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It is more about signal leakage between neurones. The optical nerve is closed to the one controlling sneezing so when the optical is highly excited, it can activate the sneezing nerve.
Source : I have a friend with this and he looked it up once
TIL. I’ve heard a similar thing about certain smells being closely tied with the memory centre in the brain.
Wait what? I don’t recall doing this. Or do you mean squinting instead of actually sneezing?
No, sneezing, as in the photic sneeze reflex. If I look at the sun by accident I’ll sneeze.
