clip on / flip up reading glasses (was: Re: PDF viewer for elderly)

[rhkramer@gmail.com]

On Tuesday, June 03, 2025 03:49:49 AM Chris Green wrote:
> Richard Owlett <rowlett@access.net> wrote:
> > ROFL - Been wearing tri-focals since my 30's.
> > Also have wicked astigmatism correct that eliminates trying to use "off
> > the shelf" "reading glasses".

I also wear trifocals, and have astigmatism.

They make clip on / flip up reading glasses.  I see the best price on 
Aliexpress (other places I've checked are 2 to 6 times the price).  

I bought several (they were less expensive before the tariffs) to experiment 
with determining what magnification I should get on a pair of what I'll call  
of computer bifocals -- I want a pair of bifocals with near vision on the 
bottom and the rest of the lens to be suitable for viewing my computer from 
34" away. 

So far +1.25 isn't quite good enough, and I'm probably going to buy the flip 
ups in +1.50 and +1.75 to see which does the job.  (IIUC, the "near vision 
portion of a bifocal or trifocal is +2.50 by default.)

(Aside: I rigged a hanging thing so I could measure the distant that my eyes 
are from my computer screen when I am sitting normally.)