What is excimer laser subepithelial keratomileusis? Excimer laser corneal surgery has been introduced to China since 1995, and has become increasingly popular among myopic patients for its safety and stability, with millions of myopic patients choosing this procedure every year to return to a clear and bright world. The most widely performed procedure is “excimer laser in situ keratomileusis”, abbreviated as LASIK, also known as IK, which is performed by cutting a corneal flap with a thickness of 130-160 microns with a tip in the superficial layer of the cornea with a lamellar keratome, because the flap is thicker and the corneal stroma under the flap is thinner, so it is not It is not suitable for patients with thin corneas and high myopia. In 2001, another foreign procedure was introduced in China, namely “excimer laser subepithelial keratomileusis”. The procedure involves chemically loosening the corneal epithelium, peeling a tipped corneal epithelial flap of only about 60 microns in thickness with a corneal spatula, then cutting the corneal stroma in the central region with an excimer laser under the flap, and finally restoring the epithelial flap to its original position. Because the flap is thinner, the thicker corneal stroma is preserved, which is suitable for patients with thin corneas and high degrees; no incision is needed, which is also suitable for patients with small eyes and corneas that are too flat or steep for LASIK surgery, and the “flap risk” of the lamellar keratome does not exist, making the surgery safer. It is also safer than LASIK for patients with corneal neovascularization and long-term corneal contact lens wearers, and has better postoperative visual quality and a lower incidence of dry eye. However, this procedure also has a major disadvantage, that is, the postoperative complication of “subepithelial haze”, especially in highly myopic patients, this complication is the main cause of postoperative rebound and vision loss, which affects the surgical results and limits the development of this procedure, and even Many hospitals do not perform it, thus turning away many myopic patients with thin corneas. What is modified excimer laser subepithelial keratomileusis? Modified excimer laser subepithelial keratomileusis is a modified surgical procedure to address the complication of “haze”, in which an immunosuppressant is used in a special way in the corneal laser cutting area. The postoperative period is very good for avoiding this complication and no more rebound and loss of vision.