Table 3.
Repeatability for keratometry and pachymetry measurements in eyes with very severe corneal thinning versus severe corneal thinning.
| Parameter | Mean ± SD | Repeatability limit | CV (%) | ICC | ICC 95% CI |
|---|---|---|---|---|---|
| Very severe thinning with TCT ≤ 330 µm (n = 27) | |||||
| Kmax (D) | 81.29 ± 2.28 | 8.10 | 2.82 | 0.94 | 0.89–0.97 |
| K1A (D) | 65.85 ± 1.52 | 5.43 | 2.35 | 0.98 | 0.95–0.99 |
| K2A (D) | 70.17 ± 1.14 | 4.05 | 1.60 | 0.99 | 0.98–0.99 |
| K1P (D) | 10.27 ± 0.33 | 1.41 | 3.24 | 0.96 | 0.93–0.98 |
| K2P (D) | 11.34 ± 0.36 | 1.28 | 3.17 | 0.96 | 0.92–0.98 |
| ASTIG (D) | 5.28 ± 1.83 | 6.50 | 39.03 | 0.82 | 0.66–0.91 |
| TCT (µm) | 292.68 ± 17.01 | 57.72 | 5.74 | 0.86 | 0.71–0.93 |
| Severe thinning with TCT 331–400 µm (n = 87) | |||||
| Kmax (D) | 70.25 ± 1.18 | 5.63 | 1.64 | 0.99 | 0.98–0.99 |
| K1A (D) | 55.68 ± 0.57 | 3.11 | 1.04 | 0.99 | 0.99–0.99 |
| K2A (D) | 61.32 ± 0.69 | 2.93 | 1.15 | 0.99 | 0.99–0.99 |
| K1P (D) | 8.43 ± 0.18 | 0.87 | 2.22 | 0.98 | 0.97–0.99 |
| K2P (D) | 9.50 ± 0.19 | 0.87 | 1.98 | 0.98 | 0.97–0.98 |
| ASTIG (D) | 5.77 ± 0.72 | 2.49 | 18.44 | 0.97 | 0.96–0.98 |
| TCT (µm) | 374.66 ± 5.66 | 22.16 | 1.52 | 0.95 | 0.93–0.96 |
SD standard deviation, CV coefficient of variation, ICC intraclass correlation coefficient, D dioptre, K1A flat keratometry of anterior surface, K2A steep keratometry of anterior surface, K1P flat keratometry of posterior surface, K2P steep keratometry of posterior surface, ASTIG astigmatism, TCT thinnest corneal thickness.