Hello and thanks for your question. The PDT laser that utilizes Visudyne is functionally altogether different from a thermal (or photocoagulative) laser that was used on your right eye. A photocoagulative laser uses heat to burn (and therefore destroy) a small area of the retina. As you know this is intended to cause the destruction of a small part of the retina; function follows form and if there is a larger than desired area destroyed by this laser, or this area happens to incorporate a part of the retina which is crucial for good central vision, then a loss of central vision can certainly result.
Thankfully, the PDT / Visudyne therapy is not a photocoagulative laser. Rather, the Visudyne is a light-activated molecule that when injected into the IV, and travels to the blood vessels in the retina, is activated by the particular wavelength of laser emitted by the PDT. This causes a chemical change in the structure of the molecule in Visudyne which fosters closure of abnormal blood vessels in the retina. But it is not photocoagulative in nature. Therefore the chances of you have significant vision loss from this PDT laser are much, much lower than the likelihood that a photocoagulative laser would cause vision loss.
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