Table 1.
Slit Lamp Examination and Pentacam Results in Three Study Groups
| Group |
P-value |
||||||
|---|---|---|---|---|---|---|---|
| Parameters | Early keratoconus | Subclinical keratoconus | Control | control vs early keratoconus | Subclinical vs early keratoconus | Control vs Subclinical keratoconus | ANOVA |
| BCVA (log MAR)(Mean ± SD) | 0.25±0.27 | 0.02±0.05 | 0.03±0.07 | 0.00 | 0.00 | 0.99 | 0.00 |
| Spherical Equivalent(D) Mean ± SD | -4.84±2.52 | -3.0±2.24 | -4.12±1.83 | 0.54 | 0.04 | 0.28 | 0.04 |
| Cylinder(D) Mean ± SD | -3.83±2.10 | -2.10±1.66 | -1.10±1.00 | 0.00 | 0.01 | 0.18 | 0.00 |
| Steep meridian (degree) Mean ± SD | 95.35±31.94 | 83.23±13.22 | 87.84±23.79 | 0.61 | 0.34 | 0.85 | 0.32 |
| Steep K (D) Mean ± SD | 48.07±3.47 | 44.64±1.90 | 45.35±1.27 | 0.00 | 0.00 | 0.66 | 0.00 |
| Flat K (D) Mean ± SD | 42.92±2.21 | 44.24±1.63 | 46.11±2.83 | 0.00 | 0.05 | 0.24 | 0.06 |
| I-S diff(D) Mean ± SD | 6.93±6.23 | 1.35±1.98 | 0.07±0.60 | 0.00 | 0.00 | 0.58 | 0.00 |
| Post elevation (µm) Mean ± SD | 50.82±14.91 | 19.41±9.18 | 11.04±3.88 | 0.00 | 0.00 | 0.04 | 0.00 |
| Ant elevation (µm) Mean ± SD | 23.14±9.35 | 8.29±4.96 | 5.25±3.11 | 0.00 | 0.00 | 0.33 | 0.00 |
| Q value (Mean ± SD) | -0.76±0.31 | -0.40±0.14 | -0.32±0.12 | 0.00 | 0.00 | 0.49 | 0.00 |
| BAD-D (Mean ± SD) | 7.31±2.56 | 2.35±1.05 | 1.26±0.71 | 0.00 | 0.00 | 0.12 | 0.00 |
µm: Micrometer; SD: Standard Deviation; D: Diopter; I-S: Inferior-Superior; K: Keratometry reading; BAD-D: The Belin/Ambrósio enhanced ectasia display final 'D' index; BCVA: Best Corrected Visual Acuity; log MAR: Logarithm of the Minimum Angle of Resolution; VS: versus; ANOVA: Analysis of variance.