[Use of flat Frenel's lenses for increasing close-up visual acuity in persons with poor vision].

Autor: Lebekhov PI, Kerova IK, Krizhevskaia FV, Zhdanov DD
Jazyk: ruština
Zdroj: Vestnik oftalmologii [Vestn Oftalmol] 1974 Nov-Dec (6), pp. 52-4.
Databáze: MEDLINE