G Lamotte1, R Laballe2, B Dupuy3. 1. Department of Neurology, University Hospital of Caen Basse-Normandie, avenue Côte-de-Nacre, 14033 Caen, Basse-Normandie, France. Electronic address: guillaumelamotte14@gmail.com. 2. Department of Ophthalmology, Pasteur Hospital of Cherbourg, 46, rue du Val-de-Saire, 50100 Cherbourg-Octeville, France. 3. Department of Neurology, Pasteur Hospital of Cherbourg, 46, rue du Val-de-Saire, 50100 Cherbourg-Octeville, France.