1, the patient himself has the desire for surgery; 2, age 18 years or older, myopia 100-1200 degrees, farsightedness 100-600 degrees, astigmatism 600 degrees or less; 3, the refractive error in the past two years is stable, the development rate is not greater than 0, 50D per year; 4, the refractive error of the refractive error of both eyes can not be refractive reference; 5, no active eye disease, stop wearing soft contact lenses for at least 1 week; 6, eye parameters meet the requirements of surgery (need to do preoperative examination); 7, the whole body does not have the disease restricted by surgery; 8, fully understand the purpose and limitations of the operation.