together to get a picture of where i am. gives me more vivid picture. reporter: at mount mitchell state park, trevor thomas of charlotte continues a 962 mile journey along the mountain to sea state trail. starts in the dome in the smokies, goes through most of the major parks. no map could have guided him through what he has been through. he and his dog teni itnille hav conquered every challenge. reporter: eight years ago, he lost his eyesight within eight months. in layman s terms, if your eye is a camera, macula is the film. eight years ago my auto immune system, decided it was a foreign body. reporter: he s barely able to tell daylight from dark, but hiking helped him find his way in life again. so it is very invigorating for me. very freeing. it makes me actually feel equal.