Your eyes are still looking at an object (roughly?) 10cm away from your face: the screens. Your eyes are not adjusting focus. Any focus (or blur) you see in VR is simulated depth.
So yes, the issue is indeed the distance where your eyes are focussing, caused by the fact that they're constantly focussing on something very close to your face.
My optician told me its like stretching your arm while holding something heavy. At first that's no problem. But eventually your muscles will start burning and you can't hold it and even when you relax your arm it still hurts if you held it for too long.
As far as I'm aware there are no VR headsets yet that adjust the live generated depth vision based on the diaphragm of your eyes. That would be wild.
So yes, the issue is indeed the distance where your eyes are focussing, caused by the fact that they're constantly focussing on something very close to your face.
My optician told me its like stretching your arm while holding something heavy. At first that's no problem. But eventually your muscles will start burning and you can't hold it and even when you relax your arm it still hurts if you held it for too long.
As far as I'm aware there are no VR headsets yet that adjust the live generated depth vision based on the diaphragm of your eyes. That would be wild.