How dogs see the world?
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Dogs have a visual field of about 240 degrees compared to our 180-degree field. Their peripheral vision is much better than ours, but they don’t see colours as vividly as we do. Dogs can see in the dark thanks to a special membrane called the tapetum lucidum, which reflects light back into the eye, allowing them to see better at night.
Dogs also have a third eyelid, called the nictitating membrane, which protects their eyes from debris and helps keep them lubricated. This membrane is more noticeable in dogs with blue or light-coloured eyes.
While dogs don’t see colours as vividly as we do, they can see a wider range of colours than we can. This is because their retinas have more rods than ours. Rods are sensitive to light and movement, but not colour. Cones, on the other hand, are responsible for colour vision. Humans have three types of cones, which allow us to see red, green, and blue. Dogs have two types of cones, which allow them to see blue and yellow.
So, while dogs don’t see the world in as many colours as we do, they do see a wider range of colours than we can. And their peripheral vision is much better than ours!