Monthly disposable contact lenses are not recommended to be used again after one month of use, because the service life of monthly disposable contact lenses is only one month, long time use will lead to a large number of bacteria on the surface of the glasses, and the material, oxygen permeability, water content of monthly disposable contact lenses have changed, after the expiration date of use is likely to cause toxic conjunctivitis, corneal epithelial damage, infectious keratitis and other eye diseases, eye redness, swelling, itching, dryness and other symptoms. The eye will become red, itchy, dry and other symptoms, and in serious cases, may damage vision. When wearing monthly contact lenses, you should pay attention to their expiration date and replace them in time to avoid damage to your eyes. Monthly contact lenses also need to be cleaned regularly, because tears contain proteins, and monthly contact lenses can become rough due to protein accumulation during use, which can easily rub the cornea and cause infection. You should also avoid rubbing your eyes when wearing monthly contact lenses to avoid wrinkling the lenses and causing a strong foreign body sensation in your eyes. Monthly contact lenses should not be worn for more than eight hours a day, not to mention all night, so as not to leave the cornea in a state of oxygen deprivation for a long time. If myopia is serious, you can also go to the hospital for laser surgery, which can effectively relieve myopia symptoms.