The term color vision deficiency (CVD) is a more accurate term for people with problems seeing colors. True color blindness is extremely rare!
CVD, however, is not uncommon especially in males. One in 12 males suffer from some form of CVD but only 1 in 200 females are color vision deficient.
There are several variations of CVD:
• Deuteranomalia – simply makes colors look a little faded
• Protanopia – makes everything seem a little green (red-green deficient)
• Tritanopia – makes everything appear in greenish-pink tones (blue-yellow deficient)
• Monochromacy – total color blindness; only about 0.00003% of the world’s population suffer from monochromacy
In his years of practice, Dr. Tabak has never seen a case of total color blindness but sees forms of CVD on nearly a weekly basis.
A red-green deficiency is the most common. This does not mean that people with a red-green deficiency cannot see these colors; they simply have a harder time differentiating between them.
CVD is usually an inherited condition caused by a common X-linked recessive gene passed from a mother to her son. When children have an eye exam, they should always be assessed for CVD; it can typically be detected at an early age.