Steam Hardware
A place to discuss and support all Steam Hardware, including Steam Deck, Steam Machine, Steam Frame, and SteamOS in general.
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Interestingly enough, the focal length of the lenses and perceived distance due to stereoscopic parallax are completely unrelated.
The lenses can't reshape themselves, so the screens have to always sit at a constant perceived distance from your eyes, typically set around the middle of where the eyes are used to focusing, about 2 meters away. This isn't a problem, because the effect of the brain taking depth cues from parallax is much stronger, so the focal length detail just fades into the background.
What this all means though is that whether or not you need glasses in a VR headset is entirely dependent on whether you need glasses to see objects 2 meters away outside VR. This remains true even when objects in VR are much closer or farther as perceived by stereoscopic vision.
Thanks!
I didn't think the perceived distance mattered - as you say, things rendered as "close" were not easier to see without glasses when I explored this phenomenon.
However, I didn't realize that it was all due to the focal length of the lenses. I know very little about lenses and vision.
So the lenses essentially make it so that the headset screens feel ~2 meters away, as far as your ability to see things near/far?
Thanks!
Yep, you got it.