Table 1.
Intraobserver repeatability outcomes for biometric measurements obtained using AL-Scan partial coherence interferometry in children.
| Parameter | observer | Mean ± SD | Sw | TRT | CoV (%) | ICC |
|---|---|---|---|---|---|---|
| AL (mm) | 1st | 23.83 ± 1.22 | 0.03 | 0.09 | 0.14 | 0.999 |
| 2nd | 23.82 ± 1.22 | 0.03 | 0.09 | 0.14 | 0.999 | |
| CCT (μm) | 1st | 547.40 ± 31.97 | 1.81 | 5.01 | 0.33 | 0.997 |
| 2nd | 547.42 ± 31.98 | 1.79 | 4.95 | 0.33 | 0.997 | |
| ACD (mm) | 1st | 3.81 ± 0.20 | 0.01 | 0.04 | 0.34 | 0.995 |
| 2nd | 3.82 ± 0.20 | 0.01 | 0.03 | 0.30 | 0.997 | |
| Kf (D) | 1st | 43.76 ± 1.54 | 0.10 | 0.27 | 0.23 | 0.996 |
| 2nd | 43.77 ± 1.54 | 0.10 | 0.28 | 0.23 | 0.997 | |
| Ks (D) | 1st | 42.47 ± 1.43 | 0.09 | 0.24 | 0.20 | 0.996 |
| 2nd | 42.50 ± 1.44 | 0.08 | 0.23 | 0.19 | 0.996 | |
| Km (D) | 1st | 43.11 ± 1.44 | 0.08 | 0.21 | 0.17 | 0.997 |
| 2nd | 43.13 ± 1.44 | 0.08 | 0.21 | 0.18 | 0.997 | |
| Astigmatism | 1st | 1.28 ± 0.80 | 0.11 | 0.30 | 8.54 | 0.982 |
| 2nd | 1.28 ± 0.83 | 0.11 | 0.29 | 8.28 | 0.984 | |
| J0 (D) | 1st | −0.61 ± 0.40 | 0.05 | 0.15 | — | 0.981 |
| 2nd | −0.61 ± 0.41 | 0.06 | 0.15 | — | 0.982 | |
| J45 (D) | 1st | 0.06 ± 0.21 | 0.06 | 0.16 | — | 0.928 |
| 2nd | 0.06 ± 0.20 | 0.05 | 0.13 | — | 0.946 | |
| CD (mm) | 1st | 12.08 ± 0.35 | 0.14 | 0.38 | 1.12 | 0.862 |
| 2nd | 12.05 ± 0.35 | 0.14 | 0.39 | 1.15 | 0.859 | |
| PD | 1st | 7.94 ± 0.59 | 0.08 | 0.22 | 1.00 | 0.982 |
| 2nd | 7.96 ± 0.57 | 0.07 | 0.20 | 0.90 | 0.984 |
AL = axial length, CCT = central corneal thickness, ACD = anterior chamber depth, Kf = flattest keratometry, Ks = steepest keratometry, Km = mean keratometry, CD = corneal diameter, SD = standard deviation, Sw = within-subject standard deviation, TRT = test-retest repeatability (2.77 Sw), CoV = within-subject coefficient of variation, ICC = intraclass correlation coefficient.