Dogs’ eyes have many adaptations to make them able to see quite well in the dark. For example, dogs have larger pupils, which allow more light to pass through the eyes.
And while dogs may have fewer cones in their eyes than humans, they have more light-sensitive cells, called rods. The rods in dogs’ eyes work better in dimmer light than the cones that detect color.
The lens of dogs’ eyes is also closer to the retina than ours, which makes the image on the retina brighter, even in dimmer situations.
Dogs have an advantage to seeing in the dark because of a part of the eye called the tapetum. This part of the eye is like a mirror in the back of the eye that reflects light, giving the retina another chance to register the light — and therefore the image — that has entered the eye.
It is the tapetum that gives dogs’ and cats’ eyes that eerie “glowing” look in the night; it’s literally reflecting the light from the dog’s surroundings.
It’s estimated that dogs can see five times better in the dark than us humans.
Credit : DogTime
Picture Credit : Google
