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Table 2 Comparison of postoperative visual acuity and refractive errors in eyes that had transepithelial PRK or off-flap Epi-LASIK

From: Clinical outcomes of single-step transepithelial photorefractive keratectomy and off-flap epipolis-laser in situ keratomileusis in moderate to high myopia: 12-month follow-up

  Transepithelial PRK Off-flap Epi-LASIK P Value
Parameter Mean ± SD Range Mean ± SD Range
Refractive errors (D)
 Sphere 0.21 ± 0.33 −0.50, 1.00 0.33 ± 0.46 −0.50, 1.25 .218
 Cylindrical −0.43 ± 0.30 −1.00, 0.00 −0.48 ± 0.39 −1.50, 0.00 .584
 SE −0.01 ± 0.35 −0.88, 0.88 0.08 ± 0.42 −0.88, 1.00 .311
UDVA (logMAR) −0.05 ± 0.09 −0.20, 0.20 − 0.04 ± 0.08 −0.10, 0.20 .326
CDVA (logMAR) −0.06 ± 0.06 −0.10, 0.10 − 0.05 ± 0.06 −0.10, 0.10 .522
Efficacy index 1.13 ± 0.16 0.79, 1.26 1.11 ± 0.19 0.79, 1.41 .733
Safety index 1.15 ± 0.12 1.00, 1.26 1.14 ± 0.13 0.89, 1.41 .631
  1. SE Spherical equivalent, UDVA Uncorrected visual acuity, CDVA Corrected distance visual acuity, logMAR Logarithm of the minimum angle of resolution