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
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.
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