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It's a common observation that our eyelids instinctively snap shut during a sneeze, leading many to believe it's an unavoidable action. This automatic closure is indeed an involuntary reflex, an unconscious motor action triggered by the brainstem in response to irritants in the nasal passages. This reflex is a coordinated effort involving multiple muscles throughout the body, with eyelid closure being one component of this rapid chain reaction.
The primary reason for this reflex is thought to be protective. When you sneeze, your body forcefully expels air and potentially irritating particles, sometimes at speeds reaching up to 100 miles per hour. Closing the eyes acts as a temporary barrier, shielding these delicate organs from the expelled germs, bacteria, and debris, preventing them from entering and aggravating the eyes. Some medical professionals, like Dr. David Huston from the Texas A&M College of Medicine, suggest it's simply an involuntary reaction, similar to a knee-jerk reflex, without a definitive, complex purpose.
Despite the strong reflex, it is "absolutely possible" to sneeze with your eyes open, though it requires conscious effort to override the natural impulse. The persistent myth that eyeballs will pop out if you manage to keep them open is entirely unfounded. Your eyeballs are securely held in their sockets by six extraocular muscles and connective tissue, making dislocation "almost impossible". The pressure generated during a sneeze is distributed across various areas and is not sufficient to dislodge an eye.
While the dramatic sensation of a powerful sneeze might make exaggerated stories seem plausible, there's little to no scientific evidence to support claims of eyeballs popping out. An often-cited 1882 New York Times article reported a woman who allegedly "burst one of her eyeballs" from sneezing, but medical experts consider such tales as "far-fetched" and highly unlikely to be true. The reflex to close our eyes is a built-in defense mechanism, but defying it, while challenging, carries no risk of ocular expulsion.