J Korean Ophthalmol Soc.  1996 Dec;37(12):2022-2030.

The Comparison between 5.0mm and 6.0mm Ablation Diameter in Surgical Result of Excimer Laser Photorefractive Keratectomy

• Lee SJ
• Kong BD
• Kim DC

Abstract

We analyzed the results of 5.0mm and 6.0mm ablation diameter in excimer laser photorefractive keratectomy using the same excimer laser (Aesculap-Meditec, MEL 60, Germany) In 5.0mm ablation diameter group, forty one eyes of thirty five patients were operated from March 1994 to February 1995 and in 6.0mm ablation diameter group, thirty eyes of twenty three patients were operated from July 1995 to December 1995. All were followed for at least 6 months and analyzed by retrospective method. Refractive change, naked visual acuity, corneal haze and night vision difficulties were measured at 1, 3, and 6 months postoperatively. In eyes treated with 6.0mm ablation diameter, the initial hyperopic shift was reduced with significant differences at 1 and 3 months (p<.01). In measurements of naked visual acuity and corneal haze, the results of 6.0mm zone were better than 5.0mm zone but the differences did not reach the statistical significance (p>.05). The subjective symptoms of night vision difficulty were significantly lower in the 6.0mm treatment group at 1 and 3 months (p=0. 0067, p=0.02). In conclusion, treatment with 6.0mm ablation diameter made less initial hyperopic shift and reduction of side effects in comparison with 5.0mm ablation diameter.

Keyword

Ablation diameter; Excimer laser photorefractive keratectomy; Myopia

MeSH Terms

Humans
Lasers, Excimer*
Myopia
Night Vision
Photorefractive Keratectomy*
Retrospective Studies
Visual Acuity