colour blindness
Dichromatic vision is colorblindness. Normal color vision is known as trichomacy, which means that the eye uses all three types of light cones normally. Dichromatic vision means that people can only use two types of cones. There are different types, depending on which cone does not work.
Dichromatic vision is the ability for an animal to distinguish colors in dim light. It is the evolution of the basal mode of vision in animals.
Horses have a limited colour range in vision. They have dichromatic vision, meaning they see the world in many shades of greys, browns, and yellows.
red and green
Dogs have binocular vision over about 80 degrees of their visual field, which is enough for good quality binocular vision. This does vary some by breed, with collies probably having a smaller area of binocular vision than a golden retriever due to the placement of the eyes and length of the nose. Dogs have dichromatic vision, meaning they see in only two colors. Read more: Vision - How dogs see
Colorful, multihued, dichromatic (weak)
It's hard to say. Cows have dichromatic vision (can only see in blues and yellows), but do not have binocular vision like predators such as humans and lions do, and cannot really judge distance as well. They can, however, see almost behind their heads because their eyes are on the side of their head (like all prey animals).
Cats have vision identical to a red-green colorblind human, they have no red cones meaning the colors red, yellow, and green are indistinguishable. They only have blue cones and green cones and thus can only see colors that can be distinguished via them. All mammals except primates (humans are primates) have this same limited dichromatic vision.
Guinea pigs are known to have dichromatic color vision. This means that guinea pigs can see every color, but red.
It's used in the base-10 number system.
Low vision "eye doctors" are also referred to as low vision specialists and low vision optometrists. They are optometrists who specialize in working with those who suffer from low vision, especially macular degeneration Most of their works centers around finding magnification solutions to help those with the disease. Solutions can include specialized lenses, off the shelf magnifiers and CCTVs.
Cows are not colour blind. They are dichromatic, in other words they can only see in yellows and blues.