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Abstract #28051 Published in IGR 13-1
Clinical evaluation of iCare rebound tonometer
Fan Y; Pan Y-Z; Zhu S-N; Li M; Qiao R-H; Cai Y; Fang Y; Liu L-N; Wang JChinese Ophthalmic Research 2010; 28: 1074-1077
Background: Intraocular pressure (IOP) measurement plays an important role in the diagnosis, classification and follow up of glaucoma patients. Though being a gold standard, Goldmann tonometer (GAT) shows its limitation in usage. ICare rebound tonometer (RBT) provides us a new method of IOP measurement, but its reproducibility and reliable is still not confirmed. Objective: The aim of this study was to evaluate the reliability and reproducibility of measurement of IOP with iCare RBT. Methods: Firstly, IOP was measured in 9 eyes of 9 normal volunteers using iCare RBT and GAT. The reproducibilitg of IOP readings by iCare RBT was evaluated. Secondly, IOP was measured with the iCare RBT in 45 eyes of 45 subjects with normal IOP by GAT respectively to compare the agreement of the two methods. Furthermore, IOP readings were obtained from another 13 eyes of 13 normal subjects by two operators with the same iCare RBT under the double-masked condition for the contrast of reproducibility of two operators. This trial was approved by the Ethics Committee of Peking University First Hospital. Written informed consent was obtained from each individual prior to any medical examination. Results: Intraclass correlation coefficient of the IOP readings obtained by iCare RBT and GAT were 0.821 (95% CI: 0.553-0.952) and 0.846 (95% CI: 0.604-0.959), respectively, showing a good reproducibility in iCare RBT and GAT measurement. IOP readings obtained by iCare RBT and GAT were (14.42 (plus or minus) 3.49) mmHg and (16.18 (plus or minus) 2.68) mmHg respectively, presenting a good correlation between the 2 measurement methods (r = 0.684, P < 0.001). However, a significant difference of IOP readings was found between the two methods (t = 4.601, P < 0.001). iCare RBT underestimated the IOP in comparison with GAT. Intraclass correlation coefficient of the IOP readings obtained by two operators were 0.827(95% CI: 0.626-0.938) and 0.697(95% CI: 0.413-0.884). Conclusion: The measuring results of iCare RBT and GAT have preferable correlation. A good reproducibility is proved in both iCare RBT and GAT methods. However, the reproducibility of the measurement by two different operators is not in accordance with each other. LA: Chinese
Y. Fan. Department of Ophthalmology, Peking University First Hospital, Ministry of Education, Beijing 100034, China. panyingzi99@yahoo.com.cn
Classification:
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)