Some of these cells are called cones. Even though many people think that being color-blind means a person can't see any color, this isn't true. Instead, most people who are color-blind just have a hard time telling the difference between certain colors. If you don't have the correct chemicals in the cones, they may not let you see the right number of main colors. Most people who are color-blind aren't able to see red or green.
Color blindness is much more common in boys than in girls.
If a person can't see the picture or number within the dots, he may be color-blind. Color blindness isn't dangerous or a big deal. Kids who are color-blind may need a little extra help when matching clothes. For specific medical advice, diagnoses, and treatment, consult your doctor.