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Title: Determining the power of a negative lens field expander
Authors: Woo, GC 
Ing, B
Lee, MH
Keywords: Lens power determination
Visual field expander
Issue Date: 2001
Publisher: Wiley-Blackwell
Source: Clinical and experimental optometry, 2001, v. 84, no. 3, p. 162-164 How to cite?
Journal: Clinical and experimental optometry 
Abstract: In 1984, Kozlowski, Mainster and Avila derived a formula for the power of the lens needed in the negative lens field expander. Their method is based on the principle of telescopic magnification. In this technical note, we use the principle of spectacle magnification and obtain the power of the same lens. Both methods are presented for comparison. Practitioners may choose either method in determining the power of the negative lens field expander for their low vision patients, but the spectacle magnification method has the advantages of simplicity and familiarity to ophthalmic practitioners.
ISSN: 0816-4622
EISSN: 1444-0938
DOI: 10.1111/j.1444-0938.2001.tb04960.x
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