Contact lenses are not like frame glasses, when you are tired you can always take them off and let your eyes rest, because contact lenses are relatively troublesome to wear, so there are many people who are afraid of trouble will wear contact lenses all day long, whether it is work or a lunchtime nap, they have been wearing them, in fact, this is not right, because long-term wear contact lenses will cause a lot of harm to the eyes, the following is the number of long-term wear The 7 hazards of contact lenses. A, eye resistance decline contact lenses will make the cornea can not contact the air, the eyes will be a lack of oxygen and similar to the human body “plateau reaction” situation, can not be normal metabolism, resistance to decline. Second, lead to visual fatigue, dry eye syndrome long wearing contact lenses, easy to produce visual fatigue, and even trigger dry eye syndrome. This leads to itchy eyes, foreign body sensation, multiple eye stools, dryness, burning eyes and blurred vision. Contact lenses adsorb proteins, lipids and collagen from tears and deposit them on the surface of the lens, breeding germs and causing corneal edema, corneal neovascularization and allergic reactions. Fourth, wear the cornea, can not receive orthodontic contact lenses wear the cornea, may cause serious consequences of corneal epithelial detachment or perforation. Some contact lens concavity and corneal convexity do not match, irregular wear corneal, causing corneal ulcers, resulting in irreversible vision loss, even after treatment will leave white spots on the cornea. Fifth, causing ocular nerve paralysis Contact lenses attached to the eye for a long time will paralyze the nerve endings, leading to corneal hyperalgesia. Many patients have ulcerative keratitis and are unaware of it. If you start wearing soft contact lenses at the age of 20, after 10 years, the corneal endothelial cell density is equivalent to that of a 60-year-old, and will not be able to withstand any eye surgery, even if cataracts occur in old age. Seven, myopia deepens, affecting the image Contact lenses are difficult to obtain and myopia very consistent with the number of refractive error, resulting in the degree of deepening year by year, more than 600 degrees of high myopia most eyes bulging, dull eyes, affecting the image.