It is nearly impossible to keep your eyes open while sneezing due to an involuntary reflex.

The act of sneezing, known as sternutation, is controlled by the medulla oblongata in the brainstem. When irritants stimulate the trigeminal nerve, the sneeze center triggers a coordinated contraction of various muscle groups. This includes the extraocular muscles and the orbicularis oculi, which are responsible for closing the eyelids.Research indicates that this reflex is a protective mechanism. By closing the eyes, the body prevents the high-pressure air and expelled particles from irritating the ocular surface. A sneeze can travel at speeds of up to 100 miles per hour, creating significant internal pressure that the body must manage.While a popular urban legend suggests that eyes might pop out if kept open, this is anatomically impossible. The eyes are securely held by six extraocular muscles and the optic nerve. There is no physical connection between the nasal passages and the eye sockets that would allow such a pressure buildup.Despite being an involuntary reflex, a very small percentage of people can trained themselves to keep their eyes open. However, for the vast majority of the population, the autonomic nervous system ensures the eyelids snap shut before the air is released. This synchronization ensures that the respiratory system and facial muscles work in perfect harmony.