If a myopic patient is an adult, i.e. after the age of 18, and has a requirement to remove the lens, and if the myopia has been stable for the past two years, with no more than 50 degrees of growth, he or she can consider having myopia surgery, and the following tests are often required before surgery: 1. Slit lamp examination: Before myopia surgery, slit lamp examinations are routinely done to rule out lesions in the anterior segment of the eye, such as conjunctivitis and severe dry eye. 2. The eye examinations include: 1) fundus examinations: to rule out retinal pathologies, such as retinal fissures and severe retinal degeneration. 2) corneal curvature examinations: to prepare for the design of myopic surgery. 3) ultrasound examinations: to rule out important fundus diseases. 4) other examinations: each hospital may have corneal topography and A ultrasound examinations depending on the situation. 5) other examinations: each hospital may have corneal topography and A ultrasound examinations depending on the situation.