[burpee]

Cool, another potential tool against poorly readable sites. I just created http://cantheysee.it/ for web developers to (roughly) simulate and test for users with poor eyesight.

[buro9]

Whatever that font is (Source Pro Sans), it's fairly unreadable to me (Chrome on Ubuntu).

My eyesight is not great, but having a font that is too thin doesn't help either.

I wish body text just stayed in either serif or sans-serif at 1em. Use custom fonts for headers, but let my browser preferences determine the body text.

[burpee]

Fixed, you're absolutely right - that font should only be used for headers.

[benaiah]

Only because you are using the extremely thin version. There's a thicker version of the font that's perfectly readable as body.

[buro9]

Thank you, most kind