<P> Night vision is the ability to see in low light conditions . Whether by biological or technological means, night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range . Humans have poor night vision compared to many animals, in part because the human eye lacks a tapetum lucidum . </P> <P> Night - useful spectral range techniques can sense radiation that is invisible to a human observer . Human vision is confined to a small portion of the electromagnetic spectrum called visible light . Enhanced spectral range allows the viewer to take advantage of non-visible sources of electromagnetic radiation (such as near - infrared or ultraviolet radiation). Some animals such as the mantis shrimp can see using much more of the infrared and / or ultraviolet spectrum than humans . </P> <P> Sufficient intensity range is simply the ability to see with very small quantities of light . </P>

Night vision devices use which type of waves
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