Is excimer laser myopia surgery really safe? With the increasing sophistication of myopia surgery by excimer laser surgeons and the continuous upgrading of equipment, the safety and precision of the surgery are constantly improving. People not only pursue post-operative vision, but also obsessively pursue perfect vision. All in all, refractive surgery has largely satisfied people’s eagerness to remove their myopic glasses and has brought great convenience to their lives and work. However, many people are torn by the fact that it is after all a kind of myopia surgery. Even though they are full of aspirations for myopia surgery, people are worried about how good the results are after myopia surgery. What is the long-term safety after surgery? Is it more prone to presbyopia? Is it more prone to trauma? Is it impossible to perform other eye surgeries? A series of confusion makes people hesitate to make the choice of whether to accept myopia surgery. 1. What is myopic vision after surgery? People who have some knowledge of myopia surgery know that myopia surgery is the application of an excimer laser to cut the central corneal tissue and flatten the corneal curvature so that the light can be focused on the retina and the vision can be clear. It is the equivalent of creating a pair of “glasses” on the cornea to help improve vision. Therefore, when myopic friends ask a myopic eye surgery specialist how much vision they can achieve after surgery, the specialist will tell you that, in general, the post-operative vision is similar to the best corrected vision with glasses before surgery. That is to say, the best corrected vision with glasses is often the best vision after surgery. 2. What are the long-term results after myopia surgery? Although myopia surgery has been used in the clinic for more than 20 years, the most worrying thing for myopic friends is “will my eyes have problems 20 or 30 years after myopia surgery and will the prescription rebound?” The so-called rebound, also known as regression, is related to the post-surgical corneal trauma proliferation and repair, and if it occurs, it usually happens within 6 months after surgery. Therefore, the longer the time after surgery, the lower the chance of rebound, and even if there is a rebound, the amount of rebound is extremely limited and predictable, and generally does not affect your daily life and work. If the myopia increases within a few years after surgery, other causes will be considered, such as myopia that is unstable before surgery, and myopia may increase after surgery; or the occurrence of its rare corneal dilatation or cone corneas, which are now often newly added to large regular hospitals with an anterior segment analyzer (not corneal topography), which can generally be screened out during the preoperative examination, and you will not be advised to operate. This is why it is very important to use an anterior segment analyzer for preoperative examinations, but many hospitals do not have this equipment. Since myopia surgery was carried out in the 1990s, with the continuous development of inspection and surgical instruments and the diversification of surgical methods, the safety and accuracy of surgery has made a qualitative leap, and the majority of myopic friends have gotten rid of their glasses, obtained good vision, and improved their quality of life. 3.Will myopia surgery affect other eye surgeries? The direct site of myopia surgery is only the corneal tissue at the very front of the eye and does not affect other parts of the eye. Cataracts and glaucoma that appear with age are not directly related to myopic laser surgery and will not affect the ability to do other eye surgeries. 4. Is it easy to cause trauma after myopia surgery? Before doing excimer laser cutting, a corneal flap needs to be made. After laminar excimer laser surgery, the pain response is light and vision recovery is fast, but the resistance of the flap to external forces is relatively weak (in most cases, external forces do not affect the position of the flap unless it is subjected to large external forces); if a femtosecond laser is used to create the flap, the cutting surface, cutting angle and cutting thickness are more precise and uniform, so the postoperative visual quality is better, and the flap fits more firmly after resetting. The ability to resist external forces is greatly enhanced. Therefore, myopic friends who have high post-operative requirements, need to join the military and police academy, or need to participate in antagonistic sports should give priority to femtosecond laser flap surgery or superficial cutting surgery (PRK, LASEK, EPI-LASEK). 5. Is it easy to get presbyopia after myopia surgery? Presbyopia, like skin laxity and osteoporosis, is a normal physiological phenomenon of human aging, manifested as a decline in the power of adjustment, clear vision at a distance, easy to see near fatigue or even difficulties, requiring presbyopic glasses. The symptoms appear earlier for farsighted people, and presbyopia starts to appear from the age of 40 for those who are orthoptically oriented, and according to the condition of the eyes and physical quality, there are deviations in the wearing time of each person, and myopic friends appear the latest. Myopic laser surgery is equivalent to making a pair of “glasses” on the cornea to assist in improving vision, which only solves the problem of myopia, and presbyopia will appear around 45 years of age after myopic surgery (similar to those without myopia who did not have myopic surgery). In the past, before myopia surgery, glasses were worn without the full prescription, or the glasses were taken off to solve the problem of near vision difficulties, which actually concealed the presbyopia condition.