Sight scopes are mainly divided into the following three categories: Telescope sight, Collimating optical sight, and Reflex sight. Among them, telescopic sight and reflective sight are the most popular. The above two types of sights are mainly used during the day, so they are collectively referred to as white scope/sight. In addition, there is a night scope/sight for night vision, which adds night vision devices to the above two types of sights. According to the types of night vision devices, they can be divided into low light sights and infrared sights (which can be further divided into active infrared and thermal imaging).