1. Clinical & Experimental Optometry Research Lab, Center of Physics (Optometry), School of Sciences, University of Minho, Gualtar, 4710-057 Braga, Portugal
2. Grupo de Investigación en Superficie Ocular y Lentes de Contacto, Departamento de Cirugía (Oftalmología), Universidad de Santiago de Compostela, 15782 A Coruña, Spain
3. Department of Ophthalmology, Centro Hospital de Entre Douro e Vouga, Santa Maria da Feira, Portugal
4. Department of Ophthalmology, Hospital Escola, Universidade Fernando Pessoa, Gondomar, Portugal