Age-related macular degeneration (AMD) is a chronic eye disease that affects more than 10 million Americans. It is the leading cause of vision loss in people over 60 in the United States, and the number of people with AMD rises as they get older.
Macular degeneration affects tissue in the part of your retina that is responsible for central vision, called the macula. It causes blurred vision or a blind spot in the center of your vision, and can interfere with reading, driving, or other daily activities. You may first notice symptoms when you need more light to see up close.
There are two forms of AMD. Dry AMD affects about 85% of those with the disease and causes gradual loss of central vision, sometimes starting in one eye. Wet AMD, which accounts for 90% of all severe vision loss from the disease, often involves a sudden loss of central vision. Most people with the wet form of AMD previously had the dry form.
Signs and Symptoms
- Needing more light when doing close-up work
- Blurring of print when trying to read
- Colors appear less bright
- Haziness of vision
- Blurred spot in the central field of vision, which may get larger and darker
- Straight lines that appear wavy
- Objects appearing further away or smaller than usual
- Loss of central vision
- Sudden blind spot
What Causes It?
The macula, a part of your eye’s retina, is made of cells called rods and cones that are sensitive to light and needed for central vision. Underneath the macula is a layer of blood vessels called the choroids, which provides blood to the macula. A layer of tissue on the retina called the retinal pigment epithelium (RPE) keeps the macula healthy by transporting nutrients from the blood vessels to the macula and moving waste products from the macula to the blood vessels.
As you get older, the RPE can thin and not move nutrients and waste back and forth as efficiently. Waste builds up in the macula, and cells in the macula become damaged from lack of blood, affecting your vision.
With dry AMD, RPE cells lose their color and don’t get rid of waste products from the rods and cones. As waste builds up, the rods and cones deteriorate.
With wet AMD, blood vessels grow underneath the macula and leak fluid or blood. Researchers don’t know exactly what causes the new blood vessels to grow, although they think that it may be the breakdown in waste removal. That could explain why people with the wet form almost always start out with the dry form. The new blood vessels interfere with getting nutrients to the macula, and the rods and cones start to break down.
Who's Most At Risk?
People with the following conditions or characteristics are at risk for developing AMD:
- Age -- Macular degeneration is the leading cause of severe vision loss in people over 60.
- Gender -- Women are more likely to develop it than men.
- Cigarette smoking
- Family history of macular degeneration
- Heart disease
- High cholesterol
- Light eye color
- Long-term exposure to sunlight
- Low levels of antioxidants in your blood
- Carrying weight around your waist (belly fat)
What to Expect at Your Provider's Office
Your eye doctor can screen you for AMD as you get older. However, if you have any changes in your central vision or in your ability to see colors, you should see your doctor right away. Your doctor may use several methods to test you for AMD:
- A vision field test.
- Testing with an Amsler grid, which involves covering one eye and staring at a black dot in the center of a checkerboard-like grid. If the straight lines in the pattern look wavy or some of the lines seem to be missing, these may be signs of macular degeneration.
- Fluorescein angiography, where a special dye is injected into a vein in your arm and pictures are taken as the dye passes through the blood vessels in the retina.
- Optical coherence tomography (OCT), an imaging test that can look for areas where the retina may be thin or where there may be fluid under the retina.
There is no known cure for AMD. However, there are procedures that can help slow vision loss. Certain procedures and medications may stop the wet form of the disease from getting worse. Adding antioxidants to your diet may help prevent the wet and dry forms of AMD and slow their progression.
The dry form of AMD can progress to the wet form. If you have dry AMD, you will test your eyes daily at home using an Amsler grid. Let your doctor know immediately if there is any change in your vision,.
For wet AMD, a type of medication called anti-vascular endothelial growth factor (anti-VEGF) can be injected into your eye to stop new blood vessels from growing. Two such drugs are approved to treat AMD:
- Pegaptanib (Macugen)
- Ranibizumab (Lucentis)
Surgical and Other Procedures
Surgical and other procedures may help some cases of wet macular degeneration.
Photocoagulation (laser surgery) -- In photocoagulation, doctors use a laser to seal off blood vessels that have grown under the macula. Whether this procedure is used depends on where the blood vessels are located, how much fluid or blood has leaked out, and how healthy the macula is.
Photodynamic therapy -- Often used to seal off blood vessels that are under the center of the macula. Using photocoagulation on that location would result in permanent central vision loss. With photodynamic therapy, the doctor gives you a drug that stays in the blood vessels under the macula. When a light is shined in your eye, the drug closes them off without damaging the rest of the macula. Photodynamic therapy slows vision loss but doesn’t stop it.
Complementary and Alternative Therapies
Supplements are a valuable treatment for dry AMD. They may also help prevent both wet and dry types. However, you should not try to self-treat vision problems. See your doctor first for a diagnosis and treatment plan.
To treat AMD
- AREDS formula (vitamin C, vitamin E, beta-carotene, and zinc, plus copper) -- The Age-Related Eye Disease Study (AREDS) found that a combination of antioxidant vitamins plus zinc helped slow the progression of intermediate macular degeneration to an advanced stage. Because the advanced stage is when most vision loss happens, the supplement can help stave off vision loss. The National Eye Institute recommends that people with intermediate AMD in one or both eyes or with advanced AMD (wet or dry) in one eye but not the other take this formulation each day. However, this combination of nutrients did not help prevent AMD nor did it slow progression of the disease in those with early AMD. The doses of nutrients are:
- Vitamin C (500 mg per day)
- Vitamin E (400 IU per day)
- Beta-carotene (15 mg per day, or 25,000 IU of vitamin A)
- Zinc (80 mg per day)
- Copper (2 mg per day, to prevent copper deficiency that can occur when taking extra zinc)
Ocuvite PreserVision is formulated to contain the proper amounts of these nutrients. People who already take a multivitamin should let their doctor know before taking this formulation. Zinc can be harmful at a dose of 80 mg, so be sure to take this combination only under your doctor’s supervision. Zinc can cause copper deficiency, so a small amount of copper is added to the nutrients.
In the study, 7.5% of people who took zinc had problems including urinary tract infections, enlarged prostate, and kidney stones, compared to 5% of the people in the study who did not receive zinc.
- Lutein and zeaxanthin -- High levels of these two antioxidants that give plants orange, red, or yellow color may help protect against AMD, either by acting as antioxidants or by protecting the macula from damage from light. One study found that people with AMD who took lutein alone or in combination with other antioxidants had less vision loss, while those who took placebo had no change. However, another study failed to find any benefit from lutein. Egg yolks, spinach and corn have high concentrations of lutein and zeaxanthin.
To prevent AMD
- Leafy greens -- People who eat dark, leafy greens such as spinach, kale, collard greens, and watercress tend to have a lower risk of AMD. One study found that taking vitamins B6, B12, and folic acid reduced the risk of AMD in women over 40 with a history of or risk factors for heart disease. The doses used were:
- Vitamin B6 (50 mg daily)
- Vitamin B12 (1000 mcg per day)
- Folic acid (2500 mcg per day)
Folic acid can mask a vitamin B12 deficiency. Talk to your doctor before taking these vitamins at these doses.
- Omega-3 fatty acids (fish oil) -- In a study of more than 3,000 people over the age of 49, those who ate more fish were less likely to have AMD than those who ate fewer fish. Other studies show that eating fatty fish at least once a week cuts the risk of AMD in half. Another larger study found that consuming docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), two types of omega-3 fatty acids found in fish, 4 or more times per week may reduce the risk of developing AMD. However, this same study suggests that alpha-linolenic acid (another type of omega-3 fatty acid) may actually increase the risk of AMD. It's safe to eat more fish, although you may want to eat fish with lower levels of mercury such as shrimp, canned light tuna, salmon, catfish, and pollock. Women who are pregnant or breastfeeding are advised to eat up to 12 ounces a week of a variety of fish and shellfish that are lower in mercury. Talk to your doctor before taking fish oil supplements if you are at risk for AMD. Fish oil may increase your risk of bleeding, especially if you already take blood-thinners such as warfarin (Coumadin) or aspirin
The use of herbs is a time-honored approach to strengthening the body and treating disease. Herbs, however, can trigger side effects and can interact with other herbs, supplements, or medications. For these reasons, you should take herbs with care, under the supervision of a health care practitioner.
- Ginkgo (Ginkgo biloba, 160 mg - 240 mg per day) -- Ginkgo contains flavonoids, which researchers think may also help AMD. Two studies showed that people with AMD who took ginkgo were able to slow their vision loss. Ginkgo can increase the risk of bleeding, so people who take blood-thinners such as warfarin (Coumadin), clopidogrel (Plavix), or aspirin should not take ginkgo without talking to their doctor.
- Bilberry (Vaccinium myrtillus, 120 - 240 mg 2 times per day) and grape seed (Vitis vinifera, 50 - 150 mg per day) are also high in flavonoids, so researchers think that they may help prevent and treat AMD. However, so far no studies have looked at using bilberry or grape seed to treat AMD. Bilberry and grape seed may increase the risk of bleeding, so people who take blood-thinners such as warfarin (Coumadin), clopidogrel (Plavix), or aspirin should not take either bilberry or grape seed without talking to their doctor. People with low blood pressure, heart disease, diabetes, or blood clots should not take bilberry without first talking to their doctor. Do not take bilberry if you are pregnant or breastfeeding.
Severe AMD can cause legal blindness. Low vision aids may help if you have partial blindness. Sometimes blood vessels build up underneath the retina, causing the retina to become detached or scarred. If this happens, the chances of preserving your central vision are poor. This condition, called subretinal neovascularization, happens in about 20% of cases of AMD. It often comes back even after laser treatment.
Your eye doctor will see you regularly to monitor your vision and eye health.
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- Last Reviewed on 10/14/2011
- Steven D. Ehrlich, NMD, Solutions Acupuncture, a private practice specializing in complementary and alternative medicine, Phoenix, AZ. Review provided by VeriMed Healthcare Network.
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