Night vision

From Wiki 24

Night vision usually refers to the ability to see clearly in a dark environment. It happens naturally in some species, but in the case of humans, it is acheived by a variety of sources, the most popular being Night-vision glasses or goggles. It can also be obtained by use of thermal detecting technology.

In the "24" world, Night vision technology, including goggles and thermal detectors, are used by CTU agents to seek out individuals wanted by the organization. They are mainly used for stealth purposes, so that the agents are not detected by those who are being watched.