It is not at all uncommon to switch dominance as we age Tyler, and the improved acuity in the left eye now may be contributing to the timing.
The extremely short version of dominance and dominance shifting is that the dominant eye is not necessarily the eye with the best visual acuity, but the one with the "best" visual processing
. This is very likely the issue with women who are much more likely to need some form of off-eye occlusive but who on formal testing are actually not much more cross-dominant than men.
Visual evoked potentials have shown that dominance is related to the difference in latency (speed of the impulse to the visual cortex) and amplitude (amount of impulse). http://iosrjournals.org/iosr-jdms/papers/Vol2-issue4/D0241924.pdf
The problem is that "dominance" doesn't really capture all that is going on with binocular vision: there are LOTS of visual processing issues - binocular rivalry, rivalry dominance, stereopsis, motion perception threshold, and lots more I don't understand https://www.trapshooters.com/threads/finding-the-master-eye.852691/
I asked a friend who teaches neuro-ophthalmology down the street at Midwestern U. why we switch dominance and he gave me that "you won't understand" look and said "we just do."
Likely more than you want to read
Dominance Switching Poll with review of the sciencehttps://www.trapshooters.com/threads/dominance-switching-shifting-poll.778281/
"The Peculiarities of Vision" https://www.trapshooters.com/threads/the-peculiarities-of-vision.793021/
This is one of the better posts regarding the science of seeing targetshttp://www.trapshooters.com/threads/brain-will-use-the-clearer-eye.732609/page-3http://www.trapshooters.com/threads/brain-will-use-the-clearer-eye.732609/page-4
And a thread with some interesting links that some here might enjoy readinghttp://www.trapshooters.com/threads/shooting-and-golf-sports-vision.738209/
Poll: Corrective measures that have resolved my dominance issueshttps://www.trapshooters.com/thread...ave-resolved-my-dominance-issues.778369/