So I think I just realized my left eye is dominant even though I'm right handed.
Since I'm right handed I always assumed I would be right eye dominant, so I've always put my right eye to the viewfinder and closed my left eye. However, I found it curious that after a short while I would begin to experience severe muscle fatigue in my face as well as eyestrain, and eventually I wouldn't even be able to keep my left eye closed. At that point I'd have to stop shooting because it's totally impossible for me to use the viewfinder with both eyes open.
That is until today, when for whatever reason I decided to put the finder up to my left eye and... REVELATION!
When I put the finder up to my left eye, I can keep both eyes open & my brain automagically filters out what my right eye is seeing leaving only the vision in the viewfinder!
WHY DIDN'T I FIGURE THIS OUT SOONER?


