Tapetum n. : An area in the pigmented layer of the choroid coat of the eye in many animals, which has an iridescent or metallic luster and helps to make the eye visible in the dark. Sometimes applied to the whole layer of pigmented epithelium of the choroid.

Example:
Rhodopsin has the same effect as Tapetum lucium in your night vision?

Taxonomy
tapetum lucidum, eyeshine, animals, retina, humans, blue eye, red-eye effect, tapeta, lucida, primates, cats and dogs, eye, the eye, pupils, retroreflectors, free encyclopedia, species, Choroidal.

Defination from the web:
tapetum lucidum, so their pupils may display eyeshine. ... when the individual is not looking into the camera, because the tapetum lucidum is far less extensive than the retina. ... Retinal tapetum, as seen in teleosts, crocodiles, marsupials and fruit bats. ...