I am new to rifles (looking to buy my first) and scopes, but have handgun experience. I know I am left eye dominant, and right handed. The other day, I was in an outdoor store, and was checking out some scopes. When I held the rifle and scope up to my right eye, with both eyes open, I couldn't see through the scope. I switched sides (to the scope on the left eye) and the same thing happend - couldn't see through the scope. But, if I just had the scope eye open, I could see through it. I think I read that you are supposed to keep both eyes open when you use a scope. What am I doing wrong? Why can't I see through the scope with both eyes open, even though I tried with my dominant eye?