Normal human colour vision depends on three types of cone photoreceptors (short-, medium- and long-wavelength sensitive — S, M and L) that have different but overlapping spectral sensitivities. Genes ...

A color vision test, also known as the Ishihara color test, measures your ability to tell the difference among colors. If you don’t pass this test, you may have poor color vision, or your doctor may ...

A new study from the University of Arizona reveals that color vision in animals evolved around 500 million years ago, much earlier than the appearance of colorful fruits and flowers. The research, ...