Color blindness, or color vision deficiency, causes a person to see colors differently from most other people. There are several types of color blindness. Color vision deficiency or loss has multiple ...

Generally, people identify one million colors, but it is thought that there are people in the world who have 'four-color type color vision ' that identifies 100 million colors, which is 100 times that ...

While people and other vertebrates are color blind in dim light, some deep-sea fish may possess keen color vision to thrive in the near total darkness of their extreme environment thanks to a unique ...