This Clinical OCT Angiography Atlas shows the state-of-the-art principles of clinical OCTA imaging. The key word is ""clinical"", helping users to interpret OCTA images and guiding clinicians to understand the features of angiographic images. The first edition was a great success and is now sold out. Worldwide enthusiasm will still increase for OCT angiographic imaging, and we anticipate a progressive development of its clinical applications. This second edition Atlas has been deeply transformed and developed. All chapters have been completely rewritten; some are entirely new and ground-breaking. We report the great advances OCT Angiography has obtained in the clinical field since the first edition in 2015. OCTA allowed us to identify new pathologies, recognize new syndromes, and organize disorders in new classifications. Known diseases are now better understood and new diseases are described.