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Contact lenses are becoming more and more popular. Today, a contact lens is a high-tech biocompatible device capable of retaining moisture and allowing oxygen to reach the cornea, thereby preventing complications. But contact lenses are a medical product and wearing them is associated with certain risks. The work reveals some mechanisms of the occurrence of contact lens-related complications, presents the classification of general and metabolic complications. Complications of the epithelial, stromal and endothelial layers of the cornea are described. Characteristics of infectious and allergic complications of the eye surface are presented. Variants of mechanical damage to the surface of the eye by contact lenses are described. Recommendations for the treatment and prevention of contact lens-related complications are provided. [ABSTRACT FROM AUTHOR]