The parallax eliminator is designed to improve the aiming ability of the average shooter and help decrease the time interval between pointing and aiming of a firearm at a target.
Parallax: The apparent displacement of an observed object due to the difference between two points of view.
The parallax eliminator-eliminates the double image of a fire arm or any other object being held up in front of a shooter's face when the shooter is trying to focus on another object in the distance such as a target while keeping both eyes opened.
The parallax eliminator accomplishes the elimination of the double image of an object (such as a firearm) being held in front of a shooters face without the shooter having to close one eye (usually the none dominate one) while aiming at a target with both eyes open. The shooter is allowed to keep both eyes open and focus on the target while aiming the firearm when using the parallax eliminator.
The parallax eliminator is not like a patch; a patch will cover the entire eye of the wearer and cut off the vision in that covered eye completely. The parallax eliminator allows the wearer to see both to the front and to the side when applied.