Macular degeneration is one of the leading causes of vision loss in people over 50, yet a lot of people only hear the term after a diagnosis. That’s unfortunate, because several of the biggest risk factors are things you can actually influence. Understanding what causes it, and what’s within your control, is the best defense you have.
What is macular degeneration?
Macular degeneration, more formally age-related macular degeneration (AMD), affects the macula, the small central part of the retina responsible for sharp, detailed vision. It’s what lets you read, recognize faces, and see fine details straight ahead. Peripheral vision usually stays intact, so AMD rarely causes total blindness, but it can make everyday tasks like reading, driving, or recognizing someone across a room genuinely difficult.
There are two main types:
- Dry AMD is the more common form, making up around 80 to 90 percent of cases. It develops as the macula thins and small protein deposits called drusen build up under the retina. Vision loss is typically gradual.
- Wet AMD is less common but more aggressive. Abnormal blood vessels grow underneath the retina and leak fluid or blood, causing faster and often more severe vision loss. Dry AMD can progress into wet AMD, which is one reason regular monitoring matters.
What causes macular degeneration?
There’s no single cause. AMD develops from a mix of factors, some you can control and some you can’t.
Age
Age is the single biggest risk factor, and it’s built into the name. Risk rises noticeably after 50 and continues climbing with each decade. This part isn’t preventable, but it’s worth knowing your risk increases over time so you can adjust how often you get screened.
Genetics
If a parent or sibling has AMD, your own risk is significantly higher. Researchers have identified several genes linked to the condition, though having those genes doesn’t guarantee you’ll develop it. Family history is simply a signal to pay closer attention.
Smoking
Smoking roughly doubles the risk of developing AMD, making it one of the most significant preventable risk factors identified. It restricts blood flow to the retina and increases oxidative stress in eye tissue. Quitting lowers your risk over time, even if you’ve smoked for years.
Race and ethnicity
AMD is more common in white populations than in Black, Hispanic, or Asian populations, though the reasons for this difference aren’t fully understood.
Diet and weight
Diets high in saturated fat and low in leafy greens and fish have been linked to higher AMD risk. Obesity is also associated with faster disease progression in people who already have early signs of AMD.
Cardiovascular health
High blood pressure, high cholesterol, and cardiovascular disease are all connected to a higher risk of AMD, likely because they affect blood flow to the retina, similar to how they affect blood flow elsewhere in the body.
Sun exposure
Some research suggests that long-term exposure to UV light may contribute to AMD risk, though the evidence here is less conclusive than it is for smoking or diet. Wearing sunglasses with UV protection is a low-effort habit that can’t hurt.
Can macular degeneration be prevented?
You can’t eliminate your risk entirely, especially if age or genetics are working against you. But several habits have real, evidence-backed effects on lowering your risk or slowing progression if you already have early AMD.
Don’t smoke: This is the single most impactful change available. If you currently smoke, quitting is the best thing you can do for your eyes and for the rest of your health too.
Eat for your eyes: Diets rich in leafy greens, fish, nuts, and colorful fruits and vegetables are associated with lower AMD risk. Nutrients like lutein, zeaxanthin, and omega-3 fatty acids show up consistently in eye health research.
Manage your blood pressure and cholesterol: Since cardiovascular health and eye health are linked, keeping your numbers in a healthy range benefits both.
Maintain a healthy weight: Weight management, particularly for people with early AMD, has been shown to slow disease progression in some studies.
Wear sunglasses: UV protection is cheap insurance against a risk factor that’s still being studied but easy to guard against.
Get regular eye exams: This one matters most for people with a family history of AMD. Early detection means your doctor can monitor changes, recommend supplements if appropriate, and catch a shift from dry to wet AMD before it causes major damage.
Consider AREDS2 supplements if advised: For people with intermediate AMD, a specific combination of vitamins and minerals, studied in the Age-Related Eye Disease Study, has been shown to slow progression in some cases. This isn’t something to start on your own. Talk to your eye doctor first, since these supplements aren’t right for everyone.
When to see a doctor
Macular degeneration doesn’t usually cause pain, which is part of why it can go unnoticed. Watch for early signs like straight lines appearing wavy or bent, blurry spots in your central vision, or difficulty adjusting to low light. If you notice any of these, especially a sudden change, see an eye doctor promptly. Wet AMD in particular can progress quickly, and early treatment makes a real difference in preserving vision.
Macular degeneration isn’t fully preventable, but it also isn’t something you’re powerless against. Quitting smoking, eating well, managing cardiovascular health, and keeping up with regular eye exams can meaningfully lower your risk or slow the disease if it’s already begun. The earlier it’s caught, the more options you have.
Frequently asked questions
What is the main cause of macular degeneration?
There isn’t one single cause. Age is the biggest risk factor, followed by genetics, smoking, and cardiovascular health. Most cases result from a combination of these factors rather than any one alone.
Can macular degeneration be reversed?
Not currently. Existing vision loss from AMD generally can’t be reversed, but treatment and lifestyle changes can slow further progression, especially if caught early. This is why regular eye exams matter, particularly after age 50.
Does diet actually make a difference for macular degeneration?
Yes. Diets high in leafy greens, fish, and colorful produce are linked to lower AMD risk, largely due to nutrients like lutein, zeaxanthin, and omega-3 fatty acids. Diet alone won’t eliminate risk, but it’s one of the more controllable factors available.
Is macular degeneration hereditary?
It can be. Having a parent or sibling with AMD raises your own risk, and researchers have identified several genes associated with the condition. A family history is a good reason to start regular eye exams earlier rather than waiting.
What’s the difference between dry and wet macular degeneration?
Dry AMD is more common and progresses gradually as the macula thins and deposits build up underneath the retina. Wet AMD is less common but more aggressive, caused by abnormal blood vessels leaking fluid under the retina, and it can cause faster vision loss if not treated promptly.
Medically Reviewed by Dr Terence Tan