This seemingly simple question actually has many possible answers. All of which depend on each individual's case. The ability to have a second LASIK treatment (also known as an enhancement) is dependent upon several factors. Each time we perform LASIK, we remove a small amount of corneal tissue, so we have make sure you have enough corneal tissue left to safely perform the procedure again. The second factor is the status of the flap. After several years, it becomes more difficult to lift the first flap, and this carries greater risk of complications. If it is not possible, other procedures are available, and so your surgeon will need to discuss this with you. Finally, we have to assess the overall status of the eye and make sure that your vision is diminished because your refractive error is changing, and not another issue. For example, it would make little sense to repeat LASIK if in fact you are developing a cataract, which requires a completely different approach to improve your vision. However, if these factors are within suitable ranges, an enhancement can be a safe procedure.