What is color deficiency?

Color deficiency occurs when your ability to distinguish certain colors and shades is less than normal. The term "color blind" is often used, but usually incorrectly. Only a very small number of people are completely unable to identify any colors. There are two major types. Red-green deficiency is by far the most common and results in the inability to distinguish certain shades of red and green. Blue-yellow deficiency is less common and affects the perception of blue and yellow colors. In very rare cases, color deficiency exists to an extent that no colors can be detected. This person sees all things in shades of black, white and gray.  more

Color vision deficiency means that your ability to distinguish some colors and shades is less than normal. It occurs when the color-sensitive cone cells in your eyes do not properly pick up or send the proper color signals to your brain. About eight percent of men and one percent of women are color deficient.  more

Color deficiency occurs when the ability to distinguish certain colors and shades is less than normal. The term "color blind" is often used, but usually incorrectly. Only a very small number of people are completely unable to identify any colors. What causes color deficiency? Color Deficiency is usually inherited, but can also result from certain diseases, trauma or as a side effect of certain medications. It happens when the color-sensitive cone cells in the retina of the eyes do not properly pick up or send correct color signals to the brain. What types of color deficiency exist? In lay terms, there are two major types. Red-green deficiency is by far the most common and results in the inability to distinguish certain shades of red and green. Blue-yellow deficiency is less common and affects the perception of blue and yellow colors. In very rare cases, color deficiency exists to an extent that no colors can be detected. This person sees all things in shades of black, white and gray. ...  more

Color deficiency occurs when your ability to distinguish colors and shades is less than normal. The term "color blind" is often used, but usually incorrectly. Only a very small number of people are completely unable to identify any colors.  more