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I'm very right eye dominant. When I was younger and had excellent eyesight I never though about changing eye. Recently I've tried to use the left eye at the scope, to determine which is sharper, but with limited success. I found the left eye to be too much trouble and just went back to what is easy.
One thing I just can't do at all is use a finder or telrad with my left eye. I've tried but my method is just too ingrained. When I started out I had a straight through finder. To get to the right area I would have both eyes open. That way I saw a zero power view of the sky with my left eye with the cross hair of the finder superimposed on it. Once I was near the object I would close my left eye and finish the slew using the finder. That gives you the best of both worlds; a telrad-like view for coarse slewing but the ability to see many deep-sky objects in the finder.
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