Hello, excimer laser surgery is mainly used for myopia surgery. There are three kinds of excimer laser surgery: 1. Excimer laser photorefractive keratectomy -PRK [indications] mild to moderate myopia, hyperopia and astigmatism, and meet the following conditions: 1 Age ≥20 years old (under special circumstances, it may be appropriately relaxed to ≥ 18 years old. 2. The refractive state is stable for 2 years or more (changing every year)