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Table 3 Preoperative and 12-month postoperative corneal high order aberrations

From: Different accelerated corneal collagen cross-linking treatment modalities in progressive keratoconus

HOAs 6-mm Group 1
n = 37
Group 2
n = 29
P
Total (RMS, μm)
 Preoperative 4.60 ± 2.0 4.66 ± 2.06 0.82
 12 months postoperative 4.12 ± 1.78 4.08 ± 2.01 0.68
 Mean difference 0.48 ± 0.26 0.58 ± 0.30 0.08
 P* 0.04 0.04  
Spherical (RMS, μm)
 Preoperative 0.56 ± 0.38 0.58 ± 0.46 0.72
 12 months postoperative 0.48 ± 0.41 0.49 ± 0.37 0.80
 Mean difference 0.08 ± 0.06 0.08 ± 0.05 0.81
 P* 0.02 0.01  
Coma (RMS, μm)
 Preoperative 4.28 ± 2.06 4.44 ± 1.92 0.16
 12 months postoperative 3.82 ± 1.95 3.76 ± 1.81 0.32
 Mean difference 0.46 ± 0.18 0.68 ± 0.21 0.04
P* 0.02 < 0.01  
Trefoil (RMS, μm)
 Preoperative 0.56 ± 0.36 0.59 ± 0.42 0.60
 12 months postoperative 0.42 ± 0.38 0.44 ± 0.40 0.42
 Mean difference 0.14 ± 0.09 0.15 ± 0.10 0.22
 P* 0.03 0.02  
  1. HOAs = higher order aberrations; RMS = root mean square
  2. P: Paired t test; P*: Student’s t-test; Values in bold are significant (P < 0.05)