Optical coherence tomography angiography (OCTA) is a brand new imaging tool developed and clinically introduced recently into the ophthalmological diagnostic tool armamentarium. OCTA enables a segmented and detailed examination of retinal vasculature and structure in a non-invasive fashion within a few seconds based on the present and widespread OCT technology. Retinal and glaucoma specialists can evaluate vascular circulation in every possible separate layer for the first time in ocular imagining history and acquire a new understanding in the pathological process of ophthalmological diseases using OCTA. The developing process of this innovative technology is still in progress by companies based on the clinical feedback of the leading clinicians, in software and hardware, overcoming the technical limitations of OCTA and leading to reevaluation of well-known diseases.