Is excimer laser surgery safe? This is a concern for every patient who is considering excimer laser surgery. I, as an ophthalmologist, should take a scientific and cautious approach to answering this question. My answer is that laser vision correction surgery is safe under strict indications, with appropriate surgical modality and design, excellent examination, surgical equipment, skilled surgical operation, and a strict post-operative follow-up system. On the contrary, if the indications for surgery are blindly expanded and people who should not have laser surgery have the surgery, then there may be greater risks. Laser vision correction surgery is prohibited or prudent when the patient has one of the following conditions: (1) active inflammatory eye lesions: acute conjunctivitis, keratitis, iridocyclitis, etc.; (2) patients with cone corneas, exposed keratopathy, extensive corneal neovascularization, moderate to severe dry eye; (3) patients with obvious scars, uncontrolled connective tissue diseases or severe autoimmune diseases; (4) patients with more obvious (5) Patients or guardians who have not signed the formal consent and notification form for the surgery; (6) Patients who are cautious about laser surgery: (1) Patients who cannot arrange for reliable postoperative management; (2) Patients with unrealistic expectations, high vision requirements, and major concerns; (3) Pregnant or breastfeeding women; (4) Patients with neurological disorders such as mental illness, obsessive-compulsive disorder, depression, or unstable mental status. (4) Patients with mental illness, obsessive-compulsive disorder, depression and other neurological disorders, and those with unstable mental status. The higher the degree of myopia corrected by excimer laser surgery, the greater the amount of cornea cut, from this point of view, the lower the degree of correction, the higher the safety of excimer laser. 300 degrees of myopia for excimer laser surgery, the risk is much lower than 1300 degrees of people. The more the cornea is cut, the thinner it is left, the greater the potential risk, such as the most feared cone corneas. So who is excimer laser surgery effective for? Excimer laser surgery falls under the category of optical corneal correction surgery (cornea is a clear layer of tissue on the surface of the black eye). It is performed by ablating part of the stroma of the cornea with an excimer laser, changing the curvature of the front surface of the clear cornea, thus changing the refractive power of the cornea and acting as an invisible contact lens, thus allowing the patient to see as clearly without glasses as with glasses. This shows that excimer laser surgery only acts as a contact lens, and does not reduce the incidence of complications that would otherwise occur with myopia. For example, in highly myopic eyes, the incidence of retinal detachment is much higher than in orthokeratology, so after excimer laser surgery, although the patient can see clearly without glasses, the incidence of retinal detachment is not reduced. Therefore, it is wrong for some patients to think that excimer laser surgery can prevent myopia from deepening and reduce the incidence of retinal detachment. In addition, excimer laser surgery can only improve bare eye vision, but not or rarely improves the patient’s best corrected vision (corrected vision is commonly understood as the vision after glasses). Some adults who have amblyopia as a child, i.e., who still have poor vision after wearing glasses, would like to improve their vision with excimer laser, which is beyond the scope of this procedure, and I should say that excimer laser surgery cannot do anything about it. From the above description, the role of excimer laser surgery is optical correction, which only improves the naked eye vision and plays the role of a pair of suitable glasses. In other words, only people who have an occupation or don’t like to wear frame glasses, and who find contact lenses troublesome, uncomfortable and inflammatory can consider excimer laser surgery. So what is the best choice of laser vision surgery? There are two types of mainstream laser vision correction surgery: femtosecond and excimer laser, which can be combined with aberration-guided and corneal topography-guided corneal cutting, so there are a variety of names, making people dazzled and unable to choose. Excimer laser is divided into what is commonly known as IK and EK, IK is short for LASIK, LASIK is the production of corneal stromal flap by micro automatic corneal knife; EK is short for LASEK, LASEK is the production of corneal epithelial flap by alcohol; after completing the production of corneal flap, the excimer laser is used to ablate the corneal stroma on the front surface, the cornea is flattened, the refractive power is reduced, the light focus After the flap is created, the excimer laser is used to ablate the corneal stroma on the anterior surface. Femtosecond laser is divided into two types: full femtosecond and semifemtosecond. The semifemtosecond laser is used to create the corneal flap and then the excimer laser is used to ablate the corneal stroma and correct the curvature of the anterior surface of the cornea. Full femtosecond is a milestone breakthrough in the history of laser vision correction, which directly sculpts a contact lens-like thick layer of lens from the corneal stroma, and manually removes this layer of lens from the 2-3mm corneal incision prefabricated by the femtosecond laser, which has the advantages of less damage, more precision, and lower regression rate, and has the tendency to replace other procedures. Each of these procedures also has its own characteristics and is suitable for different people. For example, LASEK surgery is suitable for patients with low diopters and thin corneas, full femtosecond surgery for patients with deeper diopters and normal corneal thickness, aberration-guided surgery for patients with large aberrations, etc. In short, it is important to choose the right procedure for you under the guidance of an experienced surgeon.