Each shooter has his own shooting style and form; there are not many shooters with the same form. One shooter preference is whether to shoot with two eyes open or just one. The theory behind shooting with two eyes open is that you will be able to see the bird come out of the house sooner.
The problem with shooting with two eyes open is that if you are not shooting with your dominant eye you will see double. You will see two barrels and two birds, this obviously does not work. Most people that have this problem are not willing to switch to switch eyes.
One way to fix this is to put a piece of tape in front of your dominant eye, this will allow you to pick the bird up but will stop the double vision. This technique is used by many people and does allow you to shoot better but I think that if you shoot using your dominant eye you will shoot even better.
Since I have been shooting I have encountered many shooters that have tried to shoot with two eyes open and had problems because they see two barrels. This obviously discourages them and they go back to shooting with one eye. I have also encountered shooters that have tried to switch their eye dominance but it is very hard to do.
There are multiple ways to determine eye dominance. One way is to take your hands and put them together so that the space between your thumb and trigger finger makes a triangle. You then hold your hands fully extended in front of your face. Then you pick an object that is away from you and put it in the middle of the triangle. You then slowly begin to bring your hands closer and closer to your face, keeping the object in the middle of the triangle. If you do it correctly your hands will go to one of your eyes and that will be your dominate eye.
The ability to shoot with two eyes open is a very useful tool, personally I have shot with two eyes open for the majority of my shooting career. I believe that it is the only way to shoot and seems more relaxed for me because you don’t have to keep your other eye closed. So if anyone has advice for shooters trying to shoot with two eyes open, please comment and share the knowledge.