article_snippet: The human eye can see more that we thought, researchers said in December.
article_snippet: The human eye had previously been believed The human eye cannot see infrared light, in the same way we can't see X-Rays and radio waves.
article_snippet: However, researchers have revealed that under certain conditions, the retina can sense infrared light after all.
article_snippet: By firing powerful lasers that emit pulses of infrared light, An international team of researchers co-led by scientists at Washington University School of Medicine in St. Louis found that when laser light pulses rapidly, light-sensing cells in the retina sometimes get a double hit of infrared energy.
article_snippet: When that happens, The human eye is able to detect light that falls outside the visible spectrum.
article_snippet: This us did for 27 colours in the visible spectrum.