Maxfit, I see two arrows also when I try to sight down the arrow. If I look down the arrow and concentrate on the target, it's okay. I don't see two arrows. If I focus on the arrow instead of the target, I see two arrows. I lost my 3-D vision when I was about 21 years old. I wear glasses that seem to correct my vision enough to see in 3-D, but I get dizzy after a while... So, for shooting, I concentrate on the target and not the arrow. If the arrow hits left consistently, I know my eye is not over the arrow. I try to keep my right eye almost over the arrow and not look at the arrow but just look at the target and let the arrow just point. It's rough trying to shoot the gap method when you have two arrows to line up, one pointing one way, the other another way. I usually line up the "arrow" on the left. Nothing wrong with closing one eye though when your depth perception is not so good anyway. Hope this clears you up some!