Research Article
Comparison of Long-Term Outcomes and Refractive Stability following SMILE versus SMILE Combined with Accelerated Cross-Linking (SMILE XTRA)
Table 1
Patient demographics and preoperative data.
| | Parameter (mean ± SD) | SMILE (n = 54) | SMILE XTRA (n = 54) | value |
| | Total no. of eyes | 54 | 54 | — | | Total no. of patients | 27 | 27 | — | | Male: female | 11 : 16 | 12 : 15 | — | | Age (years) | 25.96 ± 2.71 | 25.85 ± 4.06 | 0.90 | | Sphere (D) | −4.24 ± 1.84 | −4.036 ± 1.94 | 0.56 | | Cylinder (D) | −0.71 ± 0.68 | −0.95 ± 1.06 | 0.17 | | SE (D) | −4.61 ± 1.98 | −4.41 ± 1.89 | 0.57 | | CDVA (logMAR) | −0.06 ± 0.04 | −0.06 ± 0.05 | 0.85 | | K1 (D) | 42.67 ± 1.4 | 43.68 ± 1.77 | ≤0.001 | | K2 (D) | 43.68 ± 1.41 | 44.87 ± 1.54 | ≤0.001 | | Astigmatism (D) | 1.02 ± 0.55 | 1.19 ± 0.73 | 0.19 | | CCT (μ) | 527.88 ± 29.47 | 515.29 ± 26.45 | 0.02 | | Thinnest pachymetry (μ) | 523.83 ± 29.48 | 510.27 ± 26.84 | 0.01 |
| | VisuMax diagnostic and treatment data | | Sphere (D) | −4.43 ± 1.9 | −4.23 ± 2.01 | 0.58 | | Cylinder (D) | −0.80 ± 0.68 | −0.95 ± 1.1 | 0.39 | | Cap thickness (μ) | 120 ± 0 | 120 ± 0 | 1.00 | | Optical zone (μ) | 6.36 ± 0.30 | 6.27 ± 0.29 | 0.14 | | Minimum lenticule thickness (μ) | 16.85 ± 8.25 | 13.65 ± 6.42 | 0.02 | | Maximum lenticule thickness (μ) | 96.53 ± 22.90 | 87.48 ± 21.70 | 0.03 | | RST (μ) | 314.13 ± 31.30 | 303.75 ± 30.65 | 0.08 |
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UDVA: uncorrected distance visual acuity; D: diopter; SE: spherical equivalent; CDVA: corrected distance visual acuity; K: keratometry; CCT: central corneal thickness; RST: residual stromal thickness.
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