Fig. 1

Control of normal eyes. a High-definition 9-mm horizontal B-scan designed to depict the intraretinal structure and subfoveal choroidal layers in a normal eye in greater detail. b Enhanced B-scan image with binarized processing of the subfoveal choroidal stroma and luminal vascular visualization of the subfoveal choroidal vessels to obtain the choroidal vascularity index (CVI). The red dotted line clearly delineated the selected subfoveal area. c Magnified image from the yellow insert depicts a choroidal vascularity index (CVI) of 69.8%, calculated within the area clearly delineated by the red dotted line. d A normal choriocapillaris flow area (CFA) of 2.348 mm² in the selected evaluation area of 3.142 mm²