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

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

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

HOAs = higher order aberrations; RMS = root mean square
P: Paired t test; P*: Student’s t-test; Values in bold are significant (P < 0.05)

ISSN: 2326-0254