Reliability of Cyclotorsion measurements using Scanning Laser Ophthalmoscopy imaging in healthy subjects: the CySLO study.

Abstract

To evaluate inter-rater and intra-rater reliability of objective cyclotorsion measurements obtained in healthy subjects using the Heidelberg Spectralis spectral domain-optical coherence tomography (SD-OCT) device. In this prospective methodological study, 32 healthy subjects (14 men, 18 women; aged 21-64 years) were enrolled, 31 right eyes were examined and their foveo-papillary angles (FPAs) were measured. The retinal nerve fibre layer (RNFL) programme by Heidelberg Spectralis (Heidelberg Engineering, Heidelberg, Germany) was used to measure cyclotorsion based on the in-built algorithm for the measurement of the FPA on the scanning laser ophthalmoscopy (SLO) image. Repeated scans of the fixating and non-fixating right eye without and with eye tracker each were obtained by three different examiners. The mean FPA measured overall by all three examiners was 6.6°±2.8°. The inter-rater reliability of the measured FPAs using the linear mixed effects model is estimated as rho_inter=0.8803. The intra-rater reliability is estimated as rho_intra=0.9589. Repeatability of objective cyclotorsion measurements within and between observers using the Heidelberg Spectralis OCT is very high. SD-OCT/SLO imaging is a reliable imaging technique to measure and study cyclotorsion. NCT02631369, Results.