Dry eye disease (DED), also known as dry eye syndrome (DES), keratoconjunctivitis sicca (KCS), and keratitis sicca, is a multifactorial disease of the tears and the ocular surface that results in discomfort, visual disturbance, and tear film instability with potential damage to the ocular surface. Dry eye disease is a common form of ocular surface disease (OSD) and may overlap with other causes of OSD, such as ocular allergy and meibomian gland dysfunction (MGD).
Depending on the severity of dry eye disease , the following are the most common patient complaints: