THE TELEGRAPH
http://www.telegraph.co.uk/science/2016/10/23/internet-is-becoming-unreadable-because-of-a-trend-towards-light/
Dr Simon Harper, an experimental Computer Scientist in Human Computer Interaction and Information Systems at the University of Manchester, said: "Black text on a white background may convey a certain harshness, grey text, on the other hand, may convey a softer more friendly feeling.
"But for some, these design choices come at the cost of legibility, fatigue and comprehension. We call this a situational impairment, whereby the user is disabled by the device, design, environment, or context of use.
"Straining to see text will give many a disabling experience. In the new world of cutting edge digital design all of us will at some point become impaired.
"Making sure that controls are present to conform the design to the user, so that the user doesn't always have to conform themselves to the design - sometimes and impossible requirement, is the only viable option."