Hi Elaine
It is important to consider if one’s vision has stabilized after the original LASIK surgery before undergoing LASIK enhancement. There is NO definite duration of time, but in general at least 3 months after LASIK, would be the approximate period.
Nevertheless, the duration after the initial LASIK surgery, is not the most important factor to consider. If there are still changes seen in the spectacles prescription after 3 months, it will not be advisable to undergo LASIK enhancement despite the time duration.
If you are keen for a LASIK enhancement, you will need to consult your doctor and be assessed for necessity and suitability for an enhancement. More importantly, it is to ensure that your spectacles prescription has stabilized despite the duration after the original LASIK surgery.
Do discuss these with your doctor, as your doctor will be the best person to determine the timing for the enhancement