Tom220 Eye muscles and lasik should be unrelated in any direct way. However, and that is just my layman opinion, if lasik fixes sharpness of vision, maybe then different accomodation is needed than before (lens gets cut), so maybe the very thin balance between vergence and accomodation could be negatively affected. However I believe that those eye muscle problems must have been present before too, maybe just not as pronounced.
Heterophoria however is a bad match of accomodation and vergence combined.