Measuring corneal hysteresis: threshold estimation of the waveform score from the Ocular Response Analyzer.

Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie
Marcelo Ayala, Enping Chen

Abstract

The aim of this study was to determine a threshold waveform score (WS) for the best score value (BSV) in the Ocular Response Analyzer (ORA). Retrospective study. One hundred and thirty-three healthy adults were recruited. Measurements were done with the ORA 2.04. Two 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. When 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.

References

Feb 22, 2005·Journal of Cataract and Refractive Surgery·David A Luce
Jan 15, 2008·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Frank BochmannAugusto Azuara-Blanco
Mar 26, 2008·Journal of Cataract and Refractive Surgery·David TouboulJoseph Colin
Jun 4, 2008·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Michael Sullivan-MeeClifford Qualls
Nov 7, 2009·Acta Ophthalmologica·Olivia AbitbolDamien Gatinel
Feb 4, 2010·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Andrew K C LamJimmy Tse

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Citations

May 27, 2014·Journal of Cataract and Refractive Surgery·David P Piñero, Natividad Alcón
Jan 10, 2017·PloS One·Martin ZimmermannJoanna Wasielica-Poslednik
May 3, 2019·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Magdalena Asejczk-WidlickaBarbara Krystyna Pierscionek
Jul 6, 2019·Translational Vision Science & Technology·Masato MatsuuraRyo Asaoka

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Software Mentioned

STATA
ORA
Ocular Response Analyzer

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