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Eye Dominance Test
To test which eye is dominant, simply hold your arm out straight in front of you and line your thumb up with some mark on a distant wall. Then close or cover one of your eyes. If your thumb seems to jump to one side, you have closed the dominant eye. If your thumb still lines up with the mark, you are looking through your dominant eye. For me, this is my left eye.
When I aim a rifle that has open sights, I keep both eyes open. That way the sights are transparent and seem to be superimposed on the target. But I hold the rifle against my left shoulder, with my left hand on the trigger, and it is my left eye that is lining up with the target.