title: Conceptual advantages of using pupil to limbus ratio over absolute pupil diameter.
authors.affiliation: Department of Ophthalmology, University Hospital of Henares, Madrid, Spain; Department of Medicine, Francisco de Vitoria University, Madrid, Spain.
authors.forename: Julio González
authors.initials: JG
authors.lastname: Martín-Moro
authors.affiliation: Department of Neurology, University Hospital of Getafe, Madrid, Spain.
authors.forename: Belén Pilo
authors.initials: BP
authors.lastname: de la Fuente
authors.affiliation: Department of Ophthalmology, University Hospital of Henares, Madrid, Spain; Department of Optics II, Complutense School of Optometry, Madrid, Spain.
authors.forename: Fernando Gomez
authors.initials: FG
authors.lastname: Sanz