The tapetum lucidum is a layer of tissue in the eye of many vertebrates and some other animals. Lying immediately behind the retina, it is a retroreflector. It reflects visible light back through the retina, increasing the light available to the photoreceptors. The tapetum lucidum contributes to the superior night vision of some animals. Many of these animals are nocturnal, especially carnivores, while others are deep sea animals.
The dark blue, teal, and gold tapetum lucidum from the eye of a cow
Choroid dissected from a calf's eye, tapetum lucidum appearing iridescent blue
Reflection of camera flash from the tapetum lucidum
A three-month-old black Labrador puppy with apparent eyeshine
An eye is a sensory organ that allows an organism to perceive visual information. It detects light and converts it into electro-chemical impulses in neurons (neurones). It is part of an organism's visual system.
Compound eye of an Antarctic krill
Eye of a European bison
Human eye, a refractive cornea type eye.
The eyes of a mantis shrimp (here Odontodactylus scyllarus) are considered the most complex in the whole animal kingdom.