I join my voice to @magicandre1981 (same glasses?) :
"Text font is too thin, so same eyestrain like on SO."
I'm not referring to the text of posts or answers, but for example to the lists of posts. The black is more readable after zooming into the page (which is not really a good solution), but the blue is too faint to read without strain and even more so for posts that have been visited.