Journal of the Korean Ophthalmological Society 2000;41(5):1132-1138.
Published online May 1, 2000.
Excimer Laser Photore fractive Keratectomy[PRK]for Low and Mode rate Myopia using VIXS STAR Excimer Laser System.
Nam Young Choi, Tae Won Hahn
Department of Ophthalmology, Kangnam St.Mary Hospital, The Catholic University Medical College, Seoul, Korea.
경도 및 중등도 근시에서 VISX STAR 기종을 이용한 엑시머 근시교정술의 결과
최남영(Nam Young Choi),한태원(Tae Won Hahn)
Abstract
Excimer laser photorefractive keratectomy[PRK]for low and moderate myopia[-2D~-6D]has been performed recently as a predictable and effective method for correcting myopia. We analyzed refractive change, postoperative visual acuity, and postoperative complications of 168 eyes[104patients]for 6 months and 33 eyes among them for 1 year after excimer PRK using VISX STAR excimer laser system from February 1997 to February 1998.Among the patients male were 8 patients, and female were 96patients.The myopic range was from-2.00 diopters[D]to -6.00D with astigmatism less than 3D.Uncorrected visual acuity of 4/5 or better was achieved in 91%postoperatively ;corrected visual acuity of 4/5 or better in 97%postoperatively.Eighty-eight eyes received spherical photorefractive keratectomy[PRK]to correct myopia ;80 eyes received photoastigmatic refractive keratectomy[PARK]to correct both myopia and astigmatism.In spherical PRK group the mean spherical equivalent was -4.67 +/-1.69D preopratively, 0.11 +/-0.93D 6 months after PRK, -0.31 +/-0.80D 1 year after PRK ;in photoastigmatic refractive keratectomy[PARK]group these figures were -4 .9 4 +/-1.42D, -0.37 +/-0.81D, -0.62 +/-0.78D, respectively.In the PARK group13.8%were undercorrected but in the spherical PRK group only 5.7% were undercorrected.So we report the ndercorrection rate of PARK group was relatively higher than that of spherical PRK group, but statisticallyinsignificant[Chi-Square test, p=0.075, but Relative Risk=2.65].We evaluated the surgically induced astigmatism by using both Jaffe and Clayman's vector-corrected methods.In the spherical PRK group the mean surgically induced astigmatism[SIA]was 0.83 +/-0.49D 6 months after PRK, 0.72 +/-0.47D 1 year after PRK ;in the PARK group these figures were 1.36 +/-0.71D, 1.29 +/-0.72D, respectively.The differences between the two groups were statistically significant[unpaired T-test.p=0.001].Astigmatism greater than 0.25D was reduced in 23.86%and induced in 55.68%of eyes that received spherical PRK and astigmatism greater than 0.25D was reduced in 80%and induced in 3.75%of eyes that received PARK.There were several complications including transient punctate keratopathies[6 eyes, 3.5%], undercorrection [-1D][16 eyes, 9.5%], and overcorrection[-1D][28 eyes, 16.67%].The decrease in the best corrected visual acuity in 10 eyes[5.9%] may be the result of a grade 2 or more corneal haze[15 eyes]and central island[2 eyes].
Key Words: Astigmatism;Photoastigmatic refractive keratectomy;Spherical photorefractive keratectomy;Surgically induced astigmatism


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