作者
T Spiers, CC Hull
发表日期
2000/7
期刊
Ophthalmic and Physiological Optics
卷号
20
期号
4
页码范围
281-289
出版商
Blackwell Publishers
简介
Four binary filter designs for use in an optical Fourier filtering set‐up were evaluated when taking quantitative measurements and when qualitatively mapping the power variation of progressive power lenses (PPLs). The binary filters tested were concentric ring, linear grating, grid and “chevron” designs. The chevron filter was considered best for quantitative measurements since it permitted a vernier acuity task to be used for measuring the fringe spacing, significantly reducing errors, and it also gave information on the polarity of the lens power. The linear grating filter was considered best for qualitatively evaluating the power variation. Optical Fourier filtering and a Nidek automatic focimeter were then used to measure the powers in the distance and near portions of five PPLs of differing design. Mean measurement error was 0.04 D with a maximum value of 0.13 D. Good qualitative agreement was found between the …
引用总数
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