or put your hands together at arms length so there is a space in the middle of them you can put on an object. Now close first your right eye and then your left....whichever eye is open and still on the target is the dominant eye. Once you are shooting with your dominant eye, you can shoot with both eyes open or one closed....in hunting situations i like one eye open because you can see what the animals doing easier, as well as how it reacts to the shot.