Figure 2. Optical coherence tomography-derived measurements of choroidal thickness and large and medium vessel thickness. Measurements of choroidal thickness performed at the fovea and loci 750 μm nasal and temporal to the fovea (a, b and c, respectively), as well as large vessel choroidal thickness (d, e and f, respectively) and medium vessel choroidal thickness (g, h and i, respectively). Eyes with acute (black) and chronic central serous retinopathy (dark grey) and controls (light grey) are included for all layers and measurement locations. Statistical analysis of subgroup thickness measurements (generalized estimating equation, one-way analysis of variance, post-hoc Tukey's test *P < 0.05, **P < 0.001, ***P < 0.0001).