Comparison of Long-Term Outcomes and Refractive Stability following SMILE versus SMILE Combined with Accelerated Cross-Linking (SMILE XTRA)

Table 3

Visual and refractive parameters 2 weeks post-op versus mean follow-up in the SMILE group.

Parameter (mean ± SD)	Post-op 2 weeks	Last follow-up	value
UDVA (logMAR)	−0.07 ± 0.04	−0.05 ± 0.07	0.23
Sphere (D)	−0.00 ± 0.03	−0.037 ± 0.14	0.10
Cylinder (D)	−0.00 ± 0.05	−0.09 ± 0.20	0.002
SE (D)	−0.00 ± 0.05	−0.08 ± 0.18	0.003
CDVA (logMAR)	−0.08 ± 0.05	−0.08 ± 0.06	1.00
K1 (D)	39.58 ± 1.72	39.63 ± 1.61	0.88
K2 (D)	40.36 ± 1.71	40.44 ± 1.62	0.79
Corneal astigmatism (D)	0.77 ± 0.39	0.82 ± 0.39	0.46
CCT (μ)	449.31 ± 30.32	455.33 ± 29.57	0.29
Thinnest pachymetry (μ)	446.83 ± 29.77	453.01 ± 29.23	0.27

UDVA: uncorrected distance visual acuity; D: diopter; SE: spherical equivalent; CDVA: corrected distance visual acuity; K: keratometry; CCT: central corneal thickness.