Hmm... down the rabbit hole. A websearch on non-prescription bifocal reading glasses (because I need them) page, led to an marketing blog explanation of bifocal, which led to the discovery of a paper on the theoretical mechanics of identifying whether or not the document was a translation or the root source and if so, the source language of a translated document, and the concept of a field of study devoted to linguistics.
I never did find a cheap source of say... 1.50 and 2.00 diopter reading glasses. (About $0.99 at the local 99cents store for cheap single focus).
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