Luckily I didn't get here until after your edit.
I've been through an ordeal with my eyes for a little over a year. Started with focus problems, then an eye infection and a stye, got rid of the infection but had to have the stye operated on. Still had focus problems. Got layed off. Managed to get new glasses just before the insurance ran out. Even though my presription was right I still couldn't see very well. Managed to see a doctor through a free clinic and found that my eye pressures were very high and evidently in the space of a few months I had developed glaucoma. Got to see a specialist through the free clinic and after a couple of tries found a treatment (eyedrops) that I could take without terrible headaches or just generally feeling really bad and now, I can see almost normally again. I did lose a little peripheral vision but not a lot and as long as I can get these eyedrops they tell me I should be ok.
I'm 53. Have been wearing bifocals for 10 - 12 years. At least now I can stand to work at the bench again. I do use a magnfying lamp for detail work but I've done that for a long time and am used to it. What I noticed initially was that my eyes wouldn't want to change focus. I could set at the bench and work for a while and then my eyes would feel tight, for lack of a better description. When I would stop it would take a while for my eyes to focus at any distance. Then it got to where anything more than 50yds or so would stay blurry. Now that my eye pressures are down it's still not perfect but a lot better than it was. Guess the rest will just have to be chalked up to getting older.
But like a buddy of mine always says, it sure beats the alternative...
Tony