Usually people blink their eyes once every 2-3 seconds, which means that they need to blink about 20-30 times a minute on average. The moment a person blinks, tears cover the surface of the cornea, nourishing the cornea and preventing it from drying out and causing damage to the corneal epithelium. And tears have the effect of flushing dust, or other hazardous substances, allergenic substances, to ensure the self-cleaning function of the eyes. If you don’t blink for a long time, it will cause dryness and soreness of the eyes, and will easily cause corneal epithelial damage, and may even cause corneal or conjunctival infection. If blinking is too frequent, there may be allergies or other conjunctival problems in the eyes, and you need to go to the hospital in time. If you look at electronic devices, pay attention to the appropriate blinking, so as not to make the eyes dry, but also can relieve some of the eye fatigue.