What
is ARMD?
The macula is a small area at the centre of the retina that provides
the sharp, central vision we need for reading, driving and seeing fine detail.
Macular degeneration refers to the deterioration of the macula.
Why
Is It Important?
Macular degeneration can cause gradual or sudden, severe
and often irreversible loss of vision in the middle of your visual field.
Symptoms:
Reduction of vision in the central part of the retina causing difficulty in reading
or recognizing peoples faces
It usually does not affect the eye's side,
or peripheral, vision
If you notice words looking blurry on a page,
a dark or empty area in the center of your vision, or crookedness of straight
lines, you may have symptoms of macular degeneration
Types
The
two types of ARMD are "dry" (atrophic) and "wet" (exudative):
"Dry" Macular Degeneration (atrophic)
Most people have the "dry"
form of ARMD. It is caused by aging and thinning of the tissues of the macula.
Vision loss is usually gradual.
"Wet"
Macular Degeneration (exudative)
The "wet" form of macular degeneration
accounts for about 10% of all ARMD cases.
Wet ARMD results when abnormal blood
vessels form underneath the retina at the back of the eye leak fluid or
blood
and blur central vision. Vision loss may be rapid and severe.
What
You Need To Do:
Get regular eye checkups from an ophthalmologist, especially
yearly after 50. Avoid smoking, uncontrolled hypertension and prolonged exposure
to bright sunlight as these increase the risk of macular degeneration. You can
detect early stages of macular degeneration by using a simple vision test using
a chart called the Amsler grid.
Macular degeneration
cannot be reversed. Its impact, however, can be reduced
Laser surgery and
medications can be used to treat certain types of macular degeneration.
Certain
types of "wet" macular degeneration can be treated with Injections -
They target 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.
The recent development of anti-VEGF medications have become an exciting advance
in the treatment of wet ARMD.
Bevacizumab (Avastin)
and Ranibizumab (Lucentis) are two very useful drugs. Most patients will retain
the vision they have and some will regain some of the lost vision after these
treatments.
These procedures may preserve more sight
overall, though they are not cures that restore vision to normal.
Despite
advanced medical treatment, most people with macular degeneration still experience
some vision loss.
There should be no delay in taking
the treatment advised by the retinal surgeon.
Many older
people develop macular degeneration as part of the body's natural aging process.
Exactly why it develops is not known, and no treatment has been uniformly effective.