여러 가지 기기에서의 각막곡률 비교
Comparison of Corneal Curvatures Obtained with Different Devices
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목적: 여러 가지 기기를 이용하여 각막곡률을 측정하고, 유용성을 평가하고자 하였다. 대상과 방법: 전향적 방법으로 35명(70안)을 대상으로 하였다. 자동각막곡률계(RK-F1Ⓡ), 수동각막곡률계(OM-2Ⓡ), 부분결합간섭계(IOL masterⓇ), 파면분석기(KR-1WⓇ), 비디오각막경(Orbscan IIⓇ)을 이용하여 기기당 1안에 3회씩 각막곡률을 측정하였다. 반복성을변동계수, 표준편차와 그룹 내 연관계수 등을 통해 비교하였다. 기기들 간의 비교는 RM-ANOVA on Ranks를 통해 비교하였다. 기기들 사이의 일치도를 측정하기 위해서 Bland-Altman plot을 이용하였다. 결과: 각막곡률측정에 대한 기기별 변동계수는 2.92% (IOL masterⓇ)에서 3.06% (Orbscan IIⓇ)이었고, 그룹 내 상관계수는 0.965(KR-1WⓇ)에서 0.997 (IOL masterⓇ)이었다. 수동각막곡률계와 비교하였을 때, KR-1WⓇ의 각막곡률은 최대 1.23D까지 차이가 났지만,다른 기기들은 0.82D 이내 차이를 보였다. 결론: 각막곡률 측정 시 다섯 가지 기기들 간에 재현성은 서로 비슷했으며 KR-1WⓇ를 이용할 때에는 수동각막곡률계와 1D 이상 차이가 날 수가 있어 주의해야 한다.
Abstract
Purpose: To evaluate device efficacy using the corneal curvature value. Methods: Prospectively, 35 patients (70 eyes) were enrolled in the present study. Three sets of corneal curvature values were obtained using the autorefractor (RK-F1Ⓡ), manual keratometer (OM-2Ⓡ), partial coherence interferometry keratometer (IOL MasterⓇ), wavefront analyzer (KR-1WⓇ), and videokeratography (Orbscan IIⓇ). Repeatability of each device was evaluated by coefficient of variation, standard deviation, and intraclass correlation coefficient. RM-ANOVA on ranks was used to compare the differences in corneal curvatures among the devices. The Bland-Altman plot was performed to assess measurement agreement among the devices. Results: The coefficient of variation values from each device ranged from 2.92% (IOL masterⓇ) to 3.06% (Orbscan IIⓇ),and the values of intraclass correlation coefficient ranged from 0.965 (KR-1WⓇ) to 0.997 (IOL masterⓇ). Compared with the manual keratometer, there was a maximum corneal curvature difference of 1.23 D in KR-1WⓇ, while the other devices had differences less than 0.82 D. Conclusions: When assessing corneal curvature, the repeatability values were similar among the 5 devices, although a difference greater than 1 D was observed when comparing the KR-1WⓇ to the manual keratometer.
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