Abstract

People's lives depend to a large extent on biological barriers that line, e.g., the surfaces of our lungs and eyes. These barriers regulate molecular transfer and protect the body from external threats. In this work, we discuss how biological barriers function on the surfaces of the eye and the lungs. Regarding eye function, the dry eye syndrome affects about one-third of the world's population. It is typically caused by excessive evaporation of aqueous tear fluid from the ocular surface, and the key reason for excessive evaporation is impaired function of the tear film lipid layer (TFLL), whose function is to cover the aqueous tear film and resist evaporation.

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