The term color vision deficiency (CVD) is a more accurate term for people with problems seeing colors. True color blindness is extremely rare.
A red-green color deficiency is the most common form. CVD is an inherited condition caused by a common X-linked recessive gene passed from a mother to her son
So, moms, be aware. If CVD is present in your family, you should know your son or daughter may have inherited the condition. (CVD is much rarer in girls.) When children have an eye exam, they should always be assessed for CVD; it can typically be detected at an early age.