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KMID : 1011420130180030241
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 3 p.241 ~ p.246
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A Comparative Analysis Study on Distance Contrast Sensitivities According to Progressive Lens Design
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Shin Dong-Min
Kim Soo-Hyun
Jeong Ju-Hyun
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Abstract
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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.
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KEYWORD
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Contrast sensitivity, F.A.C.T., Spatial frequency, Free-form progressive lens
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