Insufficient text contrast has been noted in reviews of Plasma, for example http://www.ocsmag.com/2017/10/18/plasma-5-11-keep-the-momentum-going/
I've been using this myself for months; strongly prefer it to the standard color scheme that has less text contrast. Compare old vs new and look at the text:
Old:
{F5444194}
New:
{F5444195}
IMHO the second one is much clearer and less muddy, and therefore **easier** on the eyes, not harder.