As we get older and more locked into our habits, however, it's hard to teach the opposite shoulder new tricks. That's when we overcome cross-dominance by shifting the work load to the non-dominant eye. There are several ways to do this and most of them work pretty well. As it so happens, the non-dominant eye will take over, becoming temporarily dominant if, for some reason, the dominant eye is blocked. Thus the simple fix for wing-shooters is to make it harder, if not impossible, for the true dominant eye to see the target. One of the quickest ways is to put a smear of petroleum jelly on the dominant side lens of your glasses. The dominant eye then sees only a blur and the other eye automatically takes over.