Simultaneous Transepithelial Topography-Guided Photorefractive Keratectomy and Accelerated Cross-Linking in Keratoconus: 2-Year Follow-Up
Table 7
Higher-order aberration values (4 mm) during follow-up.
Preoperative
1 month
3 months
6 months
12 months
24 months
HOA-RMS (m)
Mean±SD
1.04 ± 0.57
0.76 ± 0.58
0.61 ± 0.38
0.62 ± 0.39
0.64 ± 0.42
0.63 ± 0.41
Min/Max
0.15/2.58
0.18/2.28
0.15/1.84
0.15/1.84
0.16/1.95
0.16/1.80
p (preoperative)
-
0.153
<0.001
<0.001
<0.001
<0.001
p (previous)
-
-
0.141
0.763
0.982
0.027
COMA-RMS (m)
Mean±SD
0.91 ± 0.55
0.57 ± 0.50
0.45 ± 0.35
0.47 ± 0.35
0.50 ± 0.39
0.49 ± 0.38
Min/Max
0.10/2.35
0.06/1.69
0.03/1.64
0.03/1.64
0.03/1.69
0.03/1.52
p (preoperative)
-
0.024
<0.001
<0.001
<0.001
<0.001
p (previous)
-
-
0.240
<0.001
0.750
0.064
SA-RMS (m)
Mean±SD
0.19 ± 0.16
0.24 ± 0.29
0.11 ± 0.16
0.11 ± 0.16
0.13 ± 0.10
0.13 ± 0.10
Min/Max
0.01/0.71
0.01/1.04
−0.40/0.62
−0.40/0.62
0.00/0.44
0.02/0.45
p (preoperative)
-
0.687
0.087
0.073
0.008
0.006
p (previous)
-
-
0.101
0.645
0.820
0.518
SD: standard deviation; min: minimum; max: maximum; HOA-RMS: root-mean-square of total higher-order aberrations; Coma-RMS: root-mean-square of coma; SA-RMS: root-mean-square of spherical aberration. : compared to preoperative visit. : compared to previous visit.
