Table 2.
Comparisons of the postoperative corneal cylindrical errors among simulated keratometry (simKa), true net power (TNPa), and total corneal refractive power (TCRPa) from 1 mm to 8 mm. All values were adjusted for the corneal plane using a vertex distance of 12 mm.
| Vector means | Difference | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| simKa | TNPa | TCRPa | TCRPa versus simKa | TCRPa versus TNPa | simKa versus TNPa | ||||
| Magnitude∗ | |Angle|∗∗ | Magnitude∗ | |Angle|∗∗ | Magnitude∗ | |Angle|∗∗ | ||||
| 1 mm | (0.25 ± 0.62) × 75.2 | (0.21 ± 0.70) × 36.9 | (0.20 ± 0.69) × 39.2 | 0.27 ± 0.19 | 10.5 ± 13.2 | 0.02 ± 0.09 | 1.3 ± 6.1 | 0.29 ± 0.18 | 9.9 ± 11.6 |
| 2 mm | (0.49 ± 0.56) × 83.8 | (0.24 ± 0.61) × 69.7 | (0.24 ± 0.61) × 69.2 | 0.30 ± 0.15 | 12.0 ± 14.9 | 0.01 ± 0.08 | 1.3 ± 8.2 | 0.30 ± 0.15 | 11.2 ± 12.7 |
| 3 mm | (0.71 ± 0.47) × 89.6 | (0.46 ± 0.48) × 88.6 | (0.46 ± 0.49) × 88.3 | 0.25 ± 0.12 | 11.4 ± 15.7 | 0.01 ± 0.05 | 0.6 ± 0.9 | 0.25 ± 0.12 | 11.2 ± 15.5 |
| 4 mm | (0.92 ± 0.47) × 92.3 | (0.74 ± 0.49) × 93.2 | (0.75 ± 0.50) × 93.4 | 0.18 ± 0.12 | 6.1 ± 10.4 | 0.01 ± 0.04 | 0.6 ± 0.9 | 0.19 ± 0.12 | 5.8 ± 9.8 |
| 5 mm | (1.07 ± 0.52) × 94.0 | (0.93 ± 0.51) × 94.6 | (0.98 ± 0.54) × 94.9 | 0.10 ± 0.13 | 3.5 ± 5.9 | 0.05 ± 0.05 | 0.6 ± 1.0 | 0.14 ± 0.12 | 3.2 ± 5.2 |
| 6 mm | (1.16 ± 0.68) × 95.8 | (1.07 ± 0.67) × 95.7 | (1.17 ± 0.74) × 96.0 | 0.01 ± 0.14 | 3.3 ± 4.8 | 0.10 ± 0.08 | 0.8 ± 1.3 | 0.09 ± 0.11 | 2.7 ± 3.9 |
| 7 mm | (1.15 ± 0.84) × 97.5 | (1.14 ± 0.85) × 96.5 | (1.31 ± 1.00) × 96.7 | 0.17 ± 0.25 | 4.5 ± 7.2 | 0.17 ± 0.17 | 1.1 ± 1.8 | 0.04 ± 0.15 | 3.7 ± 6.5 |
| 8 mm | (1.09 ± 0.93) × 98.2 | (1.19 ± 0.98) × 96.4 | (1.44 ± 1.25) × 97.6 | 0.35 ± 0.47 | 5.8 ± 11.3 | 0.26 ± 0.39 | 3.7 ± 10.9 | 0.12 ± 0.15 | 2.9 ± 4.1 |
∗Magnitude represented the magnitude of the vector difference.
∗∗|Angle| was defined as the mean absolute values of the arithmetic difference between the axis of two corneal astigmatisms. It was defined always to be an acute angle.