Depends really on how dominant your dominant side is and how flexable you are.Also what job you do has a bareing on the bodys ability in sport as regards movement. One little test you can carry out yourself, eyes open line your finger with your nose and an object about 10 ft away, thenclose one eye see where the finger is then open and close the other. the one that stays is your dominant eye the one that moves is your less dominant and more short sighted as a rule . If niether move your the 1 in 23,000.000, you can please yourself. With that information you can or should see the reason for advocating the theory and why eyesight slows you down. Both eyes dont see the same thing, and what you see is in the past