A shooter aims his equipment, such as a gun or bow, in the normal fashion with the optical axis of the aiming eye aligned with the gun's front and rear sights towards a target. A thin optical filter manufactured with alternating transparent and solid spaces is applied to the shooter's protective glasses on the lens of the non-aiming eye. The shooter proceeds to aim with both eyes open having only the non-aiming eye's vision filtered. The aiming eye's perceived dominance is increased by reducing the visual signal sent to the brain from the non-aiming eye.