Table 2.
The anterior segment optical coherence tomography (AS-OCT) parameters in normal, forme fruste keratoconus (FFKC), and keratoconic eyes.
| Normal | FFKC | KC | N vs. FFKC | ||
|---|---|---|---|---|---|
| (n = 25) | (n = 14) | (n = 23) | (P-value) | ||
| Keratometry | Ks (D) | 43.41 | 43.65 | 54.62 | 0.36 |
| Kf (D) | 42.28 | 42.00 | 50.50 | 0.86 | |
| Avg. K (D) | 42.84 | 42.83 | 52.56 | 0.60 | |
| Pachymetry | Center (μm) | 539.76 | 501.71 | 436.22 | <0.01 |
| Thinnest (μm) | 535.76 | 493.07 | 411.61 | <0.01 | |
| Anterior BFS | 5 mm (mm) | 7.88 | 7.89 | 6.41 | 0.58 |
| 6 mm (mm) | 7.90 | 7.90 | 6.61 | 0.49 | |
| 7 mm (mm) | 7.92 | 7.91 | 6.80 | 0.40 | |
| Posterior BFS | 5 mm (mm) | 6.61 | 6.51 | 5.03 | 0.28 |
| 6 mm (mm) | 6.62 | 6.53 | 5.28 | 0.21 | |
| 7 mm (mm) | 6.65 | 6.56 | 5.52 | 0.27 | |
FFKC: forme fruste keratoconus, KC: keratoconus, N: Normal, Ks: steep keratometry, Kf: flat keratometry, Avg. K: average keratometry, BFS: best-fit sphere.