PVA hydrogel has the characteristics of water content, elastic modulus, low friction coefficient, high mechanical strength, rich pore leakage network structure, and good biocompatibility similar to the natural tissues of the human body. Wide range of applications. It can be used to manufacture artificial cartilage, artificial cornea, artificial vitreous, etc. Polyvinyl ferment hydrogel is widely used in ophthalmology and can be used to make soft contact glasses. Because of its water solubility, it can be made into sustained-release drug capsules.