1. Department of Ophthalmology (Oftalmar), Medimar International Hospital, Alicante, Spain,
2. Fundación para la Calidad Visual, Alicante, Spain,
3. Department of Optics, Pharmacology and Anatomy, University of Alicante, Spain,
4. Department of Optics II (Optometry and Vision), Complutense University of Madrid, Spain,