So you freaks that are ambidextrous, do you have a dominate eye.
Actually, you don't have to bring your hands to your face. Form the triangle as you described at arm's length and look at an object with both eyes open. Then close one eye. If the open eye shows the object in the center of the triangle, that's your dominant eye. You won't even see the object if it's the other eye.I was shown how to figure out which eye is dominant by putting your hands together, fingers forming a triangle, then looking through it at something and bringing your hands in toward your face without losing the target. Theoretically, the hands would move toward your dominant eye. I could never do it without losing the target with my hands about 6" away. If I close one eye, pick the target, then open the eye, the trick works.
Actually, you don't have to bring your hands to your face. Form the triangle as you described at arm's length and look at an object with both eyes open. Then close one eye. If the open eye shows the object in the center of the triangle, that's your dominant eye. You won't even see the object if it's the other eye.