If you already have good eyesight but you get lasik eye surgery, might your sight become even better?

No. Lasik corrects a "error" in your visual system such as near or farsightedness---if you have none of these, then there really is no reason for surgeon since there is nothing to improve.
Not usually. Lasik is not done to give you super-normal vision; it is done to correct an error in your prescription. If you are fortunate enough to have naturally clear eyesight, enjoy it! and leave well enough alone.

Related Questions

How old should I be to get lasik eye surgery done?

18 yrs of age. Usually lasik is performed on individuals 18 yrs or older with a stable refraction for at least 1 yr. If your vision is still changing, then you are not a good candidate for lasik and should wait until your prescription has stablized and remained so for at least 1 yr. Read more...
I recommend 21. Because by that age most everyone's eyes have stopped growing and changing. Some will do as early as 18 but more likely to see a change and need it done again. Read more...

What age should you be to get lasik eye surgery performed?

At least 18. There is no set minimum age. It is most important that your prescription be stable before you can have surgery. That means at least 12 months where your eye glass prescription has not changed. Most patients are over 21 unless there are vocational or other concerns that would permit surgery at a younger age. Read more...
At least 18. But there are many factors that you must meet to qualify for LASIK. One of the factors is a stable prescription for at least 1 year. . Read more...

My eye power is bc 8.5/sph -6.00 cyl -1.75/ax 180. Can I get lasik eye surgery?

Most likely yes. With current laser technology, a prescription of sph -6.00 cyl -1.75/ax 180 is able to be corrected very well. To determine if you are a candidate for LASIK, a thorough eye exam that includes measuring the cornea thickness would be needed. Read more...