In fact, blinking is a physiological nerve reflex only found in higher animals, among which human beings are the most developed. It has two main functions. The first is to wipe away tears and let them give full play to the role of eye protection. You may think that people only cry when they cry or their eyes are stimulated, but in fact, the lacrimal gland keeps secreting tears, but it usually secretes less, which is not easy for us to notice. Blinking can make tears evenly distributed on the cornea and conjunctiva in front of the eyeball, keeping these parts moist. The cornea must always be soaked in tears, otherwise it will become dry and turbid, making people unable to see clearly and even lead to blindness. Tears can also clean the eyeball and protect it from dust and bacteria in the air. Secondly, blinking is to regulate the activities of retina and extraocular muscles. These two parts can only rest when sleeping or blinking. If they always keep their eyes open, they will be overworked, which is not good for the health of their eyes.
To sum up, why do people blink? The answer is simple-protect your eyes.