This reaction of your eyes hasbeen a kind of mystery for everyone. Everyone seems to have their own different theories, more complex than the other. But most fundamentally this can be explained by a simple term called reflex reaction, which means those reactions are generated, within a flash second by our bodies in coordination with our brain. Therefore it may be that our eyes stop the dust and mucus particles sneezed by our nose to enter into our eyes.

Basically sneezes can’t be stopped. Pollen or dust particles find their way up to your nose and start irritating your nasal membrane, and with this begins off a cascade of reactions. When an irritant from the environment comes into contact with your nasal mucosa, the trigeminal nerve is activated, and a signal is sent to the medulla, which is located in the lower part of the brain.

Your chest starts expanding and your lungs get filled up with air, and so you sneeze all over the place as a result. You can sneeze up to 5,000 mucus and air droplets every second at speeds of up to 100 miles per hour.