Try to keep your eyes open when you sneeze

“If you don’t close you’re eyes when you sneeze, you’ll pop out an eyeball!” It’s what the kids on the playground always said, right?

And like much of the information crowdsourced from your friends when you were 7, it’s not exactly true.

Closing your eyes when you sneeze is a reflex — a rapid and involuntary response to a stimulus, the stimulus in this case being signals from the brain to the nose saying, “SNEEZE!!” But like yawning, we don’t know for sure what it’s for.

The one thing it’s not for is keeping your eyes in your head while sneezing. For starters, your eyes are anchored to your skull by the six extraocular muscles, the ones that let you move your eyes around.

And it’s not like your eyelids are adding much structural support when you sneeze. The muscles that move your eyelids have one job — to move your eyelids. They wouldn’t have the strength to keep your peepers in place should the extraoculars tear and enough pressure were to build up in your eye sockets to make things go pop.

Which it wouldn’t in the first place, because your orbits are separated from your nasal passage, which is where sneezes start,by bone and membranes. Pressure building up in your nose doesn’t transfer into your eye sockets.

Lateral orbit nerves.jpg by Patrick J. Lynch on Wikimedia Commons. Used under Creative Commons license. http://en.wikipedia.org/wiki/File:Lateral_orbit_nerves.jpg

Look at all those muscles! (Patrick J. Lynch/Wikimedia Commons)

So why is it then that when the sneeze is coming that your eyes snap shut like a crocodile nabbing a snack? I hate to say it, but it’s that we don’t really know.

Is it to keep stuff from flying into your eyes when you sneeze? Well, when you sneeze, you’re expelling air, mucus, and other stuff from your face at about 100 miles per hour (though in a study published this year in the journal PLoS One, the fastest sneeze by a group of volunteers clocked in at a measly 10 mph).

Sneeze by Brian Judd and the US Centers for Disease Control and Prevention, via Wikipedia. http://phil.cdc.gov/phil/details.asp?pid=11162

See, nowhere near your eyes. (Brian Judd/CDC/Wikimedia Commons)

According a 2004 article on Boston.com:

”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,” said Dr. Bonnie Henderson, director of comprehensive ophthalmology at the Massachusetts Eye and Ear Infirmary.

But it may also be as simple as a wiring mixup. You don’t just sneeze with your head…you sneeze with your whole body. There are lots of nerve signals and muscle contractions going on all over the place when you sneeze, and your eyelids may just be getting caught up in the act.

Regardless of the reason — or lack thereof — it’s a tough reflex to counteract, as Mythbusters’ Adam Savage discovered when he tried:

So sneeze on, and remember, we may not know why you close your eyes, but they’re not going anywhere. Just please cover your mouth and nose, ok?

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s