Table 1.
Baseline and postoperative parameters of 490 eyes from 246 patients
| Characteristics | Aged 18–35 | n = 406 | Aged over 36a | n = 84 |
|---|---|---|---|---|
| Mean ± SD | Range | Mean ± SD | Range | |
| Age (years) | 24.15 ± 5.34 | (18 to 35) | 38.79 ± 2.76 | (36 to 46) |
| Right eyes/left eyes | 203:203 | 42:42 | ||
| Preoperative | ||||
| Sphere error (D) | − 4.49 ± 1.60 | (− 9.0 to − 0.25) | − 4.37 ± 1.48 | (− 8.25 to − 0.25) |
| Cylinder error (D) | − 0.91 ± 0.71 | (− 5.5 to 0) | − 0.74 ± 0.71 | (− 3.5 to 0) |
| Spherical equivalent refraction (D) | − 4.95 ± 1.62 | (− 9.75 to − 1.125) | − 4.74 ± 1.39 | (− 8.375 to − 2.0) |
| logMAR CDVA | 0 ± 0 | NA | 0 ± 0 | NA |
| CCT (µm) | 545.23 ± 27.38 | (487 to 636) | 541.95 ± 25.84 | (493 to 612) |
| Optical zone (mm) | 6.64 ± 0.14 | (6 to 6.7) | 6.67 ± 0.12 | (6.0 to 7.0) |
| Lenticule thickness (µm) | 107.28 ± 23.53 | (52 to 148) | 101.54 ± 21.48 | (55 to 141) |
| IOP (mmHg) | 15.06 ± 2.40 | (9.1 to 22.0) | 13.88 ± 2.08 | (8.9 to 19.2) |
| Postoperative | ||||
| Sphere error (D) | 0.25 ± 0.32 | (− 0.75 to 1.0) | 0.08 ± 0.37 | (− 1.0 to 1.25) |
| Cylinder error (D) | − 0.31 ± 0.27 | (− 1.5 to 0) | − 0.27 ± 0.24 | (− 1.0 to 0) |
| Spherical equivalent refraction (D) | 0.10 ± 0.34 | (− 1.0 to 1.0) | − 0.06 ± 0.37 | (− 1.125 to 1.0) |
| logMAR UDVA | − 0.04 ± 0.05 | (− 0.08 to 0.22) | − 0.03 ± 0.07 | (− 0.08 to 0.22) |
| logMAR CDVA | − 0.03 ± 0.05 | (− 0.08 to 0.15) | − 0.02 ± 0.04 | (− 0.08 to 0.09) |
| Efficacy index | 1.12 ± 0.12 | (0.6 to 1.2) | 1.08 ± 0.16 | (0.6 to 1.2) |
| Safety index | 1.07 ± 0.12 | (0.7 to 1.2) | 1.04 ± 0.10 | (0.8 to 1.2) |
Results are expressed as mean ± standard deviation (range)
CCT central corneal thickness, CDVA corrected-distance visual acuity, D diopter, logMAR logarithm of the minimum angle of resolution, SE spherical equivalent, UDVA uncorrected distance visual acuity, NA not available
aPatients aged over 36 years underwent 0.25–0.75 D undercorrection of sphere error during SMILE surgery