Comment by numpad0

I'm not sure if I understand your thought process. I'm talking about distance errors between center of screen and edges of the screen, not singular distance. Frankly you can just paste this to ChatGPT. It's correct enough for this type of topics.

> let distance between head to display 20 inches, screen width 20 inches as well, tell me how to calculate distance errors between center of screen to edges of screen

^ this yields a figure of 2.36 inches among few kBs of padding data

> does that mean the eyes need to be refocused when there's distance error of 2.36 inches, ok to go step by step for this

^ this yields a figure of 30 um among few kBs of padding data

> does that mean the eyes need to be refocused when there's distance error of 2.36 inches, ok to go step by step for this

^ this yields such elaborate responses as "Estimated DoF is about ±1 to 2 inches around the focus point", "Yes, the 2.36-inch distance error is right at or slightly beyond the typical depth of field of the human eye at 20 inches.", "The effect is subtle, but in precision tasks or long durations, your eyes may notice the strain"

Which are all more than correct enough. btw the math is mostly just basic Pythagorean theorem so not hard to follow.