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Dry eye affects millions of people around the world, causing a number of medical, social and economic consequences. Its prevalence varies between 14 and 33%, a number that increases considerably with age and is much more frequent in women. Studies show that dry eye is a multifactorial eye disease, characterized by the loss of homeostasis in the tear film, causing instability, inflammation and even severe damage. In this presentation, we will detail the new concepts, delve into the most common causes, in their training, diagnosis and treatment cycles.