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Health Information Center

Color Blindness

  • Cynthia M. Johnson, MA
Publication Type:


Color Blindness

(Color Vision Problem; Color Vision Deficiency)


Color blindness is a problem seeing colors the same way as most people.


The most common cause of color blindness is a faulty gene that is passed from mother to son. Other causes are:

  • Eye diseases, such as glaucoma or macular degeneration
  • Brain and nervous system problems, such as Alzheimer disease or multiple sclerosis
  • Some medicines, such as hydroxychloroquine
  • Eye or brain injuries
  • The normal aging process
Anatomy of the Eye.

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Risk Factors

Color blindness is more common in men and people who are White. The risk is also higher in people who have any of the health problems that cause color blindness. Other things that raise the risk are:

  • A family history of color blindness
  • Taking medicine that can harm the eye, such as hydroxychloroquine


Some people do not know they are color blind. Symptoms may be problems seeing:

  • The difference between some colors
  • The brightness of some colors
  • Different shades of colors


You will be asked about your symptoms and health history. An eye exam and vision test will be done. You may need to see a doctor to confirm the diagnosis.


There is no cure for people who are color blind due to their family history. Most people learn ways to tell the difference between colors.

Some people may be able to get back their color vision when their medical problem is treated or their medicine is changed.

Some tools that may help people with everyday tasks are:

  • Color-corrective glasses or contact lenses
  • Mobile device apps that can show differences between colors and some shades of color


There are no known steps to prevent color blindness.





  • Color blindness. National Eye Institute website. Available at: https://nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness.
  • Colour blindness. Colour Blind Awareness website. Available at: http://www.colourblindawareness.org/colour-blindness.
  • Hydroxychloroquine. EBSCO DynaMed website. Available at: https://www.dynamed.com/drug-monograph/hydroxychloroquine .
  • What is color blindness? American Academy of Ophthalmology website. Available at: http://www.aao.org/eye-health/diseases/what-is-color-blindness.


  • Daniel A. Ostrovsky, MD
Last Updated:

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.