I have tried to use both eyes and I just can't. I get double vision when try. I talked to my trainer about this and her advice was to use one eye if o have to and not worry about it. If you are hunting, it is nice to have that extra field of vision and light, but some of us are just not wired that way. There are some people who are right handed and left eye dominant. There is no way to change that either. You just adjust to what ou do best.
I don't expect everything handed to me. Just set it down anywhere.