Because the light spot (light emission) entering the eye in the red dot sight is always balanced with the red dot sight, even if the eye is not on the central axis of the red dot sight, it can accurately aim through the red dot, which can improve the shooting accuracy when moving at high speed or shaking the body. Therefore, it is widely used in military firearms and even HUD (head up display) of fighter planes in various countries. In addition, in addition to being generated by LED lamps, special light can also be provided by natural light or very low-level radioactive substances (semi permanent and effective).
