BACKGROUND/AIMS: Choroidal thickness measurements are reported to differ between spectral‑domain optical coherence tomography (SD‑OCT) and swept‑source OCT (SS‑OCT). The aim of this study was to assess the comparability of choroidal thickness measurements using SS‑OCT and SD‑OCT devices among normal participants. MATERIALS AND METHODS: This was a prospective study of 31 (62 eyes) normal participants. Choroidal imaging was performed sequentially with the Spectralis OCT (SD‑OCT) and the deep range imaging OCT (DRI OCT‑1) (SS‑OCT) using standardized imaging protocols. The subfoveal choroidal thickness (SFChT) was measured manually by two masked retinal specialists. Paired t‑tests and intraclass correlation coefficients (ICCs) were used to compare the measurements. RESULTS: The mean SFChT was 319.5 μm and 325.3 μm for DRI OCT‑1 and Spectralis OCT, respectively (P = 0.001), with a mean difference of 5.9 with ICC of 0.97. The mean difference in choroidal thickness between the OCT devices was larger among eyes with choroidal thickness > 350 μm compared with eyes with thinner choroids (8.0 μm vs. 4.7 μm). CONCLUSIONS: SFChT measurements are comparable between DRI OCT‑1 and Spectralis OCT. The variability between the devices increases in thicker choroids.

BACKGROUND/AIMS: Choroidal thickness measurements are reported to differ between spectral‑domain optical coherence tomography (SD‑OCT) and swept‑source OCT (SS‑OCT). The aim of this study was to assess the comparability of choroidal thickness measurements using SS‑OCT and SD‑OCT devices among nor...