There are more than three thousand, more than five thousand, more than seven thousand, three kinds. Let me explain here that not everyone is suitable for these three kinds. Be sure to go to the hospital for a detailed examination of your eyes before doing it, including vision, corneal thickness, astigmatism, lacrimal passage and so on. And then make sure, because some people can only do 5 thousand or 7 thousand. However, most people can do these three things. The three differences are that the machines used are different. Above 5000 can be adjusted automatically. When you join the operation, your eyes rotate and move, and it can automatically adjust the cutting angle to make up for the error. I don't know more than 7000, because I used more than 5000 when I made it.