Figure 2. Superficial vascular complex (SVC) and deep vascular complex (DVC) of optical       coherence tomography angiography (OCT-A) with corresponding B scan by diabetic retinopathy       (DR) diagnosis. A-D: Indicate the SVC using 6 × 6 mm OCT-A images centered on the fovea        in representative patients with increasing levels of DR severity. E-H: Show the DVC of the        same eye with the same dimensions and DR. I-L: The color-coated map of the SVC area        illustrates the study finding that the whole and parafoveal VD of the SVC decreased with        increasing DR severity. M-P: Show the corresponding B scans for each level of DR severity       with no evidence of macular edema.