A handbook for the vision of presbyopes. Elsner (Münch. med. W., 1928, No. 3)
Kazan medical journal ›› 1928, Vol. 24 ›› Issue (6) : 590 -590.
A handbook for the vision of presbyopes. Elsner (Münch. med. W., 1928, No. 3)
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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