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http://dx.doi.org/10.14479/jkoos.2013.18.3.241

A Comparative Analysis Study on Distance Contrast Sensitivities According to Progressive Lens Design  

Shin, Dong-Min (Department of Optometry, Konyang university)
Kim, Soo-Hyun (Department of Optometry, Konyang university)
Jeong, Ju-Hyun (Department of Optometry, Konyang university)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.18, no.3, 2013 , pp. 241-246 More about this Journal
Abstract
Purpose: The aim of this study was a comparative analysis of the effect of distance contrast sensitivity when wearing free-form progressive lens and conventional progressive lens. Methods: The 20 subjects who do not have any ocular diseases were participated in this study. Contrast sensitivities at 5 different levels of spatial frequency were conducted by using FACT (Stereo Optical, USA). Results: Contrast sensitivity was measured for free-form progressive lens and conventional progressive lens in the order of right eye, left eye and binocular. Right/left/binocular contrast sensitivity values of the free-form progressive lenses compared to the conventional progressive lenses were higher 16%/17%/11% at A(1.5 cpd) of spatial frequency, 11%/5%/5% at B(3 cpd) of spatial frequency, 6%/6%/9% at C(6 cpd) of spatial frequency, 19%/16%/13% at D(12 cpd) of spatial frequency, 4%/3%/18% at E(18 cpd) of spatial frequency. Conclusions: In all the area of spatial frequency, distance contrast sensitivity values were measured highly on free-form progressive lens than on conventional progressive lens.
Keywords
Contrast sensitivity; F.A.C.T.; Spatial frequency; Free-form progressive lens;
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