if you're less than 30 years old, you MUST be OVERCORRECTED or you will need an ENHANCEMENT
the reason for this is your prescription is NOT STABLE until you're 30
that's because your eyeball is STILL GROWING until 30, but STOPS GROWING at 30
therefore, if you got your LASIK at 25, for example, your surgeon should have used a NOMOGRAM or regression formula to calculate what Rx you would wind up with at age 30, using your OLD PRESCRIPTIONS and progression to date to calculate this
unfortunately, as a surgeon, you cannot create an accurate formula unless you have lasered over 1000 cases, or MORE than 100 cases a year
so, if you went to a surgeon who "sometimes does LASIK" but "mostly does cataract surgery" he probably didn't have enough experience or confidence to over-laser you sufficiently to account for your myopic regression, which now is requiring you to need an enhancement
that's why i advise people to only go to a surgeon who SPECIALIZES in REFRACTIVE SURGERY, does not perform other types of surgery, completed a 1-2 year REFRACTIVE FELLOWSHIP after residency, and performs 1,000 cases a YEAR, as then he has the requisite experience and confidence to treat you appropriately
you can go back to your original surgeon if he has some type of guarantee or discount for enhancements, but i doubt he does after so many years. if he doesn't, then you should go to somebody more experienced, the chance of needing an enhancement for your moderate level or myopia going in is almost 0
hopes this helps, and please don't go back to him and say i said that he was a bad surgeon--i'm just saying that people should have LASEK by MDs who actually specialize in that (just as i stopped performing cataract surgery 10 years ago, and so sent my own parents to someone in NYC who only does that, so is a super-expert in that subspecialty)