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Ooh! I just read a thing in a magazine in a doctor's waiting room today, about why they think the photic reflex happens (and it happens in 20%-33% of the population, BTW.)
The article said it's because there's a nerve, that starts with tel-something, which is responsible for sensing the light around you and closing your pupils quickly when you go from dark to light. And this nerve is right next to the nerve in the brain that triggers sneezing. They think that in photic-reflex-sneezers, the nerves are especially close, and triggering one causes the other to fire as well.
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