There are 4 things that come to mind that can cause rapid changes in your focusing at your age.
One is cataract. Even if the cataract does not look dense, one of the early symptoms of cataract is that it cause you to become more nearsighted. Even before it becomes noticeably cloudy, we can see a shift such as in your case.
Second is glaucoma. If the pressure is rather high, it can cause your eye to get bigger, hence more nearsighted.
Third is a corneal dystrophy. This can cause shifts in your focusing as well.
Finally is diabetes. When the blood sugar goes up too high, it can cause you to become more nearsighted as well.
These are things to look for in this case.
I hope this helps and thank you.
Hi, thanks for that. I will accept your answer, to give you positive feedback, but there is no new information in what you gave me. I already looked up a lot about it on the Internet, and I know that the things listed by you can cause my symptoms. It is the fact that I have had both glaucoma for 15 years now, and cataract was spotted already about 6 months ago, though they said not dense enough + my original short=sightedness, so my case is quite compIex. I suspect I expected too much from this service though I was aware that obviously it would be difficult to diagnose,or give me a prognosis, as you would surely have to see my eyes. What I am afraid of is the loss of my sight obviously and I would need some reassurance that it will not happen overnight.
So I am quite happy to pay you what I put down as a deposit. Are you happy with that?
The thing to do is to get your eyes checked. I can only give you limited reassurance, other than the fact that the causes I have listed are the most common and that chances are you won't be losing your vision overnight. Good luck.