The resin is a hydrocarbon (hydrocarbon)-like secretion from a variety of plants, particularly conifers. It is valued for its special chemical structure and its use as a latex paint and glue. It is a mixture of various polymer compounds and therefore has different melting points. Resins can be classified into natural resins and synthetic resins. There are many kinds of resins, which are widely used in people's light industry and heavy industry. They are also often seen in daily life, such as plastics, resin glasses, paints, etc. The resin lens is a chemically processed synthetic polished lens using a resin as a raw material.