The pupils are worn for a long time after the eyes are godless mainly because the pupils cover, friction, resulting in inflammation and tear film loss, first of all, the quality of the pupils vary, some of the surface looks very glossy, in fact, the inner surface has a lot of unsmooth places, covering the cornea for a long time friction, will lead to damage to the corneal epithelium, stimulate the corneal edge blood vessels congestion, in the appearance of looking at the cornea is not hydrated, transparent, serious cases will cause corneal neovascularization In serious cases, corneal neovascularization can occur, causing permanent visual impairment. Secondly, the surface of the cornea is normally covered by a layer of tear film, which helps the body to see more clearly and comfortably, just like a lubricant that always keeps the eyes moist, this layer of tear film will blink with the body’s blinking action, and coat the entire exposed area of the eye, mainly the cornea, long-term coverage of contacts will lead to a lack of this layer of lubricant in the cornea, and the cornea becomes dry and godless after lack of oxygen.