Sneezing, the face of hundreds of pieces of muscle will be effectively relaxed, while the eyes will be instinctively closed. Eyes open to sneeze will be the eyes of the card is just flying cartoon film, if you can really open eyes sneeze, it is beneficial and harmless.
On the one hand, when sneezing with a lot of power to expel the gas, lung, mouth, nasal cavity have a lot of pressure, not only the diaphragm and intercostal muscle and other respiratory muscles to sudden severe contraction , neck, The amount of muscle should be nervous, then dominate the eyes of the orbicularis oculi muscle will shrink, because it is with facial muscles with facial nerve , so they can not help but close your eyes. On the other hand, sneezing when the nervous system to a high concentration of energy to complete a series of sneezing reflex, close your eyes, can reduce the external interference, and sometimes want to sneeze, happened to talk to you or shoot you, May sneeze can not hit out.
Sneezing with a lot of power to exhaust gas, lung, mouth, nasal cavity has a lot of pressure, this pressure can make the air flow to 160 km / h speed, can be sprayed outside the three or four meters The If you open your eyes with sneezing, sneezing pressure is likely to seriously hurt the lacrimal duct duct, and even the optic nerve by trauma.
So, in order to protect the fragile eyes, in the long process of evolution, our brain to form this instinctive reaction.
