Contact lenses themselves are equivalent to a foreign body, so a mild foreign body sensation will occur when covering the surface of the cornea, which is a very normal phenomenon. If the symptoms do not improve after a long period of time, or if there is a sudden onset of foreign body sensation, there may be local complications, such as conjunctivitis, keratitis or damage to the corneal epithelium caused by wearing contact lenses, which may lead to a significant foreign body sensation in the eyes. Therefore, it is important to go to the hospital as soon as possible to have the condition checked, and if there are complications, contact lens wear should be suspended, and symptomatic treatment should be given for the specific condition. If there is local inflammation such as conjunctivitis, anti-inflammatory treatment should be given, and if there is corneal damage, corneal repair treatment should be given. Since contact lenses are in long-term contact with the conjunctiva and cornea, they are likely to cause complications if worn incorrectly, so it is important to pay attention to the correct wearing method.