LASIK surgery is a refractive state correction done on the surface of the cornea. A laser is used to cut open the surface layer of the eye, and then parts of the cornea are removed to change it's shape. LASIK does NOT reduce your risks of eye diseases associated with myopia, you still have long eyeballs and the associated issues with fluid pressure in your eye. LASIK does increase your risk of getting cataracts, which requires lens replacement surgery, which has its own elevated risk factors.
Although most people getting the surgery are happy with it, there are some serious long term complications. Talk to your optometrist if you have complications from LASIK such as dry eye, or floaters. In rare cases, LASIK complications have led to severe depression and suicide.
I already had LASIK
LASIK does not stop myopia progression. If you have had LASIK surgery you can use EM methods to stop progression or try to reverse your progression back to your post-surgical state.