Laser subepithelial keratomileusis

After PRK surgery, there are significant disadvantages such as significant pain and corneal haze. Although LASIK has largely overcome the shortcomings of PRK, it may bring potential risks due to the need for corneal flaps. Camellin (1999) introduced a method called LASEK, laser epithelial keratomileusis, which is an improved method of PRK. The surgery does not remove the corneal epithelium from the laser cutting area, but lifts it completely from the front elastic membrane. After the laser cutting is completed, the corneal epithelial flap is restored. Treatment of diseases: myopia myopia Indication Low and moderate myopia. Contraindications 1, keratoconus. 2, moderate and 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. 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 sign the surgical consent form. 3, 1 to 3 days before surgery, local antibiotic eye drops, 1% pilocarpine eye drops 1 time before surgery. 4, according to corneal surgery before surgery, eye drops, disinfection. Surgical procedure 1. The corneal surface anesthetic is dripped 2 times, and the opener is opened. 2. Corneal epithelial pre-cut. Using a special 8mm diameter epithelial trephine, the drill edge is calibrated to 60~70m, and it is pressed down and swayed 2~3 times (about 10°) to cut the epithelium without damaging the front elastic layer. Will cut in). At the same time, since the trephine has an 80° gap at 12 o'clock, there is an epithelial junction pedicle similar to the LASIK flap when the epithelial flap is lifted. 3. Loosen the epithelium. Place a cylinder of 8, 5 mm diameter on the cornea, drop 20% ethanol 0, 1 ml (distilled water), and leave it for 30 s to ensure that ethanol can enter the epithelium and the front elastic layer from the epithelial cutting edge. The connection is loose. 4. Rinse. Rinse the surface of the eye thoroughly with BSS. 5. Pick up the corneal epithelial flap. The corneal epithelial flap was gently peeled off to a 12 o'clock position with a special spatula. Pay attention to the completion in a short time as much as possible to avoid uneven surface dryness of the front elastic layer and affect the uniform absorption of laser energy. 6, laser corneal cutting. Same as PRK. 7, corneal epithelial flap reduction. Be careful to drop a little BSS first to ensure that the lubrication makes the epithelial reduction easy to operate. After the epithelial reduction, wait 1 min for the epithelial adhesion to be firm. 8. Wear a therapeutic soft contact lens and drop antibiotic eye drops.