Thanks guys for all replies!
Yesterday I had the same conversation with a guy and he told me that it's my monitor's "fault" that I can't see dots from far away.
I have an old EIZO L557 (
http://www.eizo.com/SUPPORT/discontinued/lcd/l557.asp) and if you check its specs, I'd say that they are quite outdated.
Maybe with a new monitor I'll be able to solve the problem.