3 Interesting Facts About Dogs Eyes.

• Dogs have 3 eye lids! Upper, lower, and the third one protects the eye by keeping it moist.
• Dogs can see in the dark because of a special membrane called tapetum lucidum. It is a reflective layer behind the retina, that enhances their vision in low light conditions. It acts like a mirror reflecting light back through the retina. Dogs, cats, horses, cattle, deer, and some fish have this membrane,
• Dogs can see black and white. They can also see blue, yellow and grey. They only have 2 types of colour receptors in their eyes. Humans have 3 colour receptors, which enable us to see the full colour spectrum.