Since then , the technology has evolved from bulky devices that amplify light about 1 , 000 times to compact equipment that can amplify any light source including faint starlight up to 50 , 000 times , and eyewear that allows soldiers to see in complete darkness such as in caves by detecting heat differences 这项技术发展至今,已经由当初仅可以将光源增强1000倍的大型仪器改进成为现在可将任何光源包括微弱的星光增强5万倍的小巧的精密仪器了。戴上可以感应热量的夜视目镜,士兵们即使在完全黑暗的环境里例如山洞里也可以将周围的物体看得清清楚楚。