The most common types of myopia surgery are keratoconus and intraocular refractive surgery, which may vary in terms of optimal age and the range of diopters that can be corrected. 1. Keratoconus: laser cutting of the corneal stroma to change the radius of curvature of the cornea to correct the refractive error. The upper limit of myopia that can be corrected is around 1,000 diopters, and the age of surgery is recommended to be above 18 years old. 2. Intraocular Refractive Surgery: The most common type of intraocular refractive surgery is IOL implantation, which can correct myopia up to about 2,000 diopters, and is suitable for patients with high myopia who cannot undergo corneal refractive surgery. The age of surgery is also recommended to be within 18 to 45 years of age, with stable myopia that has not yet developed presbyopia, so as to achieve the goal of lens removal. Myopic surgery not only requires age and degree of myopia, but also requires a variety of pre-operative examinations to fulfill the conditions for surgery. Patients are advised to go to regular hospitals and under the guidance of experienced doctors to undergo the surgery.