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KMID : 1159320120140040295
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Korean Journal of Vision Science
2012 Volume.14 No. 4 p.295 ~ p.301
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Analysis of Lengths of Progressive Corridor at Habitual Reading Posture
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Lee Kwon-Jeong
Moon Byeong-Yeon
Cho Hyun-Gug
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Abstract
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Purpose: This study was designed to investigate the distribution for lengths of progressive corridor at habitual reading posture for fitting of progressive addition lenses (PALs). Methods: Measurement was performed to 5,925 subjects between 39 and 83 years of age using EMP from January 2010 to June 2012. The measured values were analyzed the distribution according to age bands. Result: The distribution of measured lengths of progressive corridor (from eyepoint to near reference point) was 34.45% of 10~11 mm, 32.66% of 12~13 mm, 16.96% of 8~9 mm, 10.13% of 14~15 mm, 4.30% of 6~7 mm, 1.27% of 16~17 mm, and 0.25% of 18~19 mm. The length of 10~11 mm was accounted for the largest percentage in 39~49 age band (42.05%) and 12~13 mm was accounted for the largest percentage in all of 50~59 age band (31.84%), 60~69 age band (35.48%), and 70~83 age band (46.15%). Conclusion: The practitioners have to invent the advanced methods continuously for accurate measurement of the length of progressive corridor at habitual reading posture.
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KEYWORD
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progressive addition lenses, length of progressive corridor, EMP
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