IOLMaster, Lenstar, Orbscan 및 수동 방법을 이용한 각막윤부직경 비교
Comparison of White-to-White Diameters Measured by IOLMaster, Lenstar, Orbscan, and a Manual Method
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목적: 정상안에서 IOLMasterⓇ, LenstarⓇ, Orbscan IIⓇ와 전안부사진기를 이용한 수동측정법으로 측정한 각막윤부직경을 비교하고 유용성을 평가하고자 하였다. 대상과 방법: 정상안을 가진 31명의 62안을 대상으로 IOLMasterⓇ, LenstarⓇ, Orbscan IIⓇ와 전안부사진기를 이용한 수동측정법으로각각 1안에 3회씩 각막윤부직경을 측정하였다. 반복성은 변동계수를 통해 비교하였다. 측정방법들간의 비교는 ANOVA, Pearson correlation을 이용하였고 측정방법들 사이의 일치도는 Bland Altman plot을 이용하였다. 결과: Orbscan IIⓇ, LenstarⓇ, IOLMasterⓇ 및 전안부사진기를 이용한 수동측정법으로 측정한 각막윤부직경의 평균값은 각각 11.79 ±0.46 mm, 12.05 ± 0.38 mm, 12.15 ± 0.36 mm, 12.30 ± 0.40 mm였으며 검사방법간 유의한 차이가 있었다(ANOVA, p＜0.05). Orbscan IIⓇ를 제외한 다른 측정방법들간에는 강한 양의 상관관계가 있었다(Pearson correlation, r＞0.8, p＜0.05). 변동계수는Orbscan IIⓇ가 LenstarⓇ와 IOLMasterⓇ보다 컸다. 결론: Orbscan IIⓇ으로 측정한 각막윤부직경은 다른 측정법들과 상관관계도 낮고 반복성이 상대적으로 낮으므로 기존의 Orbscan IIⓇ를이용한 측정보다 부분결합간섭계를 이용한 방법이 새로운 기준으로 고려되어야 할 것으로 생각한다.
Abstract
Purpose: To compare and evaluate device efficacy using white-to-white (WTW) diameter measurements by IOLMasterⓇ,LenstarⓇ, Orbscan IIⓇ, and a manual method with anterior segment photographs in normal eyes. Methods: Three sets of WTW diameter measurements were obtained from 62 normal eyes of 31 patients, using the Orbscan IIⓇ, LenstarⓇ, IOLMasterⓇ, and a manual method with anterior segment photographs. Repeatability of each device was evaluated by coefficient of variation. ANOVA and Pearson’s correlation were used to compare the differences among the devices. Bland Altman plot was performed to assess measurement agreement among the devices. Results: The mean WTW distance was 11.79 ± 0.46 mm with Orbscan IIⓇ, 12.05 ± 0.38 mm with LenstarⓇ, 12.15 ± 0.36mm with IOLMasterⓇ, and 12.30 ± 0.40 mm with a manual method. There were significant differences in the results among the methods (ANOVA, p < 0.05). There were significant correlations between the devices except Orbscan IIⓇ (Pearson’s correlation, r > 0.8, p < 0.05). The coefficient of variation of Orbscan IIⓇ was larger than those of LenstarⓇ and IOLMasterⓇ. Conclusions: The WTW measurement using Orbscan IIⓇ has low correlations with other devices and lower repeatability. Our findings suggest that partial coherence interferometry should be considered as a new standard.
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