I think I am the victim of the LASEK enhancement !
You must read my forum on 10 Jul 2008 (LASEK resulting in Convergence Insufficiency & Fusion Problems).
The decision is entirely up to you. Small corrections like yours are the reason for most enhancements. It would be good to have at least one eye very crisp for distance. If your doctor recommends it, then you have done well so far, you should feel fairly comfortable with him to do a small enhancement. There are no guarantees though so discuss it with your surgeon and come up with an educated decision.
MJK MD