incredible! i've been claritin clear for ten days. when your allergy symptoms start, doctors recommend taking one claritin every day of your allergy season for continuous relief. with powerful 24-hour, non-drowsy claritin live claritin clear. every day. finally tonight, when we look out at the majestic views of the grand canyon we assume they will always be there and for one man they won't be. and time is running out. here's steve osunsami with an effort to get ahead of that life-changing deadline. >> reporter: 27-year-old james is going blind. >> unbelievable. >> reporter: he's here at the grand canyon with his girlfriend