Original Research
Repeatability of central and peripheral corneal thickness measurements with the iVue100 optical coherence tomographer
Submitted: 17 November 2015 | Published: 26 July 2016
About the author(s)
Nishanee Rampersad, Discipline of Optometry School of Health Sciences, University of KwaZulu-Natal, South AfricaRekha Hansraj, Discipline of Optometry School of Health Sciences, University of KwaZulu-Natal, South Africa
Abstract
Background: Accurate assessment of corneal thickness is essential in corneal refractive surgery, contact lens wear and corneal pathology.
Aim: To assess the repeatability (intra-observer, inter-observer and inter-session) of central (0 mm – 2 mm), mid-peripheral (2 mm – 5 mm) and peripheral (5 mm – 6 mm) corneal thickness measurements using the iVue 100 spectral domain optical coherence tomographer (SD-OCT).
Setting: Optometry Eye Clinic at the University of KwaZulu-Natal (UKZN).
Methods: Corneal thickness measurements were taken on 50 healthy participants by two observers independently. A second set of readings was taken by one observer on another session. Repeatability was assessed using Bland–Altman analysis, the intraclass correlation coefficient, coefficient of variation and one-way analysis of variance (ANOVA) analysis.
Results: For all corneal regions, the intraclass correlation coefficients for observer one ranged from 0.942 to 0.999 and that for observer two ranged from 0.946 to 0.999, indicating good intra-observer repeatability. Using linear regression, the corneal thickness measurements were found to be comparable (within 1 µm of each other) in all regions with the exception of the nasal and temporal mid-periphery and periphery. The inter-session repeatability was based on the measurements of observer one only with the mean differences ranging from 0.02 µm to 0.63 µm. Linear regression revealed no significant differences between session 1 and session 2 (p > 0.05) except for the measurement of minimum corneal thickness.
Conclusion: This study found evidence of good intra-observer, inter-observer and intersession repeatability of central, mid-peripheral and peripheral corneal measurements with the iVue 100 SD-OCT.
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Crossref Citations
1. Anterior segment optical coherence tomography scanning protocols and corneal thickness repeatability
Damien Fisher, Michael J. Collins, Stephen J. Vincent
Contact Lens and Anterior Eye vol: 43 issue: 5 first page: 433 year: 2020
doi: 10.1016/j.clae.2019.12.008