[Leica] Leica M diopters (Myopia vs. Presbyopia)

[pklein at threshinc.com (Peter Klein)]

Question:  Do the Leica diopters have a rubber eyepiece or a metal one?

Here's why I ask.  Yesterday's shooting with my M8 brought home a 
change.  I am no longer nearsighted in either eye, so briefly taking off 
my glasses to read the controls no longer works.  For distance vision, 
my left eye needs no correction. My right (shooting) eye takes +0.25 
diopter and a bit of astigmatism correction  Plus some prism which keeps 
my eyes aligned when looking to one side, especially important when 
driving.  In general, though, I am quite comfortable walking around 
without glasses.

Reading, computer, and anything closer than ~6' (~2m) requires a 
corrective lens.  With the OM-D this is no problem. I just wear my 
bifocals, set the diopter for best focus, and all's well.

The M8 is another matter.   I can shoot it without glasses, not perfect, 
but usable.  But then I can't read the controls and menus. I can shoot 
it with glasses, but then I definitely need a diopter correction.  I 
have one of those Megaperls 1.1x magnifiers, which has a variable 
diopter correction. It works well, and I love using it bare-eyed.  But 
its eyepiece is metal and has two little notches in it where you insert 
your fingernail to turn the eyepiece to adjust the diopter correction.  
So while I'd love to use the the Megaperls magnifier with my bifocals, 
the metal eyepiece would likely scratch my glasses.

So I think I'm going to need a diopter that works with the distance lens 
of my bifocals.  Or I'll have to use the Megaperls bare-eyed and have my 
glasses on a cord around my neck to read the controls. Awkward.  I even 
thought today about getting a monocle (or its equivalent, a little 
magnifying glass I could keep in my shirt pocket).  Then I could be like 
Inspector Kemp in "Young Frankenstein."

All suggestions welcome.  Monovision contacts are not really an option 
any more.

--Peter