I didn’t notice this until Tuulikki brought it up more than two years ago (click on the pic for Flickr comments), but I use my left eye exclusively at the viewfinder. And, come to think of it, it is the first eye that opens in the morning. The first thing I do to wake up is to read info on my iPod Touch (after the cats walk over me and poke me to feed them), and I still only use my left eye! My right eye is shut tight, and this is involuntarily. I thought about it this morning when I noticed that I unconsciously kept my right eye closed until I went to exit my bed.
I wonder if it’s because my brain knows that my right eye has poorer vision than left, so it sends a motor signal to leave it at rest for as long as possible? Is one part of my brain so dominant over the other that it can’t manage both eyes until the whole noggin wakes up? I have no idea.
Anyway, I’m curious to know whether my particular eye/hand coordination is common. I use my left eye, but I’m mostly right-handed with some ambidexterity. From observing other people, this is a rarer combination than I thought, but maybe it’s a perception.