It is well known fact in the shooting world that everybody has a master eye, and it may not be the samee one as your dominant hand. While some shooters close an eye to account for eye dominance issues, others use a blanking dot or even an eye patch.
However a patch is not ideal as it restricts the vision to the left or right. James Keyser Products have introduced a magnetic gun mounted eye blanker that can be fitted to either side of most shotguns. For extra security they come with a wide elastic band for walking through undergrowth and woodland.
Because the Cyclops is attached magnetically it can be removed quickly by hand after a drive or stand and placed back in the pocket, allowing the gun to slide into the slip unhindered. The magnet is protected by plastic so ideal for Shooting Schools and Grounds because they are easily attached, Cyclops could provide the answer to help straighten your shot.