Table 7.
Difference in eyes within ±0.5 D and ±1.0 D of the target refraction between different formulas.
| Paired group | P values | |
|---|---|---|
| ±1.0 D | ±0.5 D | |
| Haigis-SRK/T | 0.660 | 0.025 |
| Holladay-SRK/T | 0.002∗ | 0.001∗ |
| Hoffer Q-SRK/T | 0.001∗ | 0.006 |
| Holladay-Haigis | 0.000∗ | 0.000∗ |
| Hoffer Q-Holladay | 0.000∗ | 0.000∗ |
| Hoffer Q-Haigis | 0.000∗ | 0.000∗ |
| Barrett Universal II-SRK/T | 0.082 | 0.000∗ |
| Barrett Universal II-Haigis | 0.187 | 0.138 |
| Barrett Universal II-Holladay | 0.000∗ | 0.000∗ |
| Barrett Universal II-Hoffer Q | 0.000∗ | 0.000∗ |
∗Statistical significance; α = 0.005.