Optical coherence tomography angiography (OCTA) is a non-invasive angiography type without a contrast agent, which provides a detailed assessment of the retinal and choroidal vasculature and visualization of blood flow by detecting motions of erythrocytes, using serial optical coherence tomography B-scans. As compared to gold standard techniques such as fluorescein and indocyanin-green angiography, OCTA offers two major advantages: no dye is required and depth resolution is required is provided. As such OCTA has the potential to improve our abilities to diagnose and monitor ocular vascular diseases.