Determining the power of a negative lens field expander

George C. Woo; Brian Ing; Manho Lee

doi:10.1111/j.1444-0938.2001.tb04960.x

Determining the power of a negative lens field expander

George C. Woo, Brian Ing, Manho Lee

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

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.

Original language	English
Pages (from-to)	162-164
Number of pages	3
Journal	Clinical and Experimental Optometry
Volume	84
Issue number	3
DOIs	https://doi.org/10.1111/j.1444-0938.2001.tb04960.x
Publication status	Published - May 2001

Keywords

Lens power determination
Visual field expander

ASJC Scopus subject areas

Ophthalmology
Optometry

More information

10.1111/j.1444-0938.2001.tb04960.x

Cite this

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Determining the power of a negative lens field expander

Abstract

Keywords

ASJC Scopus subject areas

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