By injecting nanoparticles into the eyes of , scientists gave them the ability to see near- light—a wavelength not normally visible to rodents (or people).

from https://gizmodo.com/incredible-experiment-gives-infrared-vision-to-mice-and-1832940986
https://i.kinja-img.com/gawker-media/image/upload/s–8VVhJOkG–/c_scale,f_auto,fl_progressive,q_80,w_800/dtu0iclof3eqdgsshemh.jpg