A large monitor for me is a 28 inch 4K unit, so exactly the same pixel pitch as my 14" 1920x1080 laptop. It is near the edge of me being able to resolve individ

A large monitor for me is a 28 inch 4K unit, so exactly the same pixel pitch as my 14" 1920x1080 laptop. It is near the edge of me being able to resolve individual high-contrast pixels versus seeing them averaged together. The distance from eyes to a desktop screen for me is around 30 inches. A laptop might be around 25 inches, depending on where or how I sit. I am relatively tall, so "arms length" for me is further away than for some people and I have a long lap too... I know this because I am in my late 40s and have recently quantified such things for my optometrist! I recommend getting "computer glasses" with an appropriate near-middle distance prescription, if you are experiencing presbyopia.