There are different ways to test the eye dominance. The main one, or at least the one we used the most at the range is the (modified) Miles test.
For the (modified) Miles test, you put two hands together and create a small opening between them. Then with both eyes open, you look through that whole at an object far away. Then, still keeping both eyes open, while looking at the object, bring the hands towards your face. The hole between the hands will end in front of the dominant eye.
When I am teaching, I then ask my students to repeat the exercise, but this time they have to try to look through the other eye (non-dominant eye). You either have to move your head, or your hands still end in front of the non dominant eye.
If you are trying to check somebody for eye dominance, and you are not sure that they are being completely truthful, (see my previous post on eye dominance), there is a simple trick you can do with the modified Miles test. Just ask them to perform the technique while looking at your nose. You will see their dominant eye through the hole between their hands.
Some people like to use the Porta test. You know, the one where you extend your arm and cover a far away object with your thumb or index and then you close one eye or the other to see in which direction the object moves… Personally, I don´t like it. People begin to blink like crazy to then declare that they see two fingers and can´t decide which one to follow…
There is another technique, recommended to me by David Chan. He is a USA Archery Certified Regional Coach at Golden Gate Joad in San Francisco. He uses the cardboard tubes from kitchen towels. He gives them to their students, and ask them to look through them. In most cases the tube goes to the dominant eye. Give it a try, it works 😀
Another simple technique is asking your students to point to your nose with their index fingers. The funny thing is that their dominant hand will come up pointing, and the dominant eye will in the line formed between the index finger pointing and your nose.
If you have any other ideas or other methods for finding the dominant eye, let me know.
In the meantime, have fun and stay safe.