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

Table 1

Baseline parameters of combined small-incision lenticular extraction (SMILE) and collagen cross-linking (SMILE Xtra) versus SMILE.

	SMILE Xtra	SMILE (control)	value
Age	28.1 ± 6.1	27.5 ± 5.2	0.966
Sex (male : female)	4 : 8	9 : 9	0.465
Sphere (diopter)	−6.59 ± 1.55	−6.05 ± 1.09	0.124
Cylinder (diopter)	−0.96 ± 0.72	−1.02 ± 0.47	0.567
Spherical equivalent refraction (diopter)	−7.08 ± 1.67	−6.56 ± 1.05	0.167
Mean keratometry (diopter)	43.71 ± 1.56	43.37 ± 1.28	0.396
Central corneal thickness (μm)	518 ± 39	545 ± 22	0.007

Mann-Whitney U test.
Fisher’s exact test, by subject.
Linear mixed model, by eye.
.