The material contains moisture, among which P-HEMA is the main material of soft contact lenses, which has the advantages of softness and comfort and is suitable for people with healthy eyes.
Among the soft contact lens materials, the most widely used polymer hydrogel is 2- hydroxyethyl methacrylate (HEMA) monomer.
Hema nonionic or silicone hydrogel cosmetic contact lenses, because there will be no cosmetic contact lenses, all nonionic or silicone hydrogels, because each material has the advantages of each material, so basically all nonionic/silicone hydrogels and ordinary materials should be matched in golden ratio to better highlight the value of silicone hydrogels.
Material application
2-hydroxyethyl methacrylate (HEMA) is a functional monomer synthesized by researchers from DuPont in 1936. As a traditional biological basic material, HEMA monomer and its polymer have good biocompatibility. It is widely used in tooth filling, drug slow release, burn coating, organ transplantation, contact lens manufacturing, cell culture and immobilization of biomolecules and enzymes.
1960, Czech scientist O.Wichterle and others synthesized polymethacrylate -2- hydroxyethyl hydrogel for the first time in the world through free radical polymerization, and successfully applied it to soft contact lenses. 1965, HEMA material invented by O.Wichterle was patented in the United States, and subsequently, Baush &; Lomb Company purchased the patent of Wichterle, and in 197 1 year, the world's first commercialized soft contact lens was introduced.