OVERVIEW: Night Vision Goggles (NVG) are wearable electro-optical devices that amplify ambient light to enable visibility in low-light or nighttime conditions, primarily for dismounted infantry, vehicle crews, and aviators.

DETAILS: NVGs use image intensifier tubes to collect and amplify minimal ambient light—such as moonlight or starlight—producing a visible monochrome (typically green) image. They are generally binocular or biocular, head- or helmet-mounted, and allow hands-free use. Most modern NVGs offer adjustable focus, infrared illuminators for total darkness, and are compatible with weapon sights and helmets. They significantly enhance tactical capability during night operations but are limited by range, resolution, and vulnerability to bright light sources.

ROLE SUMMARY:
Category: Electro-Optical Vision System
Primary Use: Nighttime situational awareness and navigation
Function: Passive image intensification of ambient light
Strong Against: Low-light environments, covert movement
Weak Against: Bright light exposure, fog, smoke, and camouflage
Platform: Dismounted personnel, vehicle crews, pilots
Integration: Compatible with helmets, headgear, and modular optical systems

SOURCE:
Janes Soldier Systems
https://en.wikipedia.org/wiki/Night_vision_device