Some VR users (and IMAX 3D customers) have reported 'learning' stereovision.
I'm pretty sure I'm stereoblind. I think my brain is too lazy to combine images into 3D. Pot seemed to kick my brain into overdrive and process that signal. My friend laughs at me for "seeing in 3D for the first time" and doesn't believe me.
Even with only one eye, it has to focus differently for different distances. I think that information is somewhere present in the brain and can be used (even when not consciously accessible)
The Mind's Eye by Oliver Sacks has an interesting chapter on a woman who managed to develop stereovision in her late 40s through vision therapy.