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I suspect that if we blinked one eye at a time, there'd be more babies born. 
neilep, this is one of the best questions I've red here in a while. This is really intriguing. It has to be taken into account that other blinking animals blink with both eyes too so it must be more efficient this way, but why?
I shall now remove metatdata from images I use from now on
With only one eye open you would be stereoblind, (no it doesn't meant you can't see your Hi-Fi  ). If you blink eyes alternately objects in the scene appear to change their position (move) because of parallax. If you were a looking for the movement of prey or predator this apparent movement because of parallax would be a distraction: Looking for movement in an otherwise still scene is a lot easier then looking for movement in a moving one.