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Art Garfunkel and Sanford Greenberg discuss their special bond

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After Sanford Greenberg lost his vision due to a misdiagnosis with glaucoma, his friend and college roommate Art Garfunkel became the light in his life that helped him see. The two men join TODAY’s Al Roker to talk about their special bond that inspired Greenberg’s newest book, “Hello Darkness, My Old Friend.”