Reduced intraoperative surgical risk: In fully automated microkeratome surgery, if an accident occurs, such as squeezing the eye and loosening the negative pressure ring, resulting in failure of the flap, the patient and surgeon will have to wait 1-3 months before operating again, causing great psychological stress. “In the case of similar accidents with the femtosecond laser, the doctor can put the negative pressure ring on again and replenish the laser, without interrupting the surgery. Because the femtosecond laser only produces some water and bubbles to push away the corneal tissue when creating the flap, there is no damage to the tissue, and multiple surgeries can be performed on the same affected area with greater safety. The embedded corneal flap is more accurately reset after surgery.