Comparison of the Early Clinical Outcomes between Combined Small-Incision Lenticule Extraction and Collagen Cross-Linking versus SMILE for Myopia

Table 2

The safety indices (postoperative CDVA/preoperative CDVA) and efficacy indices (postoperative UDVA/preoperative CDVA) of both groups at postoperative months 1, 3, and 6.

	Month 1	Month 3	Month 6
Safety index
SMILE Xtra	0.95 ± 0.08	0.95 ± 0.06	0.96 ± 0.06
SMILE	1.03 ± 0.09	1.00 ± 0.04	1.00 ± 0.00
value	0.004	0.005	<0.001
Efficacy index
SMILE Xtra	0.89 ± 0.11	0.89 ± 0.10	0.88 ± 0.13
SMILE	0.96 ± 0.08	0.98 ± 0.07	0.97 ± 0.06
value	0.013	0.001	0.005

Linear mixed model analysis.