Racial and Ethnic Differences in Macular Degeneration: African Americans
Macular degeneration does not affect all groups of people at the same rate. It affects Caucasians more than African-Americans or people of Hispanic/Latino background. There may also be genetic differences that underpin the disease for people with different ethnic origins.1
This article covers general information about macular degeneration as well as what we know about this disease among African-Americans.
How does macular degeneration develop?
The retina is a thin layer of light-sensitive cells at the back of the eye. It is responsible for receiving light energy through the pupil and transforming that energy into signals that go to the brain. This is the basic process that enables us to see.
Macular degeneration happens when the central part of your retina, called the macula, is damaged. This leads to impaired vision, particularly in the center of your eye. This is the area responsible for your ability to read, drive, recognize faces, and see fine detail.1
About 80 percent of people with macular degeneration have what’s known as dry AMD. In dry AMD, you develop small clumps of fatty, yellow-looking cells in the back of the eye. These clumps are called drusen.2 Over time, drusen can grow and cause more damage to your vision.
What is age-related macular degeneration?
Although macular degeneration can develop in children and teens, by far the most cases of the disease occur in people over 50. That’s why the condition is frequently known as age-related macular degeneration, or AMD.3
Different numbers among ethnic groups
In the United States, white Americans had the highest chance of developing AMD. As of 2010, 2.5 percent of white adults over 50 had AMD.
The numbers are lower for people with different ethnic backgrounds:4
- Caucasians: 2.5 percent
- African-Americans: 0.9 percent
- Latino/Hispanic: 0.9 percent
- Other: 0.9 percent
The difference is even greater when you look at AMD by age 80:4
- Caucasians: 14 percent
- African-Americans: 2 percent
- Latino/Hispanic: 2 percent
- Other: 2 percent
Macular degeneration in African-Americans
Most studies have looked at European Caucasians to understand AMD – how often it develops, how it looks when it worsens, and common genetic risk factors.
More recent research is starting to look at the disease in African-Americans specifically.
Key differences include:5
- AMD is less common among older African-Americans than Caucasians.
- African-Americans are less likely to develop larger drusen.
- Fewer large drusen appear in the central part of the eye for African-Americans.
- Only 36 percent of drusen appear in the central part of the eye for African-Americans, compared to 61 percent for Caucasians.
- African-Americans are less likely than Caucasians to have their drusen grow from medium to large, a measure of the disease progressing, or getting worse.6
Because of these differences, researchers wonder if African-Americans may have protection against vision loss and AMD.
African-American genetics and AMD
Researchers at Vanderbilt University are currently attempting to conduct genetic studies on older African-Americans with AMD to see if they have the same or different genetic risk factors as Caucasians. If different genes are at play, researchers may learn important clues about preventing or treating the disease.7
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