Macular Degeneration: Causes, Risk Factors, and Treatment
What Is Age-Related Macular Degeneration?
AMD is a disease that damages the macula, the small central part of the retina responsible for sharp, detailed vision. It affects your ability to read, drive, and recognize faces, while typically leaving side vision intact.
The retina is the light-sensitive tissue lining the back of your eye. The macula sits at its center and handles all fine detail work. When the macula is healthy, central vision is sharp and clear. As AMD develops, the macula breaks down and central vision becomes blurry, dark, or distorted.
Dry AMD is the most common form of the disease, affecting roughly 85 percent of people with AMD. It develops when the macula gradually thins with age and tiny yellowish deposits called drusen (made up of proteins and fats) build up beneath the retina. Larger drusen are a key warning sign that AMD may be progressing.
In its most advanced stage, dry AMD can progress to geographic atrophy, a condition where patches of retinal cells in the macula die off completely and central vision is more significantly affected.
Wet AMD, also called neovascular AMD, affects about 15 percent of people with the disease. It occurs when abnormal, fragile blood vessels grow beneath the macula and leak blood and fluid into the retina. This leaking can cause rapid and severe damage to central vision.
A protein called vascular endothelial growth factor (VEGF) drives the growth of these abnormal vessels. Although wet AMD is less common, it is responsible for a large share of serious vision loss associated with the disease.
AMD often begins in one eye and may eventually affect both. In early stages, changes in the retina and choroid (the layer of blood vessels beneath the retina) are subtle and may not cause noticeable symptoms. Without regular monitoring, significant vision loss can occur before a person realizes something is wrong.
Who Is at Risk for AMD?
Several factors increase a person's likelihood of developing AMD. Some of these, like age and genetics, cannot be changed. Others, like smoking and cardiovascular health, can be addressed with lifestyle changes and medical care.
AMD is rare before age 50 and becomes significantly more common with each decade of life. As the eye ages, its ability to clear waste products and maintain healthy blood flow to the macula naturally declines. This cumulative wear on retinal cells is what sets the stage for AMD.
Smoking is the most consistently identified modifiable risk factor for AMD. Current smokers face two to three times the risk of developing AMD compared to nonsmokers. Smoking damages blood vessels, reduces oxygen delivery to the retina, and increases oxidative stress on delicate retinal tissue. Quitting smoking is the single most impactful lifestyle step a person can take to reduce their AMD risk.
People with a parent or sibling who has AMD face a meaningfully higher risk of developing the disease themselves. Researchers have identified genes related to the complement system, a part of the body's immune response, that influence how the eye manages inflammation and waste removal. Having a family history of AMD is an important reason to begin regular retinal screenings earlier.
AMD is more common among people of Caucasian and European descent than among other racial groups. Women are also at somewhat higher risk, in part because they tend to live longer. That said, AMD can develop in anyone, regardless of race or sex.
Conditions that affect the heart and blood vessels also raise the likelihood of developing AMD. The connection makes sense because the macula depends on a steady supply of healthy blood flow.
- High blood pressure can damage the small vessels that nourish the retina
- High cholesterol may contribute to drusen formation beneath the macula
- Heart disease is associated with reduced blood flow to the eye
- Obesity increases inflammation throughout the body, including in the eye
Managing these conditions through lifestyle changes and medical treatment may help lower AMD risk or slow its progression.
Recognizing the Signs of AMD
AMD can be silent in its early stages, making routine eye exams essential. As the disease progresses, certain symptoms become noticeable and should prompt a prompt evaluation by a retina specialist.
In the early stages, vision may appear completely normal even as drusen are forming and tissue changes are occurring in the macula. This is one of the most important reasons to have regular comprehensive eye exams after age 50. A retina specialist can detect early AMD before any vision loss occurs.
As AMD advances, specific changes in vision often appear. Noticing these early and acting quickly can help protect your sight.
- Distortion or waviness of straight lines, such as doorframes or text on a page
- A blurry or dark spot in the center of your vision
- Difficulty reading, even with corrective glasses
- Faded or less vivid colors
- Trouble recognizing faces
- Gradual or sudden loss of central vision in one or both eyes
An Amsler grid is a simple checkerboard-style tool with a dot in the center. You look at it one eye at a time to check for any wavy, blurry, or missing areas. These changes can be an early sign of problems in the macula. Retina specialists often recommend using an Amsler grid regularly at home, especially if you have been diagnosed with early or intermediate AMD. Any new distortion should be reported to your retina specialist promptly.
Diagnosing AMD
Our retina specialists use a combination of clinical examination and advanced imaging to accurately diagnose AMD and determine its stage. Knowing the type and severity of AMD is essential to forming the right treatment plan.
A dilated eye exam is the most reliable way to detect AMD. Drops are used to widen the pupils, giving the specialist a clear view of the macula and retina. The exam can reveal drusen, pigment changes, fluid, bleeding, or areas of thinning, often before symptoms appear.
OCT is a painless imaging test that creates detailed cross-section images of the retina's individual layers. It allows a retina specialist to detect fluid buildup, swelling, drusen, and geographic atrophy with great precision. OCT takes only a few minutes and is used for both initial diagnosis and ongoing monitoring.
Fluorescein angiography is used to detect wet AMD. A special dye is injected into a vein in the arm, and a camera photographs the dye as it travels through the retinal blood vessels. Leaking or abnormal vessels beneath the macula appear clearly on these images. This test helps the retina specialist confirm whether wet AMD is present and plan treatment accordingly.
Treatment Options for AMD
Treatment depends on the type and stage of AMD. Our retina specialists, Dr. Gaurav Gupta and Dr. Pranjal Thakuria, tailor treatment plans to each patient's specific condition, working closely with them to preserve as much vision as possible.
Anti-VEGF injections are the standard treatment for wet AMD. These medications block the protein VEGF that drives abnormal blood vessel growth, stopping leaking and helping to stabilize or, in some cases, improve central vision. Several options are available, and your retina specialist will recommend the one best suited to your situation.
Medications include aflibercept (Eylea), ranibizumab (Lucentis), faricimab (Vabysmo), bevacizumab (Avastin, used off-label), and brolucizumab (Beovu). Each has a different dosing schedule and risk profile. Treatment typically begins with monthly injections before the interval is extended based on your response.
For advanced dry AMD, specifically geographic atrophy, two newer treatments are available. Pegcetacoplan (Syfovre), a complement C3 inhibitor given monthly or every other month, and avacincaptad pegol (Izervay), a complement C5 inhibitor given monthly, have both been shown to slow the growth of geographic atrophy in clinical trials. These treatments slow disease progression but do not restore vision that has already been lost.
For people with intermediate dry AMD, a specific combination of vitamins and minerals known as the AREDS2 formula may help slow progression to more advanced stages. The formula includes vitamin C, vitamin E, lutein, zeaxanthin, zinc, and copper, and is available over the counter. Your retina specialist can advise whether AREDS2 supplements are appropriate for your stage of AMD.
These supplements are not a treatment for wet AMD and do not reverse existing vision loss. They are intended as a preventive measure for those at risk of progression.
AMD is a chronic condition that requires long-term care. People with dry AMD need periodic monitoring so their specialist can catch any progression early. Those receiving injections need regular visits to assess their response and adjust the treatment schedule as needed. Consistent follow-up is one of the most important parts of preserving vision over time.
Living Well with AMD
An AMD diagnosis affects not just vision but daily life and emotional well-being. There are practical steps and resources that can help people with AMD stay active, independent, and informed.
Beyond stopping smoking, several lifestyle habits may support eye health and help reduce the risk of AMD progression.
- Eat a diet rich in leafy greens, colorful fruits, and fish
- Maintain a healthy weight and exercise regularly
- Keep blood pressure and cholesterol well controlled
- Wear sunglasses that block ultraviolet light when outdoors
If AMD has caused significant central vision loss, low vision rehabilitation can help you make the most of your remaining sight. Low vision specialists can recommend magnifying devices, specialized lighting, large-print materials, and electronic aids. Many people with AMD continue to live independently and enjoy daily activities with the right tools and support.
Feelings of worry, frustration, or sadness after an AMD diagnosis are completely understandable. Staying connected with family, joining a support group, or speaking with a counselor can be genuinely helpful. Being actively involved in your own care and staying informed about your condition can also bring a sense of control and confidence.
When to See a Retina Specialist
Knowing when to schedule a routine screening and when to seek care urgently can make a real difference in protecting your vision. AMD can progress quickly, especially when it converts from dry to wet form.
Because early AMD often causes no symptoms, comprehensive eye exams become especially important after age 50. If you have risk factors such as a family history of AMD, a history of smoking, or cardiovascular disease, more frequent screenings may be recommended. Early detection gives you the best possible chance of preserving your vision.
Some vision changes can signal a sudden worsening of AMD or another serious retinal condition. Do not wait for a scheduled appointment if you experience any of the following.
- A sudden increase in floaters (spots or strands drifting across your vision)
- Flashes of light in one or both eyes
- A curtain or shadow spreading across your field of vision
- Sudden loss of central vision in one eye
These symptoms may indicate that dry AMD has converted to wet AMD or that another urgent retinal problem is developing. Prompt evaluation and treatment can significantly affect outcomes.
Frequently Asked Questions
These answers are meant to help you apply what you have read to your own situation and make more confident decisions about your eye care.
There is no guaranteed way to prevent AMD from developing, particularly given the strong role of age and genetics. However, focusing on what you can control matters. Quitting smoking, eating well, staying active, and managing blood pressure and cholesterol all meaningfully reduce your risk. For those already diagnosed with intermediate dry AMD, AREDS2 supplements may reduce the chance of progression. Starting regular exams after age 50 is the best way to catch AMD before it affects your vision.
AMD affects central vision only, not peripheral (side) vision, so complete blindness from AMD alone is uncommon. Most people retain enough side vision for basic mobility and orientation. With early detection and consistent treatment, particularly anti-VEGF injections for wet AMD, many patients maintain functional central vision for daily activities such as reading and watching television. The goal of treatment is to preserve as much vision as possible for as long as possible.
Drusen are the small yellowish deposits that form beneath the retina in early and intermediate AMD. Having small drusen alone does not necessarily mean you will develop significant vision loss, but larger or more numerous drusen signal a higher risk of progression. Geographic atrophy is the advanced stage of dry AMD, where the retinal cells in the macula have died and cannot regenerate. Geographic atrophy produces more lasting central vision loss than drusen alone and is now the target of the newer complement inhibitor treatments.
Injection frequency is not fixed and typically changes over the course of treatment. For wet AMD, most people begin with monthly injections for a few months, and then the interval is extended based on how the eye responds. Some medications allow for intervals of up to 16 weeks. For geographic atrophy, complement inhibitors are given monthly or every other month. Your retina specialist will continually reassess your response at each visit and adjust the schedule accordingly. Some patients need fewer injections over time, while others require ongoing regular treatment.
Research into AMD is very active. Scientists are exploring gene therapy approaches, longer-acting anti-VEGF formulations that could reduce injection frequency, and implantable devices designed to deliver medication over extended periods. Additional targets in the complement pathway are also being investigated for geographic atrophy. While no current treatment reverses AMD damage, the pace of development has meaningfully improved the outlook for people living with this condition, and new options continue to emerge.
A family history of AMD is a significant risk factor, and earlier screening is a smart step. In general, having a parent or sibling with AMD means you should discuss a screening schedule with a retina specialist before age 50, rather than waiting. Your specialist will assess your individual risk factors and recommend how often to be seen. Finding AMD in its earliest stages gives you the most options and the best chance of protecting your vision long-term.
Schedule Your Retinal Evaluation at Rhode Island Eye Institute
If you are concerned about macular degeneration or have not had a comprehensive eye exam recently, our team is here to help. At Rhode Island Eye Institute, our fellowship-trained retina specialists provide advanced diagnostic and treatment services using the latest technology available. We are proud to care for patients across our multiple locations and are committed to helping you protect your vision at every stage of life.