Can you guarantee 20/20 vision?

It is not possible to guarantee a perfect result of any surgery, including laser eye surgery. There are variables from person to person that are unpredictable and may result in a less-than-perfect result. If your vision after surgery is very close to 20/20, it is typically advised to leave it as is. Additional surgery can usually be done for those whose vision is blurred to the point that it is bothersome.