Sorry for the lame tiny post, my dad just dropped by unannounced and I totally borked hitting the deadline with a real piece. So! Let’s turn to Roger Ebert and multiple Oscar winner for cinematography Walter Murch for an interesting take on why we’re not really designed to process 3D cinema images.
…the deeper problem is that the audience must focus their eyes at the plane of the screen — say it is 80 feet away. This is constant no matter what.
But their eyes must converge at perhaps 10 feet away, then 60 feet, then 120 feet, and so on, depending on what the illusion is. So 3D films require us to focus at one distance and converge at another. And 600 million years of evolution has never presented this problem before. All living things with eyes have always focussed and converged at the same point.