Table 1 IOP measurement variance and accuracy with the CATS and GAT prisms in cadaver eyes
From: Goldmann and error correcting tonometry prisms compared to intracameral pressure
Overall accuracy/repeatability | Parameter | 5 mmHg | 10 mmHg | 20 mmHg | 30 mmHg | 40 mmHg | 50 mmHg | 60 mmHg |
|---|---|---|---|---|---|---|---|---|
GAT reference prism | Mean IOP meas. | 1.1 | 7.6 | 17.7 | 27.8 | 38.0 | 47.0 | 54.1 |
Std. Dev. | 1.2 | 3.6 | 1.5 | 2.2 | 1.1 | 3.6 | 2.6 | |
Coeff. of Variation | 1.1 | 0.5 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | |
Accuracy (error to transducer IOP) | −4.0 | −2.5 | −2.3 | −2.3 | −2.6 | −2.5 | −5.5 | |
CATS prism | Mean IOP meas. | 3.0 | 7.1 | 19.2 | 29.0 | 41.1 | 48.4 | 55.0 |
Std. Dev. | 1.7 | 4.0 | 2.2 | 2.6 | 1.2 | 1.2 | 1.6 | |
Coeff. of Variation | 0.6 | 0.6 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | |
Accuracy (error to transducer IOP) | −2.1 | −3.0 | −0.5 | −0.9 | 0.4 | −1.1 | −4.3 |