Catalogue Number: 2755
Lederer Lens Trial Set
Category: Spectacles and lenses
Sub-Category: Low vision aid
Designer/inventor: Josef Lederer
Year Of Publication/Manufacture: c1955
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Australia
Description Of Item: Damaged cardboard box which originally contained 3 trial lenses of powers: 6x (+24D), 4x (+16D) and 2.5x (10D). This box contains 3 +24D lenses and 2 +16D lenses. These high powered plus lenses were developed to provide optics most suited for use as reading low vision aids. The lenses are in second-hand conventional trial case rims so the designation of power on the rim is irrelevant. Box: 148mm x 51mm x 14mm. Each lens 37mm diam.
Historical Significance: Professor Lederer (1921-2007) was professor of optometry at the University of NSW. He was the first professor of optometry in Australia. He advocated better optometric care for patients with low vision and designed this set of lenses to provide high plus correction for low vision. The design was published in Nature and Aust J Optom. [Lederer J. A new development in aids for sub-normal vision. Nature 1954; 4438: 997. Lederer J. The 'Lederer Lenses', a new development in sub-normal vision aids. Aust J Optom 1954;37: 302. See also Aust J Optom, Vol 37 Issue 5 Sep 29, 1956: The Lederer Lens by W G Kett. 'This lens was the first designed in Australia for the specific purpose of aiding those beyond the help of ordinary ophthalmic lenses'. Lederer's career and contribution to optometry is described by Alexander JA. Emeritus Professor Josef Lederer - A pioneer of low vision care Clin Exp Optom 2001; 84: 171-174. His obituary is at Cole BL. Emeritus Professor Josef Lederer 1921-2007 Clin Exper Optom 2007; 90: 388-389. See these items on this web site under the tab 'People who made history'
How Acquired: Donated by Alan Isaacs
Date Acquired: Sep 2015
Condition: Box: very poor, Lenses: good
Location: Archive room. West wall. Unit 5 Drawer 2