I see one unless I force my eyes to work together and then I see two.
Given that any given time one of my eyes has wandered off to look at something (honestly, ladies, I am not responsible for it*), I wonder what happens to all the stuff it's seeing. It's bit like the words you type when you've forgot to click on a window on your computer desktop. Bits of me are going elsewhere. Assembling.
I have no depth vision either, and it was consistently hilarious – PE teachers of the world – to throw something at me and shout 'catch.'
*actually, this is a genuine fear, I can be inadvertently staring at someone without knowing.