Astigmatic Correction of LASIK.

Kim, Sang Jun; Lee, Jooyong; Tchah, Hungwon

Original Article

Journal of the Korean Ophthalmological Society 2001;42(7):967-971.
Published online July 1, 2001.

Astigmatic Correction of LASIK.

Sang Jun Kim, Jooyong Lee, Hungwon Tchah

Department of Ophthalmology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea.

LASIK 에 의한 난시의 교정 효과

김상준(Sang Jun Kim),이주용(Joo Yong Lee),차흥원(Hung Won Tchah)

Abstract

PURPOSE
The authors studied the results of excimer laser in situ keratomileusis for correction of myopic astigmatism. METHODS: The authors studied the results of 108 eyes(83 patients) who underwent excimer laser in situ keratomileusis for correction of myopic astigmatism and had preoperative atigmatism greater than 0.5 diopter(D). Each patient had been followed up for over 12 months since January 1996. Refractive errors, uncorrected visual acuity(UVA) and best corrected visual acuity(BCVA) were measured at postoperative 1, 3, 6 months and 1 year, respectively. And astigmatic changes were analyzed by vector analysis using the Holladay formula. RESULTS: Twenty-five patients were male; 58 were female. Mean spherical equivalent was -11.64 D +/-4.03 D preoperatively and -1.32 D+/-1.73 D at postoperative 1 year. In group I(31 eyes:0.50 D~0.75 D),II(46 eyes:1.00 D~1.75 D), III(15 eyes:2.00 D~2.75 D), IV(16 eyes:3.00 D~6.50 D), postoperative astigmatism were 0.60+/-0.73 D, 0.58+/-0.72 D, 0.75+/-0.89 D, 0.62+/-0.60 D at ostoperative 1 year. In 17.2% of all the eyes, axis deviation within 30 degrees was noted 1 year after the surgery. By vector analysis, astigmatic errors were corrected within 0.50 D of the attempted amount in 64.5% of group I, 63.0% of group II, 56.0% of group III and 66.7% of group IV. UVA was 0.5 or better in 69%, and 0.8 or better in 46% at postoperative 1 year. CONCLUSIONS: BCVA did not change after the surgery in most of the eyes. The greater the amount of preoperative astigmatism, the more effective the postoperative astigmatic correction

Key Words: Astigmatism;Laser in situ keratomileusis;Refraction;Visual acuity