Measuring corneal hysteresis: threshold estimation of the waveform score from the Ocular Response AnalyzerReport as inadecuate




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Graefe-s Archive for Clinical and Experimental Ophthalmology

, Volume 250, Issue 12, pp 1803–1806

First Online: 09 May 2012Received: 10 January 2012Revised: 19 April 2012Accepted: 23 April 2012

Abstract

BackgroundThe aim of this study was to determine a threshold waveform score WS for the best score value BSV in the Ocular Response Analyzer ORA.

MethodsRetrospective study. One hundred and thirty-three healthy adults were recruited. Measurements were done with the ORA 2.04.

ResultsTwo hundred and sixty-six eyes were analyzed. Mean age was 56.49 ± 15.97 years. The mean waveform score of the BSV was 7.39 ± 1.32. The waveform scores ranged from 2.8 to 9.7. Kolmogorov–Smirnov test for normality was significant p ≤ 0.0001.

Linear regression showed a significant positive correlation between IOPg measured with the ORA and IOP measured with Goldmann applanation tonometry p ≤ 0.0001, as well as significant negative correlation between the difference IOPg–IOP Goldmann and waveform score of the BSV values. Threshold estimation considering 95 % confidence interval was 7.23. Meanwhile, threshold estimation considering the difference IOPg–IOP Goldmann, for 3 mmHg, was 6.7.

ConclusionsWhen using the ORA device, we recommend that clinicians try to obtain several waveform score measurements of 7 or above. Waveform scores lower than 7 may render less reliable results.

KeywordsWaveform score Ocular response analyzer Threshold  Download fulltext PDF



Author: Marcelo Ayala - Enping Chen

Source: https://link.springer.com/







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