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Journal Article
Review
Principles of treatment of choroidal neovascularization with photodynamic therapy in age-related macular degeneration.
Seminars in Ophthalmology 1999 March
Age-related macular degeneration (AMD) is a common cause of legal blindness in the developed countries in people older than 50 years of age. AMD complicated by choroidal neovascular membranes (CNV) accounts for 12% of AMD, but for 88% of legal blindness cases. Because of the progressive aging of the population, it is expected that AMD will be one of the greater public health problems in ophthalmology in the first half of the next century. Laser photocoagulation remains the only proven treatment for CNV in AMD, but unfortunately, is applicable only to a minority of patients presenting with CNV in AMD. Photodynamic therapy (PDT) is a new experiment treatment for CNV that combines the application of low-intensity light with a photosensitizing agent in the presence of oxygen to produce tissue effects. It uses the noninvasive potential of the laser light to cause a nonthermal localized chemotoxic reaction and obtain highly selective occlusion of the neovascular channels, with sparing of the overlying photoreceptors. Animal studies showed that PDT accounts for the effective closure of experimentally induced CNV. Phase I-II clinical studies showed that PDT using BPD can safely stabilize leakage from CNV in a majority of patients for up to 3 months. Phase III clinical studies to assess the long term prognosis of PDT-treatment of CNV in AMD are ongoing.
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