Human Eye can See 'Invisible' Infrared Light

Any science textbook will tell you we can't see infrared light. Like X-rays and radio waves, infrared light waves are outside the visual spectrum. But an international team of researchers co-led by scientists at Washington University School of Medicine in St. Louis has found that under certain conditions, the retina can sense infrared light after all. Using cells from the retinas of mice and people, and powerful lasers that emit pulses of infrared light, ...