Korean J Ophthalmol.  1995 Dec;9(2):101-106. 10.3341/kjo.1995.9.2.101.

Double-pass excimer laser photorefractive keratectomy: treatment in 62 eyes with high myopia

Affiliations
  • 1Department of Ophthalmology, Dongsan Medical Center, Keimyung University, School of Medicine, Taegu, Korea.

Abstract

To evaluate the efficacy and safety of Excimer Laser Photorefractive Keratectomy (PRK) on the correction of high myopia, we performed planned double-pass PRK procedure at the same session on 62 eyes of 55 patients with myopia ranging from -6.30D to -15.25D (mean, -9.94D). In the first pass, a myopic correction of -6.00D with a 4.5 millimeter ablation zone was performed, and immediately after, a second correction of remaining myopia with a 5.0 millimeter ablation zone was performed. Attempted correction ranged from -6.30D to -9.50D (mean, -8.70D). The eyes were divided into two groups which were -10.50D or less (group A), and higher than -10.50D (group B). All the eyes received topical corticosteroid therapy postoperatively. One year after double-pass PRK, uncorrected visual acuity in group A and B improved to 20/40 or better in 84.0%, and 73.3% of the eyes and to 20/30 or better in 75.0% and 33.3% of the eyes respectively. The mean refractive errors at 12 months after PRK were -0.3 +/- 1.6D in group A, and -1.5 +/- 2.1D in group B. The percent of achieved correction within +/- 1.0D were 70.8% in group A, and 46.7% in group B 12 months after surgery. The epithelium healed by three days and there were no corneal erosions. Corneal haze (Grade 2 or more) was seen in 9.0% in group A and 36.4% in group B at 12 months after PRK. A planned double-pass PRK is a promising approach to correct high myopia (up to -10.50D), but long-term follow up will be required.

Keyword

excimer laser; high myopia; photorefractive keratectomy

MeSH Terms

Adult
Cornea/*surgery
Female
Humans
Lasers, Excimer
Male
Middle Aged
Myopia/*surgery
Photorefractive Keratectomy/*methods
Postoperative Complications
Refraction, Ocular
Visual Acuity
Wound Healing
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