Have you been checked out for cataracts?
Yes, indeed cataracts can cause deteriorating eyesight, as you point out.
These days cataract surgeries are done frequently and are quite successful. You want a good surgeon, and also do some research on different types of lenses that can be implanted, when they take out your cloudy one.
Check out both an ophthalmologist who specializes in cataract surgey, and a retina specialist.
See post #6.