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Global Dry Eye Syndrome Treatment Market: Overview Dry eye syndrome (DES) is also known as keratisis sicca and kerato-conjunctivitis sicca. People suffering from DES show damage to the ocular surface, instability in the tear film, and visual disturbance. Tear film covers the ocular surface, which is made up of three intertwined layers, a superficial lipid layer, produced by meibomian glands assist in reducing tear evaporation and uniform tear spreading, middle thick aqueous layer produced from lacrimal glands, and the innermost hydrophilic mucin layer produced from goblet cells of conjunctiva and epithelium of ocular surface. The two most common types of DES are DES associated with Sjogren syndrome (SS) and DES unassociated with SS. DES can also be classified as aqueous deficiency dry eye and evaporative dry eye disorder. According to TearScience Inc., in 2012, around 86% of the patients in Europe and the U.S. were suffering from DES showed symptoms of Meibomian Gland Dysfunction (MG...