Microkeratectomy

Microkeratome resection is for myopia of -2.00 to -32.00d, especially above -15.00. The following conditions must be met: 1. Age 20 years of age (special circumstances are relaxed to 18 years of age). 2. The refractive state is stable for more than 2 years. 3. rk underwent myopia after 2 years of rk surgery. 4. Corrected vision has improved. Treatment of diseases: sigmoid keratopathy herpes simplex keratitis exposed keratitis Indication Myopia from -2.00 to -32.00d, especially above -15.00. The following conditions must be met: 1. Age 20 years of age (special circumstances are relaxed to 18 years of age). 2. The refractive state is stable for more than 2 years. 3. rk underwent myopia after 2 years of rk surgery. 4. Corrected vision has improved. Contraindications 1. keratoconus. 2. Moderate or severe dry eye syndrome. 3. Other serious internal and external eye diseases and eye diseases. Preoperative preparation 1. Preoperative routine examination: visual acuity, corrected visual acuity, retinoscopy after astigmatism and computer optometry, corneal topography, ultrasonic corneal thickness, intraocular pressure, slit lamp microscopy, three-sided fundus examination, b-ultrasound and fundus if necessary Fluorescence imaging. 2. Explain to the patient the simple principle of the operation, the surgical procedure, and the possible occurrence of the operation. The patient or his relatives agree to the bookmark in the operation. 3. 1 to 3 days before surgery, local antibiotic eye drops, 1% pilocarpine 1 hour before surgery. 4. Wash the eye and disinfect according to the routine operation of the cornea before operation. 5. Surgical design: According to the corrected diopter, look up the table to obtain surgical data, and checked by 2 people. 6. Assemble according to the operating procedures, check the corneal incision knife, and adjust the thickness of the corneal cap (the first cutting thickness). Surgical procedure 1. Open the device and determine the center of the cornea visual axis and mark it. 2. The negative pressure fixing ring is centered on the center of the marked cornea to attract the fixed eyeball. The flattening tonometer measures the intraocular pressure >60 mmhg. 3. Start the microkeratome and cut the knife along the channel on the negative pressure fixing ring for the first time from the corneal side. 4. Flip the corneal flap. 5. Select the appropriate type of negative pressure retaining ring to attract the fixed eyeball. The flattening mirror measures the diameter of the layer to be removed and is consistent with the design. Micro-cutting the knife to the cut thickness (second cut thickness) as designed. 6. With the first cutting method, the second cutting is performed to cut off the certain diameter and thickness of the lamellar matrix required by the design. And check if it is consistent with the design. 7. Flush the cutting surface and dry it thoroughly. The corneal cap is reset. 8. After the corneal flap is unbiased or adhered firmly, the opener is removed, and the patient is blinked to confirm that the corneal flap is not displaced. 9. Under the conjunctiva, a small amount of antibiotics and hormones are injected into the eye, and a hard eye mask is worn.