Optical coherence tomography angiography (OCTA) is a new imaging technology that allows the non-invasive and rapid reconstruction of the three-dimensional structure of the retinal and choroidal vascularization.Importantly, blood flow signals within the vessels can be derived from consecutive scans of the selected areas.
OCTA can show vascular structure consistent with conventional angiography, although it cannot yet calculate the filling time and evaluate the function of the blood-retinal barrier. OCTA can reveal deep capillary networks better than ever and detect choroidal neovascularization much earlier, providing additional information of
the underlying pathology. Thus, it is now being widely used in diabetic retinopathy, macular telangiectasia,age-related macular degeneration, central serous chorioretinopathy, retinal vein occlusion, and other fundus vascular diseases. Currently, this new technology still has some limitations such as movement artifacts and projection of superficial retinal vessels at the level of the retinal pigment epithelium. However with upgrades in the equipment and software, the current techniques will be improved, providing images more clearly. As a result, we will develop a more thorough understanding of the diseases.