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And a little germ of hope lodged itself in his stubborn mind. >> and you were thinking -- >> i said, i am in the right spot. >> he talked to believing researchers working on optic nerve repair. >> have you donnie studies with severed optic nerves? >> he peppered them with questions like he was cross examining witnesses. mike gilmore, then the president of the hospital, offered sutton a glimmer at least of hope. >> we will be able to regenerate an optic nerve. it's not a question of can we, when can we. >> and it was a good news/bad news sort of day. >> i do not want to mislead you or provide f...

>> my son is in jail, charged with first degree murder. >> reporter: they listened to the awful story of the way john lost his eyesight. they explained to him the amazing things they were doing here like growing corneas in a petri dish and working on optic nerve regeneration. john took it all in, amazed. and for the first time, since the shooting, he felt a surge of positive excitement. and a little germ of hope lodged itself in his stubborn mind. >> reporter: you were thinking, maybe they can do it for you. >> i said i am in the right spot. >> reporter: he talked to the leading researcher wor...

>> my son is in jail, charged with first degree murder. >> reporter: they listened to the awful story of the way john lost his eyesight. they explained to him the amazing things they were doing here like growing corneas in a petri dish and working on optic nerve regeneration. john took it all in, amazed. and for the first time, since the shooting, he felt a surge of positive excitement. and a little germ of hope lodged itself in his stubborn mind. >> reporter: you were thinking, maybe they can do it for you. >> i said i am in the right spot. >> reporter: he talked to the leading researcher wor...

Germ of hope lodged itself in his stubborn mind. and you were thinking maybe they can do it for you? >> i said i'm in the right spot. >> he talked to the leading researchers working on optic nerve repair. >> have you done any studies with severed optic nerves? >> he peppered them with questions, like he was cross-examining witnesses. >> mike gilmore, then the president, offered sutton a glimmer at least of hope. >> we will be able to regenerate an optic nerve. it's not such a question of can we but when can we? and it was a good news-bad news sort of day. >> i do not want to mislead you or pro...

Period of time presents a lot of challenges. >> that simulation makes sense and also makes sense to talk to somebody who has been there, and you have. you've logged 54 days in space during four missions. how does space travel affect you physically and mentally? >> well, the physical effects are pretty significant. i mean, you lose blood volume, your immune system gets depressed. you start to lose bone mass after spending some time in space. we have astronauts that have had issues with their optic nerves. then there's the radiation environment. so it has significant physiological effects, and w...