Salas was 14 when he lost his vision. His eyesight had always been subpar - he was wearing glasses by the time he was 5 - but it wasn't until his freshman year of high school that his vision began deteriorating rapidly. It happened without warning. Glasses no longer helped. Colors bled into a fuzzy gray. Even the moon was blurry. Tests revealed his optic nerves were dying, though the cause remained a mystery.