1 Louveau, A. et al. Structural and functional features of central nervous system lymphatic vessels. Nature 523, 337-341, doi:10.1038/nature14432 (2015).2 Aspelund, A. et al. A dural lymphatic vascular system that drains brain interstitial fluid and macromolecules.J Exp Med212, 991-999, doi:10.1084/jem.20142290 (2015).3 London, A., Benhar, I. & Schwartz, M. The retina as a window to the brain—from eye research to CNS disorders.Nature Reviews Neurology 9, 44-53, doi:10.1038/nrneurol.2012.227 (2013).4 Russell, S. et al. Efficacy and safety of voretigene neparvovec (AAV2-hRPE65v2) in patients with RPE65-mediated inherited retinal dystrophy: a randomised, controlled, open-label, phase 3 trial. The Lancet390, 849-860, doi:https://doi.org/10.1016/S0140-6736(17)31868-8 (2017).5 Colella, P., Ronzitti, G. & Mingozzi, F. Emerging Issues in AAV-Mediated In Vivo Gene Therapy. Mol Ther Methods Clin Dev 8, 87-104, doi:10.1016/j.omtm.2017.11.007 (2018).