T reatment of Myopic Astigmatism using Erodible Mask: One Year Fo l l ow-up Results

ABSTRACT

After Photorefractive keratecto my[PRK]and Laser in situ keratomileusis[LASIK]for myopic astigmatism correction, we evaluated the change of myopic and astigmatic refraction and analyzed the results. Toric PRK[20 eyes]and Toric LASIK [45 eyes], total 65 eyes were performed using Toric PRK program of Summit Apex Plus and erodible mask and followed up for one year. We analyzed the change of uncorrected visual acuity, best corrected visual acuity, myopic refraction and astigmatic refraction.Mean spherical refraction had decreased from preoperative -4.36 +/-1.19D [PRK]&-8 .83 +/-2.20D[LASIK]to postoperative 12 month -0.25 +/-0.52D[PRK]&-0.21 +/-0.87D[LASIK].Cylindrical refraction had changed from preoperative -1.62 +/-1.09D[PRK]&-2.07 +/- 0.96D[LASIK]to postoperative 12 month -0.16 +/-0 .3 9 D [PRK]& 0.29 +/-0.69D[LASIK].Twelve months after Toric PRK, 64.0% of mean spherical equivalent was included within +/-0.5D and 92.0%was included within +/-1.0D.Twelve months after Toric LASIK, 57.5%of mean spherical equivalent was included within +/-0.5D and 77.5%was included within +/-1.0D.Uncorrected visual acuity was 0.7 or better in 100%of the Toric PRK group and 80.0%of the Toric LASIK group.No eyes in Toric PRK group lost two or more Snellen lines of best corrected visual acuity at postoperative 12 month, while 2 eyes[5.0%]in Toric LASIK group did. We concluded that myopic astigmatism correction using erodible mask was satisfactory.