Hello dear,

If your visions are too bad you can't see without  glasses then unfortunately they won't accept your application.  If your vision are quite good you can see without glasses then you can go for it with contact lenses. To become a cabin crew you don't need to do any course , you can apply directly according to their criteria and prepare yourself for interviews.. but their are some institution they have  cabin crew course if you want to learn or polish yourself for cabin crew then go for it. Otherwise their is no need of courses . Their are some institute in Delhi for cabin crew ,but Delhi university not provides courses for cabin crew.