EK surgery for myopia, also called LISEK surgery, is a relatively common excimer laser procedure that costs about $8,000 at present. The principle of the procedure is to remove the epithelial layer of the cornea, thereby performing excimer laser ablation on the surface layer of the cornea, which can change the refractive state of the eye. The advantage of the procedure is that the epithelial layer of the cornea is relatively thin, so the requirement for corneal thickness is not as high, and there is no need to worry about the complication of epithelial flap displacement after surgery.