Application of lubricants structure on ophthalmic lens

In this paper, novel approaches to the study of the relationship between the chemical structures and the wear properties of lubricants on an ophthalmic lens by various analytical methods are described. The X-ray damage of lubricants by X-ray photoelectron spectroscopy (XPS) depends upon the lubricant structure. Further, the lubricant structure influences the wear properties. In particular, the experimentally observed X-ray damage and wear properties indicate that the straight linear chain structure with no side chain structure ((-CF2-CF2-O-)m-(CF2-O-)n) is stronger than that with the side chain structure ((-CF (CF3)-CF2-O-)m). This result suggests that the investigation of X-ray damage by XPS is equivalent to an examination of the strength of the wear characteristic. The abovementioned methods are suitable for studying the durability of lubricants on ophthalmic lenses.