Corneal curvature is the physical name used in ophthalmology, and curvature is the reciprocal of radius. As far as a circle is concerned, the smaller the radius of the circle, the greater the curvature of the arc with the same length. The radius of curvature of the cornea refers to the curve of the corneal surface. The average radius of curvature of cornea is 7.5 mm, and the smaller the radius of curvature, the greater the curvature of cornea. The high corneal curvature means that your cornea is prominent, the axial length is longer than that of ordinary people, and the degree of myopia is relatively large. If it is too high, there may be keratoconus. The middle will become more and more prominent and thinner. Myopia surgery is done in the center of the cornea. If the center of cornea is too thin, it is not safe. Generally, keratoconus will be ruled out after 47 days. Wearing contact lenses will affect the corneal curvature to some extent, because contact lenses are in direct contact with the corneal surface. Wearing contact lenses for a long time or continuously will make the cornea in a state of continuous hypoxia, causing corneal epithelial edema and erosion. If bacteria or viruses exist, it may lead to keratitis and even corneal ulcer. Therefore, we believe that wearing contact lenses for a long time will cause excessive bending of the eyes. So, can't you do myopia surgery with contact lenses? Generally speaking, after stopping using contact lenses for a period of time, the cornea will gradually return to its original shape. However, if the contact lens worn at that time is incorrect and the time is long, it will cause corneal distortion and even promote the aggravation of myopia. In this way, it takes a long time to restore the shape of the cornea after stopping wearing. Before myopia surgery, it is necessary to do a detailed preoperative examination to determine whether the corneal morphology is normal. It is proved that myopia surgery can be done through preoperative examination.