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It is unclear, but scientists theorize that sneezing causes the eyes to close due a systemic reflex. This reflex causes muscles throughout the body to contract involuntarily.
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.

www.nbcnews.com/health/body-odd/eye-popping-truth-about-why-we-close-our-eyes-when-f1C9321739

Apr 12, 2013 ... We all know how a sneeze happens. What we don't know is why our eyes automatically close when we do it. School kids will tell you it's ...

www.livescience.com/32108-why-do-my-eyes-close-when-i-sneeze.html

Dec 22, 2016 ... Why is it that we almost always close our eyes when we sneeze?

mentalfloss.com/article/86279/why-do-we-close-our-eyes-when-we-sneeze

The anatomy of a sneeze is pretty disgusting. For someone with a cold, allergies, or just a tickle in the nose, it takes less than a second to eject about 5000 ...

science.howstuffworks.com/science-vs-myth/everyday-myths/sneeze-with-eyes-open2.htm

Some people's eyes don't shut when they sneeze, but most people's do. So if there's no concern that our eyes will pop out of our heads, then why do they close  ...

www.bbc.com/future/story/20131129-why-our-eyes-close-when-we-sneeze

Nov 30, 2013 ... It's actually one of science's big mysteries, but Greg Foot explains what a sneeze is and why your eyelids shut down in response.

.ask.com/youtube?q=Why+Do+We+Close+Our+Eyes+When+We+Sneeze%3F&v=XJRDRHEKY7M
Nov 25, 2013 ... Feel a bit of man flu coming on? Are your eyes watery, sneezing like crazy and getting no sympathy at all? Well poor you! We feel your pain.
.ask.com/youtube?q=Why+Do+We+Close+Our+Eyes+When+We+Sneeze%3F&v=xB-MkenBO1k
Jan 9, 2017 ... A monthly show where we endeavor to answer one of your big questions. This week, Hajera Fatima asks, “Why do we close our eyes when we ...

www.discovery.com/tv-shows/mythbusters/mythbusters-database/sneezing-eyeballs-pop-out

Apr 11, 2012 ... Can sneezing with your eyes open make your eyeballs pop out? ... So why do eyelids snap shut when a sneeze comes on, as if they're guarding the gate? ... Now that your eyes are open, too, you can see right through this myth. ... open naturally, nothing happens, I rarely close eyes while sneezing TRUE!

biology.stackexchange.com/questions/37436/why-do-we-close-our-eyes-while-sneezing?rq=1

Google says germs may fall on eyes from our sneeze but it happens ... Mythbusters did this one! The simplest response is that your eyes close as ...