I went to the ophthalmologist with an eye problem and he recommended glasses. I have been wearing them for about three weeks now and have noticed changes in my normal vision ( without the glasses). My normal vision has become blurry and i have problems seeing things some distance away . This was never a problem before. In fact i have never had a problem with my eyes except for that one occasion where i went to the ophthalmologist. Furthermore, i have been experiencing headaches when i wear the glasses. There is also this bit of tension at the back of my head on both sides. Is any of this normal?? Should i continue wearing the glasses or go back for another checkup?