Dry eye is a very common and multifactorial disease of the tears and the ocular surface that results in symptoms of discomfort, visual disturbances, and tear film instability with potential damage of the ocular surface. Chronic dry eye can be accompanied by inflammation of the ocular surface.
Dry eye disease (DED) is one of the most frequent ocular morbidities and affects a significant percentage of the population, especially those over 40 years of age.
DED is more common in women than in men and can affect any ethnicity. The estimated number of people affected ranges from 25-30 million in the United States alone. Worldwide, the incidence rate closely parallels that of the United States, resulting in more than 300 million patients affected.