The choriocapillaris plus Sattler’s (CS) layer and the choroidal large vessel layer.

(A-D) Choroidal thickness of each layer. The bold yellow arrow indicates the choriocapillaris plus Sattler’s layer, the bold blue arrow the choroidal large vessel layer. Total subfoveal choroidal thickness is the sum of these two layers (between the yellow and blue arrows). (B1) The green line represents the bottom of the RPE, the two yellow arrows the thickness of the subfoveal choroid. (B2) This image is the expanded image of the yellow square portion of B1. (E) Early Treatment Diabetic Retinopathy Study (ETDRS) macular map sectors. The central area represents the fovea. Mean macular thickness was calculated for the superior (S), inferior (I), temporal (T), and nasal (N) areas, all for diameters of 1 mm, 3 mm, and 6 mm. We defined ‘C’ as the “mean foveal choroidal thickness area”, and each of the other four areas as follows: ‘S1+S2 = mean superior choroidal thickness area’, ‘I1+I2 = mean inferior choroidal thickness area’, ‘N1+N2 = mean nasal choroidal thickness area’, and ‘T1+T2 = mean temporal choroidal thickness area’.