Why do cats eyes glow in the dark?
There is a simple explanation for that characteristic green or gold shine. A membrane, called tapetum lucidum, coats the eye and reflects light. When a cat is in the dark, his pupils open wide and light is reflected off them, but they aren’t actually glowing. This ability, along with their extraordinary sensitivity to ultraviolet rays, enables them to see very well in the dark. Can cats really see in the dark? They can’t see in total darkness and their daytime vision is only fair, but they can see far better than humans in semi-darkness. They can also distinguish brightness 7 times better than we do. As nocturnal hunters, their eyes are able to scoop up even the smallest scrap of available light. Their vision generally is blurred at the edges and they see best at 6 – 20 feet. When it comes to movement, though, the cat doesn’t miss a twitch. An aside: a cat’s diet without taurine, a substance crucial for his eyesight, will make the cat go blind. Dog food lacks taurine, so never feed it
