Does any one have any information about the width of the sharp focal area of the retina (the Macula)? I am trying to get an understanding of how this could impact the ideal length for a line of copy.
Is there a formula that would give me (for someone with good vision): If you are ZZcm from the screen then the line length should be XX and the font size should be YY.
I know there are a lot more variables involved such as Pixel Density and Font type, I am just trying to understand the main biological principles of readability online.
*Apologies if any of the terminology is wrong.