Fig. 1

Measuring radial peripapillary capillaries (RPC) vessel density (VD) based on Garway-Heath’s map. (Left) The representative 4.5 mm × 4.5 mm en face OCT angiography image is centered on optic nerve head. The peripapillary area is overlaid by annular contour lines with 2 mm and 4 mm diameter around disc margin. The peripapillary area is further divided into eight sectors according to Garway-Heath’s map. (Right) The built-in software automatically calculates RPC VD based on Garway-Heath’s map. The global RPC VD (arrow) is measured from the 360-degree annular peripapillary area. The RPC VD of the superior (asterisk) and inferior (triangle) hemifield is measured from the superior four sectors and the inferior four sectors, respectively