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. The resin can be classified into two types: natural resin and synthetic resin. 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. Resin lenses are chemically processed and polished with resin as the raw material.