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Conditions InDepth: Macular Degeneration

Macular degeneration is a chronic and usually progressive disorder that affects the central part of the retina (the macula) and causes reduced ability to see. Macular degeneration causes a gradual loss of sharp, central vision.

Macular Degeneration

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Macular degeneration is the leading cause of blindness in older adults in the United States. The frequency of this disorder increases with age. The majority of affected people are aged 75-80 years old.

Adult macular degeneration (AMD), which is the most common form of macular degeneration, occurs in two main forms:

Dry Macular Degeneration

Ninety percent of people with AMD have this type. An area of the retina is affected, which leads to slow breakdown of cells in the macula and a gradual loss of central vision. Dry AMD sometimes occurs in one eye first, but usually affects both eyes eventually.

Wet Macular Degeneration

Although only 10% of all people with AMD have this type, it accounts for 90% of all blindness from the disease. As dry AMD progresses, new blood vessels may begin to grow and cause “wet” AMD. These new blood vessels often leak blood and fluid under the macula. This causes rapid damage to the macula that can lead to significant loss of central vision in a short time.

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References:

Age-related macular degeneration. EBSCO DynaMed website. Available at:
...(Click grey area to select URL)
Updated May 23, 2013. Accessed July 15, 2013.
Age-related macular degeneration. National Eye Institute website. Available at:
...(Click grey area to select URL)
Accessed July 15, 2013.
An overview of macular degeneration. Macular Degeneration Foundation website. Available at:
...(Click grey area to select URL)
Accessed July 15, 2013.
What is macular degeneration? American Macular Degeneration Foundation website. Available at:
...(Click grey area to select URL)
Accessed July 15, 2013.
Last reviewed May 2014 by Michael Woods, MD
Last Updated: 5/17/2014