Cats can distinguish some other colors, but these colors are also quite pale and not as realistic as how humans see colors. When cats look at something colorful, their eyes can pick up on colors they see that we might not. For example, what we see as purple, cats will see as blue. To understand this, think about how purple is created. Purple is created by mixing red and blue in equal proportions. Since cats can't see red, their eyes will adjust to the blue part. When a cat sees yellow Cat You Call It Nagging I Call It Listen To What I Freaking Said The First Time Shirt, this yellow will appear slightly blue to them. Red, on the other hand, doesn't contain blue or green, so cats will see gray. In general, the colors that cats see are less vibrant than humans. As far as what colors cats see, cats are primarily red-green colorblind. This phenomenon is known as deuteranomaly or protanomaly. With this type of color blindness, your cat will have trouble distinguishing between red, brown, orange, and purple colors. Cats' photoreceptors are most sensitive to wavelengths between the blue-violet and green-yellow bands.