Colour Deficiency
Colour deficiency occurs when your ability to distinguish colours and shades is less than normal. Only a very small number of people are completely unable to identify any colours (colour blind). Colour deficiency is more common in males than females.
Colour deficiency is usually inherited, but can also result from certain diseases, trauma, or as a side effect of certain medications.
People who are colour deficient are generally unaware of their condition. They assume that everyone sees things the way they do. Every child should be checked for colour deficiency by at least age five. It is important to detect colour deficiency early because colour coded learning materials are used extensively in the primary grades. In addition, colour deficiency may affect the career path of an individual, since the ability to distinguish colours is an important aspect of some jobs. Unfortunately a cure for colour deficiency has not yet been discovered. However, a person with colour deficiency can be taught to adapt to the inability to distinguish colours.