Photorefractive keratectomy for myopia: preliminary results in 147 eyes.
Excimer photorefractive keratectomy (PRK) was performed on 100 consecutive patients (147 eyes) for the correction of myopia. The follow up period ranged from 3 to 16 months (mean, 8). Preoperative myopia ranged from -1.75 to -8.75 D (mean -3.90 D). Patients were divided into three groups for analysis based upon their degree of preoperative myopia: mild (< or = 2.90 D), moderate (-3.00 to -5.90 D), and severe (> or = -6.00 D). Uncorrected visual acuity was 20/40 or better in 88.4% (130/147) overall; 97% of mild, 91% of moderate, and 68% of severely myopic patients. Preoperative astigmatism remained the primary cause of reduced uncorrected visual acuity. Postoperatively, 68% of patients overall had a spherical equivalent refraction within +/- 1.00 D. The majority of treated corneas had trace (53%) to mild (29%) subepithelial haze. One patient with severe myopia developed significant subepithelial opacification postoperatively with partial regression and loss of one line of best spectacle corrected visual acuity.
Windsor Laser Eye Institute, Ontario, Canada.
J J
JJ
Machat
F
F
Tayfour
D000328:Adult; D001251:Astigmatism / Q000209:etiology; D003315:Cornea / Q000601:surgery*; D003318:Corneal Opacity / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053685:Laser Therapy / Q000009:adverse effects; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D016896:Treatment Outcome; D014786:Vision Disorders / Q000209:etiology; D014792:Visual Acuity