There is a lot of concern about the “regression” and “rebound” of myopia surgery. We hope that you will have an objective judgment after reading the following. In recent years, more than 500,000 people in China undergo laser refractive surgery each year to correct myopia. For every myopic patient who wants to have the surgery, despite the fact that the safety, effectiveness and predictability of laser myopia surgery are known for sure, they are still apprehensive. I often hear that “so-and-so’s vision has rebounded after surgery and he wears glasses again”, so much so that many times some of my friends often say to me, “I am worried about the long-term effect, such as three or five years, or even ten or twenty years, will it rebound or not? Will I be blind?” I will tell my friends who want to have surgery: “After detailed pre-operative examination, evaluation, and comprehensive analysis and design of the parameters of the surgery, you should believe in medicine and doctors, most of them will not rebound, and even if they do, the amount is very small!” Mild myopia (within 300 degrees) rarely “bounces back”! Even if the “rebound” is very small, it hardly affects the clarity of vision at a distance. Moderate myopia (between 300 and 600 degrees) even if there is a “rebound” of 50 degrees, it still does not have a significant effect on distance vision. In high myopia (600 degrees or more), although the likelihood of rebound is higher than in mild to moderate myopia, in terms of volume, most postoperative “rebound” will not exceed 100 degrees, provided that the preoperative corneal thickness is normal. The majority of people with very high myopia (near 1000 to less than 1500 degrees) also have their glasses removed, and may only need to be careful when driving at night. The dependence on glasses in normal situations is significantly reduced, and the quality of life is significantly improved. In other words, even if high myopia “bounces back”, most people can still do without glasses. The “rebound”, in most cases, is also predictable, and it is rare that the “rebound” actually exceeds the predicted value. It is also reassuring to know that the amount of “rebound” is insignificant compared to the original myopia, e.g., usually no more than 5%. So why is there a “rebound”? Excimer laser keratomileusis is a cutting procedure on the cornea, which is equivalent to “cutting” a lens, the myopia correction method is to flatten the cornea, but the corneal tissue is a living tissue, after cutting can have a certain proliferation force. If there is slightly more proliferation in the central cornea than in the peripheral zone, the central cornea will slightly elevate, albeit very slightly, causing a mild myopia, or “rebound” (regression). This was observed in the PRK era, and the amount of rebound can increase with myopia. However, both LASEK/epi-LASIK and LASIK are not prone to rebound. Furthermore, the cornea has some elasticity in its own tissues, unlike wood and stone which are carved with minimal deformation, the cornea is soft, and a flattened cornea with a little anterior convexity change can show a little “bounce” even though the amount is small. The “rebound” can be intervened. For example, if a “rebound” of 50 degrees is determined at the time of surgery design based on age, base and progression, an additional 50-100 degrees can be removed (overcorrection) and then stabilized 3-6 months after surgery to be very close to “0”. At the same time, the eye drops given by the surgeon after surgery can effectively control corneal proliferation and proptosis, and can prevent “rebound” as long as the medication is used as prescribed after surgery. There are some cases that require caution: for example, myopia before surgery is not stable, and new myopia appears in 2012 after surgery, and the axis of the eye is lengthened, but the patient mistakenly believes that it is a “rebound” (to prevent this situation: pre-operative medical history is very important, for example, it is judged that there will be an increase of 100 degrees in the future, theoretically the surgery is designed to correct 100 degrees more) The patient may have a thin preoperative cornea or a dilated cornea, and the postoperative cornea may be protruding or dilated or conical (the probability of this is very, very small with standard surgery!) The patient is also mistaken for a “rebound”. In a word: the appearance of new myopia after surgery is not necessarily a rebound, but requires a comprehensive analysis and evaluation after a detailed examination of the eye.