With the continuous development of technology and improvement of medical standards, myopia correction surgery has also developed rapidly, starting from the 1980s, the development of myopia correction surgery has gone through four stages in the past 20 years: the pioneering period, the popularization period, the enhancement period and the cutting-edge safety period. From the “originator” of myopia surgery, RK (radial keratotomy), to the latest generation of femtosecond laser myopia surgery, both from the improvement of the treatment equipment, the innovation of the surgical method, the experience of the surgeon and the safety of the surgery are not what they used to be. I. Improvements in surgery: achieving “no knife” and “minimally invasive” 1. From the earliest RK, ALK with a blade cutting cornea to the 1990s laser refractive keratomileusis PRK, LASIK, to the emergence of femtosecond laser, both surgical methods and treatment concepts, have taken a qualitative leap. Traditional myopia surgery relies on a mechanical knife (lamellar blade) to create a corneal flap and then a laser beam to irradiate the corneal stroma to precisely ablate the cornea and improve the refractive power of the cornea. Femtosecond laser surgery does not use a lamellar blade to cut the cornea, but is a computer-controlled all-laser procedure that is completely “blade-free”. Compared to the mechanical corneal laminate knife used in traditional surgery, the femtosecond laser is able to create a very precise flap thickness that is more than 100 times more accurate than the traditional corneal knife, allowing for more accurate cutting and thinner flaps. Because the laser myopia correction flap cuts at a uniform depth and damages fewer nerves and blood vessels, the use of the femtosecond laser also greatly reduces the incidence of post-LASIK dry eye, which makes myopia surgery safer and virtually eliminates the possibility of complications due to the use of a handheld keratome. This, coupled with the fact that femtosecond laser for myopia is an all-laser procedure, completely eliminates the possibility of cross-contamination. Femtosecond lasers can be used not only to simply create the corneal flap needed for excimer laser lamellar surgery, but also for refractive correction. Currently, most femtosecond lasers can only be used for flap making, but only the Zeiss “full femtosecond” laser can combine flap making and laser cutting into one. 2, from “invasive” to “minimally invasive” Although the classical surgical method of making corneal flap and excimer laser ablation of refractive error has been very mature, but the existence of corneal flap is always the drawback of this surgical method, which destroys the integrity of the physiological structure of the cornea and weakens the biomechanics of the cornea. It disrupts the physiological integrity of the cornea, weakens the biomechanics of the cornea, and can easily cause flap dislocation after trauma. “This procedure is called microincision stromal lens excision (SMILE, or “smile surgery”), in which the femtosecond laser performs two separate scans of the corneal lamina at different depths to complete a complete The surgeon then uses special instruments to follow the micro-incision to separate and remove the femtosecond-formed lens-like tissue. This procedure is minimally invasive and does not involve corneal flap making or flap lifting, avoiding the risk of corneal flap complications, minimizing damage to the corneal physiology, and obtaining better visual results. Since the integrity of the corneal nerve is preserved, the occurrence of postoperative dry eye is also avoided. It is especially suitable for people who are vulnerable to trauma, such as the military and athletes. ”Full Femtosecond” laser surgery is one of the most advanced modes of keratoconus surgery in the world, which brings the safety and precision of myopia correction to a new level. Due to the high development cost and difficult to break through the technical bottleneck, only the German Zeiss “full femtosecond” laser can be used in the “full femtosecond” myopia correction surgery. Second, the improvement of the treatment equipment: the whole visual control of intraoperative safety 1, equipment upgrades, computer software development Since the 1990s, the first LASIK surgery landed in mainland China, to the 2006 femtosecond laser market, experienced extensive development and rigorous clinical trials of myopia correction equipment has undergone a qualitative metamorphosis. Once upon a time, the mechanical keratome was used to make the flap, requiring both hands and feet to operate the blade head steadily and the foot pedal to control the negative pressure pump accurately. The femtosecond laser flap is a computer-controlled process that frees the surgeon’s hands and feet, just like a step from the slash-and-burn era into the electronic era, elevating safety to an unprecedented level. Secondly, from the computer-controlled excimer laser corneal shaping software, the increasingly perfect corneal shaping procedure makes us believe that in the near future, excimer laser can do any shape reshaping on the cornea, and then achieve the correction of higher refractive error to obtain more perfect visual enjoyment. 2, the whole process of visualization is easy to control After nearly 20 years of clinical use shows that the core of myopic surgery equipment development always revolves around safety control. With the advent of the femtosecond laser, the entire process of corneal cutting is truly visible during surgery, and problems can be detected and corrected in a timely manner, effectively avoiding possible errors during surgery and guaranteeing the quality of surgery. As a result, the corneal flap surface made by the operated eye is smooth, uniform and perfect, almost close to the original state of the cornea, as seen in the slit lamp examination after surgery. In particular, there is only a tiny incision mark after full femtosecond laser surgery. The doctor’s level of treatment is improved: experience and technology is more sophisticated Laser myopia surgery is the doctor’s use of excimer laser or femtosecond laser precision cutting tissue characteristics, reshaping the cornea to achieve the purpose of myopia correction, which is essentially equivalent to cutting a suitable degree of concave lens on the patient’s cornea, the requirements of the doctor are very high. The completion of a quality laser myopia surgery requires not only a thorough examination and evaluation prior to surgery, but also advanced surgical equipment, correct surgical plan, accurate and thorough parameter design, skillful and delicate surgical skills, clean and comfortable surgical environment, and meticulous and solid post-operative follow-up. Therefore, the experience of the surgeon is decisive for the safety of the surgery. At present, in terms of the level of long-term refractive surgeons, after nearly 20 years of uninterrupted myopia surgery research and practice, as well as in the process of trying to promote new technologies, they have accumulated a wealth of clinical experience, and their treatment techniques have been greatly improved. Doctors with a strong theoretical foundation and rich surgical experience have more accurate control over the design of the surgical degree, and can help patients to make more accurate and personalized selection of surgical methods and design of the surgical process; during surgery, they can more effectively anticipate and avoid surgical risks, thus ensuring the safety of surgery; after surgery, they can provide the best personalized treatment to patients to ensure the safety of patients’ eyes in all aspects and to the maximum extent. The best personalized treatment after the surgery to ensure the maximum safety of the patient’s eyes. We are also able to handle complications in a timely and accurate manner, so that the patient’s risk is reduced to a minimum or even to zero, ensuring safety and obtaining the best results.