At first when I started I closed one eye, but I thought I was looking down the shaft, that was before I even knew of Instinctive Shooting. Then when I read about it I realized that I was really shooting instinctivly. So then I tried both eyes open, really helps me concentrate on my target better! When I close one eye I pick up other stuff such as the riser and the tip of the arrow, and it takes my concentration from the target!