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KMID : 1011420200250020099
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Journal of Korean Ophthalmic Optics Society
2020 Volume.25 No. 2 p.99 ~ p.102
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Proposal of Corridor Pattern to Consider in Progressive Addition Lens Design
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Moon Byeong-Yeon
Yu Dong-Sik
Kim Sang-Yeob
Cho Hyun-Gug
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Abstract
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Purpose: To propose a corridor pattern considering interpupillary distances that depend on fixative distances in progressive addition lens (PAL) design.
Methods: Subjects (22.3 ± 3.1 years, 15 men and 15 women) had normal fixation ability at far and near distances and had an exophoria range of 0~6 △ at near distances. Subjects were measured at interpupillary distances of 5, 4, 3, 2, 1.5, 1, 0.5, and 0.4 m, respectively. A functional formula was fitted from the dependence of interpupillary distance on fixative distance. The average corridor length was calculated using 880 cases of PAL fitting.
Results: The fitted formula from the dependence of interpupillary distance on fixative distance represented an exponential curve and showed a correlation coefficient of ?0.942 with accommodative diopters calculated at every fixative distance. The average corridor length was approximately 9 mm in 880 cases of PAL fitting.
Conclusions: Proper PAL design of corridor patterns should consider the exponential curve fitted from the dependence of the interpupillary distance on fixative distance. Moreover, the corridor length should be designed to be shorter for PAL users.
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KEYWORD
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Progressive Addition Lens (PAL), Progressive corridor pattern, Progressive corridor length
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