If your phoria free, you can also be experiencing what is known as parallaxing.
Your eyes were designed a few inches apart so that they actually see slightly different perspectives, which after your brain processes the signal, give you stereoscopic vision. When you switch from using both eyes to just one, you get a different sight picture (which can be magnified by using a 4x scope).
Put your left hand up close to your face so your thumb is pointing your nose. Open your right then left eye alternately and you'll see opposite sides of your hands. Open both eyes and you'll see a blended image of both sides of your hand.
I would trust the scope up close. But I don't think, like new-arguy said, that if something is a close to you as your doorknob it's going to make a difference.