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Hello and thanks for your question. It sounds as though you are referring to LASIK or PRK or some kind of corneal refractive surgery, correct?
If so, yes it can unfortunately regress again. There can be many reasons why someone's refractive error can shift and change or regress after having an initial surgery. Suffice it to say, though, it is not uncommon for some shifting to occur. Hopefully, if it happens it all, it happens several years down the road. With you, though, if the shift has been large and significant in just one year or less, then there is a distinct possibility that it shifts and/or regresses again. The problem in multiple operations, though, is that there is only a finite amount of corneal tissue to ablate (remove) with the laser. If your cornea becomes too thin it can become unstable and make vision worse and put you at risk for future corneal problems. However, a refractive surgeon worth his/her salt should absolutely know at what thickness this is and should not come near it with plans to do further surgery.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.