A handbook for the vision of presbyopes. Elsner (Münch. med. W., 1928, No. 3)
Kazan medical journal ›› 1928, Vol. 24 ›› Issue (6) : 590 -590.
Helmholtz also pointed out the interesting fact that visually impaired people, especially presbyopes, can often see clearly and even read without glasses if they look through a small hole or slit. But this indication has somehow gone unnoticed, and now the author finds it useful to recall it.
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