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Table 4 Comparison of ocular higher-order aberrations and contrast sensitivity 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
Mean ± SD Range Mean ± SD Range
HOAs (um)
 Spherical 0.053 ± 0.120 0.001, 0.581 0.077 ± 0.206 0.001, 1.084 .348*
 Coma 0.118 ± 0.200 0.007, 0.963 0.156 ± 0.245 0.007, 1.069 .209*
 Trefoil 0.148 ± 0.205 0.019, 0.796 0.142 ± 0.150 0.021, 1.160 .802*
CS photopic
 3 cpd 1.76 ± 0.13 1.49, 1.93 1.74 ± 0.12 1.49, 2.08 .326
 6 cpd 2.03 ± 0.16 1.70, 2.29 2.02 ± 0.17 1.70, 2.29 .670
 12 cpd 1.73 ± 0.18 1.40, 1.99 1.72 ± 0.18 1.40, 1.99 .744
 18 cpd 1.31 ± 0.18 0.96, 1.55 1.30 ± 0.18 0.81, 1.55 .689
CS mesopic
 3 cpd 1.73 ± 0.13 1.49, 1.93 1.70 ± 0.11 1.49, 1.93 .155
 6 cpd 2.01 ± 0.14 1.70, 2.29 2.01 ± 0.17 1.70, 2.29 1.000
 12 cpd 1.69 ± 0.19 1.40, 1.99 1.68 ± 0.20 1.40, 1.99 .714
 18 cpd 1.25 ± 0.21 0.81, 1.55 1.26 ± 0.22 0.96, 1.55 .821
  1. HOA Higher-order aberration, CS Contrast sensitivity. *Mann-Whitney U test