Corneal Safety and Stability in Cases of Small Incision Lenticule Extraction with Collagen Cross-Linking (SMILE Xtra)
Table 4
Corneal resistance factor and corneal densitometry along the postoperative follow-up period.
1 month
3 months
6 months
12 months
24 months
SMILE Xtra: CRF
9.72 ± 1.55
9.76 ± 1.63
9.77 ± 1.68
9.74 ± 1.77
9.72 ± 1.66
SMILE: CRF
9.12 ± 1.79
9.15 ± 1.65
9.20 ± 1.69
9.19 ± 1.70
9.22 ± 1.66
value
0.001
0.001
0.001
0.001
0.001
SMILE Xtra: Densitometry
24.11 ± 2.55
22.32 ± 2.14
20.16 ± 1.91
18.61 ± 1.85
18.42 ± 1.88
SMILE: Densitometry
17.41 ± 1.61
17.01 ± 1.66
16.91 ± 1.70
16.81 ± 1.61
16.80 ± 1.65
value
0.001
0.001
0.001
0.001
0.001
Values are expressed as mean ± SD. SD: standard deviation; CRF: corneal resistance factor; value compares mean of SMILE Xtra vs. SMILE using independent-samples t-test. Statistically significant.
