Excimer laser surgery for myopia has been performed in China for nearly 20 years, and with the continuous advancement of technology and the addition of femtosecond lasers in recent years, excimer laser surgery for myopia has become safer and more effective. However, in recent days, questions about the safety of the surgery have gained momentum, so is excimer laser surgery safe? If you want to know whether myopia surgery is safe or not, you need to understand the process of myopia surgery. Here, I will first introduce the process of excimer laser surgery. Lasik surgery (excimer laser in situ keratomileusis) is the mainstream excimer laser surgery for myopia. The surgery is divided into two major steps: first, a special, extremely precise microkeratome cutting system (microkeratome for short) is used to create a circular corneal flap with a tip from the surface layer of the cornea. After the flap is flipped, the tissue to be removed from the stroma is precisely vaporized with an excimer laser under computer control, and then the flap is flushed and reset under the flap to change the shape of the anterior surface of the cornea and adjust the refractive power of the cornea to correct myopia, hyperopia or astigmatism. So, is it safe to create a flap with a tip during the procedure? The corneal flap is just over 100 microns, which is one-tenth of a millimeter. In the second step, the stromal layer of the cornea is cut with an excimer laser. Is the excimer laser safe? Will it penetrate the person’s eye and break the tissue mechanism inside the eye? Will it cause severe inflammation? In fact, who is not afraid of cutting and laser on the eye? It is normal for patients to have concerns and doubts about the safety of the surgery before the surgery. It is better to answer these questions with our rich clinical experience at Beijing Tongren Hospital. Our annual Lasik surgery at Beijing Tongren Hospital is more than 10,000 eyes, and there are not many proportions of poor corneal flap formation that occur during the corneal flap making process and require rescheduled surgery. Moreover, it is these occasional postponed patients who come back with excellent clinical outcomes after surgery. These data are still based on conventional lasik surgery using a microkeratome (mechanical knife) to create the corneal flap. So, can excimer laser cutting of the corneal stroma cause damage to the interior of the eye? The excimer laser is an ultraviolet laser produced by mixing two gases, fluorine and argon, and its wavelength is only 193 nanometers, the characteristics of this laser is not penetrating, will not penetrate into the eye, is a cold laser, no heat effect, can be “irradiated” to the human eye corneal tissue for precise vaporization, to achieve The unique nature of the laser is that it is the most suitable for keratoconus surgery because it can precisely vaporize the corneal tissue by “irradiation” without damaging the surrounding tissues and other organs. The shape of the cornea is modified by the excimer laser and flattened centrally, as if the prescription of one’s own frame glasses were done to the eyeball. After the flap is reset and flattened and the wound heals, the curvature of the cornea is changed and the treatment of myopia, astigmatism and hyperopia is achieved. Our eye is divided into three layers, the outermost layer is the cornea and sclera, the middle is the choroid, and the innermost layer is the retina. Now you understand that lasik surgery, is like a surgery on a basketball, the basketball is divided into the spherical skin, the spherical gall, myopia surgery is just a small incision on the spherical skin, and then still the laser (morphological changes) is done on the spherical skin, and the spherical gall is not touched at all. So the surgery is very safe. With the advancement of technology, femtosecond laser has been used in recent years for the creation of corneal flap in lasik surgery. In large hospitals with strong general practice, the femtosecond laser is gradually replacing the microkeratome for the flap making process. Due to the better accuracy of the femtosecond laser, the chance of complications due to the creation of the flap is now hundreds of times less than the chance of complications formed by the original mechanical knife (microkeratome). Therefore, lasik is a safe, effective and very well established surgical procedure. lasik is an FDA approved treatment for refractive errors in the United States. In the United States, more than one million people have excimer laser treatment each year. These include astronauts, pilots, and other special occupational groups with extremely high eye vision requirements. In China, more than 1.5 million people with myopia receive excimer laser treatment each year. The vast majority of these patients achieve good clinical results. However, in the clinical work. We also found that many misunderstandings due to many people’s lack of knowledge and understanding of this surgery, and even some complications of refractive surgery have been fabricated. And these statements are widely circulated, causing problems with many patients. Many patients tend to consult their doctors before the myopia surgery, and here I will give you a summary. One of the most common questions is whether you can do airplanes after lasik surgery. The patient’s question is flying, the air pressure has changed, and they are worried that the cornea has become thinner after eye surgery and will not squeeze the eye that has been operated on. In fact, think about it, our eye is a solid sphere, if the eye can be squeezed by the air, it takes how much pressure ah, before the eye is not squeezed, we used to breathe the lungs have been squeezed. There is no one left to talk about whether the eyeball will be squeezed. So, I would tell the patient that there is no problem, and there is no problem going to the plane the day after the surgery. There is also a more common doubt, mostly focused on girls, who are worried that if they have had myopia surgery, they can’t have a baby on their own and have to have a C-section. The reason for the worry is also that there is a change in the pressure on the eye when you exert yourself during childbirth, and that problems will occur. In fact, if it is a girl who has no lesions in the fundus before the surgery, she will not have any problem to give birth by herself in the future. There is no need to worry about the eye giving out. What really needs to be worried is that patients with high myopia may suffer from bleeding in the fundus or retinal detachment due to poor development of blood vessels and retina in the fundus itself. But. These are caused by high myopia itself, and have little to do with myopic surgery. There is also a misconception that it is good and worthwhile for people with high myopia to have myopia surgery, while it is not good or necessary for those with low to moderate myopia. In fact, according to our clinical observation in Beijing Tongren Hospital for many years, patients with low to moderate myopia are good candidates for myopia surgery because they have fast vision recovery, less surgery regression, and low chance of other complications. In contrast, patients with high myopia, due to their own high myopia caused by poor fundus status, such as: fundus hemorrhage, retinal detachment, vitreous turbidity, progressive corrected vision loss and other occurrence of higher than normal people, after myopia surgery, the incidence of the above problems is still high, at the same time, because the surgery process cutting more corneal tissue, easy to occur refractive regression and other problems. These problems are mainly caused by the fact that the patient himself is highly myopic and have nothing to do with the lasik surgery itself. The eyes are the windows to the soul, and everyone wants to have bright eyes. Myopia surgery is the best way to help people with refractive errors to remove their eyes, improve their personal image, enhance their quality of life and expand their career options.