Preliminary Characterization of Predictive Factors of the Visual Change after Epi-On and Epi-Off Corneal Collagen Crosslinking Techniques
Table 4
Differences between the epi-on and epi-off groups in the corneal topometric parameters in the different visits of the follow-up.
Mean (SD)
Preoperative
-value
Postoperative 3 months
-value
Postoperative 12 months
-value
Median (Range)
Epi-on
Epi-off
Epi-on
Epi-off
Epi-on
Epi-off
IHD
0.20 (0.14)
0.13 (0.07)
0.005
0.19 (0.12)
0.13 (0.07)
0.031
0.21 (0.16)
0.17 (0.15)
0.191
0.18 (0.88)
0.12 (0.35)
0.18 (0.67)
0.13 (0.32)
0.18 (0.67)
0.13 (0.71)
ISV
114.11 (34.63)
89.78 (41.90)
0.012
113.55 (36.10)
91.81 (36.63)
0.015
110.25 (40.96)
88.61 (39.80)
0.035
110.00 (149.00)
84.50 (193.00)
110.00 (144.00)
91.00 (180.00)
106.50 (147.00)
86.00 (191.00)
IVA
1.23 (0.47)
0.94 (0.59)
0.029
1.21 (0.49)
0.98 (0.53)
0.087
1.17 (0.52)
0.96 (0.56)
0.161
1.23 (1.72)
0.87 (2.76)
1.14 (1.72)
0.98 (2.52)
1.15 (1.64)
0.95 (2.65)
KI
1.32 (0.14)
1.24 (0.15)
0.037
1.31 (0.14)
1.24 (0.14)
0.035
1.31 (0.16)
1.23 (0.14)
0.058
1.33 (0.64)
1.22 (0.75)
1.33 (0.65)
1.23 (0.69)
1.29 (0.61)
1.24 (0.74)
Rmin (mm)
5.66 (0.62)
6.03 (0.66)
0.021
5.67 (0.61)
6.05 (0.63)
0.020
5.71 (0.69)
6.15 (0.70)
0.020
5.67 (2.70)
6.07 (2.46)
5.58 (2.67)
6.06 (2.34)
5.64 (2.85)
6.22 (2.67)
ARC (mm)
6.32 (0.63)
6.68 (0.55)
0.018
6.25 (0.59)
6.74 (0.53)
0.108
6.36 (0.65)
6.80 (0.61)
0.012
6.09 (2.40)
6.60 (2.04)
6.08 (2.42)
6.68 (2.04)
6.09 (2.37)
6.71 (2.34)
PRC (mm)
4.65 (0.58)
5.02 (0.56)
0.010
4.56 (0.52)
5.03 (0.50)
0.095
4.69 (0.63)
5.05 (0.52)
0.020
4.52 (2.44)
4.98 (2.17)
4.53 (2.19)
4.98 (1.91)
4.59 (2.52)
5.01 (2.09)
IHD, index of height decentration; ISV, index of surface variance; IVA, index of vertical asymmetry; KI, keratoconus index; Rmin, minimum radii of curvature; ARC, anterior average radius of curvature taken from the 3.0 mm optical zone centered on the thinnest point; PRC, posterior average radius of curvature taken from the 3.0 mm optical zone centered on the thinnest point.
