With most people, one of their eyes is usually superior to the other. Two-thirds of the population prefers the right side. The brain automatically selects your best one to dominate your visual field and relies on it for precise positional information. If your dominant eye is on the same side that you shoot from, great. You should be able to shoot with both of them open with absoloute comfort, which is greatly preferred. However, if dominance is on the wrong side from your shooting shoulder, you must shoot with it closed or switch shooting shoulders to prevent cross-firing. Here's a couple ways to determine which is dominant.

1. Choose two vertical objects, one a few feet behind the other.
2. Stand about 10 to 15 feet away from the closest object.
3. Look carefully at the alignment of the objects.
4. Without moving, cover one eye and look at the objects with the other one.
5. Switch eyes, looking through the eye you had previously covered, and closing the other one.
6. Look at the objects with both eyes again.
7. You should now be able to identify which eye observed little or no real change, and which noticed a shift in the the objects. Repeat the previous steps if needed.
8. The eye which observed the same view as with both eyes open is your dominant one!

The dominant eye is often on the same side as the dominant hand. You will usually unconsciously choose this dominant eye when peering through a telescope or camera viewfinder.

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