Cats' eyes get their shine from a structure called the tapetum lucidum

Cats' eyes get their shine from a structure called the tapetum lucidum that sits behind the photoreceptors.This structure is made from layers
of mirror-like cells containing crystals that send incoming light bouncing back towards the photoreceptors and out of the eye.This results in an eerie glow,and it also gives the photoreceptors a second chance to detect photons.In fact, this system has inspired the artificial cats' eyes we use on our roads.Toads, on the other hand, have adapted to take it slow.