What happens in age-related macular degeneration

Age-related macular degeneration (AMD) is a condition where the macula—the part of your retina responsible for sharp central vision—gradually breaks down. The damage usually starts after age 50 and progresses slowly, though the speed varies widely. You may notice blurred or distorted words when reading, or a dark spot appearing in the center of your vision. Peripheral vision (what you see to the sides) typically stays intact, which is why AMD rarely causes complete blindness.

The macula contains millions of light-sensitive cells that send signals to the brain. As these cells deteriorate, the brain receives less information about what you're looking at directly ahead. Early on, you might not notice anything. By the time symptoms appear, some cell damage has already occurred. The condition exists in two main forms—dry and wet—and they progress differently.

Key Takeaways

  • AMD damages the macula, the part of your retina that handles sharp central vision, usually starting after age 50.
  • Dry AMD, the more common form, develops slowly as the macula thins; wet AMD is rarer but progresses faster because abnormal blood vessels leak fluid.
  • Risk factors include age, family history, smoking, high blood pressure, and certain genetic variations.
  • Early detection through regular eye exams can slow progression, and treatments exist for wet AMD but not yet for dry AMD.

Dry AMD: The slower, more common form

Dry AMD accounts for roughly 80 to 90 percent of all AMD cases. In this form, the cells of the macula gradually thin and break down on their own. The retina accumulates deposits called drusen—small yellowish spots made of protein and fat that build up under the macula. These deposits are visible during an eye exam and are often the first sign that AMD is developing.

Dry AMD progresses in stages. Early dry AMD may have no symptoms at all; you might only learn you have it during a routine eye exam. Intermediate dry AMD causes some vision loss, though many people still read and drive. Late dry AMD, also called geographic atrophy, involves larger areas of cell death and causes noticeable vision loss in the center of your visual field. The progression from early to late can take years or decades, or it can happen more quickly—there is no way to predict which path any individual will take.

Currently, no treatment stops or reverses dry AMD, though research into new approaches continues. A combination of vitamins and minerals called the AREDS2 formula (containing lutein, zeaxanthin, zinc, and vitamins C and E) has been shown to slow progression in people with intermediate or late dry AMD. Your eye doctor can discuss whether this supplement makes sense for your situation.

Wet AMD: Rarer but faster-progressing

Wet AMD occurs when abnormal blood vessels grow beneath the macula and leak fluid or blood. This happens in about 10 to 20 percent of AMD cases, but it accounts for most cases of severe vision loss. The leaking fluid damages the macula more rapidly than dry AMD does, sometimes causing noticeable vision loss within weeks or months.

Wet AMD often develops from dry AMD—a person with dry AMD can develop the wet form later—though not everyone with dry AMD will progress to wet. The first sign is often a sudden change: straight lines may appear wavy, or a dark spot may expand quickly. These symptoms warrant an urgent eye exam because early treatment can preserve more vision than waiting.

Several treatments can slow or stop the leaking in wet AMD. Anti-VEGF injections (drugs like bevacizumab, ranibizumab, and aflibercept) are injected directly into the eye to block the growth signals that abnormal blood vessels respond to. Photodynamic therapy uses a light-activated drug to destroy leaking vessels. Laser treatment can sometimes seal leaking vessels, though it is less commonly used now. These treatments work best when started early, which is why prompt evaluation of sudden vision changes matters.

Risk factors and who develops AMD

Age is the strongest risk factor—AMD is rare before 50 and becomes more common with each decade after that. Family history matters significantly; if a parent or sibling has AMD, your risk is higher. Smoking roughly doubles the risk of developing AMD and is one of the few risk factors you can directly control.

High blood pressure, high cholesterol, and obesity increase risk. Certain genetic variations, particularly in genes related to immune function and inflammation, make some people more susceptible. Race and ethnicity play a role too; AMD is more common in people of European descent than in other populations, though the reasons are not fully understood.

Having one or more risk factors does not mean you will develop AMD. Many people with multiple risk factors never do, while some with few risk factors do. This unpredictability is why regular eye exams become important as you age, especially if you have a family history.

How AMD is detected and monitored

AMD is usually found during a dilated eye exam, where your eye doctor uses drops to widen your pupils and examine the retina directly. They look for drusen, areas of thinning, or signs of abnormal blood vessels. If they suspect AMD, they may order additional imaging—optical coherence tomography (OCT) creates detailed cross-section images of the retina, and fluorescein angiography uses dye and photography to show blood vessel leakage.

If you have been diagnosed with AMD, your eye doctor will recommend how often to return for follow-up exams. People with intermediate or late dry AMD typically return every few months to a year. Those with wet AMD may be seen more frequently, especially after starting treatment. Between visits, you can monitor your own vision using an Amsler grid—a simple checklist pattern that helps you spot sudden changes in your central vision.

Living with AMD and preserving remaining vision

AMD does not cause pain, and it does not lead to complete blindness because peripheral vision remains. Many people with AMD continue reading, driving, and working, especially in the early and intermediate stages. As vision loss progresses, adaptations help: larger print, brighter lighting, magnifying glasses, and screen-reading software for computers.

Low-vision specialists can assess your remaining vision and recommend devices and techniques tailored to your needs. Organizations like the American Foundation for the Blind and the Macular Degeneration Association offer resources, support groups, and training in adaptive strategies. Some states offer rehabilitation services for people with vision loss.

Controlling other health conditions matters too. Managing blood pressure and cholesterol, quitting smoking if applicable, and maintaining a healthy weight may slow AMD progression. A diet rich in leafy greens, fish, and nuts—foods high in lutein, omega-3 fatty acids, and antioxidants—is associated with better outcomes, though diet alone cannot stop the disease.

Research and emerging treatments

Dry AMD remains an active area of research because current treatments are limited. Scientists are investigating drugs that target inflammation, slow cell death, or regenerate damaged cells. Gene therapy approaches are in early testing. Some of these treatments may become available within the next several years, though it is too early to know which will prove effective.

For wet AMD, newer anti-VEGF drugs are being developed with longer-lasting effects, potentially reducing the frequency of injections. Combination therapies that target multiple pathways are also under study. Clinical trials are ongoing at academic medical centers and specialized eye clinics; your eye doctor can discuss whether you might be a candidate for a trial.

Frequently Asked Questions

Can AMD run in families?

Yes. If a parent or sibling has AMD, your risk is higher than average. However, having a family history does not mean you will definitely develop it. Regular eye exams become more important if AMD runs in your family, especially after age 50.

Will I go blind from AMD?

AMD rarely causes complete blindness because it affects only the central macula, not the peripheral retina. Most people retain enough side vision to move around safely. Vision loss is usually gradual, giving you time to adapt and seek support services.

What is the difference between dry and wet AMD?

Dry AMD develops as the macula thins naturally over time and is slower-progressing. Wet AMD involves abnormal blood vessels that leak fluid, causing faster vision loss. Wet AMD is less common but more likely to cause significant vision loss if untreated. Treatments exist for wet AMD but not yet for dry AMD.

How often should I have my eyes checked if I have AMD?

This depends on the stage and type of AMD. Early dry AMD may warrant annual exams, while intermediate or late AMD typically requires visits every few months to a year. Wet AMD usually requires more frequent monitoring, especially after treatment begins. Your eye doctor will recommend a schedule based on your specific situation.

Can vitamins prevent or treat AMD?

The AREDS2 formula has been shown to slow progression in people with intermediate or late dry AMD, but it does not prevent AMD or treat wet AMD. It is not a substitute for medical care. Talk with your eye doctor about whether this supplement is appropriate for you.