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 0.6+/-1.6 mm Hg 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 / P. Fogagnolo, M. Figus, P. Frezzotti, M. Iester, F. Oddone, M. Zeppieri, A. Ferreras, P. Brusini, L. Rossetti, N. Orzalesi. - In: BRITISH JOURNAL OF OPHTHALMOLOGY. - ISSN 0007-1161. - 94:4(2010 Apr), pp. 419-423. [10.1136/bjo.2009.165142]
Test-retest variability of intraocular pressure and ocular pulse amplitude for dynamic contour tonometry : a multicentre study
P. FogagnoloPrimo
;L. RossettiPenultimo
;N. OrzalesiUltimo
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 0.6+/-1.6 mm Hg 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 GATFile | Dimensione | Formato | |
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