Seeing Color
Written by: CJ Kazilek and Kim Cooper
Illustrated by: Dr. Biology

show/hide words to know

Ishihara test: named after its inventor, this test is used to tell if you can see colors... more

Photon: the smallest bit of light.

Photoreceptor: the special type of cell in your eye that picks up photons and then signals the brain. They are located in the retina (a layer at the back of the eye). There are two types, rods and cones.

Prism: a crystal object, such as cut glass, with at least three similar sides... more

Retina: getting its name from the Latin meaning "net", the retina is located at the back of the eye and is where light is detected... more

Trillion: 1,000,000,000,000.

Wavelength: a property of photons that determines their energy (how \"strong\" they are).We see photons of different wavelengths as different colors.

How We See Color

You look out at a field of wildflowers showing off their bright reds, brilliant blues, and accents of yellow and white centers. These are just a few of the rainbow of colors you will see today, but have you ever wondered how we see these colors? What about other animals, do they see the same colors as you? Do animals see color at all?

Field of wildflowers.

Field of colorful wildflowers displaying their bright red and blue colors. Image by Dellex via Wikimedia Commons.

You might not know it, but it is the light bouncing off objects like our field of flowers that gives us the ability to see. When the light enters our eyes, special cells tell our brains about the light. These cells are called photoreceptors. Light is made of little bits called photons. When the sun shines, trillions and trillions of these little bits of light fall on the earth. The photons bounce off of almost everything and some of them enter our eyes. Those bits that enter our eyes allow us to see. So, where does the color come from?


How are rainbows are made? Click the rainbow to find out how they work.

Starting in the 1600s with Sir Isaac Newton, scientists have believed that there are different kinds of photons. Different types give rise to our sense of colors. The different photons are said to have different wavelengths. Sunlight contains all the different wavelengths of photons. The visible wavelength colors can be seen when you look at a rainbow. Raindrops acting as natural prisms produce the colors.

How Do Our Photoreceptors Work?

rods and cones

Click on these eyes to see photoreceptors

We have two main types of photoreceptors called rods and cones. They are called rods and cones because of their shapes. These cells are located in a layer at the back of the eye called the retina. Rods are used to see in very dim light and only show the world to us in black and white.

This is why you see only black and white when you are outside in the evening or in a dimly lit room. The other type of photoreceptors, the cones, allow us to see colors. They are not as sensitive as the rods and they work best in bright light. There are three types of cones, one for each of the three main colors we see, red, green and blue. (click on the eyes above to learn more)

Some people have a genetic defect that makes one or more of the cones fail. This condition is known as color deficiency. You may have heard it called color blindness. Color blindness is fairly common, affecting about nine percent of all humans. It is much more common in men than in women. To test for color blindness a special picture called an Ishihara test is used. If you jump to our color test page you will be able to test yourself and also experience another interesting phenomenon of our color vision.

What about other animals? What kind of colors do they see? Most animals see fewer colors than we do, but some see more! We know this by looking at how many kinds of cone photoreceptors they have. Another good indication of what an animal can see is by looking at their own colors. The colors of their prey are also an indication of an animal's ability to see color. We have made a table of some common animals and what colors they see.

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Bibliographic details:

  • Article: Seeing Color
  • Author(s): CJ Kazilek, Kim Cooper
  • Publisher: Arizona State University School of Life Sciences Ask A Biologist
  • Site name: ASU - Ask A Biologist
  • Date published: September 27, 2009
  • Date accessed: June 12, 2024
  • Link:

APA Style

CJ Kazilek, Kim Cooper. (2009, September 27). Seeing Color. ASU - Ask A Biologist. Retrieved June 12, 2024 from

American Psychological Association. For more info, see

Chicago Manual of Style

CJ Kazilek, Kim Cooper. "Seeing Color". ASU - Ask A Biologist. 27 September, 2009.

MLA 2017 Style

CJ Kazilek, Kim Cooper. "Seeing Color". ASU - Ask A Biologist. 27 Sep 2009. ASU - Ask A Biologist, Web. 12 Jun 2024.

Modern Language Association, 7th Ed. For more info, see
CD color spectrum

Color spectrum on the surface of a music CD.

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