Femtosecond laser is a laser that emits in pulses lasting only a few femtoseconds (1 femtosecond = one trillionth of a second), the shortest pulse available to man under experimental conditions. The femtosecond laser is used in eye surgery and has been hailed as “a revolution in refractive surgery”. The procedure is as follows: 1. Anesthesia of the eye: At the beginning of the procedure, surface anesthetic eye drops are administered. 2. Eyelid opener and suction ring: The eyelid opener helps the patient to open the eye during the entire laser myopia surgery. The surgeon then fits the propped-up eye with a negative pressure suction ring to hold the eye in place. 3.Corneal flap making: A thin layer of cornea cut by a scalpel or laser. There are also surgical procedures that do not require flap making: for example, the SMILE procedure. 4.Laser sculpting: After the flap is made, the flap is lifted, and the laser is used to cut and sculpt the cornea according to the pre-entered laser surgery parameters (according to each patient’s pre-operative examination data). 5. Reset the corneal flap: the surgery is completed. The above is the approximate process of femtosecond laser myopia surgery, which may vary slightly depending on the procedure. Laser myopia surgery sequelae Laser surgery is a relatively mature and safe surgery to correct refractive errors (myopia, hyperopia, astigmatism), and the probability of sequelae is very small if you strictly grasp the indications and do the preoperative and postoperative things. If the sequelae of the surgery appear, there may be the following situations: 1, dry eye: this is the relatively most occurring situation, especially in the early postoperative period; 2, keratitis: such as bacterial conjunctivitis, viral keratitis, etc.; 3, vision regression: myopia, hyperopia, astigmatism, etc. may appear again; 4, postoperative corneal flap misalignment caused by accidental collision: this will not occur in the surgery without corneal flap; 5, the Cone-shaped cornea: excessive corneal chipping leads to too thin corneas after surgery. Therefore, the following points should be noted after surgery: 1, you need to insist on regular review after surgery; 2, do not use eye cosmetics within two weeks; 3, moderate eye use within three months, do not do eye massage, do not let dirty water into the eye when washing face and hair, do not violently rub the eye, and it is best to wear sunglasses when going out in summer. 4. Do less strenuous sports and avoid impact on the eye. Try to avoid the appearance of sequelae.