When my eyes started having problems, I noticed that light emitting devices form "rays". I'm not sure if you know what I mean but let's say I was looking at the time stamp on the dvd player. The lines of the numbers actually emit "rays" like when we draw the sun in our elementary art works. I also noticed that I had frequent headaches and it was hard for me to concentrate on doing something intricate because it would then lead to another headache.
When my eyes are both opened, I can see clearly. But when I cover my left eye, my right can't see fine details clearly. Some letters of a certain size would come comepletely blurred. I suggest when you have a feeling your vision is getting worse, check your eye one at a time. Cover one eye and check the uncovered one. Use reading magazines and read it about a feet away from you.
If you notice something weird, don't hesitate to call for a doctor's appointment. Four years ago, I noticed having the symptoms I specified above and I did not have my eyes checked. I only found out I had vision problems a few months after and now the problem of my right eye is pretty bad. I'm almost 20/20 on my left and my right is 20/40. Anyway, I just wanted to share this with you guys. I know its not something new. Just treat this as a reminder. That's all for now! Take care! :)