Photodynamic therapy (PDT) is a treatment for some cases of the wet form of age-related macular degeneration. It involves injecting a light-sensitive chemical into the arm. The chemical travels to abnormal blood vessels in the retina where it is activated with a special light. The activated chemical destroys the abnormal blood vessels without causing damage to the normal retinal tissues nearby. This allows PDT to be used in some cases where conventional laser treatment would cause too much damage to surrounding retinal tissue.
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PDT can slow the loss of vision and sometimes improve vision.
Your treatment will be performed in a specially equipped laser room in the office. This is not done in the surgery center.
First, your doctor or nurse will inject a drug called Visudyne into a vein in your arm. Your doctor will shine a diode laser light through the slit lamp of a microscope into the your eye, activating the Visudyne drug. You may see flashes of bright light during the procedure. PDT takes about 90 seconds and is painless. Most patients resume normal activities immediately. You'll need to stay out of direct sunlight for at least 24 hours. You may require repeat treatments at a later time to enhance the initial results.
Following treatments, some patients experience a temporary reduction of vision, which will improve over the next few weeks. This is a relatively new procedure. Serious complications with PDT are extremely rare, but like any medical procedure, it does have some risks. Going to a specialist experienced in PDT can significantly minimize the risks.
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