By Anthony Pane, Consultant Neuro-Ophthalmologist, Mater Hospital, Brisbane, Australia; Mike Burdon, Consultant Neuro-Ophthalmologist, University Hospital, Birmingham, UK; and Neil R. Miller, Professor of Ophthalmology, Neurology and Neurosurgery, Frank B Walsh Professor of Neuro-ophthalmology, Wilmer Eye Institute, Johns Hopkins Hospital, Baltimore, MD, USA |