Do you focus with your right eye or left eye through the viewfinder? Any difference you find?
Too much squinting on one eye can make u 'blurr', literally as when u try to focus straight after squinting too much, u realise it places too much pressure on the squinted eye and the vision goes blurr for that eye.
It depends if you're left-dominant or right-dominant. You'll realize though that most people are right-dominant, which is why DSLR cameras are designed for right-dominant people. Many left-dominant people have complained of their nose pressing the controls on the right side, etc etc
Do you focus with your right eye or left eye through the viewfinder? Any difference you find?
Left Eye Shooting has its benefits. Check out Joe McNally's "Da Grip":
http://www.youtube.com/watch?v=EDsx3-FWfwk