have been checking eye dominece for about 15years and it has changed almost every time I test it. I have used several ways of testing but I also have consulted a optomitrest "however you spell that" about it and he said it is some what rare but I am not the first person he has seen like this where eye dominece changes and I may be like this all my life but this will normally quite and one eye will become dominent around age 40.