Non square posterior edge IOL have an higher incidence of PC opacity and the need for a yag. Multifocal and accommodative IOLs need a yag with much less PC opacity compare to a stand square edge IOL. The need for a yag decrease with time. However, some patient need yags year after surgery.
Dr. O.
Mutlifocal and accomodating lenses (e.g., ReSTOR, Crystalens) have a greater probability of needing a YAG.
If you haven't needed a YAG for two years, I doubt you will need one in the future.