The first part of the atlas studies the principles of OCT angiography, the anatomy of retina and choroid, and the characteristic findings of important ocular diseases from an angiographic perspective. In the second part, the authors provide a general update on the state of clinical OCT angiography research in a variety of retinal and choroid disorders. In the third part of the atlas, the authors present technological innovations underway in OCT angiography to understand their future clinical applications and implications. Recently, new technological developments have made OCT angiography imaging even faster and easier for the clinician and patient.