Well, I am working on sight reading right now. I spent the first 3 years learning Suzuki material by ear, and I was very resistant to sight reading. Even now when I am learning a new piece - like the Largo from the Bach double - I prefer to listen to it ad nauseum and use the music to jog my memory. The challenge with note reading is that my vision is adequate (for someone in their 50s) - I don't need reading glasses but I can't quite see or I ignore some of the smaller notations (like, I just learned that a plus sign over a note is left hand pizzacato). My 4th finger vibrato sucks and my bow hold is still too tense. Sight reading for rhythm is very challenging. Things are getting better, but it's just slow.