Founded in 1992, it is a comprehensive enterprise specializing in the research, development and production of plastic optical components

Xi'an Siduo Optoelectronic Instrument Co., Ltd., formerly known as Xi'an Star Optoelectronic Machinery Research Institute, was established in 1992 and is a private science and technology enterprise with high-tech personnel as the main body. It is mainly engaged in the research, development and production of plastic optical components.

Due to the development of business, the institute was restructured into a limited liability company in 2000, and its business expanded to the development and production of magnifying glasses, special microscopes, special telescopes, high-power LED lenses and lamp cups, camera lenses, viewfinders, aspherical lenses, PC spectacle lenses, glass reticles, ophthalmic correction sheets, and optical plastic molds in addition to R&D and production of resin optical optical components.

Stomax is a registered trademark of the company. The company has 14 patents. The factory built by the company is located in Hongqing Industrial Park, an ancient city in the eastern suburbs of Xi'an, China, with convenient transportation and elegant environment, welcoming customers from all over the world.