Promoted Local Answer
It is not unusual for treatment of high prescriptions to result in quality of vision issues such as you describe. For this reason ICL surgery is a better option to start as it would create a better visual outcome for distance vision under all sitations. The existing issues would be best addressed at this time with a custom surface laser treatment to attempt to address issues of corneal irregularity after the original LASIK procedure. In our experience such treatments can substantially improve your situation.
*Would 2nd advanced LASIK cause
starbursts at night again?-->If by advanced LASIK you mean wavefront, yes,
it is possible that more LASIK, even wavefront, can cause starbursts
again. It can’t be predicted. If you have large pupils, or are having
a large correction, the chances of night side effects increase.
*Is ICL an option for someone who's
had LASIK done?--> LASIK will not change your candidacy for ICL. Generally speaking, if you were a
candidate for ICL pre-LASIK, you will likely be a candidate for ICL now
(assuming there is “enough” myopia to treat with an ICL... the minimum is 3D).
*Would it improve underwater vision
as well?--> In my experience, underwater vision (with a mask) will improve
commensurate with vision on land following these surgeries. Without a mask, it is unpredictable
what your vision will be like underwater.