Which eye do you put to the viewfinder?

I'm curious because I am right-handed and have always (unthinkingly)
put the viewfinder to my right eye. However, a recent eye examination
has discovered that I have cataracts and my right eye is significantly
worse. With a new prescription they say they can get me to 20/25 and
I'll need cataract surgery eventually, but I'm wondering if, in the
meantime, I can successfully train myself to use my left eye to the
viewfinder.

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