I.e. the worsening of vision that takes place after too many accumulated hours in front of a computer screen.
I had my annual eye exam this afternoon. Things were looking grim as to a prescription change; then the lights came on and I put my glasses back on my face. The gruff-but-kindly eye doctor said, "Look, I'll show you how things will be better now. Can you read this?" and put up on the screen a line that had seemed unintelligible when viewed through the lenses of the diagnostic apparatus.
"Yes," I said, and proceeded to rattle off the letters. He was nonplussed. Apparently my glasses allow me to see with an improbably level of clarity, at my current prescription. So I'm getting a pair of trial contacts that are a bit worse, and we'll see what they do; my current fear is that my eyes will continue to get marginally worse every year of my life, even though they're supposed to stop changing when you're what? 25?