Fig. 1.

The morphological patterns of the neovascular membranes on the optical coherence tomography angiography en face projection image. The membrane was identified as sea-fan if >90% of the membrane radiated from one side of the lesion with presence of numerous tiny branching capillaries from the center to the periphery with or without arteriovenous anastomotic loops, or a peripheral arcade of small anastomotic and looping vessels (a). The membrane was identified as medusa if the vessels branched in all directions from the center of the lesion with presence of numerous tiny branching capillaries from the center to the periphery with or without arteriovenous anastomotic loops, or a peripheral arcade of small anastomotic and looping vessels (b). Membranes lacking such distinct membrane morphology but with branching small-capillary networks with or without arteriovenous anastomotic loops and the peripheral arcade of small anastomotic and looping vessels were determined to be ill-defined (c). The membrane was identified as long filamentous if the membrane had a dead-tree or pruned-vascular-tree pattern with long dilated filamentous linear vessels without branching small-capillary networks (d)