What is a color vision test? 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 tell you that you're color blind.

What is normal color perception?

Normal color vision is known as trichromacy–tri because it uses all three types of cones correctly allowing us to see so many brilliant colors. Take one cone away—go from being what scientists call a trichromat to a dichromat—and the number of possible combinations drops to 10,000.

What is the perception of color?

Color perception involves a processing stream that includes opsin-containing cones in the retina, color-opponent responses in the retinal ganglion cells, computations of color contrast in striate cortex, and a network of temporal areas that underlie the emergence of a stable color percept.