My brain will get bored and shift dominance. When I was zz-bird shooting a lot my shooting coach noticed it. It caused a number of unexplained misses that he caught while looking over my shoulder while using a wobble trap for practice. The answer was a smudge on the left lens of my glasses which then forced me to be right eye continued dominance.
In the field I don't think it it is much of an issue.

W. E. Boyd