What is SBK surgery? SBK surgery is a new type of LASIK surgery. SBK is the first letter of Sub-Bowman-Keratomileusis (anterior elastic sublaminar laser keratomileusis). Compared with other types of LASIK (standard LASIK, ultra-thin LASIK, etc.), the SBK procedure is a great breakthrough in terms of technological innovation. However, the procedure is basically the same, the first step of the surgery is to make a corneal flap, and then the excimer laser is used to cut the cornea for treatment. The depth of the corneal flap made by other types of LASIK surgery is in the stroma layer of the cornea, and the thickness of the flap made is generally between 120-160 microns; while the depth of SBK is located between the anterior elastic layer of the cornea and the stroma layer of the cornea, and the corneal flap made by the SBK surgery is usually around 95 microns, which, in other words, is thinner than that of the corneal flap made by other types of LASIK. In other words, the flap created by SBK surgery is much thinner than other types of LASIK. What are the benefits of SBK? Numerous clinical studies have shown that the thinner the corneal flap, the safer the laser corneal surgery. The ideal location for a flap is between the anterior elastic lamina and the corneal stroma. So what are the benefits of creating a thin corneal flap in this position? 1. The first third of the corneal stroma is the strongest and densest area of corneal tissue, and it gradually weakens from front to back. Therefore, the thicker the corneal flap is, the more obvious the biomechanical weakening of the cornea will be after surgery. the corneal flap made by SBK will make the corneal structure more stable, the biomechanical change of the cornea after surgery is less, and the risk of corneal bulging will be smaller. 2. The laser cutting site is closer to the front of the cornea, which can leave more corneal stromal tissue, not only expanding the treatment range, but also reducing the risk of surgery for patients with high myopia and patients with thin corneas. 3. Due to the thin corneal flap, the laser cutting position is shallower and less nerve is damaged, which makes the postoperative recovery of corneal perception faster, and the incidence of postoperative eye dryness will be significantly reduced. 4, SBK technology flap making accuracy is higher, the corneal flap is smoother, effectively reduce the postoperative glare, halo, can improve the quality of postoperative vision.