목적: 누진굴절력렌즈의 피팅을 위하여 습관적인 독서자세에서 측정한 누진대 길이의 분포를 알아보았다. 방법: 2010년 1월부터 2012년 6월까지 39~83세의 남녀 5,925명을 대상으로 Eye Move Photographing (EMP)을 이용하여 누진대 길이를 측정하였고, 연령대별 분포를 분석하였다. 결과: 측정된 누진대 길이(아이포인트에서 근용부 측정점까지) 분포는 10~11mm(34.45%), 12~13mm (32.66), 8~9mm(16.96%), 14~15mm(10.13%), 6~7mm(4.30%), 16~17mm(1.27%), 그리고 18~19mm (0.25%)로 나타났다. 39~49세에서는 10~11mm가 42.05%로 가장 많은 비율이었고, 50~59세, 60~69세, 그리고 70~83세에서는 12~13mm가 각각 31.84%, 35.48%, 그리고 46.15%로 가장 많은 비율이었다. 결론: 안경실무 종사자들은 습관적 독서자세에서 정확한 누진대 길이를 측정할 수 있는 진보적인 방법 들을 계속적으로 고안할 필요가 있다.

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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