USC Roski Eye Institute 1 article published in JoVE Neuroscience Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography Sam Kushner-Lenhoff1, Bright S. Ashimatey1, Amir H. Kashani1,2 1Department of Ophthalmology, USC Roski Eye Institute, 2USC Ginsberg Institute for Biomedical Therapeutics, Keck School of Medicine of the University of Southern California This article describes a method for measuring retinal vasculature reactivity in vivo with human subjects using a gas breathing provocation technique to deliver vasoactive stimuli while acquiring retinal images.