At present, China’s contact lens wearers show the characteristics of the lower age, the number of men has also increased, 50% of contact lens wearers in the use of long-period lenses, some young teenagers in pursuit of beauty, figure of convenience, through informal channels to buy poor quality colored contact lenses. Many people do not know that contact lenses belong to the third category of medical devices, not only should the dispensing unit obtain a medical device registration certificate, and the dealer should also have the appropriate sales qualifications. Contact lenses need to be fitted under the guidance of professionals, after proper optometry and eye examination to determine whether they are suitable for wear, so you should choose a professional hospital or dispensing center to fit your lenses. General lenses and care products have a specified use time, if long-term irregular wear contact lenses will cause a variety of complications caused by corneal hypoxia, and even serious corneal infection. Therefore, contact lens wearers should have regular eye exams every 3 months. If you experience eye discomfort, redness, swelling or pain, you should immediately remove your contact lenses and go to the hospital as soon as possible.