Original Research

Repeatability of macular thickness measurements with the iVue-100 optical coherence tomographer

Nishanee Rampersad, Rekha Hansraj
African Vision and Eye Health | Vol 77, No 1 | a413 | DOI: https://doi.org/10.4102/aveh.v77i1.413 | © 2018 Nishanee Rampersad, Rekha Hansraj | This work is licensed under CC Attribution 4.0
Submitted: 10 July 2017 | Published: 26 March 2018

About the author(s)

Nishanee Rampersad, Discipline of Optometry, University of KwaZulu-Natal, South Africa
Rekha Hansraj, Discipline of Optometry, University of KwaZulu-Natal, South Africa


Share this article

Bookmark and Share

Abstract

Background: The reliability of an instrument is dependent on its accuracy and repeatability. The iVue-100 optical coherence tomographer (OCT) is a spectral domain device that has the advantage of being able to measure both the anterior and posterior segments of the eye. But its repeatability for macular thickness measurements has not been assessed and this was the primary purpose of this study.

Aim: To determine the repeatability of the iVue-100 OCT for macular thickness measurements.

Settings: This study was conducted at the University of KwaZulu-Natal.

Methods: Repeatability (intra-observer, inter-observer and inter-session) of the iVue-100 OCT was assessed on 50 participants selected using convenience sampling. Data were statistically analysed using Bland–Altman analysis, the intra-class correlation coefficient (ICC), coefficient of variation and the paired t-test.

Results: The mean age and standard deviation for the 50 participants were 23.88 ± 6.93 years (range 18–51 years). The ICCs for intra-observer repeatability ranged between 0.940 and 0.989, whereas the coefficients of variation ranged between 0.040 and 0.084. For both inter-observer and inter-session repeatability, the t-test showed no statistically significant differences (p > 0.05), and Bland–Altman analysis found the majority of the measurements to be within the 95% limits of agreement.

Conclusion: Irrespective of whether repeated measurements are being taken consecutively by the same examiner, by a different observer or at a different time, the iVue-100 OCT is highly reliable in terms of repeatability which is of paramount importance in any clinical or research setting.

Keywords

macular thickness; optical coherence tomography; repeatability; iVue-100 OCT

Metrics

Total abstract views: 146
Total article views: 117


Crossref Citations

No related citations found.