Definition

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

Causes

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

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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

Symptoms

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

Diagnosis

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.

Treatment

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

Prevention

There are no known steps to prevent color blindness.