Age-Related Macular Degeneration
What is age-related macular degeneration?
Age-related macular degeneration (AMD) is a disease that affects a person’s central vision. AMD is the most common cause of severe loss of eyesight among people ages 60 and older. Only the center of vision is affected with this disease. People rarely go blind from it. However, AMD can make it difficult to read, drive, or do other daily activities that require fine, central vision.
AMD happens when the macula begins to break down. The macula is located in the center of the retina and provides us with sight in the center of our field of vision. With less of the macula working, central vision begins to get worse.
What causes age-related macular degeneration?
The two primary types of AMD have different causes:
Dry. This type of AMD is the most common. Its cause is unknown. This happens as the light sensitive cells in the macula slowly break down. It generally happens in one eye at a time. It is thought that the age-related thickening of the tissue under the retina contributes to dry AMD.
Wet. This type of AMD is less common. It makes up for almost all severe loss of eyesight caused by either type of AMD. Wet AMD happens when new blood vessels behind the retina start to grow beneath the retina. They leak fluid and blood and can create a large blind spot in the center of the visual field.
Who is at risk for macular degeneration?
Possible risk factors for AMD are:
- Ages 60 and older
- Family history
- High blood pressure or hypertension
- Cardiovascular disease
- High blood cholesterol levels
What are the symptoms of age-related macular degeneration?
The following are the most common symptoms of AMD. However, each individual may experience symptoms differently. Symptoms may include:
- Blurry or fuzzy vision
- Difficulty recognizing familiar faces
- Straight lines appear wavy
- A dark, empty area or blind spot appears in the center of vision
- Rapid loss of central vision, which is necessary for driving, reading, recognizing faces, and performing close-up work
The presence of drusen, tiny yellow deposits in the retina, is one of the most common early signs of AMD. It may mean the eye is at risk for developing more severe AMD. These will be visible to your doctor during an eye exam.
The symptoms of AMD may look like other eye conditions. Talk with an eye care professional for diagnosis.
How is age-related macular degeneration diagnosed?
In addition to a complete medical history and eye exam, your eye doctor may do the following tests to diagnose AMD:
Visual acuity test. The common eye chart test, which measures vision ability at various distances.
Pupil dilation. The pupil is widened with eye drops to allow a close-up examination of the eye’s retina.
Amsler grid. Used to detect wet AMD, this test uses a checkerboard-like grid to determine if the straight lines in the pattern appear wavy or missing to the patient. Both indications may signal the possibility of AMD.
Fluorescein angiography. Used to detect wet AMD, this diagnostic test involves a special dye injected into a vein in the arm. Pictures are then taken as the dye passes through the blood vessels in the retina, helping the doctor evaluate if the blood vessels are leaking and whether or not the leaking can be treated.
How is age-related macular degeneration treated?
Specific treatment for AMD will be determined by your doctor based on:
- Your age, overall health, and medical history
- Extent of the disease
- Your tolerance for specific medications, procedures, or therapies
- Expectations for the course of the disease
- Your opinion or preference
Treatment for wet AMD may include one type of laser surgery in which a high energy beam of light is aimed directly onto the leaking blood vessels to deter further leaking.
Currently, there is no treatment for dry AMD. This does not, however, indicate that sight will automatically be lost, particularly if the AMD affects only one eye. Central vision may eventually be lost or diminished, but generally the rate of loss is slow.
What are the complications of age-related macular degeneration? AMD can result in severe loss of central vision, but rarely blindness. It can, however, make it difficult to read, drive, or perform other daily activities that require fine, central vision.
Living with macular degenerationIf you have already had some loss of vision, ask your provider for information on services for people with low vision and devices that may help you with your everyday tasks.
When should I call my health care provider?If your symptoms get worse or you have new symptoms, notify your health care provider.
Key points about age-related macular degeneration
- Age-related macular degeneration is a disease that affects a person’s central vision
- AMD can result in severe loss of central vision, but people rarely go blind from it
- Risk factors for AMD include being ages 60 and older, being a woman, smoking, high blood pressure, cardiovascular disease, obesity, and high cholesterol
- Although there is no cure for AMD, there are treatment options that may prevent or slow the progression of the disease
Next stepsTips to help you get the most from a visit to your health care provider:
- Before your visit, write down questions you want answered.
- Bring someone with you to help you ask questions and remember what your provider tells you.
- At the visit, write down the names of new medicines, treatments, or tests, and any new instructions your provider gives you.
- If you have a follow-up appointment, write down the date, time, and purpose for that visit.
- Know how you can contact your provider if you have questions.
- Berry, Judith, PhD, APRN
- Bogus, William J., OD, FAAO