Have you ever noticed that when you sneeze, your eyes automatically close?
It takes a great effort to keep them open during a sneeze, which you know if you have ever sneezed while driving.
Why is that?
The body's blinking response is likely there to protect itself from germs entering the eyes, according David Huston, M.D., an allergist at Houston Methodist Hospital and an associate dean of the Texas A&M College of Medicine.
While it is "absolutely possible" to sneeze without closing your eyes, Huston says that closing your eyes is an autonomic reflex, which is an unconscious motor action in response to a stimulus: in this case, sneezing.
"The fact that it is possible to sneeze with the eyes open suggests that it is not hard-wired or mandatory," Huston says. There is not definitive data as to why sneezing elicits a blinking response, but Huston and others speculate that it is reflective of a protective mechanism.
"The body works to rid its airways by sneezing when it detects irritating particles in the nose," Huston explains. "By automatically shutting the eyelids when a sneeze occurs, more irritants can potentially be prevented from entering and aggravating the eyes."
Some may nervously recall the age-old myth that warned against sneezing with open eyes to mitigate the possibility of their eyeballs popping out. Tales swirled for decades speculating that subluxation, or dislocation of the eyeball, could occur if people sneezed with their eyes open. Many point to a story published on April 30, 1882 in The New York Times that reported an incident of a woman whose eyeball became unhinged from aggressively sneezing. The article told of a woman who "met with a singular accident day before yesterday. While riding on a street car, she was seized with a sudden fit of sneezing and burst one of her eyeballs, from which she has since been suffering the most intense pain."
However, the rumors that open-eye sneezes dislocate eyeballs were based on conjuncture. In fact, Huston dubs such stories as far-fetched tales. "There is little to no evidence to substantiate such claims," he insists. "Pressure released from a sneeze is extremely unlikely to cause an eyeball to pop out even if your eyes are open."
Increased pressure from straining builds up in the blood vessels, not the eyes or muscles surrounding the eyes. This vascular pressure can result in ruptured capillaries, which are the body's smallest blood vessels, that often manifest in the eyeballs or the face.
"For example, during childbirth, excessive straining can cause some veins to hemorrhage, leaving a mother's eyes or face to appear red or markedly bruised," Huston said, "but it is irresponsible to claim that such pressure could dislodge the eye from its socket."
--From the Editors at Netscape