As far as I know it relies on the fact that you only have clear vision in the central 20% of you FoV, and your brain just makes the rest up. Also the big blind spot

[–] [email protected] 5 points 10 months ago (1 children)

I thought it was 2°? A dime held out at arms length if I recall.

[–] [email protected] 3 points 10 months ago (1 children)

Honestly, idfk. Maybe that's the blind spot?

Just now looking at things the clear bit of my FoV feels like 20%...which is clearly suuuper scientific. I'm getting ill, and have enough energy to comment on the internet or fact check myself....not both.

[–] [email protected] 4 points 10 months ago* (last edited 10 months ago) (1 children)

Wikipedia says it's more like +/-1° or about 2° is where you have more cones than rods. +/-10° has elevated cones compared to other parts of your FOV

That being said, not sure how much I trust this graph given that I clearly have a blind spot on the right side for my right eye (temple side) but this marks it as only on the nose side? Unless I'm mistaken

E: am mistaken

[–] [email protected] 1 points 10 months ago (1 children)

Everyone's eyes are different. I'm sure there's a blind spot that's supposed to be where they say it is, but who's to say your eyes are exactly like the average eye?

[–] [email protected] 2 points 10 months ago (1 children)

The blind spot is where the nerves pass through the retina to reach your optic nerve. I was mistaken; because the image is flipped when it passes through the lens, the nose side has the blind spot but visually the hole is on the temple side, as is shown here

[–] [email protected] 1 points 10 months ago

Neat!

[–] [email protected] 8 points 10 months ago (1 children)

I've seen this illusion on paper and it still works. Not that printed paper is functionally different from pixels.

[–] [email protected] 4 points 10 months ago

Ha, good point. I'm showing my age here. I understand our modern phone screens have resolution approaching that of good print, but when I think of a screen my brain still defaults to something like a 14" VGA at 57PPI :-)