Diabetic retinopathyDiabetic macular ischemiaFoveal avascular zoneFluorescein angiographyOptical coherence tomography angiographyThree-dimensionalOPTICAL COHERENCE TOMOGRAPHYFOVEAL AVASCULAR ZONERETINAL VASCULAR LAYERSFLUORESCEIN ANGIOGRAPHYFLOW SPEEDSRETINOPATHYQUANTIFICATIONABNORMALITIESMICROCIRCULATIONNONPERFUSION