Argh, yes, I can imagine that migraines are a danger if you're prone to them - seizures too, I'd guess. Seriously, the more I find out about the problems people have with this technology, the less I understand how any cinema can ever only offer 2D. It can't possibly bring profits up, can it? For every 2D-fan who is coerced into 3D by the lack of choice, there must be at least one other cinema-goer who stays away entirely.