Why do I sneeze when I look at a light?

pollen-allergies-sneeze-600Ever noticed how some people sneeze every time they walk outside? I notice it in kids with sensitive eyes all the time. A sneeze is usually caused by irritation in the nose from dust, pollen, or some other irritant. This irritation is sensed by the trigeminal nerve in the brain. The trigeminal nerve is located very close to the optic nerve, the nerve that transmits what you’re seeing to the brain for interpretation. So when the optic nerve is suddenly hit by the perception of very bright light, the stimulation can carry over to its neighboring nerve, the trigeminal nerve, causing you to sneeze. Gazunheit!

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