Another thing I would watch out for is that often poeple with legal blindness are in hte habbit of getting very close to print material so they can focus on even the enlarged print. THis, of course, will stop them from playing fluently later on. If this happens, I would recommend studying small sections of notes at a time and memorising them in short phrases, then going back to the piano to play the phrase by memory - rahter than developing a habit of leaning into the music when at the piano.
Did you all see on the news last week that blind student who was in a college marching band, in a wheel chair? He plays the piano also, quite well. I saw it on ABC, World News. I wish I could remember his name. It was quite an impressive story.