저간섭성반사계와 부분결합간섭계를 이용한 안구생체계측과 백내장 수술 후 굴절력 예측의 비교
Comparison of Ocular Biometry and Postoperative Refraction in Cataract Patients Between Lenstar® and IOL Master®
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초록
목적: 저간섭성반사계(Lenstar LS900Ⓡ)를 이용하여 백내장안에서 측정한 안축장, 전방깊이, 각막굴절률을 기존 장비들과 비교하고,백내장 수술 후 굴절률 예측의 정확성을 알아보고자 하였다. 대상과 방법: 단일 술자에게 백내장 수술을 시행 받은 32명 32안을 대상으로 저간섭성반사계, 부분결합간섭계, 초음파를 이용하여 안축장, 전방깊이, 각막굴절률을 측정하였다. 인공수정체의 도수결정은 SRK/T 공식을 이용했으며, 예측오차는 최종굴절력에서 예상굴절력을 뺀 차이로 구하였다. 결과: 저간섭성반사계, 부분결합간섭계, 초음파에서 안축장 측정치는 통계적으로 유의한 차이가 없었으며(p＞0.05) 높은 상관관계를갖는 것으로 나타났다. 저간섭성반사계, 부분결합간섭계에서 전방깊이와 각막굴절률은 통계적으로 유의한 차이는 없었으며Bland-Altman plot상 높은 일치율을 보였다. 저간섭성반사계와 비교한 부분결합간섭계와 초음파에서의 절대값 예측오차의 평균은 통계적으로 유의한 차이가 없었다. 결론: 저간섭성반사계를 이용한 안구생체계측 측정치는 부분결합간섭계, 초음파와 높은 일치도를 보였으며, 비교적 정확하게 인공수정체 도수 예측이 가능하였다.
Abstract
Purpose: To compare axial length, anterior chamber depth, and keratometric measurements of an optical low-coherence reflectometry device with those of other ocular biometry devices and evaluate the accuracy of predicting postoperative refraction. Methods: A total of 32 eyes in 32 patients who received cataract surgery were included in the present study. The axial length, anterior chamber depth, and keratometry were measured by optical low-coherence reflectometry (Lenstar LS900®), partial coherence interferometry (IOL master®), and ultrasound. The SRK/T formula was used to calculate IOL power, and predictive error that subtracts predictive refraction from postoperative refraction was compared among ocular biometry devices. Results: Axial length, anterior chamber depth, and keratometry had a strong correlation and demonstrated no statistically significant differences between Lenstar LS900® and other devices. The Bland–Altman plots showed a high degree of agreement between Lenstar LS900® and other devices. The mean absolute prediction errors in Lenstar LS900® and IOL master® were not significantly different. Conclusions: The ocular biometric measurements and prediction of postoperative refraction using Lenstar LS900® were as accurate as IOL master® and ultrasound.
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