I can’t give you an ELI5 answer, however it’s called [Photic sneeze reflex](https://en.wikipedia.org/wiki/Photic_sneeze_reflex).
Personally I think that – to make it ELI5 – the “wires” from the eyes to the brain run next to the “wires” from the nose, and that they have bad shielding, so that when a very strong signal runs through one set of wires, it can leak into the other set of wires.
Nobody knows the exact mechanism, but this isn’t actually a universal experience. Many people don’t have this response.
Most leading theories relate to the optic nerve. The fact that it is close to most of the nerves in your nose leads scientists to believe that stimulus in the eyes can result in a slight response in those nerves related to the nose as well.
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