Noah Yuan-Vogel
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Another problem with 3D that makes people sick is the fact that in the real world you can focus on whatever you want, whereas in the film world you can only focus on what the director has in focus. So if you try to look at the background in 3D your brain will try to focus and resolve it and it can't. This one is less noticeable of an issue because our brains have been trained from years and years of film and tv to not really pay attention to what is out of focus but wouldn't it be interesting in the future to have HFR 3D with an added technology of something like a Lytro camera where the viewer gets to decide what is in focus?
I was under the impression the issue is less the focus and more the convergence since whatever happens we are still actually only focusing on the screen plane. In real life, our eyes pretty much always focus and converge to the same point/distance, whereas that is not always the case when watching 3D images projected on a flat screen. Our eyes are always focused on the screen but often forced to converge elsewhere depending on what we are looking at in the frame and how the convergence was set on-set/in-post.