Hylo ® EvoTears ® eye drops are a sterile medical device designed to hydrate dry, irritated eyes and relieve dry eye symptoms. EvoTears are anhydrous drops, produced without the addition of preservatives and phosphates. They contain only perfluorohexyl octane ( F6H8® ). EvoTears ® moisturizing eye drops without preservatives - properties Hylo ® EvoTears eye drops create a stable lipid layer that remains on the tear film for a long time. In this way, they alleviate persistent or severe symptoms and protect the eye against irritation. Because EvoTears eye drops do not contain preservatives, they are generally well tolerated. In addition, the lack of phosphates in the composition helps to avoid complications that can be caused by the accumulation of insoluble precipitate in the corneal layer.