Figure 137

Panretinal photocoagulation (PRP). A, PRP is the therapeutic technique performed for proliferative retinopathy using an argon laser to deliver approximately 1500 discrete retinal burns, avoiding the fovea and disk (IA<I). By reducing the amount of retina to be perfused by 35%, PRP somehow lessens the stimulus to release angiogenic factors, and proliferative retinopathy regresses. B, Disappearance of hemorrhages and nearly complete regression of proliferative retinopathy were attained with PRP, as shown in this fundus, photographed 6 weeks after the one shown in panel A. Vision stabilized, and sight has been retained through the past 6 years of observation. If applied before retinal traction and detachment supervene, PRP is effective in preserving sight in more than 90% of diabetic patients undergoing dialytic therapy or kidney transplantation.

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Prompt treatment

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