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Visual Perception

Could You Be Colorblind?

Some people know they're colorblind -- they can't tell the difference between red and green, or blue and yellow, or perhaps they can't see color at all. But people with more minor cases of colorblindness might not even know it. In these cases, they perceive colors differently than most people, but the condition is only picked up after tests in a clinic or lab.

The Science of Color Blindness

Here's what's going on in the eyes of the color blind.

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Key Facts In This Video

  1. The cones in the retina contain three types of photopigments that are sensitive to different wavelengths of visible light. 00:16

  2. The genes for red and green photopigments are located on the X chromosome, which is why more males are colorblind than females. 01:23

  3. Colorblindness doesn't mean that you see the world in shades of gray. 01:48

Could There Be a Cure For Colorblindness?

Two scientists developed a gene therapy to treat colorblindness in a monkey.

Are You Colorblind? Take the Test.

Perhaps you are and don't even know it.

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Key Facts In This Video

  1. In your eyes, rods perceive light and cones perceive color. 01:36

  2. About 8% of men in the world have some degree of colorblindness, but only 0.5% of women have colorblindness. 03:40

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