the amount of stimulation it takes to trigger a seizure. Even then, it takes a certain regular frequency of lights flashing for those people to trigger a seizure. Those things are known and WDW plans attractions not to have strobe lights (those high intensity lights that seem to stop motion when they flash) and not to have flashes in the frequency that can possibly cause problems.
If your DS does not have light sensitive type of seizures, there is probably nothing he needs to avoid. Much more important, according to my DD's neurologist, is keeping medications on schedule, avoiding dehydration and avoiding sleep deprivation (someone could stay out until post midnight and then go to a park at opening the next morning, but that may not allow enough sleep time). He would want to check with his doctor, but keep in mind that formost people those things are more important than lights, especially lights that are flashing irregularly.
Also, for the Osborne Lights, they present a show with lights flashing to music, but there are also times between shows where the lights are just lit.
This turned into a long answer anyway!
If you go to the disABILITIES FAQs thread, you will find some further information about seizures and WDW. There is a link to the FAQs thread in my signature or you can find it near rhe top of this board.
