Full femtosecond surgery is an advanced method of corneal refractive surgery that can be used to correct myopia. This surgical procedure not only requires the patient’s age and degree, but also takes into account the stability of the degree, whether to wear corneal contact lenses, corneal thickness and other conditions. The decision to perform the surgery is based on the preoperative eye examination and basic examination results.1. Patient age: Full femtosecond surgery generally requires patients to be between the ages of 18 and 55 years old, with either too high or too low an age to perform the surgery. However, this age range is not absolute, but also need to consider other factors; 2, degree size: full femtosecond surgery on myopia, farsightedness, astigmatism are required, myopia need to be 150-1600 degrees, farsightedness need to be 100-600 degrees, astigmatism need to be in 100-600 degrees. If you want to do full femtosecond myopia surgery, you need to meet the above requirements for myopia and astigmatism; 3. Degree stability: If there are fluctuations in the degree of myopia, the surgery cannot be performed. If the eye has been changing, you need to wait for the degree stability time to reach about 2 years before surgery; 4, whether to wear corneal contact lenses: If you wear corneal contact lenses, soft lenses to stop wearing 1-2 weeks, hard lenses to stop wearing 2-3 weeks, then according to the recovery of corneal morphology, thickness, etc. to decide whether to operate; 5, corneal thickness: corneal thickness greater than 450μm patients to carry out Surgery, if the corneal thickness is lower than 450μm, then full femtosecond surgery is generally not considered. If all conditions are met, you can stop wearing corneal contact lenses 10 days before surgery and start using antibiotic eye drops 4 days before surgery to reduce the risk of postoperative infection. Ensure that you get enough sleep 1 day before surgery. Do not use eye cosmetics during the period from the time you are determined to be ready for surgery to the time before surgery to facilitate better cooperation with the surgeon during surgery.