When most people are asked to identify colors, the answers given are generally similar. However, some people have a color vision deficiency that causes them to see colors differently. In some cases, these deficiencies are extreme, a situation more commonly known as color blindness. Color blindness is most often found to be genetically inherited due to abnormal photopigments. These photopigment defects create three types of color blindness. Most commonly found is a red-green color blindness, with blue-yellow color blindness being a close second. Not being able to see any color, or total color blindness, is very rare. Occasionally, someone can become color-blind from physical or chemical damage, and age can sometimes impact the way people see colors.