The following paragraph is taken from a WIRED article entitled What Are Screens Doing to Our Eyes—and Our Ability to See?:
But of course now so many of us read all day long. And I opt to flood my field of vision with the merry play of pixels and emoji rather than the less scintillating, brown-gray “real world.” This means wearing the reading glasses, even on the street, and affecting blindness to everything but my phone.
I only needed reading glasses when I was in my mid-forties – to read the fine prints and food labels. Despite all the books I have read and the ridiculous amount of screen time I have logged-in, I am rather fortunate to still have normal and relatively healthy eyesight. I have stopped myself from reading in the dark in a laying down position, but I do need to gaze out once a while to stop or even reverse this modern day disease of deteriorating eyesight.