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Far-red PBM therapy significantly reduced diabetes-induced death of cells in the RGC. Rats that had been made experimentally diabetic (D) or remained nondiabetic (N) were exposed to 670-nm light (PBM) each day (4 minutes, 25 mW/cm2, 6 J/cm2), or no treatment. After 10 weeks diabetes, retinal sections were assayed with TUNEL kit to assess death of cells in the RGC layer (n = 5 per experimental group).
