Optical coherence tomography angiography (OCTA) images demonstrate macular capillary nonperfusion and vascular tortuosity in diabetic eyes. The foveal avascular zone diameters in these images increase with worsening diabetic retinopathy severity level. A, Nondiabetic eye. B, Mild nonproliferative diabetic retinopathy (NPDR). C, Moderate NPDR. D, Proliferative diabetic retinopathy (PDR)