Comparision of the Clinical Results in Photorefractive Keratectomy with that in Laser In Situ Keratomileusis for Correction of Moderate Myopia

Choi, Min Soo; Lee, Dong Ho; Lee, Ha Bum

Abstract

We have performed photorefractive keratectomy(PRK) and Laser In situ keratomileusis(LASIK) to compare the clinical results of PRK with that of LASIK in moderate myopes retrospectively. Of 70 eyes who were between -4.0 diopter and -8.0 diopter, there were 40 eyes, 33 patients treated by PRK and 30 eyes, 23 patients treated by LASIK. Follow-up evaluations were done at 1, 2, 3, 6, 9 months and uncorrected visual acuity, best corrected visual acuity, spherical equivalent, corneal haze, complications were analized. The postoperative uncorrected visual acuity was 0.72, 0.86, 0.86, 0.91, 0.85 in PRK and 0.86, 0.86, 0.83, 0.85, 0.82 in LASIK and the best corrected visual acuity was 0.94, 0.97, 0.97, 0.99 0.97 in PRK and 0.96, 0.97, 0.97, 0.97, 0.96 in LASIK respectively. Although the postoperative refractions within +/-1 diopter of emmetropia were 32.5% in PRK and 76.7% in LASIK and statistically significantly different between the two groups at 1 months(P<0.05), the difference was not significant(P>0.05) from 2 months. The average corneal haze was not significant(P>0.05) from 2 months. The average corneal haze was decreased from Grade 1.66 to Grade 0.48 in PRK at 1, 6 months but in LASIK, the corneal haze was low grade of Grade 0.35 from 1 month. The complications of PRK were irregular astigmatisms in 2 eyes and that of LASIK, the corneal haze was low irregular astigmatisms in 2 eyes and that of LASIK were interface particles in 3 eyes, irregular astigmatisms in 3 eyes. The clinical results of PRK and LASIK were satisfactory and the two technical methods were effective for correction of moderate myopes.