What can fogging of NVG lenses indicate?

Fogging of NVG lenses primarily indicates that temperature changes are affecting performance. When the conditions around the lenses cause moisture to condense on the surface, it can significantly impair visibility. This typically happens when the NVGs are exposed to contrasting temperatures, such as moving from a cold environment to a warmer, more humid one.

Fogging is a physical interaction between temperature and humidity that alters how light passes through the lenses. Understanding this phenomenon is critical for users, as fogged lenses can impact situational awareness and overall operational effectiveness. Users must be aware of environmental conditions that can contribute to fogging, allowing them to take appropriate actions to mitigate the issue, such as using anti-fog treatments or storing the goggles properly when not in use.