Being a girl it's difficult to join IAF but it gets worse when you have myopia.So my dought is if we carry out LASIK surgery.caN I join IAF

There have been instances where people have undergone Lasik and have managed to get into IAF, provided myopia get cured completely. However, let me tell you that there are lot of career opportunities open out there don't restrict yourself to just one option especially when it is getting hindered due to medical issues. I know you must be having your own reasons and aspirations which must be quite strong, to motivate you to take this step. But life is long and there are so many other opportunities as an engineer that you can grab, you can do master's and enter academia, you look for jobs in government and private sectors as well.

Lastly, if you are very keen on joining IAF just make sure that there are no negative implications of Lasik in the long run before you undergo the same.