• Rodolfo Mastropasqua, Rossella D'Aloisio, Luca Agnifili, Eduardo Zuppardi, Guido Di Marzio, Marta Di Nicola, Annamaria Porreca, Daniele Guarini, Michele Totta, Lorenza Brescia, and Luca Di Antonio.
• Vitreoretinal Unit, Bristol Eye Hospital, University of Bristol, Bristol BS8 1TH, UK.
• Medicina (Kaunas). 2020 Jan 20; 56 (1).

AbstractBackground and Objectives: the aim of the study was to evaluate the repeatability and reproducibility of optical microangiography (OMAG)-based optical coherence tomography angiography (OCTA) in the optic nerve head (ONH) and radial peripapillary capillary (RPC) perfusion assessment of healthy eyes. Materials and Methods: in this observational study, a total of 40 healthy subjects underwent ONH evaluation, using an OMAG-based OCTA system at baseline (T0), after 30 min (T1), and after 7 days (T2). The main outcome measures were the vessel density (VD) and flux index (FI) of the RPCs, as well as peri-papillary retinal nerve fibre layer (pRNFL) thickness. The analysis was performed by two observers independently. The coefficient of repeatability (CR), within the subject coefficient of variation (CVw) and intrasession correlation coefficient (ICC), to evaluate intrasession repeatability of measurements was calculated for each observer. Results: the high intrasession and intersession repeatability and reproducibility were assessed in the two observers for all three outcome measures. Of note, the CRs for the first and the second observer were 0.011 (95% confidence interval (CI) 0.009-0.014) and 0.016 (95% CI 0.013-0.020) for FI, 0.016 (95% CI 0.013-0.021) and 0.017 (95% CI 0.014-0.021) for VD, and 2.400 (95% CI 1.948-3.092) and 3.732 (95% CI 3.064-4.775) for pRNFL thickness, respectively. The agreement between them was excellent for pRNFL assessment and very good for FI and VD. Conclusion: OCTA has a great potential in the accurate assessment of ONH and peri-papillary microcirculation. It allows for repeated and reproducible measurements without multiple scans-related bias, thus guaranteeing an independent operator analysis with good reproducibility and repeatability.

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