To undergo myopic surgery, it is generally necessary to meet the conditions of age 18 or above, no eye diseases, sufficient corneal thickness and stable refractive error. 1. Above 18 years of age: The eyeballs of minors are still growing and developing, and myopia is still developing, so even if they undergo the surgery, myopia may reappear later, so it is generally recommended that they undergo myopia surgery after they reach 18 years of age. 2. No eye disease: patients with acute conjunctivitis, glaucoma, severe dry eye and other eye diseases, generally can not do myopic surgery, such as acute conjunctivitis patients, myopic surgery before the condition is not cured, may cause corneal infection and other complications. 3. Sufficient corneal thickness: Under normal circumstances, corneal thickness is usually required to be more than 460 microns for myopic surgery. Generally speaking, the higher the myopia, the thinner the corneal thickness. If the cornea is too thin and then myopic surgery is performed, complications such as cone cornea may be induced. 4. Stable refractive error: Myopia surgery requires that the myopia does not exceed 1000 degrees, the astigmatism does not exceed 600 degrees, and the refractive error is stable, generally speaking, the increase or decrease of the refractive error does not exceed 50 degrees per year. If patients need to have myopia surgery to correct their vision, it is recommended to consult with a professional doctor in detail to meet the surgical conditions before undergoing the surgery, so as to avoid adverse consequences.