1 Department of Ophthalmology, Hospital Universitario del Henares, Coslada, Madrid, Spain; Grado de Medicina, Universidad Francisco de Vitoria, Madrid, Spain. Electronic address: juliogmm@yahoo.es.
2 Department of Ophthalmology, Hospital Universitario del Henares, Coslada, Madrid, Spain.
3 Department of Neurology, Hospital Universitario de Getafe, Getafe, Madrid, Spain.
4 Department of Ophthalmology, Hospital Universitario Príncipe de Asturias, Alcalá de Henares, Madrid, Spain.