Well, it is normal to have some uncomfortable feelings when you wear the glasses in the first time. For example, you are not accustomed to the glasses, and then it makes your eyes have eye strain. And when you have some eye strain, it will lead to some long term effects, if the situation is serious. For example, it can put stress on the eye muscles and the facial and scalp muscles, causing pain and headache. And what is worse, it can lead to making your vision become worse. Of course, if it is a long time, eye strains can make your eyes become dry. For your situation, you can just do some eye exercises to strengthen these muscles. And also you can drop some eye drops on your eyes. Anyway, just be careful about it.