Since the excimer laser was successfully developed at Columbia University in 1982, the procedure, which cuts the cornea to treat myopia and other refractive conditions, has taken the world by storm. I believe that many people would like to remove their glasses, but they feel afraid if they think about going for the surgery, so now I will give you some information about excimer surgery. Simply put, you can imagine your cornea as the lens of an eyeglass, and the laser of the surgery simply thins it so that the corresponding myopia is eliminated, and this is the principle of treating myopia. Here are some of the concerns that people have. 1. This is a laser, will it burn my eyes out? There are many kinds of lasers, some can penetrate steel plates, some can burn plastic, but this laser is a cold laser, in other words, it is cool and will not make you feel hot; and its penetration is very weak, a beam of excimer laser can only penetrate something as thick as a hair, so it will not penetrate the eye, so you can rest assured. 2. Is everyone suitable for excimer laser? First of all, you must be at least 18 years old, and your myopia must change by less than 50 degrees a year. The reason why we need to limit this is because after the age of 18, everyone’s myopia is fixed and generally the number of degrees will not change anymore. For example, if you have 300 degrees of myopia and next year it goes up by 200 degrees, then if you get rid of 300 degrees of myopia now, next year you will have 200 degrees of myopia again. This is why you need to be over 18 years old and have very little change in your prescription. 3. How long after surgery can I use my eyes normally? For this point, my opinion is that the safety factor of excimer laser is very high and the trauma is very small. Under normal circumstances, you can use your eyes normally on the second day (playing with cell phones, watching computer and TV are all no problem), but you should pay attention to avoid rubbing your eyes within one month, because it takes one month for the corneal wound to grow completely.