Open Access
A handbook for the vision of presbyopes. Elsner (Münch. med. W., 1928, No. 3)
Publication year - 1928
Publication title -
kazanskij medicinskij žurnal
Language(s) - English
Resource type - Journals
eISSN - 2587-9359
pISSN - 0368-4814
DOI - 10.17816/kazmj90852
Subject(s) - optometry , presbyopia , recall , psychology , optics , medicine , physics , cognitive psychology
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.