On low light or even completely dark nights, the human eye's ability to perceive the environment will sharply decrease. Scientific research has shown that when the illuminance is below 0.1 lux (equivalent to the light intensity of a moonless night), the human eye can hardly distinguish details. This is precisely the scenario where night vision devices come into play.

There are two main working principles of night vision devices. One is optical amplification imaging, which converts weak photons into electrons through a photocathode, amplifies the electronic signal thousands of times through a microchannel plate, and finally restores it to a visible image on a fluorescent screen.

Due to the sensitivity of the human eye to green light, over 90% of night vision devices use green display to reduce visual fatigue.

Another type is thermal imaging, which captures the mid to far infrared radiation released by objects and converts it into temperature distribution images. It can recognize targets even in zero visible light environments, and this technology is commonly used in military and police reconnaissance and rescue missions.

Data shows that modern third-generation night vision devices can amplify 0.003 lux of light to a brightness that can be clearly recognized by the human eye; High performance thermal imaging equipment can detect subtle changes with a temperature difference of only 0.05 ℃.

This means that whether in moonless forests or in smoke and mist, users can steadily lock onto their targets.

With technological advancements, night vision devices have been widely used for wildlife observation, security patrols, and emergency rescue. Compared to the traditional human eye's nighttime recognition rate (about 10%), night vision devices can increase the recognition rate to over 80%, which not only significantly improves work efficiency but also greatly increases the safety of nighttime activities.