1. The safety of creating corneal flaps is much higher. Femtosecond flap making is virtually free of the serious complications associated with corneal flaps. Even if negative pressure is lost during flap making, the femtosecond laser can still use the original parameters and recreate the flap after the negative pressure is restored, without the patient having to wait months to do it again. 2. The flap thickness produced is highly homogeneous, precise and repeatable. “Uniformity”: uniformity of flap thickness for better vision after surgery. “Accuracy”: The actual thickness of the flap made with the femtosecond laser is very close to the pre-set corneal thickness. “Repeatability”: The actual flap thickness obtained with the femtosecond laser is very close to the preset value, with minimal fluctuations, and is very repeatable. The femtosecond laser allows the surgeon to completely personalize the flap parameters, including flap thickness, diameter, flap shape, flap tip position and width, angle of incision, etc., to truly achieve “personalized surgery”. The higher-order aberrations introduced by using femtosecond laser flap making are significantly less than those produced by mechanical corneal lamellar knife flap making. The embedded occlusion and flap restoration are more accurate. 5.The damage to the superficial corneal nerve plexus is smaller, thus reducing the occurrence of dry eye symptoms after surgery. 6.Knife-free surgery, greatly reducing the medical source of infection. 7, compared with the corneal laminate knife, due to its advantages in accuracy and safety, the scope of adaptation is further expanded to also include the following special cases: higher refraction; thin cornea (it is expected that after mechanical laminate knife flap making, the corneal stromal bed thickness cannot be retained within the safe value after laser cutting); people with small or large corneas; people with steep or flat corneal curvature; people who are interested in Patients with a fear of “blades” or “flaps”; those who need more individualized parameters.