David Blaine has been warned his latest stunt could cause him massive internal damage and leave him blind.Starting on 22 September, Blaine will hang upside down for 60 hours over New York's Central Park - with no safety net.Even if he doesn't fall, a leading heart specialist claims the rush of blood to his head could leave him seriously injured.Speaking at a press conference in New York on Thursday, Massimo Napolitano, chief of vascular surgery at Hackensack University Medical Center in New Jersey, said, "All the organs pretty much are effected by this. Most importantly the blood rushes to the head. There is danger of brain hemorrhage. There is danger of the blood rushing to the eyes and blinding David."And Richard Ruden, a doctor who has worked on many of Blaine's stunts, insists the star is the only human who could survive such a stunt: "It is really important for people to understand that David is not an ordinary man. It is David's choice to endure superhuman stress. If he can accomplish this, we might have to change his name to 'He Who Hangs With Bats.'"

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