Abnormal blood vessels develop in diabetes because the retina senses that it isn't getting enough blood. This is because diabetes damages the abnormal blood vessels of the retina. As a result...the retina releases a chemical which causes these abnormal blood vessels to grow (the chemical is called VEGF)Laser works by destroying the less important retina...away from the center...as a result...the eye feels that there is less retina not getting enough blood...and therfore the retina releases less VEGF! Since there is less VEGF being produced...there is less stimulus for the abnormal blood vessels to grow.
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