Aims: To assess the test - retest variability of intraocular pressure (IOP) and ocular pulse amplitude (OPA) measurements utilising dynamic contour tonometry (DCT) and to evaluate possible influential factors. Methods: The study included 350 consecutive subjects (175 glaucoma, 175 control; one eye per subject) from seven European centres. IOP was measured once with a Goldmann applanation tonometer (GAT) and twice by DCT (DCT1, DCT2) in a randomised sequence. OPA was also recorded for both DCT measurements. Differences (DCT1-DCT2; OPA1-OPA2; GAT-DCT1; GAT-DCT2) were assessed using the t test. The intraclass coefficient of correlation (ICC) and coefficient of variation (CoV) for DCT and OPA were calculated. Results: DCT1 was 0.661.6 mmHg higher than DCT2 (p<0.001); OPA1 was 0.1±0.7 mm Hg higher than OPA2 (p=0.02). Results were not influenced by randomisation test order. In both glaucoma and normal subjects, DCT and OPA showed ICC>0.90 and >0.76, and CoV=4.8-5.0% and 10.3-10.5%, respectively. DCT1 and 2 were 2.4±2.6 and 1.8±2.6 mm Hg higher respectively than GAT (p<0.001). Discussion: DCT test - retest variability was almost perfect for IOP and good for OPA. Tonometry measurements with DCT tended to be overestimated compared with GAT.

Test - Retest variability of intraocular pressure and ocular pulse amplitude for dynamic contour tonometry: A multicentre study

Figus, M.;
2010

Abstract

Aims: To assess the test - retest variability of intraocular pressure (IOP) and ocular pulse amplitude (OPA) measurements utilising dynamic contour tonometry (DCT) and to evaluate possible influential factors. Methods: The study included 350 consecutive subjects (175 glaucoma, 175 control; one eye per subject) from seven European centres. IOP was measured once with a Goldmann applanation tonometer (GAT) and twice by DCT (DCT1, DCT2) in a randomised sequence. OPA was also recorded for both DCT measurements. Differences (DCT1-DCT2; OPA1-OPA2; GAT-DCT1; GAT-DCT2) were assessed using the t test. The intraclass coefficient of correlation (ICC) and coefficient of variation (CoV) for DCT and OPA were calculated. Results: DCT1 was 0.661.6 mmHg higher than DCT2 (p<0.001); OPA1 was 0.1±0.7 mm Hg higher than OPA2 (p=0.02). Results were not influenced by randomisation test order. In both glaucoma and normal subjects, DCT and OPA showed ICC>0.90 and >0.76, and CoV=4.8-5.0% and 10.3-10.5%, respectively. DCT1 and 2 were 2.4±2.6 and 1.8±2.6 mm Hg higher respectively than GAT (p<0.001). Discussion: DCT test - retest variability was almost perfect for IOP and good for OPA. Tonometry measurements with DCT tended to be overestimated compared with GAT.
Fogagnolo, Paolo; Figus, M.; Frezzotti, P.; Iester, M.; Oddone, F.; Zeppieri, M.; Ferreras, A.; Brusini, P.; Rossetti, L.; Orzalesi, N.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/933504
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