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Table 1 Baseline characteristics of 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 −6.03 ± 1.97 −9.50, −2.50 − 6.18 ± 2.01 −9.75, − 2.50 .363
 Cylindrical −1.09 ± 0.72 −3.00, 0.00 − 1.03 ± 0.73 − 3.50, 0.00 .616
 SE −6.57 ± 2.01 −10.00, − 2.88 − 6.67 ± 1.99 − 10.25, − 2.88 .519
UDVA (logMAR) 1.07 ± 0.22 0.50, 1.60 1.08 ± 0.23 0.50, 1.60 .730
CDVA (LogMAR) −0.003 ± 0.05 −0.10, 0.10 0.003 ± 0.04 −0.10, 0.10 .423
CCT (um) 498.78 ± 23.81 465.00, 570.00 499.00 ± 22.53 462.00, 556.00 .789
Total ablation zone (mm) 7.95 ± 0.32 6.70, 8.44 7.47 ± 0.26 6.89, 8.14 <.001
Optical zone (mm) 6.30 ± 0.32 5.80, 7.00 6.30 ± 0.35 5.80, 7.00 .872
Stromal ablation depth (um) 99.58 ± 23.18 44.00, 133.00 101.19 ± 19.40 61.00, 129.00 .232
  1. SE Spherical equivalent, UDVA Uncorrected distance visual acuity, CDVA Corrected distance visual acuity, logMAR Logarithm of the minimum angle of resolution, CCT Central corneal thickness