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I think it may have something to do with less strain on your eyes when focusing on distant screen than one up close. I have Quest 2, I really enjoy watching fla

I think it may have something to do with less strain on your eyes when focusing on distant screen than one up close. I have Quest 2, I really enjoy watching flat 2d videos on it. Even with screen-door effect, sometimes, I prefer to watch shows on it.

the_gastropod 3y ago
I'm largely an ignoramus about how eyeballs function. But this sounds... suspicious. When a screen is inches away from your eyeball, isn't your eye focusing on that? I'd expect a VR headset to cause more eye strain than almost any alternative. Am I misunderstanding something?
- FumblingBear 3y ago
  My understanding of it is that the eye-strain that people tend to get isn't from your eyes focusing on the glass, but rather due to the Vergence-Accommodation Conflict (VAC)[0]. Essentially, there's a mismatch between the vergence (a movement of both eyes in opposite directions simultaneously for a binocular-style effect), and the accommodation of the eye (the way your eyes change focus based on distance). When those two things aren't in alignment, you can get a feeling of eye-strain. The way the lenses bend the light make it so the focal length that you're focusing on is further than the screen in front of you, so that isn't what is causing the eye strain. Mind you, this is just my layman's understanding of the subject, so definitely take it with a grain of salt. [0] - https://en.wikipedia.org/wiki/Vergence-accommodation_conflict https://en.wikipedia.org/wiki/Vergence-accommodation_conflic...
  - ed 3y ago
    Focal depth is fixed to ~1.3m (for quest 3, don’t think we know the value for AVP yet).[1] So you’re not focusing on the glass, but on the image at that virtual depth. The strain comes from looking at things rendered further or closer than 1.3m. 1 - https://x.com/id_aa_carmack/status/1371485209603022853 https://x.com/id_aa_carmack/status/1371485209603022853

the_gastropod 3y ago

I'm largely an ignoramus about how eyeballs function. But this sounds... suspicious. When a screen is inches away from your eyeball, isn't your eye focusing on that? I'd expect a VR headset to cause more eye strain than almost any alternative. Am I misunderstanding something?

FumblingBear 3y ago
My understanding of it is that the eye-strain that people tend to get isn't from your eyes focusing on the glass, but rather due to the Vergence-Accommodation Conflict (VAC)[0]. Essentially, there's a mismatch between the vergence (a movement of both eyes in opposite directions simultaneously for a binocular-style effect), and the accommodation of the eye (the way your eyes change focus based on distance). When those two things aren't in alignment, you can get a feeling of eye-strain. The way the lenses bend the light make it so the focal length that you're focusing on is further than the screen in front of you, so that isn't what is causing the eye strain. Mind you, this is just my layman's understanding of the subject, so definitely take it with a grain of salt. [0] - https://en.wikipedia.org/wiki/Vergence-accommodation_conflict https://en.wikipedia.org/wiki/Vergence-accommodation_conflic...
- ed 3y ago
  Focal depth is fixed to ~1.3m (for quest 3, don’t think we know the value for AVP yet).[1] So you’re not focusing on the glass, but on the image at that virtual depth. The strain comes from looking at things rendered further or closer than 1.3m. 1 - https://x.com/id_aa_carmack/status/1371485209603022853 https://x.com/id_aa_carmack/status/1371485209603022853