Whether you're running at top speed and catching a football, or precisely aiming a golf shot, knowing which eye is dominant will help you in any sport.
An athlete can interpret fast action and achieve better head and eye positioning by knowing which eye is dominant. A dominant eye can process visual information more accurately than the non-dominant eye.
Quick Test for Eye Dominance
Use both hands to form a small triangle between the thumbs and first knuckles of your forefingers. With both eyes open and your arms outstretched, move your "triangle" until you have a distant object such as a light switch within the center. Shut your left eye. If the object stays centered, you are right-eye dominant. If the object moves out-of-center, you are left-eye dominant. Interestingly, eye-dominance is not related to if you are right-handed or left-handed.