What is the principle of excimer laser treatment for myopia Myopia is caused by the anterior and posterior diameters of the eye being too long and the anterior surface of the cornea being too convex for external light to accurately converge on the fundus of the eye. Excimer laser (LASIK/PRK) is a computer-controlled excimer laser that etches the corneal stroma in the pupil area according to the degree of myopia and the presence of astigmatism, resulting in a slight flattening of the anterior surface of the cornea. This allows external light to converge and image accurately on the retina at the base of the eye to correct myopia. Is excimer laser surgery the best means of myopia treatment Overall, excimer laser surgery is safe and effective, and with the advancement of technology and experience, the success rate of this surgery will be further improved, and it is currently an important way to correct refractive errors and mainstream surgery. Numerous treatment methods can be divided into two categories, namely, surgical and non-surgical therapies. Non-surgical treatments include various optical correction devices, such as common frame glasses, various types of contact eyes; various therapeutic devices, functional training and physical therapy. Drug therapy three. There are four types of surgical therapies: corneal surgery, lens surgery, scleral surgery and laser treatment for presbyopia. Excimer laser surgery, which we talked about, is a type of corneal surgery and is divided into excimer laser keratomileusis (PRK), which has the best results in treating low numbers, and excimer laser in situ keratomileusis, which has the best results in high numbers. Whether treated with frames or contact lenses, or with excimer laser surgery, all are options for myopic patients to correct their vision. How is excimer laser surgery different from other correction methods Frame glasses are the most common optical correction tool for general myopia, hyperopia, astigmatism and other types of refractive errors, and can be worn by patients of all ages. In general, frame glasses only correct vision, and have limited effect on the treatment and prevention of refractive errors, especially for some high myopia, farsightedness, high astigmatism, etc. correction treatment effect is poor. Some special industries, such as drivers, etiquette and other industries have some restrictions on the wearer of glasses and inconvenience in life. Compared with frame glasses, contact lenses have the advantages of wide field of vision, realistic vision, comfortable wearing, conducive to sports, beautiful appearance and safe use. Because of the limited oxygen permeability of soft lens materials, they should not be worn for long periods of time. There are also rigid gas permeable contact lenses with excellent breathability, which are healthier for corneal tissue and are suitable for patients of all ages, especially for refractive error patients who need to wear contact lenses for a long time. Orthokeratology lenses (Ortho-KCL), commonly known as OK lenses, can reduce some of the myopia in a short period of time and quickly improve bare eye vision in moderate and low myopia. However, orthokeratology lenses are medical devices and must be fitted under the supervision and guidance of an ophthalmologist or optometrist. To maintain good control, the lenses need to be worn for a long period of time for observation. These non-surgical methods avoid the risk of surgery and post-operative complications, and the correction effect is obvious, accurate, and can be constantly corrected with its own changes. However, the care of cleaning, maintenance, disinfection and regular inspection during use is more tedious, especially for pediatric patients, with adult help, guidance and supervision from the side to ensure safety. Various physical therapy and drug treatment methods are safe and have a certain effect on prevention, but the treatment period is long and the final effect is difficult to determine. Excimer laser treatment for refractive error is a widely used and popular form of corneal surgery. Excimer laser keratomileusis (PRK), as discussed in the previous question, is like making a concave or convex lens of the cornea to correct myopia or hyperopia. The procedure is simple, safe, and effective for low to moderate diopters (under 600 degrees). However, there are problems such as post-operative eye pain, rebound, and corneal clouding. Excimer laser in situ keratomileusis (LASIK) is suitable for patients with moderately high or super high myopia. It has better predictability and accuracy, less postoperative pain and faster recovery. However, the operation technique is complicated, and there are also problems of under- or over-correction, corneal astigmatism, and degree rebound. In addition, there are surgical methods such as superficial corneal lens transplantation, interlayer corneal transplantation, interlayer artificial cornea, corneal stromal endograft ring implantation, and lamellar keratoplasty. These procedures have their own characteristics for different refractive diseases, but most of them have some limitations or immature technology, and the clinical application effect and value need to be further observed, so they are not widely adopted and popularized. Lens surgery and scleral surgery are for people with high myopia, and although they are predictable and efficient, they must be selected strictly and reasonably because of serious and obvious side effects and the complexity of the surgery.