Xu X, et al. - Through a cross-sectional pilot study, the researchers intended to propose a simple method for differentiation of the retinal veins from arteries on optical coherence tomography angiography (OCTA). Color depth encoded, greyscale full-thickness retina, superficial plexus, and deep capillary plexus from 9 3x3 mm and 9 6x6 mm OCTA scans were 4 exported and aligned default en face slabs. Significant improvement in grading performance at each stage was observed. Between accuracy and time spent grading or between accuracy and years in practice, no significant correlation could be assessed. Hence, a simple procedure for precise discrimination of retinal arteries from veins on OCTA which included the use of vortices in the deep capillary plexus for the recognition of the venous origin was reported.