Living without sight

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Dale Layne, a student who says he is totally blind, feels his way down a hallway while heading to the gym at the World Services for the Blind in Little Rock, Arkansas, January 3, 2013. Due to his blindness, Layne says he sometimes suffers from Non-24-hour sleep-wake disorder, which makes him indifferent to a day-night light cycle. REUTERS/Gaia Squarci