article_snippet: However, researchers have revealed that under certain conditions, the retina can sense infrared light after all.
article_snippet: An international team of researchers used cells from the retinas of mice and people.
article_snippet: By firing powerful lasers that emit pulses of infrared light, An international team of researchers found that  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. '