This was me totally, culminating about 4-5 years ago when my missus saw me, for the umpteenth time, squinting trying to read the cooking instructions on the back of a packet and telling me in no uncertain terms that if I didn't make an eye-test appointment she would. Sure enough, I was prescribed glasses and the first time I put them on the difference was like night and day.
Coincidentally, I had another eye-test this weekend - the first since that initial pair was prescribed. My vision has deteriorated a little from what it was five years ago, but not dramatically, which was pleasing. I'm assuming the cause of the problem is that I've worked in front of a computer screen my entire working life - in some ways I did well getting to my mid-forties before needing specs. That has left me with eyeballs that are not spherical anymore, but shaped like rugby balls - pretty alarming when you think about it! Then again, as I'm 50 this year, screen-use may be a total red-herring and it's just age related.