No, you misunderstand. The lenses between your eyes and the screens will give it a focal distance of something like ~2 meters. So from an eye health / focus point of view it will be like staring at a wall 2 meters away all day (which is possibly better than staring at a computer screen .5m away!). This is why nearsighted people still need some sort of accommodation in VR.
The thing to realize is there's two different kinds of focusing: the first is the one everyone thinks of which is how your two eyes work together. They point together when focusing close, and spread apart when focusing far. But separately each eye also can focus individually. Try covering one eye and holding up a finger at arms' length for your other eye to focus on. Then switch to focusing on the wall with that eye, and back. You'll feel your eye muscle making the adjustment.
In the real world these two kinds of focuses normally operate in sync. If you want to look far, you'll normally both point your eyes further apart and adjust the individual eye focus for distance, and when you want to look close, you'll point your eyes kind of together and adjust each eye for near focus.
But in VR, your "focal distance" is fixed at the generally comfortable ~2m I mentioned. However, because it's a 3D world you can look near and far, and in that case you'll change how your eyes point but not the other kind of focus.
So I'm not sure to what extent that causes problems, if any, but it's different from staring at something a few centimeters away.
I undersood now, the text "VR headset screen" in the wikipedia page confused me. FYI, the latter one, individual eye's focus is the one which causes myopia.
The thing to realize is there's two different kinds of focusing: the first is the one everyone thinks of which is how your two eyes work together. They point together when focusing close, and spread apart when focusing far. But separately each eye also can focus individually. Try covering one eye and holding up a finger at arms' length for your other eye to focus on. Then switch to focusing on the wall with that eye, and back. You'll feel your eye muscle making the adjustment.
In the real world these two kinds of focuses normally operate in sync. If you want to look far, you'll normally both point your eyes further apart and adjust the individual eye focus for distance, and when you want to look close, you'll point your eyes kind of together and adjust each eye for near focus.
But in VR, your "focal distance" is fixed at the generally comfortable ~2m I mentioned. However, because it's a 3D world you can look near and far, and in that case you'll change how your eyes point but not the other kind of focus.
So I'm not sure to what extent that causes problems, if any, but it's different from staring at something a few centimeters away.