Ultrathin LASIK saves about 30μm of corneal thickness compared to conventional LASIK flap, which is also the biggest technical highlight of the ultrathin corneal laminar technology, so that the corneal thickness retained after laser cutting is a little thicker, and the corneal thickness retained after cutting is very important for the occurrence of postoperative cone cornea and the maintenance of normal corneal anatomical and physiological functions, which is a very important issue to today’s refractive surgeons in the field of refractive surgery. This is a major concern for today’s refractive surgeons. As a matter of fact, in order to make a perfect ultra-thin corneal flap, not only do we need cutting-edge surgical equipments, i.e., ultra-thin automatic corneal microtome, but we also need the surgeon to master the very skillful and precise clinical techniques, in order to ensure that everything is perfect, and to guarantee the high safety and quality of the surgery.