AMD was once thought to be an unpreventable part of aging. However, we now know that lifestyle plays a very large role in whether an individual will develop AMD. Analysis from The Human Genome Project, the international scientific research project whose goal was to identify the approximately 20,000 to 25,000 genes in human DNA and determine the sequences of the 3 billion chemical base pairs that make up human DNA, has discovered that three genes cause 90 percent of all cases of AMD. Outside a few major genetic research centers, testing for these genes is not possible. However even a person with all three genes may not get AMD if he or she takes preventive steps; likewise a person with none of these genes may get severe AMD if he or she smokes.
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