D.A.
I had a lazy eye as a kid. The doctor had my mom do eye exercises with me each day. For example, hold two pencils directly in front of the eyes, at different distances, and have the child focus from one to the other. Then hold the pencils on opposite sides of the face and do the same. Granted, this was a long time ago. :) This may also be difficult with a two year old.
Good luck!