I've been wearing contact lenes for 20 years. For the past 10 years, I've
wearing Durasoft 3 contact lenses with the same prescription (Dia 14.5, BC
8.6). Although I have monovision with bad myopia (-12.5...lost left vision
long time ago), my corrected vision has been fine. Recently, I noticed that
my corrected vision was often so unfocused and blurry (I couldn't read small
letters well). So, I got a new Durasoft 3 lens. Still my vision was
unfocused and blurry although a few blinks sometimes got me back to better
vision. I even tried the same type of Durasoft with a higher power (-13.5),
but to my surprise, my corrected vision didn't improve...still unfocused
just like the vision with a -12.5 lens. It seemed like soft lenses couldn't
correct my vision any more.

So, has my eye become unsuitable for soft lenses after 20 years?  Has the
geometry of my eye suddenly changed and made my prescription obsolete (it
that possible)?  Have Durasoft lenses somehow become unfit for my eye? Or,
something else? I believe my uncorrect vision remains the same. If it got
worse, I'd notice. Without wearing a lens, I have no problem reading tiniest
letters.

I just want to get a sense of what's happening before seeing a doc...