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Photodynamic therapy is a new treatment that
has just been approved by the Food and Drug Administration for its use in
patients with "wet" macular degeneration.
In this procedure, a light-sensitive drug
called Visudyne is injected into the patient's bloodstream. The drug circulates
throughout the blood vessels, including the abnormal vessels growing beneath
the eye's retina. Once the drug has had time to permeate the tiny vessels
beneath the retina, the light of a low-intensity laser is shined into the
eye. The Visudyne absorbs the light, destroying the abnormal or leaky vessels.
Photodynamic therapy has an advantage over the currently used photocoagulation
technique because less heat is required from the laser, meaning that healthy
tissues around the site of the procedure receive less "collateral damage.
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