Macular Degeneration
font-size

Home

Dr. Rundquist

Low Vision Services

Low Vision Devices

Visual Impairments

Insurances / Low Vision Links

FAQs

Age-Related Macular Degeneration (AMD)

What is age-related macular degeneration (AMD)?

Age-related macular degeneration (AMD) is a disease that affects an individual's central vision. AMD is the most common cause of severe vision loss among people over 60. Because only the center of vision is affected, people rarely go blind from this disease. However, AMD can make it difficult of read, drive, or perform other daily activities that require fine, central vision.

AMD occurs when the macula, which is located in the center of the retina and provides us with sight in the center of our field of vision, begins to degenerate. With less of the macula working, central vision - which is necessary for driving, reading, recognizing faces, and performing close-up work - begins to deteriorate.

What are the different types of AMD?

There are two primary types of AMD:

macular-degeneration3

bullet-point 

Dry macular degeneration AMD
This type of AMD is the most common. While its cause is unknown, it occurs as the light sensitive cells in the macula slowly deteriorate, generally occurring in one eye at a time.
 

bullet-point 

Wet macular degeneration AMD
This type of AMD is less common, but accounts for almost all severe vision loss caused by either type of AMD. Wet AMD occurs when new blood vessels behind the retina start to grow beneath the retina where they leak fluid and blood and can create a large blind spot in the center of the visual field. If this happens, there is a marked disturbance of vision in a short period of time.

What are the symptoms of AMD?

The following are the most common symptoms of AMD. However, each individual may experience symptoms differently. Symptoms may include:

bullet-point 

blurry or fuzzy vision

bullet-point 

difficulty recognizing familiar faces

bullet-point 

straight lines, such as sentences on a page, telephone poles, and the sides of buildings, appear wavy

bullet-point 

a dark or empty area (blind spot) appears in the center of vision

bullet-point 

rapid loss of central vision - vision necessary for driving, reading, recognizing faces, and performing close-up work

The presence of drusen, tiny yellow deposits in the retina, is one of the most common early signs of AMD. These will be visible to your physician during an eye examination. While the presence of drusen alone does not indicate the disease, it may mean the eye is at risk for developing more severe AMD.

The symptoms of AMD may resemble other eye conditions. Consult a physician for diagnosis.

How is macular degeneration AMD diagnosed?

In addition to a complete medical history and eye examination, your eye care professional may perform the following tests to diagnose AMD:

bullet-point 

Visual acuity test - the common eye chart test (see right), which measures vision ability at various distances.

bullet-point 

Pupil dilation - the pupil is widened with eye drops to allow a close-up examination of the eye's retina.

bullet-point 

Amsler grid - used to detect wet AMD, this diagnostic test uses a checkerboard-like grid (reduced size shown here; normal vision on the left and vision with AMD on the right) to determine if the straight lines in the pattern appear wavy or missing to the patient - both indications may signal the possibility of AMD.

 

amsler-grid

bullet-point 

Fluorescein angiography - used to detect wet AMD, this diagnostic test involves a special dye injected into a vein in the arm. Pictures are then taken as the dye passes through the blood vessels in the retina, helping the physician evaluate if the blood vessels are leaking and whether or not the leaking can be treated.

What are the risk factors for AMD?

Possible risk factors for AMD include:

bullet-point 

gender
According to some studies, women are at greater risk than men.

bullet-point 

age
Although AMD can occur during middle age, the risk for developing the disease increases as a person ages. Studies have shown that while persons in their 50s have only a two percent risk of developing AMD, that rises to nearly 30 percent in persons over 75.

bullet-point 

smoking
Recent studies have shown that smoking is a major risk factor for age-related macular degeneration.

bullet-point 

family history
Persons with a family history of AMD may have a higher risk of developing AMD.

bullet-point 

hypertension and cardiovascular disease

bullet-point 

obesity
Studies have indicated that obesity may be linked to the progression of AMD.

bullet-point 

high blood cholesterol levels
Persons with elevated blood cholesterol levels may be at higher risk for wet AMD.

Treatment for AMD:

Specific treatment for AMD will be determined by your physician based on:

bullet-point 

your age, overall health, and medical history

bullet-point 

extent of the disease

bullet-point 

your tolerance for specific medications, procedures, or therapies

bullet-point 

expectations for the course of the disease

bullet-point 

your opinion or preference

Treatment for wet AMD may include one type of laser surgery in which a high energy beam of light is aimed directly onto the leaking blood vessels to deter further leaking.
Currently, there is no treatment for dry AMD. This does not, however, indicate that sight will automatically be lost, particularly if the AMD affects only one eye. Central vision may eventually be lost or diminished, but generally the rate of loss is slow.

footer
online-media

Website hosted and designed by Online Media, Inc.