From what physical handicap does Silas suffer in Silas Marner?

I don't know that I would necessarily call it a
"handicap," but the problem that Silas has is that he is sort of "hunched over," if that
makes sense.  He was a weaver by profession and therefore spent a lot of time crouched
over his loom, which left him with a crooked back.  He also has kind of intense, creepy
eyes, and looks older than he really is (though these aren't really "handicaps" in the
true sense of the word.)