I did a bit of research on LASIK. Permanence of the proceduer depends on the individual. You don't suddenly become nearsighted and need glasses - it happens over time. Your eyes are constantly changing. If your eyes change rapidly, it could be that the procedure doesn't last a long time. If they change more slowly, you may not notice changes in your vision fo 20 years.
It also does not claim to stop the aging process of the eyes. For example, there will come a time when you will need reading glasses because aging changes the ability to focus your eyes on closer items.
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