Laser Myopia Surgery (LASIK)

Excimer laser surgery, the English name LASIK (Laser-AssistedinSituKeratomileusis), is a kind of surgery to improve the vision by changing the curvature of the cornea through the laser. LASIK is performed by an ophthalmologist and is considered to be more suitable for general patients than other similar procedures such as PRK. Compared to similar procedures, LASIK requires less recovery time and less pain. LASIK can correct refractive errors such as myopia, hyperopia, astigmatism, etc. The highest correctable degree is subject to the patient's corneal thickness. Generally, the highest correctable myopia is -12D (1200 degrees). Excimer laser myopia surgery is currently correcting myopia. One of the most effective surgery. Treatment of diseases: myopia myopia Indication 1, between the age of 18-50 years of myopia in the 100-1200 degree farsightedness 100-600 astigmatism within 600 degrees, there are glasses required and fully understand the contents of the surgery. 2, refractive stability for two years, eye examination without active eye disease. 3. Corrected visual acuity is greater than 0.5. 4. Operate the eye with a soft contact lens (contact lens) for 1-2 weeks. 5, the corneal thickness of 450um or more. In addition, LASIK laser surgery has contraindications. Active eye lesions, cornea is too thin, suffering from glaucoma, corneal disease (such as keratitis, intracorneal degeneration), fundus lesions (with retinal detachment, fundus hemorrhage and other diseases). Whole body pedicle tissue disease and autoimmune diseases, severe scars. Pregnant women, glasses with severely poor visual acuity, and those with high vision requirements and serious concerns about surgery are not eligible for LASIK laser surgery. Contraindications 1, keratoconus. 2, dry eyes. 3, blepharitis and other external eye inflammation. 4, intraocular inflammation. 5. Patients with vitreoretinal diseases. 6, glaucoma and ocular hypertension. 7, systemic immunity or collagen disease. 8, mentally handicapped. 9. Correct severe amblyopia with poor vision. Preoperative preparation Before the LASIK operation, soft contact lenses (contact lenses) should be stopped for 1 to 2 weeks, rigid contact lenses for 2 to 3 weeks, and OK lenses for 3 to 6 months. Since not everyone can do LASIK surgery, patients should go to a professional organization for detailed consultation and examination before making an operation decision. 1. Wash your face on the day of surgery, don't make up your eyes, so as to avoid difficulty in disinfecting the eye before surgery. If the cleaning is not thorough, some small particles can be used in the surgical area. Do not use perfume or any irritating cosmetics to avoid affecting the laser. The working state of the machine affects the effect of the operation. 2. Do not wipe or touch the eyes with your hands after local disinfection. 3. When waiting for surgery, relax your mind, don't be nervous, don't talk or prepare loudly during preparation, so as not to be over-excited during surgery, unable to control emotions and affect the surgical results. 4, 3 days before surgery should generally be localized with antibiotic eye drops. 5, should do gaze training before surgery, in order to be able to cooperate well with the doctor during the operation. 6, should have enough sleep one night before surgery. Surgical procedure Myopia is caused by the anteroposterior diameter of the eyeball being too long or the lens being too convex, and the external light cannot be accurately concentrated in the fundus. The excimer laser is an ultraviolet light beam with a wavelength of only 193 nm, which is invisible to the human eye. Its characteristic is that the photon energy is large, the wavelength is extremely short, the penetrating power to the tissue is extremely weak, it does not penetrate into the eye, and is only absorbed by the surface of the tissue. The non-destructive or minimal damage to the surrounding tissue, excimer laser corneal refractive treatment (LASIK), is a special extremely precise micro-keratotomy system (referred to as the keratome) to make the corneal surface tissue into a band After the corneal flap of the pedicle, after flipping the corneal flap, under the computer control, the excimer laser is used to accurately vaporize part of the tissue to be removed under the flap, and then the flap is washed and the corneal flap is reset. The shape of the anterior surface of the cornea adjusts the refractive power of the cornea, so that the external light can be accurately imaged at the fundus to achieve the purpose of correcting myopia. complication Dry eyes and pain.