You want to join NDA, but weaker eyesight will cause a problem for you in Air Force but not for other.

However, let me tell you girls cannot give NDA exams.

NDA is a premier institute for the Triservices for boys.

As you are interested in Indian Defence, you can give exams like CDS, AFCAT and other entries aftere completing graduation.

You can also join Officers Training Academy in Chennai.

But before you apply to any such exam, you should have a perfect physical health as it helps you to get a perfect selection to such services.