Are cats and dogs color vision deficient?
Yes, we can compare man’s best friends’ vision with the vision of human being suffering from red or green color vision defiency (protanope, deuteranope, see fig. below). Dogs do see in color, but have two-color, or dichromatic vision, that is, they cannot distinguish between red, orange, yellow or green. They can see various shades of blue and can differentiate between closely related shades of grey that are not distinguishable to people. Cats have the ability to distinguish between blues and greens, but lack the ability to pick out shades of red. However, cats and dogs are primed to see “motion”, rather than defining the world through sight alone. They use a blend of senses such as smell and hearing with their vision to do what we humans use our eyes alone to do. • Are goldfish color vision deficient? The common goldfish is not colorblind. It seems that it can see a very wide range of the spectrum both infra-red and ultra-violet and has the largest range so far discovered. In that sen
