A one-eyed documentary filmmaker is preparing to work with a video camera concealed inside a prosthetic eye, hoping to secretly record people for a project commenting on the global spread of surveillance cameras. Canadian Rob Spence’s eye was damaged in a childhood shooting accident and it was removed three years ago. Now he is in the final stages of developing a camera to turn the handicap into an advantage. A fan of the 1970s televsion series “The Six Million Dollar Man,” Spence said he had an epiphany when looking at his cell phone camera.