Dry
Macular
Degeneration -- To understand Macular
Degeneration, it's
important to learn about several layers of the eye:
the choroid, Bruch's membrane, and the retinal pigment
epithelium. The choroid supplies blood and other
nutrients to the overlying retina. The choroid is
covered by a thin membrane called Bruch's membrane. On
top of Bruch's membrane lies the retinal pigment epithelium.
In the earliest
stages of this disease, yellow deposits called drusen form
beneath the retina. Drusen are considered to be the dry
form of Macular Degeneration and usually do not affect
vision. However, when drusen expand in size and number,
they can distort vision. When present for a long time,
drusen may cause the macula to thin and stop
functioning. This is know as Atrophic Dry
Macular Degeneration.
This tissue
degeneration triggers
a slow
and progressive loss of central vision.
Some people with this form will detect "blank" areas
in their central vision.
Dry Macular Degeneration is more common than the wet
form, occurring in
approximately 90% of people with the condition. Since
the dry form can progress to the wet form, it is important to
monitor your vision daily with a tool called and Amsler Grid. See
Grid on page 5.
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