Photorefractive Keratectomy by Extimer Laser for the Correction of Myopia

ABSTRACT

Photorefractive keratectomy was performed, using the excimer laser, on 117 myopic eyes. The eyes were classified in three groups by preoperative refractive errors, Group I included eyes with myopla ranging from -2.00D to -5.75D; Group 2 included eyes with myopia ranging from -6.00D to -9.75D; Group 3 included eyes with myopia over -10.0D. The eyes were followed up over six months to one year. During the follow up period, slit lamp examination, visual acuity, refractive error, pachometer, corneal opaty, IOP and corneal topography were examined, The results were as follows; 1. Preoperative mean visual acuities were 0.07 and postoperative mean visual acuities were 0.72. 2. Postoperative refractive errors were smaller and visual acuities were better in eyes of Group I than Group 2 or 3. 3 Immediate postoperative refractive states were hyperopia and regress over 4 to 12 weeks. 4.Keratometer reading and central corneal thicknesses were decreased postoperatively, but 4 to 12 weeks later, they started to increase. 5 There were mirlimal comeal corneal peaking at 4 weeks and diminishing over the next 3 to 6 months, which were not felt to be visually signicant.