Re: Still stereoscopic
Quote: "will probably get eye strain with longer use"
In real life, as you look around in the real world at real objects, they can be close, far, mid distant etc. Your eyes have to adjust to those distances, and it's this adjustment that causes eye strain, especially if you are switching between distant objects, and then close to. (e.g. Look at a map, look at the horizon, map, horizon, map, horizon, ouch after a while).
The VR lens systems are all designed so that your eyes are at a fixed mid focal point, that should be relaxed for your eyes.
And as you point out, this is not real 3D, but stereoscopic, so switching between far and close objects in the virtual world, doesn't require your eyes to actually refocus, as all the VR objects, are all at the exact same focal distance. So the same map, horizon, map, horizon switching in VR, doesn't require any focal changes in your eyes.