Molecular formula :
nature : commonly known as contact lenses. A directly attached to the lens surface of the cornea, the majority from artificial polymer materials, divided into rigid, semi-rigid and soft three, rigid contact lens is not the type of oxygen and polymethyl methacrylate microscope and the oxygen-siloxane - acrylate copolymer mirror, and are less comfortable; semi-rigid gas permeable lens can be from the hydrophobic made of silicone rubber, the most common soft lens from PMMA hydroxyethyl methacrylate (HEMA), or a modified material. The mesh crosslinked PMMA HEMA has good absorbent, can form Hydrosol can best meet the physical needs and comfort requirements. In HEMA introduced N-vinyl pyrrolidone can increase its water content, the introduction of methyl methacrylate can increase its mechanical strength. Polymer contact lens vision correction can also be used for eye treatment, administration purposes.
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