Agreement between tonometry methods: bias and 95% limits of agreement (or regression based equivalents)* either side of bias
| Tonometry method | Estimated bias | 95% limits of agreement |
|---|---|---|
| OBF, ocular blood flow; NCT, non-contact tonometer. | ||
| *GAT observer 1 was the reference for comparison. | ||
| †Difference between methods related to mean of methods. Bias and 95% limits of agreement calculated from linear regression of method differences against method mean. | ||
| Tono-Pen (mm Hg) | 0.6 | Bias ±6.5 |
| Goldmann observer 2 (mm Hg)† | 1.7–(0.12 × mean) | Bias ±2.6 |
| OBF (mm Hg)† | 6.0–(0.35 × mean) | Bias ±5.4 |
| NCT (mm Hg)† | 3.6–(0.17 × mean) | Bias ±4.8 |