“...you aren’t looking to the left and the right.”
I’m a big believer in twisting around, throwing my right arm back between the seats, and watching the back 180°, as I back up. Not always possible (think U-haul truck), but that’s SOP when I’m in my car or truck (even the wife’s prius).
I’m blind in my right eye and I’ve still managed to avoid backing over anyone.
When I was in driver’s training they taught us to turn and look.