[va-bird] Does anyone REALLY know what their diopter adjustment does...???

  
  I hesitate to open up this can of worms on the Listserv (and I hope
that one of our fellow subscribers just happens to be an optometrist
  that can answer this in one fell swoop), but does anyone know what
the diopter adjustment on our bins ACTUALLY does???

  1-We know for a fact that most of our optics have it, and that using
it usually improves the performance of whatever brand/model we own. 
  2-Most go from L to R (minus degrees L, to plus degrees of 
change R- or vice versa, but only in rare cases). 
  
  My first impression was that it basically compensated for the
inherent difference in prescription strength that is normally present 
between one's left and right eye- simple enough, right?
  Until my father found a site on our wonderful www (while in search of
a simple answer to a seemingly simple question) that, though pertaining
to dual-eyepiece microscopes (just bins for amoebas, at least in my 
  eyes), said that the minus and plus ranges on a diopter 
adjustment-wheel ONLY pertained to degrees of nearsightedness and
farsightedness, respectively.

  This left me more boggled than ever... and raised the question of NS
versus FS being related to one's own vision rating (20/20, etc).

  After a 4 hour debate with my father + the questioning of every
nearsighted and farsighted birder I know, I've gotten no closer to the 
answer of this simple question: What does our friendly diopter ACTUALLY
do?? 

  Any insight is welcomed, though off the Listserv might be more
prudent...

 
   Ian C. Topolsky
   Hamilton, VA











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