Color Blindness

(Color Vision Problem; Color Vision Deficiency)


Color blindness usually affects a person’s ability to tell the difference between shades of red and green or shades of blue and yellow. Complete color blindness, which is rare, causes a person to see most objects in shades of gray.Color blindness is when light-sensing receptors in the eye do not work properly.


Most color blindness is inherited. Less frequently, color blindness is caused by a disease that affects the optic nerve or retina. This is referred to as acquired color blindness.
Anatomy of the Eye
Normal Anatomy of the Eye
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Risk Factors

Heredity is the main risk factor for color blindness. If your mother, father, or grandparents were color blind, you may have the gene(s) that cause color blindness. The condition is also more common in men. The following risk factors increase your chance of developing acquired color blindness:
  • Having certain diseases, such as glaucoma and macular degeneration
  • Taking certain medications that can damage the retina and optic nerve, such as hydroxychloroquine


People with color blindness cannot distinguish between some colors, especially red and green or blue and yellow. Most people with inherited color blindness do not have symptoms. However, they may not see colors the same way as others without color blindness.


You will be asked about your symptoms and medical history. An eye exam and vision test will be done. Or, you will be referred to an ophthalmologist (eye specialist) for testing.You may want to consider going to an eye specialist first. The eye specialist may be better able to make a diagnosis.Your vision will be tested. This can be done with:
  • Ishihara plates test
  • An arrangement test

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