degeneration (ARMD) is a disease that
affects central vision. It is a common
cause of vision loss in people over age
60. Only the center of your vision is
affected, so people rarely go blind from
the disease. However, ARMD can make
detailed tasks such as reading and
The macula is the center of the retina that contains many nerve cells. They transform light into signals that tell the brain what you are seeing. There are 2 forms of ARMD-dry and wet. Dry ARMD affects 90% of those with the disease and its cause is unknown. Slowly the light sensitive cells within the macula break down and less of the macula functions.
Wet ARMD is responsible for severe vision loss from the disease. It occurs when new blood vessels under the retina start growing toward the macula. These new vessels tend to be fragile and often leak blood and fluid under the macula. This causes rapid damage and leads to central vision loss.
People over the age of 75 have a 30% risk of developing ARMD. Smoking and family history have both been linked to increased risk. Visual symptoms include blurred or distorted vision.
Currently, dry ARMD cannot be treated. Wet ARMD is usually treated with conventional laser applied to the blood vessels. Some cases of wet ARMD can be treated with a new procedure called photodynamic therapy. This involves injecting a dye called Visudyne into the bloodstream. This special drug is activated by a laser beam, which causes the blood vessels to shrink. It is important to realize that any laser therapy is not a cure but a treatment to help stop further vision loss. The risk of new blood vessels growing back is relatively high.
New research in the
Age-Related Eye Disease Study (AREDS)
has shown high levels of anti-oxidants
and zinc can lower the risk of ADVANCED
ARMD by 25%. These same nutrients can
also reduce the risk of vision loss by
19%. People who are at high risk for
developing the advanced form of ARMD
should consider taking the formulation
recommended by the AREDS study.
In other studies, Lutein and Zeaxanthin, which is a carotenoid plant substance that is found in the macular pigment, have also been linked to decreasing the risk of developing ARMD in the non-advanced form. These substances can be found naturally in dark green leafy vegetables and in dietary supplements. We advise a dilated eye examination and discussion with our doctors before choosing a dietary supplement to help identify your risk characteristics. Your family physician should also be contacted to insure these supplements will not interfere with other medications or systemic conditions you may have.