The keratoplasty lens is OK lens, which may cause symptoms such as foreign body sensation, eye redness, eye pain, photophobia and blurred vision after wearing. Because of the direct contact with the cornea, may produce corneal changes, such as corneal epithelial detachment and erosion, long-term wear may appear corneal neovascularization, endothelial cell morphology abnormal, without attention to personal hand and eye hygiene can occur infectious keratitis. Most of these corneal hazards are relatively minor and have a good prognosis, but very few can affect vision. They are mainly related to inappropriate selection of indications, improper fitting of lenses, lens contamination, lack of proper personal hygiene or poor health status.