Back over a couple of decades ago when I was selling, I would always ask customers if they were left eyed when they showed interest in a Nikon FM(2) or FE(2). If they were, I'd tell them it would cost $250 not to get poked in the right eye while metering, the price of a motor winder to keep the meter on with the manual advance lever tucked in.

Actually, I wouldn't ask, since few people knew. I'd just hand them a camera and ask them to look through it so they'd do it without thinking about it. Left-eyed users of rangefinders are also keenly aware of the problem, and get no joy from built-in 1:1 finders.