First, make a circle with your thumb and index finger.
Next, look at the wall which is not blank or something in distance.
Then, put the circle in the center of your visual field and see with both eyes, Remember what you see in the circle.
After that, close one eye and see. Find out if the things you see move in comparison of both eyes open. Change into the other eye.
Finally,compare what you see with both eyes open and single eyes.The eye which you find things move more is the dominant one.
HAHA,such a funny question. How about making an okay sign with your hand? And then you can close your eyes for a little while. After that you can just open your eyes and look through the hole, and you will get to know which eye is dominant, lol. Very easy, huh?
Actually, here's a neat trick to determine your dominant eye. You can extend both hands forward of your body and place the hands together making a small triangle (approximately 1/2 to 3/4 inch per side) between your thumbs and the first knuckle like this. With both eyes open, look through the triangle and center something such as a doorknob in the triangle.Close your left eye. If the object remains in view, you are right eye dominant. If closing your right eye keeps the object in view, you are left eye dominant.