Macular Degeneration - Age-related

Symptoms

You 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 Tests

You will have an eye exam. Drops will be placed into your eyes to widen (dilate) your pupils. The eye doctor will use special lenses to view your retina, blood vessels, and optic nerve.

The 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.

Other tests that may be done include:

• Using special dye and camera to look at blood flow in the retina (fluorescein angiogram)
• Taking a photo of the inner lining of the eye (fundus photography)
• Using light waves to view the retina (optical coherence tomography)
• A test that measures the pigment in the macula

Treatment

If 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:

• 500 milligrams (mg) of vitamin C
• 400 international units of beta-carotene
• 80 mg of zinc
• 2 mg of copper

Only take this vitamin combination if your doctor recommends it. Make sure your 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 of age-related macular degeneration.

If you have wet AMD, your doctor may recommend:

• Laser surgery (laser photocoagulation) -- a small beam of light destroys the leaking, abnormal blood vessels.
• Photodynamic therapy -- a light activates a drug that is injected into your body to destroy leaking blood vessels.
• Special medicines that prevent new blood vessels from forming in the eye are injected into the eye (this is a painless process).

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.

• For dry AMD, visit your eye doctor once a year for a complete eye exam.
• For wet AMD, you likely need frequent, perhaps monthly, follow-up visits.

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.

Support Groups

These resources may provide more information on macular degeneration:

AMD Alliance International -- www.amdalliance.org

Macular Degeneration Association -- macularhope.org

Macular Degeneration Partnership -- www.amd.org

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 Professional

If you have AMD, your health care provider may recommend that you check your vision every day with an Amsler grid. Call your provider immediately if the lines look wavy. Also call if you notice other changes in your vision.

Prevention

Although there is no known way to prevent macular degeneration, leading a healthy lifestyle can reduce your risk of developing AMD:

• Do not smoke
• Maintain a healthy diet that is high in fruits and vegetables and low in animal fat
• Exercise regularly
• Maintain a healthy weight

See your eye care professional regularly for dilated eye exams.

References

American Academy of Ophthalmology Retina/Vitreous Panel, Hoskins Center for Quality Eye Care. Preferred Practice Pattern Guidelines. Age-related macular degeneration. www.aao.org/preferred-practice-pattern/age-related-macular-degeneration-ppp-2015. Updated January 2015. Accessed October 9, 2017.

Maguire JI. Age-related macular degeneration. In: Gault JA, Vander JF, eds. Ophthalmology Secrets in Color. 4th ed. Philadelphia, PA: Elsevier; 2015:chap 43.

Wenick AS, Bressler NM, Bressler SB. Age-related macular degeneration: non-neovascular early AMD, intermediate AMD, and geographic atrophy. In: Schachat AP, Wilkinson CP, Hinton DR, Sadda SR, Wiedemann P, eds. Ryan's Retina. 6th ed. Philadelphia, PA: Elsevier; 2018:chap 68.