Don't do this. Try not to do it. To be honest, I didn't do it well once. My eyesight is getting worse and worse now. Playing computer has a great influence on eyes. Careless protection is the same as not doing it. Surgery can't solve anything. I regret it. I would rather wear glasses than have an operation. I have had five or six operations on my eyes. I'm not ready. I feel like I'm dying. I won't do it now.