| Visudyne Therapy
Even
with Visudyne Therapy there may be some loss of vision.
However, it's less severe than laser photocoagulation or no
treatment at all. And, Visudyne Therapy cannot restore
lost vision.
In Visudyne
Therapy, a light-activated drug known as Visudyne (verteporfin
for
injection) is injected into the bloodstream. The drug
travels in the bloodstream and collects in the abnormal blood
vessels, where it is activated by a non-thermal laser (a laser
that does not burn the retina). This produces a reaction
that closes the abnormal vessels without causing damage to the
overlying retina.
Visudyne
Therapy is a multi-course treatment. The desired result
cannot be achieved with just one or two treatments.
Multiple treatments are necessary because leakage often
reoccurs and the abnormal blood vessels may return after
treatment. However, Visudyne can be reapplied at up to
three-month intervals, if necessary. A typical treatment
schedule for eligible AMD patients is
three treatments in the first year, two times in the second
year, and one to two treatments in the third year.
1. The
verteporfin drug is administered through an injection into the
patient's arm.
2. The
drug circulates throughout the body and attaches itself to the
low-density lipoproteins (LDL).
3. The
abnormal vessels attract and absorb the LDL-Visudyne complex.
4. The
drug accumulates in the abnormal vessels.
5. A
non-heat-product laser is shined into the back of the eye at the
abnormal vessels, activating the drug.
6. The
activated drug damages the abnormal vessels.
7. The
abnormal vessels are destroyed.
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