OCT angiography in detecting preclinical diabetic retinopathy

The invention of OCT angiography (OCTA) was a milestone in studying the early stages diabetic retinopathy (DR). latest findings show significant changes foveal avascular zone (FAZ) parameters (FAZ area, FAZ perimeter, acirculatory index, axis ratio, angle) diabetes mellitus patients with no ophthalmoscopic signs DR. Many studies evaluate vessel density superficial and deep plexuses these using different methods image processing qualitative quantitative parameters. Nonperfusion areas (NA) are very important at preclinical stage DR, which can be detected layers. With OCT-A it is possible not only to reveal them but also calculate their area. Vascular tortuosity (VT) described earlier fundus photography. Nowadays VT assessed microcirculation level scans. Microaneurysms earliest clinical sign They missed photos, easily OCT-A. aim current review analyze DR discuss future diagnostic value