Color Blind Test

Some people can’t tell the difference between colors; they are COLOR BLIND. Our eyes have special cells in them that help us see colors; these cells are called CONES. If some of our cones are damaged, it can be hard to tell the difference between red and green; if other cones are damaged, things that are blue and yellow might look gray.

If a color blind person saw a pile of green crayons with one red crayon on the top, they might think all the crayons were the same color. But if there was an orange crayon on top of the green crayons, a color blind person might be able to see it.

Q: Why would a color blind person be able to see an orange crayon but not a red crayon? What is the difference between red and orange?

A: Orange is made of both red & yellow; a color blind person could tell that crayon was different because they could see that it was partly yellow.

We’re going to take a test to make sure we can tell the difference between colors.* See if you can observe the numbers and shapes in each picture.

* Don’t be alarmed if this is somewhat difficult; it is normal for young children to experience blue/green confusion.

Materials

Color blindness tests

• (3) 4”x4” squares of cellophane per group: (1) red, (1) green, (1) blue

Procedure

  • Allow the children to examine the different color blind tests
  • Hold up each one, one at a time, and allow them to identify the symbol in each test
  • Distribute the 3 colors of cellophane to each group
  • Allow them to experiment with filtering different colors of light
  • Ask them about the differences they observe using the cellophane filters

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