Hate to tell you sweetie, but you're developing a "slow focus". It happens to all of us once we stop growin and start wearin out so to speak... Best thing to do is see an eye doctor. You will probably also find it much more difficult than in prior tests, as he's changing the lenses during the test. Which one is better A or B? Oooh I don't know - do that again... Until then, take more breaks, but I think you'll find that it's just gonna happen anyway. If you're reading a book and someone comes into the room and you look up (after quite a few minutes of reading) doesn't the same thing happen? I was a bookkeeper and I noticed it at first when an employee would come into my office and I had to look up from my little numbers. It took a while to adjust. Glasses help some, but the focus is still slow. And not to be contradictory, but my eye doctor says cheaters can hurt in the long run more than help because if you have astigmatism or something like that it can exacerbate the problem. So, please if you haven't been in a while - it's time to go see the eye doc.
Hugs to you,
Gayle