Optical glass used in the manufacture of lenses, mirrors, mirrors, windows and other glass materials for optical instruments or mechanical systems. Including colorless optical glass (usually referred to as optical glass), colored optical glass, radiation resistant optical glass, radiation proof glass and optical quartz glass, etc.. Optical glass has a high degree of transparency, chemical and physical properties (structure and properties), with a high degree of uniformity, with a specific and accurate optical constants.

The difference between optical glass and other glass is that it is a part of the optical system and must satisfy the requirements of optical imaging. Therefore, the determination of the quality of optical glass also includes some special and more stringent indicators.