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

Table 4

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

Parameter (mean ± SD)	Post-op 2 weeks	Last follow-up	value
UDVA (logMAR)	−0.08 ± 0.13	−0.06 ± 0.08	0.24
Sphere (D)	0.00 ± 0.00	−0.062 ± 0.25	0.08
Cylinder (D)	−0.00 ± 0.03	−0.15 ± 0.28	≤0.001
SE (D)	−0.00 ± 0.01	−0.13 ± 0.33	0.005
CDVA (logMAR)	−0.08 ± 0.13	−0.07 ± 0.06	0.63
K1 (D)	40.34 ± 2.00	40.50 ± 2.03	0.67
K2 (D)	41.10 ± 2.06	41.44 ± 2.02	0.38
Corneal astigmatism (D)	0.79 ± 0.34	0.84 ± 0.40	0.49
CCT (μ)	435.20 ± 23.96	442.85 ± 26.65	0.11
Thinnest pachymetry (μ)	433.87 ± 24.88	440.35 ± 25.97	0.19

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