What Causes It?
The macula, a part of your eye's retina, is made of cells, called rods and cones, which are sensitive to light and are 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 do not 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 do not 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.
There is no known cure for AMD, however, there are things 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.
Wear sunglasses, hats, and visors when exposed to the sun.
For wet AMD, a type of medication called antivascular 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
- How healthy the macula is
Photodynamic therapy is 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 does not 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.Nutrition
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 high dose, like the 80 mg used in this formulation, 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
- 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 a 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.
Help reduce risk of 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 at risk for, heart disease. The doses used were:
- Vitamin B6 (50 mg daily)
- Vitamin B12 (1,000 mcg per day)
- Folic acid (2,500 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 is safe to eat more fish, although you may want to eat fish with lower levels of mercury.
Women who are pregnant or breastfeeding are advised to eat no more than 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 bloodthinners, such as warfarin (Coumadin) or aspirin. Herbs
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 to 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 bloodthinners, such as warfarin (Coumadin), clopidogrel (Plavix), aspirin, or any other medication that decreases clotting, should not take ginkgo without talking to their doctor.
- Bilberry (Vaccinium myrtillus), 120 to 240 mg, 2 times per day, and grape seed (Vitis vinifera), 50 to 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), aspirin, or any other medication that decreases clotting, 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.
- Milk thistle. 150mg, 2 to 3 times per day. Silymarin, from milk thistle, is a major supporter of liver function. The liver is a key organ for maintenance of eye health because the fat soluble vitamins and the B vitamins are stored there. There is some concern that milk thistle compounds have estrogen-like effects in the body. If you have hormone-sensitive issues, you should discuss the risks and benefits with your physician.The same holds true for people taking any prescription medication since milk thistle exerts its influence via the liver and that is where the majority of medications are metabolized. If you have an allergy to ragweed, you may also react to milk thistle. Speak to your doctor.
Ahmadi MA, Lim JI. Pharmacotherapy of age-related macular degeneration. Expert Opin Pharmacother. 2008;9(17):3045-52.
Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8. Arch Ophthalmol. 2001;119(10):1417-36.
Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 9. Arch Ophthalmol. 2001;119(10):1439-52.
Augood C, et al. Oily fish consumption, dietary docosahexaenoic acid and eicosapentaenoic acid intakes, and associations with neovascular age-related macular degeneration. Am J Clin Nutr. 2008;88(2):398-406.
Bartlett HE, Eperjesi F. Effect of lutein and antioxidant dietary supplementation on contrast sensitivity in age-related macular disease: a randomized controlled trial. Eur J Clin Nutr. 2007 Sep;61(9):1121-7.
Bone RA, Landrum JT, Guerra LH, Ruiz CA. Lutein and zeaxanthin dietary supplements raise macular pigment density and serum concentrations of these carotenoids in humans. J Nutr. 2003;133(4):992-8.
Cai J, Nelson KC, Wu M, Sternberg P Jr, Jones DP. Oxidative damage and protection of the RPE. Prog Retin Eye Res. 2000;19(2):205-21.
Carpentier S, Knaus M, Suh M. Associations between lutein, zeaxanthin, and age-related macular degeneration: an overview. Crit Rev Food Sci Nutr. 2009;49(4):313-26.
Chang CW, Chu G, Hinz BJ, Greve MD. Current use of dietary supplementation in patients with age-related macular degeneration. Can J Opthalmol. 2003;38(1):27-32.
Cho E, Hung S, Willet WC, et al. Prospective study of dietary fat and the risk of age-related macular degeneration. Am J Clin Nutr. 2001;73(2):209-18.
Christen WG, Glynn RJ, Chew EY, Albert CM, Manson JE. Folic acid, pyridoxine, and cyanocobalamin combination treatment and age-related macular degeneration in women: The Women's Antioxidant and Folic Acid Cardiovascular Study. Arch Intern Med. 2009;169(4):335-41.
Coleman H, Chew E. Nutritional supplementation in age-related macular degeneration. Curr Opin Ophthalmol. 2007 May;18(3):220-3. Review.
Cong R, Zhou B, Sun Q, Gu H, Tang N, Wang B. Smoking and the risk of age-related macular degeneration: a meta-analysis. Ann Epidemol. 2008;18(8):647-56.
Diamond BJ, Shiflett SC, Feiwell N, Matheis RJ, Noskin O, Richards JA, et al. Ginkgo biloba extract: mechanisms and clinical indications. Arch Phys Med Rehabil. 2000;81(5):668-78.
Eat fish and protect against MD. Health News. 2006 Sep;12(9):8.
Evans JR. Antioxidant vitamin and mineral supplements for age-related macular degeneration. Cochrane Database Syst Rev. 2002;20:CD000254.
Falsini B, Piccardi M, Iarossi G, Fadda A, Merendino E, Valentini P. Influence of short-term antioxidant supplementation on macular function in age-related maculopathy: a pilot study including electrophysiologic assessment. Ophthalmology. 2003;110(1):51-60;discussion 61.
Ferri. Ferri's Clinical Advisor 2016. 1st ed. Philadelphia, PA: Elsevier Mosby. 2016.
Fies P, Dienel A. [Ginkgo extract in impaired vision – treatment with special extract Egb 761 of impaired vision due to dry senile macular degeneration]. Wiedn Med Wochenschr. 2002;152(15-16):423-6.
Flood V, Smith W, Wang JJ, Manzi F, Webb K, Mitchell P. Dietary antioxidant intake and incidence of early age-related maculopathy: the Blue Mountains Eye Study. Ophthalmology. 2002;109(12):2272-8.
Gohel P, Mandava N, Olson J, Durairaj V, Age-related Macular Degeneration: An Update on Treatment. Amer J of Med. 2008;121(4).
Hambridge M. Human zinc deficiency. J Nutr. 2000;130(5S suppl):1344S-9S.
Heber D, Bowerman S. Applying science to changing dietary patterns. J Nutr. 2001;131(11 Suppl):3078-81S.
Hodge WG, Barnes D, Schachter HM, Pan YI, Lowcock EC, Zhang L, et al. Evidence for the effect of omega-3 fatty acids on progression of age-related macular degeneration: a systematic review. Retina. 2007 Feb;27(2):216-21. Review.
Hyman L, Neborsky R. Risk factors for age-related macular degeneration: an update. Burr Opin Ophthalmol. 2002;13(3):171-5.
Jones AA. Age related macular degeneration--should your patients be taking additional supplements? Aust Fam Physician. 2007 Dec;36(12):1026-8.
Kuzniarz M, Mitchell P, Flood VM, Wang JJ. Use of vitamin and zinc supplements and age-related maculopathy: the Blue Mountains Eye Study. Ophthalmic Epidemiol. 2002;9(4):283-95.
Landrum JT, Bone RA. Lutein, zeaxanthin, and the macular pigment. Arch Biochem Biophys. 2001;385(1):28-40.
Lim LS, Mitchell P, Seddon JM, Holz FG, Wong TY. Age-related macular degeneration. Lancet. 2012; 379(9827):1728-38.
Ma L, Dou HL, Wu YQ, Huang YM, Huang YB, Xu XR, Zou ZY, Lin XM. Lutein and zeaxanthin intake and the risk of age-related macular degeneration: a systematic review and meta-analysis. Br J Nutr. 2011 Sep 8:1-10. [Epub ahead of print]
Ma L, Yan SF, Huang YM, et al. Effect of lutein and zeaxanthin on macular pigment and visual function in patients with early age-related macular degeneration. Ophthalmology. 2012;119(11):2290-7.
Mataix J, Desco MC, Palacios E, Garcia-Pous M, Navea A. Photodynamic therapy for age-related macular degeneration. Ophthalmic Surg Lasers Imaging. 2009;40(3):277-84.
McBee WL, Lindblad AS, Ferris III FL. Who should receive oral supplement treatment for age-related macular degeneration? Curr Opin Ophthalmol. 2003;14(3):159-62.
Merle B, Delyfer MN, Korobelnik JF, Rougier MB, Colin J, Malet F, Féart C, Le Goff M, Dartigues JF, Barberger-Gateau P, Delcourt C. Dietary omega-3 fatty acids and the risk for age-related maculopathy: the Alienor Study. Invest Ophthalmol Vis Sci. 2011 Jul 29;52(8):6004-11.
Michels S, Kurz-Levin M. Age-related macular degeneration (AMD). Ther Umsch. 2009;66(3):189-95.
Morris MS, Jacques PF, Chylack LT, Hankinson SE, Willett WC, Hubbard LD, Taylor A. Intake of zinc and antioxidant micronutrients and early age-related maculopathy lesions. Ophthalmic Epidemiol. 2007 Sep-Oct;14(5):288-98.
Peeters A, Magliano DJ, Stevens J, Duncan BB, Klein R, Wong TY. Changes in abdominal obesity and age-related macular degeneration: the Atherosclerosis Risk in Communities Study. Arch Ophthalmol. 2008;126(11):1554-60.
Rakel. Integrative Medicine. 3rd ed. Philadelphia, PA: Elsevier Saunders. 2012.
Rakel. Textbook of Family Medicine. 8th ed. Philadelphia, PA: Elsevier Saunders. 2011.
Robman L, Vu H, Hodge A, Tikellis G, Dimitrov P, McCarty C, Guymer R. Dietary lutein, zeaxanthin, and fats and the progression of age-related macular degeneration. Can J Ophthalmol. 2007 Oct;42(5):720-6.
Seddon JM. Multivitamin-multimineral supplements and eye disease: age-related macular degeneration and cataract. Am J Clin Nutr. 2007 Jan;85(1):304S-307S. Review.
Seddon JM, Rosner B, Sperduto RD, Yannuzzi L, Haller JA, Blair NP, Willett W. Dietary fat and risk for advanced age-related macular degeneration. Arch Opthalmol. 2001;119(8):1191-9.
Supplements may slow age-related macular degeneration. Mayo Clin Health Lett. 2002;20(3):4.
Supplements slow the course of macular degeneration. Harv Womens Health Watch. 2001;9(5):1-2.
Trieschmann M, Beatty S, Nolan JM, Hense HW, Heimes B, Austermann U, et al. Changes in macular pigment optical density and serum concentrations of its constituent carotenoids following supplemental lutein and zeaxanthin: the LUNA study. Exp Eye Res. 2007 Apr;84(4):718-28.