The characteristics of the laser myopia correction population in China are different from those in developed countries, mainly young people, especially during the annual holidays, which is a peak period for students to receive excimer laser surgery for myopia. A clinical survey shows that more than 90% of students undergo surgery because of the need to apply for certain professional medical examinations and job hunting. For this reason, they often hope that the post-operative myopia is “zero”. Laser myopia treatment, “zero” is not necessarily the right choice. Excimer laser keratomileusis is the collective name for all kinds of laser surgery for myopia, and there are extremely strict requirements for the selection of surgical indications, so not every myopic patient is suitable for surgery. The goal of laser myopia surgery is to help people completely get rid of or somewhat reduce their dependence on glasses through surgery. The final corrected vision depends on the degree of myopia, astigmatism size, corrected visual acuity, corneal thickness, corneal refractive error, age, occupation, and procedure type, not on the individual’s wishes. If some people blindly undergo laser vision correction surgery in unregulated medical institutions, it can lead to serious adverse consequences on vision. Case click Xiao Liu is 25 years old, in order to get a satisfactory job, six months ago 1200 degrees of myopia he underwent excimer laser surgery in a hospital. The surgeon who performed the surgery for him was a foreign doctor hired by the hospital and left after the surgery. So far Xiao Liu eye problems have been nearly 3 months, never see the doctor’s shadow. Not long ago, due to corneal problems, Liu’s eyes are close to blindness. A few days ago, he went to a large eye hospital in Beijing for treatment, and after consultation, Xiao Xu was a victim of irregular treatment. A certain safe thickness must be retained after corneal cutting, which is generally recognized as 410 um. According to the thickness of Xiao Xu’s cornea, he could only lose up to 800 degrees of myopia through the surgery, but the surgery reduced his myopia to zero. Corneal thinness is the direct cause of corneal dilation. Laser myopia treatment emphasizes personalized surgical solutions Excimer laser keratomileusis has strict requirements for myopic patients: age at least 18 years old, relatively stable myopia in the past two years, contact lenses stopped wearing for at least one week, patients should have the need to remove glasses through surgery and have reasonable requirements for post-operative results, except for contraindications to surgery, and finally, they should voluntarily undergo the surgery. Excimer laser keratomileusis has many contraindications, such as thin corneas, cone corneas, high intraocular pressure, fundus lesions, amblyopia, etc. Excimer surgery cannot be performed, otherwise it may lead to postoperative vision loss or serious eye damage, or even retinal detachment. Therefore, a precise preoperative examination must be performed. The preoperative examination must include such routine examinations as naked eye vision, corrected vision, computerized optometry, subjective optometry, dilated optometry, fundus examination, corneal slit lamp examination, tear secretion function examination, tear film rupture time, intraocular pressure examination, corneal thickness measurement, corneal topography, etc. The latter two examinations can provide more detailed The latter two tests can provide more detailed ocular parameters, which become extremely important for the exclusion of early cone corneas, the design of surgical plans, and the selection of surgical procedures, and are also crucial to the success or failure of surgery. Everything has a degree, and so does laser treatment for myopia. This degree depends on the degree of myopia, astigmatism, corrected visual acuity, corneal thickness, corneal refractive error, age, occupation, and surgical procedure, and not on the individual’s wishes. Take corneal thickness as an example. The cornea is located at the very front of the eye. Structurally, the cornea is divided into 5 layers from front to back, of which layers 1 and 2 together account for about 5% of the thickness; layers 4 and 5 account for about 5% of the thickness. The 3rd layer accounts for 90% of the thickness. Laser treatment of myopia is done on layer 3. Provided that laser treatment is available, the thickness of the cornea determines what treatment options are available. For example, if a myopic patient has a corneal thickness of 510um, a corneal thickness of 410um needs to be preserved to ensure the safety of the eye. 510-410 = 100um, and this 100um can only be used for myopic laser treatment. If this patient’s myopia is within 800 degrees, such a thickness is perfectly treatable, but if he has 1200 degrees of myopia, then such a thickness is obviously not enough, and there is a small amount of myopia left after treatment. If all the myopic degrees are done, it will result in too thin a cornea and there is a risk of causing corneal dilatation and cone corneas, which can seriously affect vision. This is just one of the factors to consider in the design of the surgery. Removing glasses is not everything. Patients who are ready to undergo laser surgery can choose a hospital from the following aspects: 1. Choose a regular hospital with a reputation and guaranteed technology, rather than blindly following low prices and advertising words. There is a limit to lowering costs, and a very cheap price is likely to bring risks that cannot be measured in money. 2, to have in-depth communication with the surgeon. The benefit of communication is that by communicating with the physician, a responsible and experienced doctor can patiently answer the patient’s questions, objectively evaluate the surgery and choose the procedure, while most of the doctors who only talk about the advantages and not the disadvantages are lazy; at the same time, the doctor can understand whether the patient’s expectations of the surgery are reasonable. Other things that patients can learn include whether they are suitable for surgery, which procedures they can choose, what are the differences between the various procedures, the risks that may occur, what consequences they will face in case of risks, and how to deal with these complications. It is also important to note that not everything will be fine once you remove your glasses after surgery. On the day of surgery, the eyes will generally be sore and teary and the foreign body sensation will disappear after a few hours, so you should rest for a few hours after surgery with your eyes closed and do not squeeze your eyes hard. The next day, the doctor will remove the transparent eye patch and check the vision, cornea and refractive status, and then go for a review 7 days, 1 month, 3 months, 6 months and 1 year after surgery. Avoid going to places with large amount of smoke and dust within 4 days after surgery, do not put makeup on your eyes, do not rub your eyes with your hands, and avoid having sewage and fine dust particles in your eyes. Avoid watching TV, computer, books and other close up fine eye work for one week. Do not swim for six months, avoid diving and intense confrontational sports, and avoid rubbing the eye to avoid dislocation of the corneal flap and other conditions. After surgery, antibiotic eye solution, hormone eye solution and eye solution to promote corneal epithelial growth and prevent dryness should be used as prescribed by the doctor. After surgery, due to the change of refractive state, some people may feel difficulty in seeing near and easy fatigue in the early stage. If work and study cannot be avoided, more intervals, more blinking and more rest should be taken, and the symptoms usually disappear gradually over time. It is important to eat more vegetables and fruits, prevent constipation, and avoid the impact of forceful stool on the eyes. Attention should also be paid to avoiding the effects of colds and coughs on the eyes.