Table 1.
Pre-Operative Demographics and Postoperative ICL Vaults of the Study Participants
| Training Dataset | Internal Validation Dataset (Korean Patients) | External Validation (Japanese Patients) | P Value for Training Versus Internal Validation | P Value for Training Versus External Validation | |
|---|---|---|---|---|---|
| (N = 2756 eyes) | (N = 693 eyes) | (N = 290 eyes) | |||
| Age (y) | 24.82 ± 5.79 | 25.05 ± 5.89 | 32.45 ± 7.56 | 0.457 | <0.001 |
| Gender, female (%) | 1717 (62.3) | 442 (63.8) | 161 (55.5) | 0.472 | <0.001 |
| Spherical equivalent (Diopters) | −8.98 ±2.08 | −8.97 ± 2.25 | −7.11 ± 3.47 | 0.914 | <0.001 |
| Axial length (mm) | 27.05 ± 1.34 | 26.99 ± 1.62 | – | 0.628 | – |
| White-to-white (mm) | 11.69 ±0.34 | 11.71 ± 0.33 | 11.93 ± 0.44 | 0.255 | <0.001 |
| Angle-to-angle (mm) | 11.77 ± 0.35 | 11.81 ± 0.35 | 11.78 ± 0.38 | 0.072 | 0.723 |
| Anterior chamber depth (mm) | 3.36 ± 0.22 | 3.36 ± 0.23 | 3.26 ± 0.27 | 0.847 | <0.001 |
| Anterior chamber width (mm) | 11.90 ± 0.44 | 11.91 ± 0.43 | 11.80 ± 0.37 | 0.514 | <0.001 |
| Crystalline lens rise (µm) | −75.48 ± 166.02 | −60.61 ± 174.28 | 64.97 ± 194.63 | 0.096 | <0.001 |
| Central corneal thickness (µm) | 528.66 ± 35.22 | 525.53 ± 34.05 | 534.3 ± 30.14 | 0.068 | 0.020 |
| Pupil size (mm) | 6.64 ± 0.71 | 6.63 ± 0.70 | 3.10 ± 0.52 | 0.896 | <0.001 |
| ICL power (Diopters) | −10.84 ± 2.27 | −10.81 ± 2.34 | −7.79 ± 3.49 | 0.839 | <0.001 |
| Toric ICL (%) | 1072 (38.9) | 286 (41.3) | 135 (46.6) | 0.015 | |
| Achieved ICL size | 0.414 | <0.001 | |||
| 12.1 mm (%) | 1279 (46.4) | 335 (48.3) | 99 (34.1) | ||
| 12.6 mm (%) | 1301 (47.2) | 321 (46.3) | 152 (52.4) | ||
| 13.2 mm (%) | 175 (6.3) | 37 (5.2) | 38 (13.1) | ||
| 13.7 mm (%) | 1 (0.0) | 1 (0.1) | 1 (0.3) | ||
| Postoperative achieved ICL vault (µm) | 515.48 ± 170.73 | 514.39 ± 174.85 | 476.56 ± 249.06 | 0.905 | 0.004 |
ICL, implantable collamer lens.