In recent years the nosology (= classification of diseases) of Dry Eye has greatly changed. Moving beyond the simple name of Dry Eye syndrome, we now consider the condition to be Dry Eye disease, insisting on the lack of tears, the lacrimal inflammation and hyperevaporation leading to self-sustaining loops of neurogenic and palpebral inflammations.

Professor Baudouin MD, PhD, from the National Ophthalmology Hospital XV-XX, Vision Institute of Paris, explains through this didactic video the complexity of the Dry Eye disease: