People who have high myopia had better not take the lasik surgery to correct their eyesight. This is because that highly nearsighted people have to be cut more cornea organisation to achieve the purpose of correction due to the high myopia. However, the thickness of the cornea is very limited, thus the cornea can only be partly cut, which means that the vsion can only be partly corrected accordingly, making the vision still possesses a certain degree of prescription. This is to say, the effects of lasik surgery are not very effective for the people with high myopia. In addition, the risk of the lasik surgery for highly-nearsighted people is relatively high. The basic requirements for people who want to take a lasik surgery are as follows: 18-55 years old; 100-1200 degrees of myopia; 600 degrees of hyperopia or astigmatism. And how long this can last depends on the surgery technology, your personal health condition and the eye care after surgery. As long as you develop good habits when using your eyes and confirm to the doctor's order, the effects of the surgery will last long.