radial keratotomy

1. Age 18 to 20 years old, diopter increased in the past two years lt; 2.0d. 2. Refractive diopter - 2.00d ~ -6.00d. 3. Occupation For those engaged in strenuous exercise, pilots, firefighting, accounting and computer operations, surgery should be carefully considered. 4. Excluding eye related diseases such as dry eye, corneal disease, cataract, glaucoma, low intraocular pressure, infectious ocular lesions and severe intraocular lesions. 5. Psychological abnormalities should be treated with caution. Treatment of diseases: ametropia Indication 1. Age 18 to 20 years old, in the past two years, the diopter increased <2.0d. 2. Refractive state: diopter -2.00d ~ -6.00d. 3. Occupation: For those engaged in strenuous exercise, pilot, fire, accounting and computer operation, surgery should be carefully considered. 4. Excluding eye related diseases such as dry eye, corneal disease, cataract, glaucoma, low intraocular pressure, infectious ocular lesions and severe intraocular lesions. 5. Psychological abnormalities should be treated with caution. Contraindications 1. Progressive myopia, the degree of myopia increased by more than 1.00 diopters per year; 2. Monocular vision or one eye vision is not good; 3. Eye disease, such as glaucoma, keratitis, etc.; 4. Diabetes, hepatitis, tuberculosis Wait. Preoperative preparation 1. Small pupil and dilated computer and retinoscopy optometry, eye movement examination, intraocular pressure measurement, external eye examination, slit lamp microscopy and fundus examination. 2. Keratometry and computer-assisted corneal topography. 3. Corneal thickness measurement. The results of the ultrasonic corneal thickness gauge are more accurate. 4.a Super eyeball front and rear axial length measurement. 5. Scleral hardness, anterior chamber depth, corneal endothelial cells and corneal tactile examination. Surgical procedure 1. 1% pilocarpine 1 hour before surgery. 2. Topical anesthesia Apply 0.5% dicaine or 0.4% topical anesthetic drip, once every 5 minutes for 3 times. 3. Open the device. 4. The patient looks at the coaxial light source of the surgical microscope to determine the central position of the visual axis of the cornea. 5. Center the viewport and use the viewport marker to position the center viewport. 6. The number and position of the incision markers. 7. Fix the eyeball with a scleral fixator. The diamond knife cuts the corneal thickness vertically along the incision mark by 90% to 95%. Cut the anterior cornea and the surface should not be too dry or too wet to reduce drag and avoid epithelial wear. The incision sequence is symmetrically cut at 90° to 270°; 0° to 180°. The thinnest part of the corneal ultrasound thickness can be arranged at the last incision to avoid early cutting and affecting the operation. 8. After all incisions are completed, the incision is flushed with a balanced salt solution to remove epithelial debris. Also check the depth of each incision to see if there are small perforations. 9. Intraoperative subconjunctival injection of gentamicin 20,000 units and dexamethasone 2.5mg, plus eye pads. To reduce pain during or after injection, add 2% lidocaine 2ml to the drug solution. complication Such as keratitis, infection for surgery, can occur within a few days after surgery, corneal incision inflammation, the source of the disease can be Staphylococcus aureus, Staphylococcus epidermidis, Pseudomonas aeruginosa, fungi and herpes simplex virus.