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Photosens is a mixture of sulfonated aluminium phthalocyanines with various degrees of sulfonation .. Developed in Russia .. It is a photosensitiser -LRB- activated by 675 nm red light -RRB- sometimes used in photodynamic therapy trials .. photodynamic therapy. photodynamic therapy. It has been tried on Age-related macular degeneration. Age-related macular degeneration. Age-related macular degeneration