Table 2. Differences of 3-month postoperative minus preoperative measurements.
| Parameter | Mean ± SD [Range] | P-value | |
|---|---|---|---|
| LASIK (n = 52) | SMILE (n = 52) | ||
| Δ Corneal volume (mm³) | |||
| 3-mm diameter region | -0.40 ± 0.21 | -0.50 ± 0.15 | .001 |
| [-0.9 to 0.0] | [-0.7 to 0.0] | ||
| 5-mm diameter region | -0.95 ± 0.49 | -1.21 ± 0.34 | .001 |
| [-2.2 to 0.0] | [-1.7 to -0.1] | ||
| 7-mm diameter region | -1.33 ± 0.81 | -1.77 ± 0.55 | .001 |
| [-3.4 to 0.3] | [-2.8 to 0.1] | ||
| 10-mm diameter region | -1.35 ± 1.31 | -1.78 ± 1.09 | .066 |
| [-4.2 to 1.8] | [-4.8 to 1.5] | ||
| Δ Corneal thickness (μm) | |||
| Apex | -62.00 ± 30.54 | -77.12 ± 20.92 | .002 |
| [-140 to -4] | [-110 to -12] | ||
| 2-mm diameter region | -57.82 ± 27.95 | -70.69 ± 19.81 | .003 |
| [-126 to -4] | [-99 to -9] | ||
| 4-mm diameter region | -42.55 ± 22.26 | -54.19 ± 15.94 | .001 |
| [-99 to 1] | [-79 to -4] | ||
| 6-mm diameter region | -17.94 ± 15.06 | -25.19 ± 11.17 | .009 |
| [-53 to 20] | [-50 to 8] | ||
| 8-mm diameter region | -0.80 ± 12.80 | -3.13 ± 12.05 | .418 |
| [-7 to 30] | [-31 to 28] | ||
LASIK = laser-assisted in situ keratomileusis; SD = standard deviation; SMILE = small-incision lenticule extraction; Δ = 3-month postoperative minus preoperative.