Tinted car windows provide privacy for those inside. Still, being able to recognise someone in the dark can help save lives.
Infrared technology plays its part here. Light particles meet semi-conductors and are converted into electrons with the help of which images are created.
Current night-vision devices are bulky since they contain various bits of technology, and need cryogenic freezing to work.
An international team headed by a female Australian researcher has achieved a breakthrough with its prototype.
Using nanometre-sized crystals they have developed a film that can be easily applied to glasses and generates images at room temperature.
The development should benefit not only security teams but those whose vision is affected by darkness.
A ray of light.