Sleep with contact lens is very bad. It will increase the risk of severe eye infection. Therefore, if you go to sleep, you should take off your contact lenses. Eyes need constant metabolism, it will constantly secrete proteins and other substances, these substances will be attached to the lens, which will reduce the oxygen permeability and the comfort of the lenses, at ordinary times, we can blink to alleviate this situation, but no matter you go to sleep or have a nap, when you weak up, the comfort of the lens will decrease. In addition, cornea needs oxygen, when you open your eyes, the cornea can absorb oxygen from air, but when you close your eyes, the blood vessels under the eyelids is responsible for the supply of oxygen, so when you wear lens when you sleep, it will reduce oxygen absorption. So do not wear contact lenses when you sleep.
