Table 4.
Summary of correlations between different corneal power and eccentricity parameters and their within-subject standard deviation (Sw) associated.
| Correlation Pearson coefficient | p value | |
|---|---|---|
| K flat (mm) | 0.269 | 0.005 |
| K steep (mm) | 0.178 | 0.066 |
| K M (mm) | 0.276 | 0.004 |
| K AST (D) | −0.077 | 0.431 |
| K ASTAX (degrees) | 0.052 | 0.597 |
| e | −0.244 | 0.011 |
| 3Kflat (mm) | 0.125 | 0.200 |
| 3Ksteep (mm) | 0.053 | 0.588 |
| 3KM (mm) | 0.140 | 0.151 |
| 3KAST (D) | 0.269 | 0.005 |
| 3KASTAX (degrees) | −0.051 | 0.603 |
| 5Kflat (mm) | 0.215 | 0.026 |
| 5Ksteep (mm) | 0.129 | 0.184 |
| 5KM (mm) | 0.240 | 0.013 |
| 5KAST (D) | 0.218 | 0.024 |
| 5KASTAX (degrees) | 0.133 | 0.173 |
| 7Kflat (mm) | 0.166 | 0.087 |
| 7Ksteep (mm) | 0.207 | 0.033 |
| 7KM (mm) | −0.128 | 0.189 |
| 7KAST (D) | 0.125 | 0.201 |
| 7KASTAX (degrees) | 0.075 | 0.445 |
SD, standard deviation; keratometric flattest (Kflat) and steepest (Ksteep) corneal radius, mean keratometric corneal radius (KM), and mean keratometric astigmatism (KAST) and its axis (KASTAX), corneal eccentricity (e), flattest (3Kflat) and steepest (3Ksteep) corneal radius, mean corneal radius (3KM), and mean astigmatism (3KAST) and its axis (3KASTAX) in a 3 mm central zone, flattest (5Kflat) and steepest (5Ksteep) corneal radius, mean corneal radius (5KM), and mean astigmatism (5KAST) and its axis (5KASTAX) in a 5 mm central zone, and flattest (7Kflat) and steepest (7Ksteep) corneal radius, mean corneal radius (7KM), and mean astigmatism (7KAST) and its axis (7KASTAX) in a 7 mm central zone.