Yes you will need to have a second surgury, and a third, etc... until you change your lifestyle. Meaning you have to stop making your eyes adapt to close up situations all day. If you get the surgery and you contine to sit in front if the computer all day, or read documents at work, school constantly without taking a break, your eyes will become accustomed to it again and they wil become even more elongated.
That's the only reason why you are nearsighted, is because you eyes have elongated to adapt to your visual situations you find yourself in most often. IN that respect it can be reversed with exercises(no not the bates method either). Anyway the shape of the eye is controled by muscles and like any other muscle in the body you can work them to reshape your eye to it's original form. I went from a -4.00 in both eyes to a now -.25 in about 6 months, 20 minutes a day. Of course I wasn't always faithfull to the program so I could have gotten better results faster.