The recent introduction of optical coherence tomography (OCT) angiography has sparked interest in evaluating vascular alterations in the retina and optic nerve head for diagnosis, staging, and monitoring in glaucoma. In 2014, Jia and colleagues provided the first account of vascular abnormalities at the optic nerve head measured by a swept-source OCT in glaucoma (see {1}). In this study, the same group evaluated the peripapillary flow index and the peripapillary vessel density for discrimination between glaucomatous and healthy eyes by using a spectral-domain OCT and reported the area under the receiver operating characteristic curve to be 0.892 and 0.938, respectively. This Recommendation is of an article referenced in an F1000 Faculty Review also written by Kelvin H. Wan and Christopher K.S. Leung.