• 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 occurs when light-sensing receptors in the eye do not work properly. In most people, color blindness is inherited. Acquired color blindness is caused by a disease that affects the retina or optic nerve. It can also be caused by certain medications.
    Anatomy of the Eye
    Normal Anatomy of the Eye
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    Risk Factors

    Genetics 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


    There is no cure for inherited color blindness. Most people with color blindness learn methods to tell the difference between colors.
    Talk with your doctor about coping skills. Depending on the level of color blindness, some doctors recommend using color-corrective glasses or contact lenses. Some mobile devices have apps that can help someone determine the differences between colors and some shades of color.
    In some cases of acquired color blindness or deficiency, treatment of the medical problem or changing medications may correct the color blindness.


    To help reduce your chances of getting acquired color blindness, discuss your use of prescribed medications with your doctor.


    American Academy of Ophthalmology http://www.aao.org

    Howard Hughes Medical Institute http://www.hhmi.org


    Canadian Association of Optometrists http://www.opto.ca

    Canadian Ophthalmological Society http://www.cos-sco.ca


    Colour blindness. Colour Blind Awareness website. Available at: http://www.colourblindawareness.org/colour-blindness. Accessed June 1, 2016.

    Facts about color blindness. National Eye Institute (NEI) website. Available at: https://nei.nih.gov/health/color%5Fblindness/facts%5Fabout. Updated February 2015. Accessed June 1, 2016.

    What is color blindness? American Academy of Ophthalmology website. Available at: http://www.aao.org/eye-health/diseases/what-is-color-blindness. Accessed June 1, 2016.

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