Why do we close our eyes when we sneeze?

Answer

According to Mythbusters, the eyes close just before a sneeze due to a reflex action as the eyes and the nose are connected by cranial nerves. The sneeze sends a stimulation that travels to a nerve in the brain and a nerve in the eyelids triggering the eyes to close.

According to LiveScience, sneezing is a way in which the body protects the nasal passages from foreign particles. Air is forced out of the area of the lungs, and the brain orders the muscles to contract from the esophagus all the way to the sphincter. These orders include the muscles that control the eyelids. Certain sneezes can even cause the eyes to shed tears.

1 Additional Answer
Ask.com Answer for: why do we close our eyes when we sneeze
It is unclear, but scientists theorize that we close our eyes to protect them. We may be protecting our eyes from microorganisms and particles from our sneezes.
A common myth that if you sneeze with your eyes open, your eyeballs will pop out, is not based in fact. It is possible, though difficult to resist the urge to close your eyes when you sneeze.
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