How do some pros sit so close to the monitor?

I tried getting close to my monitor, not even in an actual match, to see how it would look like and I find myself getting distracted by the individual pixels on my screen? How do some people actually play like this?

some of them might be focused on the crosshair

i think jdm64 was on the true wave

they didnt think I believe, focus on crosshair and shoot when a pixel change