Macular Degeneration

What is macular degeneration?

Macular degeneration is deterioration or breakdown of the macula. The macula is a small area in the retina at the back of the eye that allows you to see fine details clearly and perform activities such as reading and driving. When the macula does not function correctly, blurriness, dark areas or distortion can affect your central vision. Macular degeneration affects your ability to see near and far, and can make some activities-like threading a needle, or reading, difficult or impossible.

Although macular degeneration reduces vision in the central part of the retina, it usually does not affect the eye's side, or peripheral, vision. For example, you could see the outline of a clock but not be able to tell what time it is.

Macular degeneration alone does not result in total blindness. Even in more advanced cases, people continue to have some useful vision and are often able to take care of themselves. In many cases macular degeneration's impact on your vision can be minimal.

What causes macular degeneration?

Many older people develop macular degeneration as part of the body's natural aging process. There are different kinds of macular problems, but the most common is age-related macular degeneration (AMD). Exactly why it develops is not known, and no treatment has been uniformly effective. Macular degeneration is the leading cause of severe vision loss in Caucasians over 65.

The two most common types of AMD are "dry" (atrophic) and "wet" (exudative):

Deposits under the retina called drusen are a common feature of macular degeneration. Drusen alone usually does not cause vision loss, but when they increase in size or number, this generally indicates an increased risk of developing advanced AMD. People at risk for developing advanced AMD have significant drusen, prominent dry AMD, or abnormal blood vessels under the macula in one eye ("wet" form).

What are the symptoms of macular degeneration?

Macular degeneration can cause different symptoms in different people. The condition may be hardly noticeable in its early stages. Sometimes, only one eye loses vision while the other eye continues to see well for many years. But when both eyes are affected, the loss of central vision may be noticed more quickly.

Following are the common ways vision loss is detected:

How is macular generation diagnosed?

Many people do not realize that they have a macular problem until blurred vision becomes obvious. Your ophthalmologist (eye M.D.) can detect early stages of AMD during a medical eye examination that includes the following:

How is macular degeneration treated?

Nutritional Supplements - Although the exact causes of macular degeneration are not fully understood, antioxidant vitamins and zinc may reduce the impact of AMD in some people.

A large scientific study found that people at risk for developing advanced stages of AMD lowered their risk by about 25% when treated with a high-dose combination of vitamin C, vitamin E, beta carotene and zinc. Among those who have either no AMD, or very early AMD, the supplements did not appear to provide an apparent benefit.

It is very important to remember that vitamin supplements are not a cure for AMD, nor will they restore vision that you may have already lost from the disease. However, specific amounts of these supplements do play a key role in helping some people at high risk for advanced AMD to maintain their vision. You should speak with your ophthalmologist to determine if you are at risk for developing advance AMD, and to learn if supplements are recommended for you.

Laser surgery, PDT, and Anti-VEGF treat certain types of "wet" macular degeneration can be treated with laser surgery, a brief outpatient procedure that uses a focused beam of light to slow or stop leaking blood vessels that damage the macula. A treatment called photodynamic therapy (PDT) uses a combination of special drug and laser treatment to slow or stop leaking blood vessels.

Another form of treatment targets a specific chemical in your body that is critical in causing abnormal blood vessels to grow under the retina. That chemical is called vascular endothelial growth factor (VEGF). Anti-VEGF drugs block the trouble-causing VEGF, reducing the growth of abnormal blood vessels and slowing their leakage.

These procedures may preserve more sight overall, though they are not cures that restore vision to normal. Despite advanced medical treatment, many people with macular degeneration degeneration still experience some vision loss.

Adapting to low vision

To help you adapt to lower visions levels, your ophthalmologist can prescribe optical devices, or refer you to a low-vision specialist or center. A wide range of support services and rehabilitation programs are also available to help people with macular degeneration maintain a satisfying lifestyle. Because side a vision is usually not affected, a person's remaining sight is very useful. Often, people can continue with many of their favorite actives by using low-visions optical devices such as magnifying devices, closed circuit television, large-print reading materials, and talking or computer devices.

Resources

For more information on macular degeneration, please contact:

The American Academy of Ophthalmology
(415) 561-8500

The American Macular Degeneration Foundation
(413) 268-7660

Foundation Fighting Blindness
(888) 394-3937

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