Susan P Mollan1, Michael A Burdon2, Alex J Sinclair3. 1. Neurotrauma and Neurodegeneration, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, The Medical School, University of Birmingham, Birmingham, England2Birmingham Neuro-Ophthalmology Unit, Ophthalmology Department, Unive. 2. Birmingham Neuro-Ophthalmology Unit, Ophthalmology Department, University Hospitals Birmingham NHS Trust, Queen Elizabeth Hospital Birmingham, Birmingham, England. 3. Neurotrauma and Neurodegeneration, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, The Medical School, University of Birmingham, Birmingham, England3Neurology Department, University Hospitals Birmingham NHS Trust, Que.