I diagnosed myself with having an astigmatism while in the Navy in 1965, off the coast of Vietnam. I noticed a difference in the lines of a bar-code when I was sitting up or lying down at about 15 feet from the cardboard box. It has only gotten marginally worse 47 years later.
Maybe we should ask Pentax if they can give us an astigmatism correction as well as the +10 -5 focus correction we already have. :) On Sep 24, 2012, at 17:19 , Mark Roberts wrote: > Mark Roberts wrote: > >> It's probably a mistranslation, then. Astigmatism is a lens aberration >> in which light rays are bent differently along the horizontal axis >> with respect to the vertical. Or vice-versa ;-) > > To clarify: Imagine a "+" sign. With a lens exhibiting significant > astigmatism you could get the horizontal bar of the "+" in focus but > not the vertical bar. Or you could get the vertical bar in focus but > not the horizontal. If your eyes have astigmatism that means your > glasses or contact lenses cost extra. :) -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
