Tiring eyes

I'm beginning to recognize that the eye trouble is, in some aspects, worse when I spend a lot of time reading, typing, etc..  The pain and the hazy patch seem to increase under such circumstances.  Earlier tonight, though, I noticed difficulty with distance vision, trying to read the price of gas on a sign at a station.  When I saw the red LED numbers doubled, it bothered me.  I'm used to noticing double vision up close.  I struggled to get the images to align, but I couldn't.  It seemed easier, or at least didn't stand out so sharply, when viewing the landscape ahead on the highway coming home, but I am certain that my visual acuity wasn't as sharp as I am accustomed to experiencing.