1. Make a triangle with both of your hands by overlapping your thumbs and the top half of your fingers.
2 Put your arms out in front of you and pick a target in the distance to look at
3 Look through the triangle made by your hands and look at the target.
4 Keep your hand-triangle small enough so that only one eye will be able to look through it when your hand has reached your face.
5 Keep both eyes open throughout this procedure.
6 Move your hands back to your face, still looking at the target through your hands. Make note as to which eye you find your hands gravitating towards.
7 Just to make sure you can repeat the process, holding the triangle at
arms distance again and closing your non-dominant eye. The target should
remain centered in the opening.
The result will be your dominant eye which means that this is the eye that
you will be aiming with when shooting your bow.