Dr. Guillen is Bachelor of Medicine, by the Autonomous University of Barcelona (UAB). She completed her specialty in Ophthalmology at the Hospital Germans Trias i Pujol (Barcelona), Hospital Clínic de Barcelona, Barraquer Institute and Hospital de la Esperanza, Barcelona. She obtained the Degree of Specialist in Ophthalmology in June 2002. She worked at the Internal Medicine Service of Hospital del Mar, and at the Ophthalmology Department of both Hospital del Mar and Hospital de la Esperanza, in Barcelona.
Currently, she develops her clinical work and research in Área Otalmológica Avanzada. Her area of interest is the anterior segment of the eye, alergo-immunological processes of cornea and conjunctiva, as well as infections and disorders of the eyelids.