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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