Should I use Preservative or No Preservative tears after LASIK?

Not all artificial tears are created equal.  The preservative is only one component of the artificial tears.  While using preservatives too often may be damaging to the ocular surface, some of the modern preservatives are relatively mild.  Ultimately, your doctor should have a recommendation of which artificial tears would be best for you.  They can titrate their recommendation based on their findings of your ocular surface.

you should use preservative free tears every hour for a month after any type of refractive surgery as this helps the healing and visual recoverypreop and months postop you can get away with preserved tears as they are cheaper and you won't be using them so often