To Learn Which Eye You Should Aim with, What Do You Need?
With just your hands, you can learn which eye is your strongest one, regardless of whether you have glasses or contacts. Once you do learn which eye is your strongest, you’ll want to use it as your aiming eye to center targets and set sights. This is the eye that will give you the most accurate results.
Extend your arms straight in front of you. Create a triangle with your hands by touching the tips of each index finger as well as each thumb. Focus on something within your site, putting it in the center of the triangle you created.
Close each eye, one at a time, and look at the object while your arms are still extended and your hands form a triangle. Note which eye keeps the object closest to the center of the triangle. This eye is your strongest eye.
The brain actually merges the two images you see to create just one. Think of your strongest eye as the lead eye, and the one you should use for aiming your gun, bow, or other device.