Tarig Abkur1, Kayal Vijayakumar2, Amanda J Churchill2, James Stevens2. 1. From the Department of Neurology (T.A., J.S.), Southmead Hospital; Department of Paediatric Neurology (K.V.), University Hospital Bristol NHS Foundation Trust; School of Medicine (K.V., A.J.C., J.S.), University of Bristol; and Department of Ophthalmology (A.J.C.), Bristol Eye Hospital, UK. tarig.abkur@nbt.nhs.uk. 2. From the Department of Neurology (T.A., J.S.), Southmead Hospital; Department of Paediatric Neurology (K.V.), University Hospital Bristol NHS Foundation Trust; School of Medicine (K.V., A.J.C., J.S.), University of Bristol; and Department of Ophthalmology (A.J.C.), Bristol Eye Hospital, UK.