Bifocal lenses

Eyeglass lens with two distinct optical powers

Wikidata

Source:

Works from the collections

2 works

Books
Online
Special offers in eyewear / Optical Department, Gamages.
Gamages Ltd. Optical DepartmentDate: [1930?]
Books
Bifocal lenses : a Stigmat publication / Stigmat Limited.
Stigmat Limited.Date: [1952]