When you're using the arrow point to aim the shot, you either need to focus on the arrow point or on your target. Most hunters focus on the target, so the arrow point is a blur in their peripheral vision. This is the way Howard Hill aimed his bow. There is also a style of aiming where you focus on the arrow point, and the target is a blur. This is how they taught me to shoot my rifle in the Marine Corps (well, we didn't have arrow points, but we did have a front sight).
But whichever one you choose, if you accidently shift your focus, you will miss the shot. It is an easy thing to do as you draw your bow and the arrow comes up into your vision to shift your focus to the arrow, or maybe some intermediate point between the target and the arrow. If your method of aiming is to focus on the target, and you lose that focus for any reason, you will miss the shot.