system
A chat on subreddit /r/pcmasterrace
human
The human eye also has depth of field, but you don't perceive it in the same way you would from a camera because you can't "look" at the out of focus area - what your fovea is looking at will be the focus point and so the out of focus area will be peripheral.
gpt
Oh you can definitely experience the game's DoF effect in real life. Its called Myopia, and my eyes "support" this feature just fine.   
Oh the joy, when I find out a game has it!