Myopia Master와 Lenstar, KR-1 자동굴절검사기의 안구계측치 비교
Comparison of Ocular Biometry and Refractive Measurements from Myopia Master with Lenstar and KR-1 Autorefractor
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목적: Myopia Master와 Lenstar, KR-1 자동굴절검사기로 측정한 안축장, 굴절이상, 각막곡률을 비교하고자 하였다. 대상과 방법: 소아 44명 44안을 대상으로 Myopia Master, Lenstar, KR-1으로 측정한 안축장, 각막곡률, 구면렌즈대응치의 평균을 비교하고 일치도를 분석하였다. 결과: Myopia Master와 Lenstar의 안축장 평균은 24.59 ± 0.91 mm, 24.60 ± 0.91 mm로 유의한 차이가 없었다(p = 0.085). 급내상관계수 0.999, 피어슨 상관계수 0.999였다. Myopia Master와 KR-1의 구면렌즈대응치 평균은 -3.32 ± 1.75 D, -3.18 ± 1.68 D로 유의한 차이가 있었으나(p<0.001) 급내상관계수 0.996, 피어슨 상관계수 0.995였다. Myopia Master, KR-1, Lenstar의 평균각막곡률 평균은 43.15 ± 1.59 D, 43.38 ± 1.58 D, 43.32 ± 1.63 D로 유의한 차이가 있었다(p<0.001). 결론: Myopia Master와 KR-1의 구면렌즈대응치는 통계적 차이는 있으나 임상적으로 크지 않고 일치도가 높으므로 상호 교환이 가능하나, 각막곡률은 측정값의 차이를 고려할 때, 상호 교환보다는 보완적인 사용이 좋겠다. 또한 안축장은 Myopia Master와 Lenstar 사이에 양의 상관관계 및 일치도가 높고, 대부분 95% 일치한계 범위 내에 존재하나, 안축장의 특성을 고려할 때 두 기기를 호환하여 사용하는 것은 임상적으로 신중한 주의를 기울여야 한다.
Abstract
Purpose: To compare axial length (AL), keratometry (K), and refractive measurements using Myopia Master, Lenstar, and KR-1 autorefractor. Methods: The study involved 44 eyes of 44 children who visited our clinic. We compared AL, flat K, steep K, mean K, and spherical equivalent (SE) measured by Myopia Master, Lenstar, and KR-1. We utilized a paired t-test and RM-ANOVA to compare mean differences and used Bland–Altman plots, intraclass correlation coefficients (ICCs), and Pearson correlation tests for agreement analysis. Results: The mean ALs (mm) measured with Myopia Master and Lenstar were 24.59 ± 0.91 mm and 24.60 ± 0.91 mm, respectively, with no statistical differences (p = 0.085). Both the ICC and Pearson correlation coefficient were 0.999. The mean SEs (D) measured with Myopia Master and KR-1 were -3.32 ± 1.75 D and -3.18 ± 1.68 D, respectively, with significant differences (p < 0.001). The ICC was 0.996 and the Pearson correlation coefficient was 0.995. The mean K (D) values measured by Myopia Master, KR-1, and Lenstar were 43.15 ± 1.59 D, 43.38 ± 1.58 D, and 43.32 ± 1.63 D, respectively, and differed significantly (p < 0.001). Conclusions: While statistical differences emerged in SEs between Myopia Master and KR-1, the differences were not clinically significant and the tools may be used interchangeably due to their good agreement. However, measured K values differed among Myopia Master, KR-1, and Lenstar, so these tools are not interchangeable. Based on the results from paired t-tests, ICCs, and Pearson correlations, AL measurements were in good agreement between Myopia Master and Lenstar but caution should be exercised due to the wider range of measured values.
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