Fig. 2

PPCV was calculated using the trapezoidal rule integration method. The segment of retinal microcirculation scanned by DB OCTA was divided into several sub-spaces, with a slice interval of 6 μm. Retinal microcirculation volume in each sub-space was calculated approximately by MATLAB software. PPCV, peripapillary capillary volume; DB OCTA, dense B-scan optical coherence tomography angiography