Will nearsightedness become a problem from extended use of VR I wonder? Staring at a computer screen in work is bad enough, to add more hours of staring at a screen cm's away from your eyes can't help.
Maybe being sure to focus on the horizon or distant objects for an amount of time would negate any ill effects.
If you have problems ehen working on a screen it's because it's a small part of your fov and most likely too bright compared with your surrounds.
Current LCD monitors are now practically capable of eye searing levels of light output, so turn that backlighting down to maybe 20% of normal.
VR this is not a problem since it fills nearly all of your fov, and the natural responses of the eye can fully work.
Reason for example of why for so long people, have been told to not watch tv in the dark. Is that the screen is so small its not large enough to trigger the responses in the eye that when adjusted to the dark, to deal with the brightness of the small screen.
Again if the screen goes big enough your eyes will adjust naturally and this has the added effect of increasing immersion for movie watching tenfold.
Now for this to truly work you probably need a screen larger than 65" and closer to it than 3m.