Age-related macular degeneration (ARMD); AMD; Vision loss - AMD DefinitionMacular degeneration is an eye disorder that slowly destroys sharp, central vision. This makes it difficult to see fine details and read. The disease is most common in people over age 60, which is why it is often called age-related macular degeneration (ARMD or AMD). CausesThe retina is at the back of the eye. It changes light and images that enter the eye into nerve signals that are sent to the brain. A part of the retina called the macula makes vision sharper and more detailed. It is a yellow spot in the center of the retina. It has a high amount of two natural colors (pigments) called lutein and zeaxanthin. AMD is caused by damage to the blood vessels that supply the macula. This change also harms the macula. There are two types of AMD:
Health care providers are not sure what causes AMD. The condition is rare before age 55. It occurs mostly in people 75 years or older. Risk factors for AMD are:
SymptomsYou may not have any symptoms at first. As the disease gets worse, you may have problems with your central vision. SYMPTOMS OF DRY AMD The most common symptom of dry AMD is blurred vision. Objects in the center part of your vision often look distorted and dim, and colors look faded. You may have trouble reading print or seeing other details. But you can see well enough to walk and do most daily activities. As dry AMD gets worse, you may need more light to read or do everyday tasks. A blurred spot in the center of vision gradually gets larger and darker. In the later stages of dry AMD, you may not be able to recognize faces until they are close. SYMPTOMS OF WET AMD The most common early symptom of wet AMD is that straight lines look distorted and wavy. There may be a small dark spot in the center of your vision that gets larger over time. With both types of AMD, central vision loss can occur quickly. If this happens, you will need to be seen right away by an ophthalmologist. Make sure this eye doctor has experience in treating problems with the retina. Exams and TestsYou will have an eye exam. Drops will be placed into your eyes to widen (dilate) your pupils. Your eye doctor will use special lenses to view your retina, blood vessels, and optic nerve. Your eye doctor will look for specific changes in the macula and blood vessels and for drusen. You may be asked to cover one eye and look at a pattern of lines called an Amsler grid. If the straight lines look wavy, it may be a sign of AMD. The American Macular Degeneration Foundation has an Amsler grid you can download along with instructions for how to check your vision. Other tests that may be done include:
TreatmentIf you have advanced or severe dry AMD, no treatment can restore your vision. If you have early AMD and do not smoke, a combination of certain vitamins, antioxidants, and zinc may prevent the disease from getting worse. But it cannot give you back vision that is already lost. The combination is often called the "AREDS" formula. The supplements contain:
Only take this vitamin combination if your eye doctor recommends it. Make sure your eye doctor knows about any other vitamins or supplements you are taking. Smokers should not use this supplement. AREDS may also benefit you if you have a family history and risk factors for AMD. Lutein and zeaxanthin, which are substances found in green leafy vegetables, may also decrease your risk for age-related macular degeneration. If you have wet AMD, your eye doctor may recommend:
Low-vision aids (such as special lenses) and therapy can help you use the vision that you have more effectively, and improve your quality of life. Close follow-up with your eye doctor is important.
Early detection of vision changes is important because the sooner you are treated, the better your outcome. Early detection leads to earlier treatment and often, a better outcome. The best way to detect changes is by self-testing at home with the Amsler grid. Your eye doctor can give you a copy of the grid or you can print one from the Internet. Test each eye individually while wearing your reading glasses. If the lines look wavy, call your eye doctor right away for an appointment. Treatments in development: Stem cell research is showing some promise in restoring some vision in AMD. But this type of treatment is still years away at this point. Similarly, gene therapy may also have a place in the treatment of AMD. Levodopa, while most commonly used to treat Parkinson disease, may have a beneficial effect on wet AMD. Support GroupsThese resources may provide more information on macular degeneration:
Outlook (Prognosis)AMD does not affect side (peripheral) vision. This means complete vision loss never occurs. AMD results in the loss of central vision only. Mild, dry AMD usually does not cause disabling central vision loss. Wet AMD often leads to significant vision loss. In general, with AMD you may lose the ability to read, drive a car, and recognize faces at a distance. But most people with AMD can carry out daily tasks without much difficulty. When to Contact a Medical ProfessionalIf you have AMD, your eye doctor may recommend that you check your vision every day with an Amsler grid. Contact your provider right away if the lines look wavy. Also contact your eye doctor if you notice other changes in your vision. PreventionAlthough there is no known way to prevent macular degeneration, leading a healthy lifestyle can reduce your risk of developing AMD:
See your eye doctor regularly for dilated eye exams. ReferencesAmerican Academy of Ophthalmology website. AAO PPP Retina/Vitreous Committee, Hoskins Center for Quality Eye Care. Preferred Practice Pattern Guideline. Age-related macular degeneration PPP 2019. www.aao.org/preferred-practice-pattern/age-related-macular-degeneration-ppp. Updated October 2019. Accessed August 7, 2023. Chaikitmongkol V, Bressler NM, Bressler SB. Age-related macular degeneration: non-neovascular early AMD, intermediate AMD, and geographic atrophy. In: Sadda SR, Sarraf D, Freund B, et al, eds. Ryan's Retina. 7th ed. Philadelphia, PA: Elsevier; 2023:chap 66. Jacoba CMP, Kim IK, Roh M. Age-related macular degeneration. In: Yanoff M, Duker JS, eds. Ophthalmology. 6th ed. Philadelphia, PA: Elsevier; 2023:chap 6.24. Pugazhendhi A, Hubbell M, Jairam P, Ambati B. Neovascular macular degeneration: A review of etiology, risk factors, and recent advances in research and therapy. International Journal of Molecular Sciences. 2021;22(3):1170. PMID: 33504013 pubmed.ncbi.nlm.nih.gov/33504013/. | ||
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Review Date: 8/4/2023 Reviewed By: Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. View References The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited. | ||
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