Skip to main content

Table 3 Comparison of vector parameters between the TransPRK and off-flap Epi-LASIK groups

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
TIA
 Magnitude (D) 0.91 ± 0.62 0.00, 2.67 0.90 ± 0.65 0.00, 3.06 .936
 Axis (degrees) 102.0 ± 75.6 1.0, 180.0 109.2 ± 72.8 1.0, 180.0 .698
SIA
 Magnitude (D) 1.12 ± 0.65 0.25, 2.75 1.21 ± 0.71 0.21, 3.06 .464
 Axis (degrees) 92.7 ± 75.5 1.1, 180.0 97.8 ± 74.7 1.0, 179.2 .796
Difference vector
 Magnitude (D) 0.43 ± 0.30 0.00, 1.00 0.48 ± 0.39 0.00, 1.49 .473
 Axis (degrees) 81.4 ± 52.2 0.00, 170.0 82.2 ± 55.6 0.00, 175.0 .953
Angle of Error (degrees) −1.5 ± 13.9 −38.9, 35.9 2.2 ± 13.2 −49.0, 72.1 .394
Correction index 1.32 ± 0.61 0.44, 3.19 1.45 ± 0.76 0.50, 3.90 .419
Index of success 0.53 ± 0.54 0.00, 1.99 0.65 ± 0.72 0.00, 3.05 .410
  1. TIA Target induced astigmatism, SIA Surgically induced astigmatism