wasn't enough for john sutton.his son's long delayed trial he pursued with something like an obsession, a quest to regain his eyesight. and most people might have given up by then. can't do anything. live with it. >> not even close. i won't take no for an answer. >> reporter: some of the best hospitals in the country, sutton had been told there was simply nothing to be done. he would be blind for life. the bullets had permanently destroyed his optic nerve. john had heard about a landmark break through at harvard affiliated research institute in boston where a renowned researcher had regenerated the optic nerve in mice using stem cell therapy and drugs, human trials would be next. so in march 2008, almost three years to the day after his son was arrested, sutton and his girlfriend kathy were on the cold, rain swept streets of boston on the way to an appointment at the clinic. >> okay. there is a chin rest in front of you. a doctor evaluated, sutton's one intact eye and discovered though the nerve was destroyed, the