Over at North Carolina Sportsman there is a really nice article on this subject
“The answer,” he continued, “is just like your editor’s solution — force the mind to utilize the non-dominant eye.”
Several different tricks can be used here. You can patch the dominant eye as Masson did with his son. Coates said the method most preferred here is to place a piece of opaque tape over the glasses on the side of the dominant eye. This forces the non-dominant eye to take over and aim without totally blocking vision in the dominant eye.
